Rx8 Upgrade
 

Hi guys i own a 04 rx8 gt auto but the top speed is 130 it tops out and i was trying to figure out how to increase that .

ps i am a new guy here and new to this rx8 :banghead:

So you're doing alot of high speed track driving right?

130MPH is pretty fast..

Best way to increase your top speed is by increasing your horsepower (getting a turbo + nos.)

You'll have like 450RWHP if you pick the right combo, and your engine will last about a week (if that).

your speedo is lying to you.. the auto tops out at 125. get a gps..

it is limited to 125. what tires do you have on the car..

beers :beer:

my car is stock so i have not yet met any upgrades

the tires i am using are the original 18 in ones

and i dont want to go all that way just some minor upgrades like cold air intake n exhaust but i am afraid of getting all that if i am gonna be getting me to 125 like swoope says i wanna go fasssssttttt but not to fast lol

what size are the tires? it would be something like 225 / 45 / 18. so you have a grand touring auto?

so your 04 is stock? has the tires that came on the car?

beers :beer:

i dont know much about the auto's but if your PCM limited to 125, because its an auto, then the only way to break that limit is to reflash the PCM i would think...?

were can i get that item

Cobb AcessPORT, you can get it from Mazdamaniac. there are a couple threads dedicated to it. There is also Hymee's flash tuner that i think is being sold now? I believe Pettit Racing also has flash tune capability of some sort that they offer for NA cars....

i think the accessport will do it. get it from mazdamaniac..

but i am sure someone with an auto will chime in here.. but for the most part on autos or manuals the hp increases with out fi are slim...

beers :beer:

Also, before you do anything to do with your engine management.. Please read up on some information on rotary engines, and just generally look around the forum for technical information... Could save you alot of money.

^^yep. i think the most you can expect with any combination of imaginable bolt ons is ~210(up from the 180 avg dyno)

would this void warranty of my car

i know this is off the subject but i had take my 8 to mazda dealership and they told me the ignition was messed up and my acceleration was not working properly that it was not putting all the horses so they suggested to keep it for a week for a new engine installation, they told me that mazda was fixing all the bugs for all the o4 models

Mazda would definitely claim your warranty is voided. Are they installing a new engine for you? If so, don't bother messing with your flash.

indeed they would take the warrantee for messing with the PCM. But how would they know? theres no way for them to check for that.

thx well they told me if ur gonna put new performance parts to put mazdaspeed parts yea something bout my engine is wrong so they have to put a new one hell how long thas gonna take =(

there is no mazdaspeed anything for tuning.

again, there is no way for them to detect that you have reflashed your PCM

i dont know how long an engine replacement will take them? ask your dealer?

um well there offered me a cold air intake and i have a catalog that show me all the mazdaspeed parts and i am not telling u ur wrong or anything i just have proof

lolz that was a good laugh... everyone here knows what MazdaSpeed offers for parts, they are availible everywhere and at every dealer.

i said they offer nothing for "tuning" as in engine management, which is what we were talking about previously...

Cold air intake doesn't equal higher top speed...

Tuning doesn't equal modding...

Read the forum abit before posting....

Maybe Paul should have said "there are no MazdaSpeed bits that will make the car faster" and then that would include the intake.

S

what Stealth said ^^^


thanks :)

Durr, I thought with MS exhaust+intake you'd have +40 HP to the WHEELZ?!

add a sticker an you got another 20+

but that still wont get you past that speed limiter in the PCM. for that you need a GT wing

Oh, really? I didn't know the GT Wing changed that.. Wow thanks paul! Now I know what to do, screw the supercharger, I'm going to get THIS!

http://img212.imageshack.us/img212/8...rufrearpw1.jpg

dude that wing isnt worth 20... its worth like 75 at LEAST!@!@

lmao, I had that on my 8 but it gave me too much power. I kept pulling the front end up so it had to come off.

i think you needed a big brke kit to stop that from happeneing

Wow, that looks like a surfboard. Thanks Paul for the clarification about dealers not being able to detect a new flash.

I haven't seen anything in my AP or Streetuner software for it that would enable me to limit / unlimit my top speed. As far as I know for US cars this is no such ECU based limit.

JDM has a speed limiter, but there's a bolt-on ECU piggy-back thingy that defeats it.

Someone go get Jeff!

The automatic transmission versions do have a limiter. Manual transmission versions are only limited by aero drag.
The AP can limit speed if so desired. There is a Valet setting that does such a thing. Whether that is available from MM or Cobb, I don't remember.

ShellDude would be MUCH more qualified to listen to here... as i know nothing about the AT's, so thanks shell :)

i was just working on the assumption that you were limited from what i read

You can definitely adjust your rev limit so perhaps that's the confusing part.

Out of the box the 4AT is limited to 7500 RPM, but with an AP you can raise it as high as you like.

The whole speed limiter thing is real for JDM based 8s, but like I said, I've yet to see anything concrete (nor I have tried) that limits / cuts the throttle on my little 4AT.

With that said, I've yet to take it much over 100. 125+ would require a track, no doubt.

get VTAC!!!! YOOOO

I can't imagine cruising my little 4AT at 7500+ RPM in 4th gear. It's 70-75 mph at 3200...

so if the limiter is rev based, you're talking some crazy speed of like 150mph.

Wow, I thought my wing was pretty awesome, but that one is SWEET! Add in some Mazdaspeed nawz and that pesky 125 limiter will be blown away!

damn I was hoping to get into the 130mph club at the salt flats this year. I guess my 04 auto wont be getting there :(

Clearly, you didn't read the entire thread.

^naaaazzzzz

I thought I read that they were topped at 125? did I miss something?

There is nothing in any of the ECU programming, at least the maps provided by COBB, I've found that suggests there is an actual speed limiter on the 4ATs.

The only thing that has been confirmed for the US 4ATs is that they have a 7500 RPM rev limit that can be increased to whatever value you feel like pushing it to.

My engine replacement took a little over a month and i had to pay out of pocket for it (8000 big ones) and slap on another 1500 for a rental car.

Ummm, bigger wheels so the PCM only thinks you're doing 125 :)

lol i did not have 2 pay anything for my new engine replacement cuz of my warranty so i am saving 6000 =)

8000 for engine replacement?

$7,800 and change .

Yeah that seems really high, you can get a pretty beefed up engine from Mazmart and have the prestige of telling everyone Rick Engilman built it, for that much, it is however Mazda you sourced the engine from...

figured I'd put the final nail in this speed limiter coffin. I found this callout from Jeff in another thread that convienently confirms what I've been spewing in this thread:

This was a direct reply to someone with a US 05 4AT considering an AccessPort.