MazdaManiac

iTrader: (3)

I travel!

mdw1000

Did he break a 4-speed tranny or the six speed automatic? Seems that the 4AT tranny has been one with the least amount of problems with the tranny itself. (knock on wood).

mdw1000

out of all the RX-8 transmissions, I mean. I haven't heard of any tranny specific problems with either of the automatics.

laulongfei

Well he told me its a 4-speed tranny(unfortunately), He said that he wasn't running in a high boost, he have her wife use it as a daily driven car. I really wish that tranny thing he said is untrue because I really want to install a turbo in my car and that's the reason stopping me from installing it. Please Help!

mdw1000

I know 09Factor has been running a turbo on his 4AT for quite awhile. Phil has been running a SC on his for quite awhile.

09Factor

I know at one point I mentioned that he cracked the flex plate, (the auto equiv to the flywheel). but other than that, IDK. That was over a year ago.
I know Phil has been harder on his trans than mine. Just because his is driven more.

MM travels and has had ample time to blow up an auto between Phil and myself, but for some reason hasn't. It could just be the magic he brings with him.

G-Gray dude

iTrader: (1)

i talked to paul from Rotorsport ( a shop in santa clara, ca). he is willing to do if for me.

laulongfei

You think Rotorsport will do fine? I know install a turbo on MT rx8 is easy, But on AT rx8 lots computer tuning require.

freaklinkmusic

i have a 6port automatic rx8.. these are my recommendations when turbocharging (this is what I will do)

Cobbs AP-I will change my rev limit to 8700 rpm, therefore i will need transmission coolers.

I have dynoed my automatic bone stock rx8. at 7500 rpm it makes 158 whp. Thats real real close to what the manual does at 7500. Generally the Renesis makes more and more power until about 8500-8700 rpm. So theoretically I will be real close to the peak hp of the manual rx-8 IF MY TRANSMISSION CAN HANDLE IT, when I switch my rev limit.

I will be installing a T3/T4 turbo. I've never heard of or seen an rx-8 with a T3/T4 turbo. I've seen plain T4's (PTP turbo kit). But the T3/T4 has a faster spool up time, helping the car's 0-60 ALOT, being that the auto can only launch at about 2500 rpm. I just hope and pray that the transmission can handle the power.

what are ya'lls thoughts about this?

laulongfei

Thanks for sharing it is really helpful to know, I think its safe just have strong boost under 4000rpm when it pass 4000rpm have the cpu lower the boost, because that is when RX8 high rev power comes in, we are basically just need stop and go power, we just need power under 4krpm. That will make the tranny less stress I think, and scramble boost will be nice dont ya think?

tntmst

Freaklink! I see you made it to the forum.

I emailed you a while back asking about your manifold choice. How is your turbo project going?

Phil's 8

iTrader: (3)

The four speed a/t tranny is stronger than you would think - mine has be subject to 9000 rpm and constant shifting at 8000+ rpm. In conjunction with the AP it is still working very well.

laulongfei

Hey Phil, Do you think maybe Supercharger are maybe less harm to the tranny? because you are having supercharger or you think they both are the same?
Thanks

Phil's 8

iTrader: (3)

Boost is boost - the trans or engine does not care where it comes from. Will I eventually need a new trans? You bet I will but not now or in the near future. Most likely not a new trans but rebuild and beef up.

freaklinkmusic

Did Cobbs AP also turn off the speed limiter on the car?? if so how fast how you gotten the car up to?

MazdaManiac

iTrader: (3)

American-spec cars don't have a speed limiter.
At least the '04s don't.

freaklinkmusic

I was going to use the obx headers at the manifold.. but I changed my mind. I'm going to use PTP's turbo mainfold. Thats who's hooking up my turbo from
Austin, TX. Im also getting the Pettit Racing intake mainfold. They said they would sell me one for $400

freaklinkmusic

my 2006-6speed auto shuts off at 125mph

silviacon

My 06 auto also shuts off at the same time...

09Factor

The 04 doesn't have a speed limiter. Or should I say mine goes past 125 mph.

Edit:
Caption for MM's avatar,

Mmmm Cherry Chapstick.

G-Gray dude

iTrader: (1)

paul from rotorsport had worked on bunch of rx8's. he used to own a rotary engine car i dun know which one. and my AT engine is the same engine with MTs, so it should make the installation the same with if you would to drop the turbo into MT's. part of the problem like you said maybe tuning.

laulongfei

Hmm....My 4speed have speed limiter

Phil's 8

iTrader: (3)

I can't speek for every a/t but mine never had a speed limiter as I had mine before the s/c to 135 +/- speedometer correction. You would have to ask MM if it turns off the speedlimiter, if yours has one. It does turn off the forced shift points of an a/t and lets you go to your new redline (& beyond) so use caution when/if you pruchase an AP. You can of course blow the whole mess if you go beyond a certain point (?). I just set my personal limit at 9000 and everything has held together. Since the addition of the AP the whole combo runs smoother.

G-Gray dude

iTrader: (1)

is it just me or somebody else. it seems that my AP did not raise my redline at all.

Jedi54

iTrader: (7)

I don't think the AP increases redline on all tunes. You can ask Jeff to increase it but ask yourself if you really need / want that...