DOMINION

Yup. I can hit like 0-60 in 1/2 that time when I'm going down hill lol

04blue-8

I really don't think the baseline is 118whp. My spec V stock was 152whp or so and the accelleration felt similir to my AT rx-8. It was faster but not by much.

rx8-8888

haha, i think some1 is just trying to sell something, or some1 really bought a rx-8 shell + chasis and put on a Toyota Vios engine. ha ha. say what you like, i do my dyno very often. and i havent been smoking ****, but i think the dyno machine who did 118rwhp smoked some good ****.

sosonic

Yeah, something is really, really wrong when you get an RX-8 with a dyno of 118. 130 to 160 range rwhp seems about right for stock. The 4port AT is rated around 195 HP (in the U.S.) and around 210 HP or better (overseas or after ECU). You just are not going to lose that much power in whp, unless that particular RX-8 Auto is beat to hell or something is really wrong.

Be that as it may, in the stock RX-8 Auto's I've seen 0-60 times between 8 to 10 seconds on 4 ports ( there seems to be a large variation). I tested them with a G-Timer and times depend on the mods.

The killer in 0-60 times is defintely the rev limiter and torque converter (prevents launches above 2,500 RPM). The rev-limit and speed limit (recommend also get AFT cooler if you do this) can be cured with an ECU flash, but the torque converter requires somebody to customize it ( feel free if you have info. on who can do this for RX-8s). The customized torque converter seems necessary if the RX-8 Autos will break into 7s and 6s ( with other mods added ).

Based on the mods posted, an Agency or Unorthodox Pulley may help. This should help 0-60, because it allows your engine to spin up to higher revs faster. Might allow an 4 port Auto RX-8 to get high 7s without supercharger or turbo, provided he has other mods like intake, exhaust, ATF cooler, etc... The Pullery is a cheap mod, and appears to be the next best thing to a customized torque converter, rev-limit cut, and Automatic Transmission Fluid Cooler.

R888

In my opinion, Turbo or supercharge is a waste of money because there are lots of upgrade needs to be done, etc, Supension, injectors and so...

You never know what u need next when the problems comes out after modification.

I guess inter-X is the final step for my automatic rx8 4 speed. Let the 150whp be it.

I read the previous post from the auto dyno without inter-X, how the heck was that true the stock dyno @ 120 whp around. I can confirm it now, its true! I recently have a chance to see the difference with a stock Mazda 3. Rolling start was the same but red light and starting in result got smoked.

If I have 5k to go, I traded in for manual!

sosonic

This test seem really off.

1. Was this a 4AT or a 6AT? The 6AT should obviously fair better. They have the same engine as the 6MT, so despite MT prejudice, it has the same overall potential minus the transmission.

2. A base line of 118whp is extremely low for RX-8 ATs which are rated at 197HP to 215HP (depending on country and if 6AT or 4AT). 118whp would be equal to something like 140HP at the crank.

Mazda could easily be sued for saying a 140HP car was ~200HP. That is not in the range of statistical error or dyno difference but an outright lie. However, what I've seen of the ATs shows different.

Even 150whp would be like ~180HP at the crank, again this is something an AT should be already getting unless there was something wrong.

An RX-8 AT, without mods, should be testing around ~160whp. This would put it in the ~200HP range at the crank and make sense.

I have a 4AT w/ Re-Amemiya ECU flash, Odula Air Duct, ATF Cooler, R-Magic Exhaust... waiting on that AP pulley... Anyway, I'm showing ~210 to ~215 HP on my G-Timer (have calculated weight, etc....) That should be around ~170whp. I was showing ~195HP to ~200HP on the G-Timer when I first bought it. Even if you argue with G-Timer or G-Tech HP ratings, I've still pulled high 7s 0-60 times (the only killer is the 2,500RPM launch limit of the torque converter unless I do a neutral slam). A moderate neutral slam start on my Auto (~4,000RPM) would give low 7s and just maybe high 6s if I really push it at ~6,000RPM launches (but I'm not trying to kill my auto tranny yet)... This is still consistent with ~200 HP for a car of our weight.

Going FI is very do-able for me and I expect the situation to only improve with a supercharger.

+50HP gains or better from a Pettit stage 2 would put me at ~220whp and ~275HP at the crank. Might even get some more...

Also, there is an RX-8 Auto w/ Pettit SC that appears to be making ~210whp with an "beta" version of the Pettit SC kit.

RX-Auto AT performance can be improved. 275HP to 325HP at the crank is achievable.

An 300whp RX-8 is all what many RX-8 owners want anyway. Trying to pull 400whp would require a whole series of major upgrades beyond just the FI for even MT owners.

R888

NO kidding, 4 speed AT stock vs auto Mazda 3!! The 3 has no exhaust but with stock cat! While the 8 has aftermarket exhaust and all stock!

I kinda of argue if the stock 3 has 160hp then I presume 120whp on it. It was a hot day btw.

sosonic

Yeah, but 1 specific RX-8 AT getting smoked at a stoplight, does not condemn all RX-8 ATs. You should not judge all RX-8s by such a method.

Also-

1. How do you know the Mazda 3 was all stock. Dude is running around with no exhaust???

2. Driver, driver, driver, driver... Does he know what he is doing? Was it in manual mode? Was he just slow to get the signal to start?

3. Hot day? Heat soaked engine? Or is this some RX-8 guy that has dogged his RX-8 and now it performs like a beaten sweaty mutt?

4. A Mazdaspeed 3 could smoke an RX-8 MT at a stoplight, depending on the driver. Are you sure it was a Mazda 3 and not a MS3?

Atilla

iTrader: (1)

1 question. Was the AT a 4spd or a 6spd? I would imagine the 6spd puts out more than 118 no???

fc13b-re

nothing sounds right about this....ive been in too many cars with varying ranges of horsepower and i now own an 05 auto and I can feel more than 118whp in the "butt" dyno, and ive personally seen older 4port rx7's do more than 118whp, and if your trying to tell us the new renesis design on the 4port cant make more than the older design well thats just crazy.....

stop drag racing your 8's lol

Atilla

iTrader: (1)

Bump - sorry to bring this thread back up but I'm looking to pick up the Inter-x in july and i wanna get an idea of what i'm gonna be looking at.

I'm gonna go on a limb here and assume that the 05' 8 that was dyno'd with the inter-x was a 4spd -

What i wanna know is - since the results on dyno proved to grant the 118 whps rx8 an extra ~30 pony's - would it be safe to assume the same amount would be granted to the 6spd's with the same mod's and how much horsepower will i be looking at then? around 180?? anybody know?? - Sorry if this is a repost but after sitting here trying to search it thru the search buttons i haven't really accurately answered my question - i just wanna know how much horsepower the 6spd AT has so i can start getting a general idea of how much i'll be getting if i purchase certain parts in the near future-

DMRH

Interesting read this.

Just did a dyno run on my 03 model today.

Its a 4AT & is basically stock. (exhaust, CAI etc are coming soon)

Scored 90KW at wheels using 2nd gear as 3rd gear maxed out over 200km/h or more than the dyno was rated (122 19th century horse power)

Friend has a 4-port 13B-MSP powered 5-speed & scored 100KW so a 10KW loss for the auto tranny seems fair I think

Was told this is normal for a 4AT version.

REgards

tajabaho1

hmm, I highly doubt all the ATs are that slow, but I'm not gonna say al the reasons, Sosonic already did that for me,

however, nice info on the int-x I think I would get that @.@

Zero_Rotary

i wonder those ATs dynoed were using the original 16inch rim?
I ever tried an AT before with 16inch rim and it felt faster than those using 18inch rim

tajabaho1

actually, you're right, 16 inch rims does feel faster, but its much heavier than the rims I have on right now

Phil's 8

iTrader: (3)

There are several threads in several forums talking about dyno results for the 8. No two similar 8s seem to dyno the same. I had my runs on a dyno when setting up the X and there was no consistency. Other 8s similarly equipped at that time were also not consistent. Dyno results mean nothing to those of us that do not race. How does your car perform for you? You are unhappy with it's performance? There are several ways to improve the a/t performance. Some should quit telling others to avoid the a/t, trying to figure a dyno run, worry about wheel size and just improve the performance or trade it in for something else.

DOMINION

I'm with Phil on this one.

R888

Phil's

hows your SC so far?

Any dyno?

The tranny has been upgraded?

Phil's 8

iTrader: (3)

I'm ecstatic with the performance but one small mod propagates other mods. Ray will be installing the new custom radiator just before SSX and Jeff will complete the tuning about the same time.- No dyno, if you had read this thread you would have seen that I do not put much faith or credence with dyno results for street use. - The added torque and power seem to be a strain on the a/t and will need attention, but after SSX.

Atilla

iTrader: (1)

Hey phil, you mention strain on the tranny - honestly i want to go fi with my AT some time in the near future and i was really concerned about that. I also believe i read some where you may be adding something to help with the strain - care to give some spoilers??

tajabaho1

^ me second that

sosonic

My thoughts, but remember I'm not a pro-mechanic or tuner, was that consistency was related to the "oil return line" to the intake or the RX-8 ignition system. Oil return line to intake = send old oily vapor as oppose to fresh air into the intake. So sometimes you get better responses than other times when attempting to accelerate. Ignition system = a range of problems where you are not burning the fuel to max capability.

Reference-

https://www.rx8club.com/showthread.p...light=breather

http://www.rx7store.net/category_s/313.htm

https://www.rx8club.com/showthread.p...ignition+coils


I agree with Phil that this anti-a/t stuff is silly. Your satisfaction is relative to the individual. RX-8 Auto performance can also be improved, if a person wants more, as well.

Phil's 8

iTrader: (3)

Wait untill after SSX on any news about the a/t. Paradox Performance, some very savy a/t people will be doing some tests. Why would you wait for FI? My s/c only stresses the a/t when I push it hard and carry the shifting beyond normal ranges (can't speek for turbos). During normal "spirited" driving there is not a noticable strain. My problem is that if the engine is good for 9000 RPM then why do I have to shift at 7000.

Clavius

I've always stated this and said it on numerous threads. My belief is that our trannies can handle the 9k rev limit but can't do so for long periods of time. By this I mean say in theory a tranny is supposed to last 200k miles, Mazda realized that if they set the rev limit to 9k our tranny would only last 150k or less. For the sake of wear and tear they figured to keep the limit to 7k to ensure long life out of the tranny. (I've just woken up so my thoughts arent fully together hope I make sence here haha.....). Though I do admit that since this transmission has been around for awhile that there isnt that many upgrades for it be it for higher HP or Rev's or well much of anything for it. If Charles and his crew have some idea's that work wonders they could be coming into a small cash cow.

Phil's 8

iTrader: (3)

Note my use of the word "tests". It is not yet known if any substantial improvements can be made but ya never know unless you try. I am not a part of Paradox Performance so I can not speak for them. I started the investigation and found that Ray and others were very interested - Nothing will be done until after SSX. At this time I am not interested if the a/t only lasts 150K I want to be able to shift at a higher RPM than is now available. I realize that 9000 is most likely a pipe dream but I am still making substantial power to about 8200-8500 RPM. Presently it does not want to shift at that high a RPM. So far the only thing I have found out for sure is that the 7 a/t and the 8 a/t are not the same internally. The only things that can come to pass will be an improved 8 a/t, me waisting my money and/or Paradox Performance (and others) waisting their time. I'm just inquiring body asking "why not?"