RXeckless

iTrader: (5)

That the next thing I'll try (Stainless Steel Clutch line), mine was in today for 2nd gear, but as usually dealer say there's nothing wrong. The worst part of this is, until it really breaks they will not deal with it.

the1jesster

Just got RP out of mine and no more 3rd to4th grind screw RP dirty basterds

papsareb1

had the 2nd gear replaced in my 06 shinka 6mnths ago under warranty.
2nd gear now with 8000 miles on it has gone out again , dealer attributes
it to abuse and said they will not cover it under warranty.

papsareb1

reading the posts in here , seems to me that we should collectively
file a class action suit. i was told the same thing about my 06 rx8
abuse, aftermarket parts . mazda needs to held responsible for these
defects.

Vlaze

iTrader: (14)

Whelp I may be going backwards contrast to those who love using Redline MT90 as after I replaced stock tranny oil with new Redline MT90 (NS) GL4 oil and this weekend driving it on a 500 mile combined trip to NY and back I get grinding from 3rd to 4th if upshifting anywhere from 7k rpms and higher. Checked this out multiple times testing at what rpms the grind occurred and making sure clutch was pressed fully.

I find it hard to believe it's a synchro or a fork gone bad with no issue whatsoever in relation to grinding until I switched to MT90. After extensive research I've come across a few who've had the same issue using MT90; anyone else have similar problems and if so what oil worked in place?

Vlaze

iTrader: (14)

Well Redline Heavy Shockproof 75w250 may be your hope and savior to lengthen the life of the trans. or rather, delay when it decides to go boom from what I've read. Placing in 75w140 later tonight before a test run. I'll report how it turns out. Although I don't suspect my trans. to be going since I had no issue until the MT-90, going to keep trying heavier or different oils if I have to until it gets back to normal running condition.

L337fpc

iTrader: (4)

i've just developed the 2nd->3rd grind. My 2nd gear syncro is already damaged after 8k mi on reman. It was my clutch pedal being soft under heavy load the f'ed me.

I'm about to order some Redline Heavy Shockproof 75w250 now. hopefully i can get by until i can afford a trans rebuild.

Vlaze

iTrader: (14)

Just going to post here what I did in the other transmission going thread. I went from stock fluids to MT-90 and had grinding issues from 3rd-4th. I tried heavier the next week at 75w-140 and same problem along with grinding from 2nd-4th. So seeing I had no transmission problems until I switched to new fluids, I tried going lighter to MTL (70w-80) the week after running the 140, problem solved and grinding eliminated.

My theory is from extensive reading that I think the MT-90 is slightly thicker than stock fluid. IF you have no grinding issue when switching to a new fluid I would get the MTL if you're gonna get redline. If you are having grinding issues before switching fluids and the transmission is wearing, then try thicker starting at MT-90 in hopes to prolong its life before failure. That's just based on my experience of course, yours may differ.

the1jesster

Been running straight GL4 140 for about 4 months now and made a couple of big trips my problem has been solved for now

the1jesster

I also feel that some synthetic brands are to slick and messing with the syncronizer's

toQDuj

Hi all,

I just bought a 2004 RX-8, and given that it has been in Japan (and still is), it is in remarkable condition. I do get the impression that the dealer did not know so much about car maintenance, so I fear some things may not be properly adjusted and I may be wearing out parts sooner due to this. I want to try and take the car to some tracks nearby, so I need to know if it is in good condition. I worry about one thing in particular, and I was wondering whether people here have experience with that.

Whenever going from neutral into 1st, a slight bump is felt, as if the clutch was not fully engaged. Shifting gear is also rather heavy from 1-2. Additionally, sometimes when f.ex. reversing, an odd smell emerges from the vents. Difficult to diagnose based on these meagre observations, I know, but perhaps someone has some input.

Also I noticed some have replaced their clutchcable with a Mazdaspeed/stainless one. Where can I get this component? Is there an online store or do I ask a dealer or mechanic?

B.

04blue beauty

You have actually purchased one of the rarest cars in the USA, believe it or not. Go to a dealer with it, don't trust a reg. mechanic, RX8s are something most of them will never have seen. If you wish to race and/or autocross, make sure your suspension is healthy as well as your brakes. DO NOT use any syntnetic fluids in your car, they are not good for the Rotary, many probelms have been caused by use of stuff like Royal Purple. mazda has it's own aftermarket parts, Mazdaspeed can be found on the Mazdausa website. there you will find the clutch cable you mentioned. Depending on the # of miles on your beastie, have belts and hoses checked, too. Good luck, let me know how things turn out.

RX8PDX

I have read nothing no where anything to suggest that all synthetics are bad.

There may be a formulation or additive of a few brands that are showing problems, but to blanket all synthetics as bad with absolutely no scientific evidence is just not right. Its down right dishonest.

RP may be causing problems in the trans, but it is fantastic for the engine. To say that many problems have been caused in the rotary from the use of products like RP is a flat out fabrication.

To be more blunt, its bullshit.

04blue beauty

Why have the rotary running smooth with royal purple if raises havoc with the tranny? You can't have the fun desired if one or the other isn't performing up to snuff, so I still maintain it is much better for all involved to stick to the real stuff, no synthetic! 'Nuff said.

Spook_rx8_2007

i havent read past ur post yet but i have been having the same issue.... i had to get a new clutch becuse my other was slipping pretty bad... when i got this done i added royal purple to the trans..... it was good for the week i wasnt hitting it hard then i got use to the clutch and started taking it high on the rpms and i grind usally only when i go past 6 to 6.5k rpms mainly 3 and 4... sometimes also 5 and 6th very annoying.. is the change of oil to blame? i dont wanna drop the tranny again.

Vlaze

iTrader: (14)

Your scenario is a bit different than mine. In my case I had absolutely no issue with the transmission, until I tried MT90. After putting in the new MT90 at 30k miles, I got grinding from 3rd-4th and only those gears, when at 6k+ rpms. After reading how people with grinding went to 75w-140, I tried that..it was even worst. I resorted back to the drawing board and after some thinking, believed that the thicker oil was for those who have worn gears/synchros and found through extensive search that the transmission oil is really closer to Castrol 75w-85 (yes I'm aware of the manual stating 75w-90). I resorted to using Redline MTL (70w-80) after reading about the Castrol and problem solved.

In my case the transmission never had issue, it was solely the switching of the oil that created the problem until a suitable selection was used. In other words I only had one factor in the problem, the oil selection, where your scenario involves a different clutch because the old one was slipping and so forth. Using the same line of thinking that helped me resolve my problem I think yours is the opposite contrast to mine. If your clutch was slipping likely you've worn some of those gears/synchros out more. In other words, I believe going to a thicker oil may be needed for your scenario. The real question is the oil in your transmission the same one from factory never changed? If so, I would propose willing to spend around $60-80 to fix the problem simply by trying new oil. I would start with MT-90 and see if that helps after 2 days on it. If not, then get 75w-140 and try it.

At least that's where my line of thinking goes based on my experience. I hope it helps reduce if not remove the grinding for you, good luck.

icuh8nmy8

nevermind figured it out

RX8.PIPE.DREAMS

iTrader: (1)

I am going to advocate for Redline MT-90 as in my case it did wonders. When I first got the car @ 104.5k miles, I used to grind 5th up shifting and down shifting. But since switching over to MT-90, the upshift grind is gone and downshift is much less problematic, although still present. The fact that the fluid did so much was a really a boon. I had the fluid changed right away when I got the car and the mechanic said there wasn't any pieces of transmission or anything that came out either.

-Chris

toQDuj

Sorry for the late reply.

Well, I am not in America, I am living in Japan. No access to the US mazdaspeed suppliers, therefore. I will ask (with my limited Japanese) a local car mechanic whether he can order parts for me.

Also, maybe it is because of a high level of engineers and scientists here, but there are two RX-8s on our home carpark and one RX-7. I know of at least three other RX-8's at work.. Turns out they are still quite popular here.

If only I could figure out if they have track days on the local cirquit...

p.s. Bought a Scangauge II, which reports no errors, so I am less worried now about clutches and the likes. I did try to test the tightness of the wheelnuts, though, which turned out to be so tight I cannot release them with the supplied wrench..

SEANMAC777

iTrader: (1)

Mine has grinded going into second a little bit ever since I owned it. Now, it is horrible and wont go in above 6500 RPM. It has gotten progressively worse ever since I put my new clutch in.

I did ACT 6 puck and ACT prolite, afe short shifter, and synchro saver all at the same time. Did one of these cause it? Or could it be the fluid they put back in?

Also, I took the shift boot off and exposed the shifter so I could make sure the synchro saver wasnt just keeping me from going into second and noticed that the whole transmission shakes like crazy going down the road. I mean A LOT from side to side.

Is this normal or a bad motor/tranny mount? And could this have something to do with my problem that is ONLY in second?

joejoethedog

ok so i just bought an 09 rx8 a little over a month ago and im starting to think it was a very stupid idea. i got the car for 23000 with 16000 mils from the mazda dealer with a warren. only thing is after having the car only 48hrs!!! it starts to grind realy bad shifting into 5th.. so i take it in they replace the scro in 5th gear and 6th? wtf? 6th? then i have surgery on my ankle which puts me on my *** for 2 weeks.. i finally get behind the wheele 2 weeks ago and instanly feel a difference in A. the shifting B. it starts to pop out of 3rd and 4th gears and C. the acceleration SUCKS! oh.. and does anyone know why an accidental drift would cause the check engin light to come on and read crank shaft sensor. i didnt hit anything just lost complete comtrol did a 360 then stalled out.. that was this morning on the way to the fucken dealer ship. i had advanced auto reset it before i got there. will this code pop up again or was that a one time thing due to the lose of traction?

04blue beauty

SEANMAC777: I would have all mounts checked, sounds like somethings eith er loose or missing. Is more pronounced in lower gears 'cause we're usually accelerating quickly when shifting, so tranny & motor aren't aligned, causing shift iisues. In higher gears, load on motor isn't as extreme, so no shift issues. hope this helps.

04blue beauty

joejoethedog: I'm afraid you either got a very badly abused beastie or a very rare lemon. Did your dealer have access to CARFAX? That would tell you the car's history. Take advantage of your warranty such as it may be, and get it in working order, or get your $$ back and find a healthier one. sorry for your bad experience.

Mr.We$t

iTrader: (1)

I been having an issue with my auto tran! Sone times I'll put it in park and the "AT" light comes on then I'll try and put it in reverse and the car jerks forward and back REALLY hard then when I get it to drive the 0 in the rpm spot does not come on it stays blank then if I give it gas it run really sluggish

I have to turn the car off and turn it back on and everything clears up Its happen 3 times already not sure what's wrong

05 auto 42,00 miles

rXter

Here's my dealeo.

changed trans fluid at 30K. Spent the next 15K miles getting the funky sulfur stink out of the car. Ended up with LubroMoly 75W-90 - smells fine. I noticed a grind 2 to 3 at high RPM shifts (>7k), even with carefully ensuring that the clutch is all the way down. It's gotten worse and so I need to depress clutch, wait for rpms to come down, shift, release clutch. Synchros gone bad?

Thanks