Hey guys, I know this has been posted probably closer to 1000 times now

now don't say repost or other crap like that, I just wanna get stuff cleared, because apparently, you guys haven't cleared it up in like a buncha posts

So basically from what I've read
Redline: The AT's redline is obviously limited because of the transmission, to be more specific, the Torque converter, which cannot take more than 9k RPM, now because my car is a 6 port, I don't know if the same holds true for the 4 ports
but if we do infact get an aftermarket torque converter, our cars should be able to have the redline the same as the MTs, thus, making all 2005 and later ATs the same as the MTs right?

ECU: the AT ecu is pretty much a box full of (besides all the maps and controls) restrictions. we have: Rev limiter, Speed limiter, and ofcourse the neutral slam limiter
from what I've heard, the speed limiter can be fixed with some type of "chip" from HKS which apparently works(need confirmation)
The rev limiter and neutral slam thing will probably need a reflash, now since racing beat does not have a damn reflash for ATs, I want to know is there an easier way to get this than to get INT-X?

Hidden power?: as some people mentioned before, the AT does produce a bit more power than the MTs at specific rpms before we hit redline( I have tested this myself on first gear vs an 05 MT) so basically we make more HP than MT at like 6500-7k rpm this however is probably because our engine is probably tuned to be like that so my point being, if this is the case, than if we are able to heighten our redline to the same as the MTs, than in theory, our engines should crank out more whp right?

need discussion

 

NO, you would need a significant difference in power to push more WHP than a MT. Simply because the AT are not as efficient.

 

not really a topic of discussion... the fixes are not out yet or likely to be in the near future...

and the converter to 9k is, well not going to happen for money that one would spend on it..

like the 20b swap for the price of the motor, not that easy.

beers

 

I understand, we're talking theory here

besides, I for one am dumb enough to spend the other 30k that my parents gave me to go buy a porsche to instead mod my rx-8

call me stupid, I'm not driving anymore god damn pistons

 

not the same ?

the answer always is.. if you have enough money you can do anything you want..

life is kinda sad like that..

knowledge will close the gap a lot..

beers

 

yea but the reason I made this thread is because I want to know the theoratical outcome so I can mentally prepare myself, not do all the crap then be sad about it later.......thanks though

 

All 8s have a redline at 9000 rpm. As has been pointed out previously, the engine would most likely rev beyond 9000RPM for both the m/t & a/t but the axillary equipment such as the alternator will not. Both the 6 a/t & 4 a/t also have the torque converter that is also a limiting factor. A 6 port motor is the same if it's in an a/t or an m/t. There is no change in the efficiency of the motor just in the efficiency of the axillary equipment.

 

I'd like confirmation of this too, I've looked around and only found info for the M/T, but I saw the Auto version from HKS the other day. Anyone?

 

Could'nt find the thread but there is a member here going 9000rpm AT with some engine mods but no trans mods yet.

 

Think he has that HKS chip?

 

The 4 port AT might have trouble at 9k (long term), even if you worked around all the other issues, like airflow, torque converter, etc. The 4 port doesn't have as many support bearings as the 6 port (something I read here a while ago). I'd be happy with 8k. Likely, you could make it breathe well enough to make usable power up there, and longevity shouldn't be seriously compromised.

The 6 port...well, you have it easy (easier) there.

 

I see, well, I just installed intake and exhaust, so while at it, I decided to pull my friend's ECU (05 MT) and switch it with mine(thanks to rx8club.com DIY) anyhow, it turned out that the MT died using the AT ecu, but mine, apparently worked however a buncha **** were messed up, I took it for a drive in near the garage and there were no beeps at redline and and I hit 8500 rpm for a while, but when I tried hitting 9k rpm, all my electronics shut down and my car died...........won't be doing that again.....

my point is..... so theoratically, if we do overcome the big problems, then the ATs would be able to redline at 9k rpm, but we will onl be as fast as the M/T version, not faster

so the mod that would probably benifit the ATs most would likely be an INT-X or a RE- reflash?

 

When I said that he 6at and the 6mt were the same it did not mean you could exchange your ECUs just that a 6 port engine is the same whether it's in an a/t or a m/t. If you have that much money that you can take the chance of burning up two ECUs then why don't you just trade it in for an m/t and get over trying things like that. I'll just refrain from answering any more of your questions as you do not listen. Maybe some one else would care to try and get thru to you.

 

Why would you want to red line your car? That just makes it run hoter

 

1. Torque converter limits launch speed not overall rev limit. So, the torque converter would not let your car launch from more than 3,000 rpm from a stop. An RX-8 MT could launch from say 5,000 rpm or more, though they are in danger of clutch and transmission issues if they get crazy too.

2. The overall rev limit/speed limit is coming from the ECU. An ECU reflash can remove it. At this time only Japanese Pro-tuners like Re-Amemiya, R-Magic, and Knights Sports will re-flash an RX-8 AT ECU. Since you are in the U.S. you would have to try to e-mail them, deal with language issues, and have to use mail to do the re-flash of your ECU.

You can also wait for the Cobb AccessPORT which would reflash ECUs or use an Int-X.

Note- Yes Racing Beat sucks for not providing an RX-8 AT reflash. It would at least be useful for removing the rev/speed limit and turning on the fans at lower rpm. Plus a slight 10HP gain or so, would still be better than nothing.

Also, Re-flashing your Auto's ECU would allow you to push the Auto Rev-limit to 8,500 or 9,000 rpm (like mine).

3. You want an ATF cooler and to use RedLine (I prefer RedLine High Temp.) or Royal Purple AT fluid. You may also consider Charles upcoming Radiator and ATF cooler that he is developing.

4. If you have a 6 port RX-Auto. Re-flashing the ECU and having an ATF cooler w/ high performance AT fluid would close the gap in performance between the a 6AT and 6MT.

5. An RX-8 Auto has more TORQUE and not more HP. For the same RPM until redline of the Auto, but remember the MT has a higher redline than an NON-flashed ECU on a AT, the Auto would have a TORQUE advantage. But, this is offset by the MT's HP advantage. However, if you narrow the gap of HP advantage, than the Auto's torque advantage may come into play.

6. Because of the torque converter launch limit, around 3,000 rpm, I lean towards a supercharger for the RX-8 Auto.

Hold on... putting on flame suit... The supercharger would not suffer from boost or turbo lag and a twinscrew supercharger would provide higher performance at below 4,000 rpm or dead stops. At the RX-8 torque converter limit of , 2,500 to 3,000 rpm, a twinscrew supercharger would be at FULL BOOST.

However there are turbo anti-lag systems or you can setup the turbo for low rpms, but if a turbo is setup for low rpms than it usually will not do well or be limited in performance at higher rpms (like the Greedy turbo). The best of both worlds still appears to be twin turbo, where one turbo comes alive at low rpms and then the other at a higher rpm (like the old RX-7), but that is a very complicated setup. A twinscrew supercharger would do well from low to high rpms. Also changing the pulley belt would give higher psi and HP gains. Presently the Pettit supercharger is at 6psi. We would see an even greater HP gain at 8psi to 10psi, once that comes out. However, if you want to go past 400Whp with an RX-8 than you would go Mazsport Turbo and other major part upgrads, though many RX-8 owners appear to be going for 300whp and better low end boost (something a twinscrew supercharger could do).

 

NOOO Phill I'm sorry, won't do it again.......I know it was idiotic of me, but curiousity got the better of me,

thanks Sosonic, So Cobb accessport is coming out with a reflash for the AT-8?
and what did u do to your ecu? INT-X?

and how much is an ATF cooler? also.......and yes I do agree with ya, I actually really want the pettit supercharger, but at this price, its just @>@(for the HP gains of an AT rx-8

 

This is interesting.

 

Come on man search!
https://www.rx8club.com/mazsport-104/interceptor-x-review-w-dyno-pics-77450/

 

but I'm too lazy damn it! thanks!

 

Does the 6-port auto actually have more torque than the MT? I know the 4-port auto does, but I thought the 6-port was the same as the MT, just 1500 less rpms (and more drivetrain losses due to the torque converter)?

 

mazda spec sheet says both 6 ports have the same torque peak.

 

I would have got the 6 port if it was out at the same time as the 4. Next car will be a mt mazda.

 

if mazda comes out with a better rx, I'd buy it

 

I think they are doing a redesign for the 2010 model. I wouldn't mind switching for that if it looks any good.

 

better not be a ******* kabura