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Series I AT-Specific Performance Mods Discuss engine and transmission modifications for your AT equipped RX-8

AT owners 4 speed or 6 speed, post your TOP SPEED!

Old 04-12-2007, 07:22 AM
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a gutted boar??? man when i push my car it doesnt sound like that, I'm in 4th or 5th gear (i cant remember which one it is exactly) around 4500 rpm's. and then power just goes down.
Old 04-26-2007, 05:29 PM
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146 6MT - VERY HARD to reproduce...needed a long long straight...cool day...little to no wind...near sea level...
Old 04-26-2007, 06:18 PM
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Originally Posted by tajabaho1
btw......I heard that the 04 AT are all capped at 120......anyone?
Nope, 125mph like the others. 122-123 in 3rd.

----------------
Getting rid of the limiter should be as simple as raising the rev limit, I would think. An ecu capable of taking over fuel injection should do the job. (Is it a fuel or ignition cut, or a throttlebody thing?) Going over 125 seems like a worthless goal if you're not modded heavily (FI) (and on a track). Getting from 125 to 130 will take forever with the .69 4th gear (4AT).
Old 04-27-2007, 02:11 PM
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um, i hit 132 mph in my 04 4-speed on a flat road. i was in the triptronic mode.

-Steakboy
Old 09-01-2008, 04:31 PM
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129mph on a flat road.

05 AT GT

But yea how would I go about taking off the limiter?
Old 09-01-2008, 04:37 PM
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btw it was a track (hahaha)
Old 09-07-2008, 12:56 AM
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Originally Posted by sosonic
I have a 4 speed AT, with rev/speed cut, and have gone above 140 plus mph (225 km/h plus). This is including with a friend in the car (who is crazy too and only the truly crazy should go this fast). So, it can be done.

The only thing that keeps me below 150 mph (240 km/h) is the tire ratings and it would suck to have a tire blowout at that speed.

sosonic, are you stock?
Old 09-07-2008, 03:51 AM
  #58  
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Originally Posted by DexterRX8
06 6sp, 125mph in 4th, but i keep running out of open road.
same here
Old 09-07-2008, 11:54 AM
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i have the 04 AT and ive made it to 130ish with stock ecu.. and for the warranty. it all depends on how good you are with your dealership. ive gone into my dealership and i told them i take it to the track and stuff and tell them i get on it, they are surprised on how well the RX8 performs.
Old 09-09-2008, 01:47 PM
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205 KM/H with my 04 AT but it started raining so I had to slow down... the cars controls really nice at high speeds
Old 09-15-2008, 01:50 PM
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It is true. I maxed out on the thru way at 125. Would not let me accelerate any further. Nobody was on the road.
Old 09-20-2008, 01:37 AM
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im not seeing much of a consistency with the AT 4 ports....hit 125 tonight and shoved my rpms back down along with(obviously) my speed

how can I bypass this?
Old 09-20-2008, 01:57 AM
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125 is the max speed for the 2005 and up. In 2004 they did not have the speed limiter. I know of a person on this forum that has gone 153 in his 2004 AT.
There is NO way to eliminate the speed limitations of the newer '8s.
Old 09-20-2008, 09:58 AM
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Originally Posted by Easy_E1
125 is the max speed for the 2005 and up. In 2004 they did not have the speed limiter. I know of a person on this forum that has gone 153 in his 2004 AT.
There is NO way to eliminate the speed limitations of the newer '8s.
I drive an 04' and im limited at 125
Old 09-21-2008, 05:58 AM
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Originally Posted by Easy_E1
125 is the max speed for the 2005 and up. In 2004 they did not have the speed limiter. I know of a person on this forum that has gone 153 in his 2004 AT.
There is NO way to eliminate the speed limitations of the newer '8s.
Not even with cobb accessport? I have gotten past 125 tho...not by a ton
Old 09-21-2008, 12:28 PM
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Will the speed limit still be there with a piggyback like the Interceptor? I haven't tried 125 yet, but maybe I will at Road America sometime.
Old 09-21-2008, 01:28 PM
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Mazdamaniac's site says it removes the speed limiter, I believe with the cobb or an interceptor you can remove it. I don't know what else will remove it or the rev limiter.
Old 09-21-2008, 02:15 PM
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Does anyone with a Cobb or Int. + AT rx8 have proof of them going over 125?
Old 09-21-2008, 03:51 PM
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^hopefully after sevenstock...i'll be able to let you know
Old 09-22-2008, 06:32 AM
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Originally Posted by SayNoToPistons
Does anyone with a Cobb or Int. + AT rx8 have proof of them going over 125?
What would you consider proof? Since those of us that have done so you would now consider lairs. I have never had a speed limiter. I had shift limiters until the install of the AP and now they have been raised considerably but still there.

Last edited by Phil's 8; 09-22-2008 at 06:39 AM.
Old 09-22-2008, 09:57 AM
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Phil,

We need the data file from the flux capacitor

Only way I can think of to supply any form of "proof" would be to take a picture of the dash when you are doing 150+ at one of your open road races, but I would not recommend that Either that, or give an independent witness a ride during one of your races, but then you might have to hose out the passenger seat
Old 09-22-2008, 10:40 AM
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06 AT- 128mph, flat road and running out f room so I had to slow down.
Old 09-22-2008, 11:00 AM
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4sp 04 - 136mph
Old 09-22-2008, 11:22 AM
  #74  
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Originally Posted by mdw1000
Phil,

We need the data file from the flux capacitor

Only way I can think of to supply any form of "proof" would be to take a picture of the dash when you are doing 150+ at one of your open road races, but I would not recommend that Either that, or give an independent witness a ride during one of your races, but then you might have to hose out the passenger seat
I am not sure you could get anyone to get into the car during the road races let alone take pictures. As a quick overview for those of you that do not know, there are open road races in Nevada where they close off sections of a highway and let you tell them how soon you will be a point B and at what your maximum speed will be during the race. You have to be careful not to exceed your stated speed by more than 10% and not show up early or late to point B. There is no limit to your stated speed (except for safety issues of your ride) or time to arrive you just need to set it and then live by it. I no longer qualify for speeds above 130 due to new safety requirements. Last year there were three RX8s in the race and while none of us finished in the money we all finished. The highway picked always has extended straight sections that are relatively flat, up hill from 3000' to 7000' and back down and usually about 350 to 400 miles in length. You only get one gas stop that you have 5 minutes to complete. Your slowdown time before and after the gas stop comes off your time. Keep in mind also that the whole race happens on open range - bring extra shorts.
Old 09-22-2008, 04:38 PM
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Originally Posted by Phil's 8
What would you consider proof? Since those of us that have done so you would now consider lairs. I have never had a speed limiter. I had shift limiters until the install of the AP and now they have been raised considerably but still there.
I'm not calling anyone a liar. I'm just curious because some are saying this and some are saying that (limiter cannot be removed, limiter CAN be removed by Cobb AP, etc etc).

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