I have heard a lot of people talk about how you should redline your 8 a lot or daily. I did not know if it was just different for the rotary engine because I have never heard or pushing your engine to the limit as a good thing?

well, these guys have had years of experience with rotary and i guess the 8 is the exception to redline being bad. it's certainly because it's rotary and it works very differently from how a traditional piston engine works. i'd take their word and i notice myself the car likes high rpm alot.

I do it daily keeps the carbon buildup away , and plus the car like the stay above the 5k mark

it's not going to harm the engine, but it might hasten damage to your transmission.

my syncros are now shot for 4th gear. When I get my new transmission in, I plan to keep it below 7k for the most part (which is fine because I make almost 300 whp at 7k). The transmission was not designed for this car - it's a modified tranny used in the miata.

i redline my car ATLEAST 8 times a day, drives great

The transmission was not designed for this car - it's a modified tranny used in the miata.

I learned something new! :lol2:

Redlining every once in awhile keeps carbon from building up. Think you just need to redline 2nd gear everyday? Not sure.

But heck what do i knowwww :rolleyes:

Exactly what I've heard, its good for the engine but bad for the tranny!!! Thats why I've been through 12 output seals and mazda won't warranty them anymore! Ugh! So either I redline and screw up my tranny, or don't and screw up my motor!! What to do?

you don't need to redline it to blow out the carbon. 7k is good enough.

and if you turbo it, you can do as much carbon cleaning at 4k as a stock car does at 9 *




*pulling this stat out of my ass based on hp

redlining often, keeps the carbon away... but it does put more stress on the apex seals.. When in doubt redline.

While it is true that the stress on internal components increases exponentially with the RPM in any engine, rotary engines are not nearly as susceptible as a reciprocating engine. Frequent high RPM use can also keep the engine clear of potentially damaging carbon desposits. So I'd guess it's probably more beneficial to redline a Renesis than not, but keep in mind that momentary "once a day" redlines for a second or two aren't sustained long enough to get rid of anything.

redlining often, keeps the carbon away... but it does put more stress on the apex seals.. When in doubt redline.

http://www.rx8club.com/attachment.php?attachmentid=110748&d=1195585834

Exactly what I've heard, its good for the engine but bad for the tranny!!! Thats why I've been through 12 output seals and mazda won't warranty them anymore! Ugh! So either I redline and screw up my tranny, or don't and screw up my motor!! What to do?


Sounds like your stuck in between a rock and a hard place

http://www.rx8club.com/attachment.php?attachmentid=110748&d=1195585834

I love that picture of the apex seals.
Ranks up there with the rabbit/pancake pic

use common sense, all engines need the carbon cleaned out from time to time. The 8 's engine loves high revs. So do the math.

But no need to break the damn thing.

it's not going to harm the engine, but it might hasten damage to your transmission.

my syncros are now shot for 4th gear. When I get my new transmission in, I plan to keep it below 7k for the most part (which is fine because I make almost 300 whp at 7k). The transmission was not designed for this car - it's a modified tranny used in the miata.

Never thought I'd get to say this - that's why you should get an AT :lol2: At least the 4AT tranny is supposed to be very durable (knocking vigourously on wood now...)

…but keep in mind that momentary "once a day" redlines for a second or two aren't sustained long enough to get rid of anything.So, in your opinion, what's the minimum you'd suggest to avoid carbon buildup? Five to 10 seconds @ redline once or twice a day? Twenty or 30 seconds? More than that? And does it have to be at redline? Or is 7 or 8K good enough?

i tend to redline at least once a day.... when not redlining, I usually like driving down the freeway in 4th or 5th gear tops..... around 5k to 6k rpm....plus I like the sound of the Rotary :).......

I've been redlining in 1st and 2nd a few times a day but almost immediately shifting after the beep. But the suggestion here is to keep it at redline for a number of seconds, right? I haven't been doing that. So that's what I should do?

Here's the real deal. I've spent lots and lots of time around (+ or -) 9k rpm over 4 yrs. Hours cumulative time I would imagine. It doesn't hurt the transmission, improper use does. It doesn't hurt the engine, it doesn't hurt the seals...just be warmed up and don't bounce of the fuel cutout. Like other say, some good continuous reving cleans the engine.

My engine/transmission are strong, good compression, no problems and the reason it is is likely because I don't baby it/I don't abuse it either, I just use it like a rotary should be used...in the high rpm ranges whenever you need/want to :) It's one of the main things that make the rotary so much fun :lol:

http://www.rx8club.com/attachment.php?attachmentid=110748&d=1195585834

Classic!

No, it's bad for your engine. It might spin the valves off and break the cams in half.

A Redline a day keeps the Carbon away

Cheers

...

...

+1?

This is a very interesting thread that I have learned a lot from. I didn't know that the tranny is a modified one used from the miata.

Exactly what I've heard, its good for the engine but bad for the tranny!!! Thats why I've been through 12 output seals and mazda won't warranty them anymore! Ugh! So either I redline and screw up my tranny, or don't and screw up my motor!! What to do?

Actually what's causing that issue is not high RPMs but driveline shock - if you redline, then shift hard to get the rear wheel spin "chirp" on the 1-2 shift, it's quite a shock to the driveline and that puts side pressure on that bearing/seal.

Redline, but then don't shift so hard and let the revs fall to the right match before taking out the clutch.

Redlines do no harm to this car. The good they do, is theoretical at best. But I'm more than happy to redline it a couple of times daily!

I think the biggest thing it does is make you like the car more - it firmly attaches my grin every time I do it ...

i love owning this car bacause i can just leave it in a low gear like 2nd and drive around wherever and at whatever rpm it still wont hurt the car and when i have poeple riding with me they always say " man your gonna blow your motor if you keep driving like that" that just makes me smile because i know this car just begs to be driven even harder

would it be okay if you just redline while it's on neutral?? sorry just got my 8 today very excited

Wow...


YESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSsssssssss sssssssg dgdaga omagoomgadgdag after it warms up from a short drive...

i love owning this car bacause i can just leave it in a low gear like 2nd and drive around wherever and at whatever rpm it still wont hurt the car and when i have poeple riding with me they always say " man your gonna blow your motor if you keep driving like that" that just makes me smile because i know this car just begs to be driven even harder

That's just a waste of gas.

Any theory on how throttle position while approaching redline daily, affects carbon buildup? In other words, does a slow build up to 8-9K work as well as a 1/2 or WOT acceleration to redline?

Mysql brings up an interesting point that only 7K is good enough to accomplish carbon cleaning. Any basis to this?

Another question is how the once a day redline affects gas mileage. According to my Scangauge, it doesn't mean all that much. Gas mileage seems to be mostly determined by how spirited and heavy footed the driving was for most of the day compared to a one time WOT carbon cleaning.

wait, stew, so chirping my wheels from 1st to 2nd has given me all these problems??? I mean im clueless, I dont do it alot, but when Im getting on it I redline 1st then shift quick to second, not an abusive power shift, just an aggressive shift usually resulting in a chirp

you don't need to redline it to blow out the carbon. 7k is good enough.

and if you turbo it, you can do as much carbon cleaning at 4k as a stock car does at 9 *

*pulling this stat out of my ass based on hp

Yea...definitely out of your ass on this one. In order for you to blow out the carbon you need to open the third set of ports on the engine. This happens at the 7K RPM range. At 4K you barely just opened the second set so you aren't helping at all.

Why stop at redline? I try to do that AND hit triple digits everyday. It never gets old!

Because unless you own a race track that gets very expensive.

the real question is what in high rpm cleans the engine. Is it the spinning of the components? Is it the air flow? The amount of fuel and the resulting explosion?

Because at 4k I have more of two of these than a NA car, and at 7k unless its the spinning force, I have 1/3rd more

my understanding from one of the other threads was that when the last set of ports open the carbon gets blown off. if you don't redline the carbon builds up on the port and eventually it fails to open properly.

wait, stew, so chirping my wheels from 1st to 2nd has given me all these problems??? I mean im clueless, I dont do it alot, but when Im getting on it I redline 1st then shift quick to second, not an abusive power shift, just an aggressive shift usually resulting in a chirp

Yup - sure does! This is my third Mazda rotary car (albiet the first one in 20 years) having had 1981 and 1984 RX-7s (1st gen) cars prior to this. Not saying there's anything comparable but ... those two cars (when I was much younger and drove much harder) had constant problems with this. I'm much nicer to this car than I ever was those cars.

Basically, what happens when you do that hard shift is what's called "driveline wind up" - it's the same thing that causes axle hop too. Easiest way to imagine it is that the car is trying to pop a wheelie when you slam all that power through the driveline. Since this isn't a bike weighing only 500 lbs with rider, and since the driveline isn't rigidly attached to the overall structure of the car, but is instead suspended under the frame, the hard slam of power (and by the way this also occurs if you dump the clutch at any revs over about 2500 from a standing start) causes the pinion in the differential to "climb down" the ring gear, thus rotating the front of the differential upwards - the pinion is the gear on the end of the driveshaft, and the ring gear is the big round gear in the diff that is at a 90 degree angle to the pinion (making it parallel to the rear wheels). That causes the entire differential to rotate it's front upwards - the amount is quite stunning if you've ever seen this on a high speed camera - as much as an inch or more of rotation - until the restriction of the suspension snaps it back into place and instead causes the wheels to spin.

That rotation of the differential takes it out of line with the rest of the driveline and puts side load on everything in the drivetrain - the output sleeve bearing/seal in the tranny, the u-joints, the input sleeve bearing/seal in the diff, etc. And that load causes those seals to fail.

So, ease up on the hard shifts and that should make stuff last longer.

Sorry for the long-winded answer, but figured you were interested in understanding the phenomenon at play.

BTW, as I said before, axle hop is also causes by driveline wind up - this is caused because the friction between the wheels and the pavement is more than the driveline windup - so in axle hop, the driveline rotates upwards, the suspension catches it, the wheels literally hop off the ground to correct things, and the driveline snaps DOWNWARDS this time as everything over-rotates, the wheels come back down and the cycle starts again. Axle hop is absolute HELL on your driveline.

Stew

Because unless you own a race track that gets very expensive.

Hence gettting tickets - lesson learned

Someone here said redline but try to avoid hitting the fuel cut-off. Is that really important? I usually don't hit the fuel cutoff but it's pretty close and sometimes I do. Is that really bad? How to avoid it? It's a murky territory up there.

Someone here said redline but try to avoid hitting the fuel cut-off. Is that really important? I usually don't hit the fuel cutoff but it's pretty close and sometimes I do. Is that really bad? How to avoid it? It's a murky territory up there.

Good question. I was wondering the same thing. How much different is hitting the fuel cut off as to just hopping off the gas? Is it because the fuel ports open and close a lot while you bounce up against it, or is there something else involved in the fuel cutoff? Something tells me Stew or MM will know for sure. :bowdown:

A rotary engine is perfectly fine to redline and even drive at redline. A piston engine I'd never do it.

wow I just learned a lot from this thread.

1. Don't pop your clutch
2. Burn Carbon above 7K (the third fuel port opens and causes this)
3. Don't shift at high revs, let the revs drop to a lower value (less stress on trans)


Great info, now to try it!

wow I just learned a lot from this thread.

1. Don't pop your clutch - CHECK!
2. Burn Carbon above 7K (the third fuel port opens and causes this) - CHECK!
3. Don't shift at high revs, let the revs drop to a lower value (less stress on trans) - :lol: BETTER RETHINK THIS ONE!

Great info, now to try it!

If you rev to 9K you'll be at what is it? 45, 65, 90 mph in 1st, 2nd, 3rd - and hey! you gota shift at high revs cause that's where you are - right? So what is meant is that as you shift **deliberately and smoothly, but quickly** your revs come down auto magically cause you lift your go pedal briefly, which matches the rev perfectly for your next higher gear. But wait for the revs to drop? Your speed would drop too. No way!

Use the clutch??? Lift off the gas??? whats that?

j/k. I dont power/speed shift this car. That's only for straight line runs. When in the twisties its all about smoothness.

Guess that means if you have a 4-port you only really need to rev to 4K, because I believe the secondary port opens somewhere around 3750 rpm. But what fun would that be?

I've just picked up on the discussion on carbon buildup, so a 7K> acceleration (to redline) is what we should be doing on a adhoc basis.

I appreciate Mazda will never recommend this course of action, and there seems to be a strong case here.....but is there evidence it will improve the performance or engine life long term?

I've just picked up on the discussion on carbon buildup, so a 7K> acceleration (to redline) is what we should be doing on a adhoc basis.

I appreciate Mazda will never recommend this course of action, and there seems to be a strong case here.....but is there evidence it will improve the performance or engine life long term?

Mazda doesn't recommend we redline it? I have some literature in my glove box that states otherwise, in fact. It's called a driver's guide, provided by mazda, and it encourages you to rev it up to redline.
As far as someone else mentioning having just learned to not pop (drop) the clutch... of course that's not good for the tranny... that's true for any car....

I've just picked up on the discussion on carbon buildup, so a 7K> acceleration (to redline) is what we should be doing on a adhoc basis.

I appreciate Mazda will never recommend this course of action, and there seems to be a strong case here.....but is there evidence it will improve the performance or engine life long term?

Other than the injector not getting clogged shut? newp

Guess that means if you have a 4-port you only really need to rev to 4K, because I believe the secondary port opens somewhere around 3750 rpm. But what fun would that be?
Now I'm confused....
one only needs to get to 3750 rpm to open the 4-port and if so does this figure hold ture for both a manual and automatic?

My understanding is the AT is only a 4 port and the MT is a 6 port. So it would be true, for those of you unlucky enough to own an AT. Then again...how do you redline an AT? It isn't like you can stop it from shifting.

nope nope...
04 and 05 at were 4 port, 06 and later are 6 port at models. you can hold any gear in manual mode without it up/down shifting. the at car has a auto/stick combo even though the manual shifting part is not a true manual stick shift (it just lets you hold a gear until you tell the transmission it is ok for it to up shift).

Won't frequent redlining damage the alternator and other accessory systems?

Theres no real evidence of redlining harming the cars electronics. Could be a bit hard on the coils I suppose, but they'll go bad anyways, may as well enjoy em.

Yeah, I go WOT once a drive for carbon deposits, otherwise I redline it just for fun far too often. Engine seems to love it, and with 40 thou it's running stronger than ever.

Theres no real evidence of redlining harming the cars electronics. Could be a bit hard on the coils I suppose, but they'll go bad anyways, may as well enjoy em.

The question is: Is there any real evidence that redlining helps the engine, transmission, driveline, electronics, or any other part of the car? Documented, real evidence? Has Mazda said, "Redline the car once a day to keep the carbon away"? or is this rotary folklore?

Drinking alcohol heavily when you're sick might kill the viruses and bacteria making you ill by raising your blood alcohol content to the point that they can't survive... but the damage caused to the rest of your body will make you sicker if you do that than if you treat it properly. Beating the shit out of your engine might get rid of the carbon build up, but wouldn't just running some injector cleaner through your engine every once in awhile do the same thing, and prevent the damage redlining very frequently is doing to the rest of the car?

There's another thread on this topic currently going on. Plus, this topic has been discussed a ton over the years.

Actually what's causing that issue is not high RPMs but driveline shock -

Exactly. And this is how it happens:

1. rev engine to redline
2. pop clutch
3. release parking brake.


1.3L

The question is: Is there any real evidence that redlining helps the engine, transmission, driveline, electronics, or any other part of the car? Documented, real evidence? Has Mazda said, "Redline the car once a day to keep the carbon away"? or is this rotary folklore? Far as I know, there's nothing from Mazda that says to redline daily. However... the 8 did come with a little "Driving Tips" pamphlet and, if memory serves, in there was something about how the Renesis likes to be revved.

We have photos of 04's with pretty gnarly intakes caused by the oil overflow dumping into the intake manifold. The pathways to the ports that roll open get filled with black, tar like crud which will eventually cause the ports to stop opening correctly. Frequent redlining can keep the ports working longer, but it will not prevent the oil dumping into the manifold in the first place (you'll need a catch can to stop it. Or a newer 8. I know my 07 has the oil overflow vent right next to one of the main intake ports as opposed to behind the airbox).

So yes, There are documented situations where a red line a day (WOT specifically) can keep an engine functioning longer then it would function if you did not. Theres a lot of anecdotal evidence of this sort of behavior as well. Lots of people here have had power problems cleared up by a tank full of fuel system cleaner and some very hard driving.

REDLINE IT! don't listen to someone that says not to i redline my rx7 several times a day and it runs like a champ

First, not sure if I got me webees and wabees mixed up when i posted b4 that the 06/07 is a 6 port instead of a 4 port. Thought I read that somewhere but now not so sure :(

Second, it seems amazing to me the amount of comments saying red lining is a good thing or at least it seems many feel that mazda says to do it. The little booklet that came in my car indicates that the rx8 engine does perform better at high revs and that it is good to buzz the engine. It even indicates that there is a rev limiter to protect the enginge though making such a statement is not, I infer, the same as mazda saying 'go forth and rev your engine to red line often (or every day).

Last, I pretty much give up on figuring out the 2 port, 4 port, when they open and when others open and how it all comes into play so far as carbon build up goes. Just seems to me to be a large black hole that users do down into and post comments about yet at the same time I don't see any sticky thread saying exactly what is true and what is the correct thing to do so far as rpms to run the rx8 at. In the end I figure it is all just everyones option and each does what they figure is best. But no....I don't see where mothership Mazda is telling us that we should red line our cars in order to take correct care of the engine.

Look at it another way. Let's say a good number of people actaully DO redline their rotary engine on a regular basis. Heck, perhaps SOME actually have been know to spend minutes if not cumulative HOURS of time in the rarified upper RPM zones, JUST FOR FUN! But let's say that's only 10% of the people with 8s though.

If there was significant HARM to be done doing this, well it stands to reason there'd be a good number of really pissed off people yelling "I redlined my car! _ The engine BLEW!!"

But there aren't any. I never heard tell of even one person who has managed to redline their 8 to the death. So it can't be so bad, and argeuable it's good (for us or the car).

it's a high performance car. it is ment to be redlined. they expect it to be done often. they probably have done tests to measure the durability of the engine in the upper rpm range for extended periods of time. they dont build high performance cars for them to be driven around like a hyundai accent.

Look at it another way. Let's say a good number of people actaully DO redline their rotary engine on a regular basis. Heck, perhaps SOME actually have been know to spend minutes if not cumulative HOURS of time in the rarified upper RPM zones, JUST FOR FUN! But let's say that's only 10% of the people with 8s though.

If there was significant HARM to be done doing this, well it stands to reason there'd be a good number of really pissed off people yelling "I redlined my car! _ The engine BLEW!!"

But there aren't any. I never heard tell of even one person who has managed to redline their 8 to the death. So it can't be so bad, and argeuable it's good (for us or the car).

then you haven't seen the link to where they put a brick on the gas peadal.

24hrs later she blows.

...Last, I pretty much give up on figuring out the 2 port, 4 port, when they open and when others open and how it all comes into play so far as carbon build up goes. Just seems to me to be a large black hole...

From the book RX-8 by Jack Yamguchi, the diagram on page 115:
all at WOT:
<3750 rpm--ports 1 & 2 open
3750-5500--ports 3 & 4 open
5500-6250--aux intake in front of airbox opens (to reduce intake noise)
6250-7250--ports 5 & 6 open
>7250--Sequential Dynamic Air Intake opens.

Additionally, the 3rd injector for each rotor is employed above 4000 rpm and at WOT.

The purpose of running hi revs is to clean out the carbon, but also to exercise the valves. If you don't move 'em, the regular grime and tar buildup that occurs in an engine will cause the valves to stick shut after a while. One of the ways Mazda tries to combat this for at least ports 5&6 is to flick open those valves when the engine starts; presumably other valves are also treated this way, though in the older rotaries (like my 1991) it was primarily the aux ports (5&6) that got stuck (twice now in mine).

redlining in our cars is good dont be worried.

From the book RX-8 by Jack Yamguchi, the diagram on page 115:
all at WOT:
<3750 rpm--ports 1 & 2 open
3750-5500--ports 3 & 4 open
5500-6250--aux intake in front of airbox opens (to reduce intake noise)
6250-7250--ports 5 & 6 open
>7250--Sequential Dynamic Air Intake opens.

Additionally, the 3rd injector for each rotor is employed above 4000 rpm and at WOT.
ggreen29....
thanks for the input/information. Still not sure if I have a 4 port or 6 port on my 07 auto but based on what you wrote I'm figuring tossing it up to 6250 would do the trick (assuming I have a 6 port).

it's a high performance car. it is ment to be redlined. they expect it to be done often. they probably have done tests to measure the durability of the engine in the upper rpm range for extended periods of time. they dont build high performance cars for them to be driven around like a hyundai accent.

hum...running at upper rpm range, yeap I would buy that since this engine design spins up so well and more power is in the higher range. that fact though would not lead me to feel that they are 'ment to be redlined' or rather maybe not meant to be redlined a heck of a lot of the time.

btw - I'm a newbie and a automatic owner no less so like the other posters said...if 10% of the owners do it and no issues then...ok redlining works and won't hurt the engine (yes I know rev limiter). still, for me, not having to redline the rx8 each day just makes it easier to drive (imho). yes I know, taking the engine up to the red zone is half the fun...and owning a stick rx8 is the other half many might say.

me, i'm happy doing the 3 to 5 (and now) 6250 though mostly below 7k range.
enjoy the ride all

then you haven't seen the link to where they put a brick on the gas peadal.

24hrs later she blows.

:bsflag: Show me!

Haaaaaa haaaaaa 24 hrs on one tank - an 8?? I've seen the RX-7 vid where they ran it wide open til blew . But they drained out all the oil 'cause they knew that's the only way they ever kill it! :lach:

I'd call that MURDER.

:bsflag: Show me!

Haaaaaa haaaaaa 24 hrs on one tank - an 8?? I've seen the RX-7 vid where they ran it wide open til blew . But they drained out all the oil 'cause they knew that's the only way they ever kill it! :lach:

I'd call that MURDER.

I def want to see those two videos!

LINKS PLEASE!

There is this vid... (http://www.youtube.com/watch?v=RhkAz6qossE)

I'm not sure if it the same one either of you are talking about.

While I don't believe that hitting redline is bad for the engine, I also don't think it's the only way to keep carbon out of the engine. A good long Interstate road trip, of a couple of hundred miles, will achieve the same thing. That isn't a possibility for most people so, running to redline is the other option.
I do both.

There is this vid... (http://www.youtube.com/watch?v=RhkAz6qossE)

I'm not sure if it the same one either of you are talking about.

Ugh, that video makes me cry.

There have been numerous threads on the internet with comparisons to "This engine was never redlined at WOT, while this one was." and you could see the insanely noticeable difference in Carbon Buildup. They were both taken care of essentially the same. Oil changes every 3k miles, same oil used, coolant always topped off and clean, premixing with the OMP blocked off. I'd have to say, for me, that's proof enough...and the fact this engine just LOVE the high revs.

i was actually wondering about that the other day. i drive 60 miles a day, 50 are freeway miles at 4k-4.5krpm. i make sure to wot it a few times a day too. but i've been thinking that the constant semi high power has to be cleaning out the carbon as well.

with my last tank of gas i got 21mpg!

There is this vid... (http://www.youtube.com/watch?v=RhkAz6qossE)

I'm not sure if it the same one either of you are talking about.

That's a very odd video. Does it die because all the coolant just boils out the top?

Rules of the rotary #42: Thou shalt not fear the red line. :)

If you won't redline.. There is no point in turning the car on.

i was actually wondering about that the other day. i drive 60 miles a day, 50 are freeway miles at 4k-4.5krpm. i make sure to wot it a few times a day too. but i've been thinking that the constant semi high power has to be cleaning out the carbon as well.

So the point of a once-a-day redline is to prevent the carbon build-up on the last two ports by flicking them open and allowing air to flow through them, right? If they don't open until 6250 and 7250rpms, then I don't see how 4000 - 4500rpm highway driving is going to accomplish this.

Rules of the rotary #42: Thou shalt not fear the red line. :)

Jedi fears the redline.

Mu ha ha...............

Not only do I love the redline, as the revs get up that's when I hear my exhaust belch, burp, and pop. Sounds so cool. Double bonus for redlining. :)

I tend to do it every now again when I pull out onto the highway....just for a few seconds every week won't hurt it.

wait, stew, so chirping my wheels from 1st to 2nd has given me all these problems??? I mean im clueless, I dont do it alot, but when Im getting on it I redline 1st then shift quick to second, not an abusive power shift, just an aggressive shift usually resulting in a chirp


dude I have never chirped my tires in shifting gears. My car doesn't even HAVE traction control equipped, so don't tell me that's the problem. I shift fast and hard enough, but don't get chirping like I do in other cars.

O_o

what the heck?

ggreen29....
thanks for the input/information. Still not sure if I have a 4 port or 6 port on my 07 auto but based on what you wrote I'm figuring tossing it up to 6250 would do the trick (assuming I have a 6 port).

04 and 05 ATs are 4-port. 06 and up are 6-port.

There is this vid... (http://www.youtube.com/watch?v=RhkAz6qossE)

I'm not sure if it the same one either of you are talking about.


The guy who did this to his RX7 doesnt love rotaries or deserve one for that matter. he should be shot.:smoker:

it cant do any harm and it helps alot

Redline brigade, please answer me this simple question, where is credible proof of your theory? Mazda even put a rev limiter (a technical way of saying "this is too much, stop!"). Meaning they knew there are people out there crezzy enough to rev it that far, they are trying to stop them

Redline brigade, please answer me this simple question, where is credible proof of your theory? Mazda even put a rev limiter (a technical way of saying "this is too much, stop!"). Meaning they knew there are people out there crezzy enough to rev it that far, they are trying to stop them

YOU don't have to redline your engine. That's fine by us. Just don't assume that a manufacturer, which has to deal with lawsuits, environmental concerns, and the general stupidity of people, will tell you it's perfectly fine to redline an engine.

Go ahead and don't redline your engine. In fact, go use that 5W-20 that the MNAO manual says to use. Don't premix either, the manual never mentioned that.

Redline brigade, please answer me this simple question, where is credible proof of your theory? Mazda even put a rev limiter (a technical way of saying "this is too much, stop!"). Meaning they knew there are people out there crezzy enough to rev it that far, they are trying to stop them

The rev limiter on the RX8 was installed as a limitation of the transmission and not the rotary engine. While the RX8 in it's stock form can rev to 14K RPMs safely it was found that no measurable gains were delivered past 9K RPMs so the limit was brought down to there. For more information about this argument please read threads related to the removal of the rev limiter via the Cobb AP.

Jindesu, you are creepy, it's like you are reading my mind. I use 5W30 actually, Edge(the dealership put it, i will change it to Magnatec 15w40). I also don't premix. The only things I do are.

1. Fill up with premium
2. Top up with Magnatec
3. Change tyres whenthey are done
4. Wash and polish the car on weekends
5. And I just drive

That, my friend, is how an RX8 is supposed to be. No carbon buildup out of the blue. If you are having carbon buildup, check you oil, premix and all these other fancy mods that people install. You will find the problem and you will sort it out and have a "redline optional" drive like me.

Unfortunately, since the engine uses oil, it will build up carbon. No matter what oil you use, it is a chemical product that does not burn as cleanly as it should. In fact, by premixing with certain additives, that helps clean out some of the carbon - just like adding those fuel cleaners or whatever.

The way the engine works is that it opens its ports at certain RPMS. The two ports that open at the higher RPM are still affected by this carbon buildup. If you don't open them regularly, then eventually the buildup will become so thick that it will never get removed.

Additionally (and I'm not sure if all RX-8's need this), higher RPMs help to clean the trailing spark plugs. Those plugs can become fouled from running your engine at lower RPMs at a long time. That one is caused by the engine not burning as much of the gasoline as it should in the lower RPMs, I believe. Someone can correct me on that if I am wrong.

To re-cap, if your engine burns engine oil, then it will leave carbon (ash). There is no logical reasoning for why it wouldn't leave carbon. Even gasoline has residue when you burn it. Why this affect a rotary engine more than a piston engine (a question you brought up in another thread) is because the rotary engine burns engine oil directly in it's combustion chambers. It just does, carbon will build up, you might last 50k, 80k, 100k with the carbon build up, but it will never last as long as if you red-lined it.

Afternote - I am in no way trying to put you down, my previous post sort of had that tone. I am just saying, manufacturer's do NOT put their product's best interest first. What comes first to the manufacturer is money, legal concerns, and political (environmental) concerns. That is why your manual will not give you these information.

first ahnd experience here i been driving slow lately freaking gas plus i been lazy and been around town a lot and when i went on the highway and felt like crappp like literal crap i hadnt hit redline in like a month i beat the crap out the car stayed a redline and on the return trip from my gf house i got on and felt like new again redline is your friend and i missed that beep so much plus the car is louder my friend noticed i pulled up to his job and said it was louder then the pevious day i saw him and knew i had been beating on it i will say it makes quite a difference when redline is touched

I try to redline everytime I drive it at least once. Even if it is more than once a day.