Originally Posted by teflon_jones

It's interesting how much conflicting information there is on this topic on the interweb. Most of what you find says the only top speed limiter is due to the fuel cut at 196 MPH because the engine reaches the RPM limiter and it cuts the fuel. However, there are a couple of reliable sources (including another tuner I won't name in respect for Markski posting the answer on this thread) that talk about removing the top speed limiter separately from the RPM limiter.

In either case, the limiter is achieved through fuel cut.

Originally Posted by teflon_jones

It's interesting how much conflicting

In either case, the limiter is achieved through fuel cut.

Originally Posted by cosworth

Hi WINNI ,NO Nobody other Tuner!.. raised rev limiter to 7500 was done directly by RsTuning after my specific request to have much usable low gears and much top end speed (Unfortunatly top speed is not increase here is the problem)..Yes They told me about the risks and that they raise to 7500 but without any warranty.
Yes i can rev my car to 7400 - 7500 in all gears 1st ,2,3,4,5th but NOT in 6th where at about 6950 rpms something wrong happens and speed NOT increase..
I'm interest in your idea about boost leak or coils problems but i ask to me why this problem appear only in 6th gear..
The engine load is not to much different from 5th gear to 6th gear but in 5th all is ok and rev to 7400-7500 , while in 6th it stops to 6950.
My boost is 1.1 bar dropping to 1.0 after 7200 rpm , i don't think a boost leak because boost stay to 1.0 -1.1 also in 6th gear when speed stops to 330 km/h /6950 rpm...the problem seems a cut of fuel or maybe ignition (like you say COILS problem) ..but why only in 6th gear and why always exactly at 330 Km/h - 6950 rpm ?

Originally Posted by winnigt2

the normal route is that a tuner change the hex adress from rev limter and that is it....pure and simple ...at the rev limit first throttlebody close and if that is not enough fuel cut and ignition cut follows 80 rpms later ..that values are simple to manage...if your tuner have done you a special present he deviate from this route and go into another map and activate or write a speed limiter...maybe he do that as a safety feature...

for my understanding you dont need 7500rpm in 1-5 ....you only need it at 6.gear....i was told epl has a load dependend rev limit that could make that true....

if your tuner tell you he dont make a speed limit for you validate it with durametric log...throttle value should show you one of the answers...next possible way is load your file up and let it check from the gurus at the forum....

again it is not common that a seperate tabel for speed limit is activated at your ecufile, that is a special present...in that case your tuner know exactly if yes or no....

Originally Posted by johnspeed

HI,,First gear is really where would need the high rev limiter the most because of the gear recovery,spread of the ratio is the most between the 1st to 2nd shift, the rpm will drop the most on the shift to 2nd.
Then I can see it being useful in 6th also for top end runs,,if you motor will take that high RPM load..

Originally Posted by winnigt2

the normal route is that a tuner change the hex adress from rev limter and that is it....pure and simple ...at the rev limit first throttlebody close and if that is not enough fuel cut and ignition cut follows 80 rpms later ..that values are simple to manage...if your tuner have done you a special present he deviate from this route and go into another map and activate or write a speed limiter...maybe he do that as a safety feature...

for my understanding you dont need 7500rpm in 1-3 ....you only need it at 4-6.gear....i was told epl has a load dependend rev limit that could make that true....

if your tuner tell you he dont make a speed limit for you validate it with durametric log...throttle value should show you one of the answers...next possible way is load your file up and let it check from the gurus at the forum....

again it is not common that a seperate tabel for speed limit is activated at your ecufile, that is a special present...in that case your tuner know exactly if yes or no....

Originally Posted by MARKSKI@911tuning

there is a V-max map separate of the other rev limit maps... oem is set to 303.02 Km

Originally Posted by cosworth

Sorry Marksky 303.02 real speed or speedo indicate ?
I ask this because when my TT X50 was stock i hit the 6750 rpm rev limiter (Not speed limiter) at 324 Km/h (speedo indicate)

Originally Posted by cosworth

Hi everyone , anyone know if 996TT , X50 , GT2 stock ECU has a 6th gear speed limiter inside tha map ?
I have a 996 TT X50 with Cargraphic/rs tuning 542 hp kit and my top speed is about 329/331 Km/h speedo indicated at about 6950 rpm ...when i reached this speed / rpm in 6th gear i feel something like a fuel cut (or timing retarded i don't know) like a speed limiter .
Rev limiter was set by Rs tuning at 7000 rpm in this kit , so i thought it was the 7K rev limiter that limit my top speed in 6th gear.
So i asked to Rs tuning to raise rev limiter to 7500 rpm but top speed is still "limited" at 329 - 331 Km/h at 6950 rpm in 6th gear.
I ask them if there is a "top speed limiter" for 6th gear only in the ecu program kit but rs tuning answer was NOT.
So i don't know why i can't reach more that 6950 rpm in 6th gear since before with my old ecu program and 520 hp i saw 341 km/h and bouncing off 7200 rpm rev limiter in 6th gear , i don't know why now with 542 hp i can't see more that 330 Km/h and 6950 rpm in 6th gear.
Anyone have some ideas ?
Thank you very much and sorry for my bad english !

Originally Posted by Terminator

I think that with 542bhp a top speed of about 331km/h (on the speedo) is about right. You simply don't have the power to go faster (drag)..

Originally Posted by cosworth

NOT true , i've hit 341 km/h (speedo) and 7200 rev limiter in 6th gear just with a remap and exhaust ...For 341 km/h /(speedo) is NOT needed a power above 480-500 cranck hp , the only think you need is a raised rev limiter (if in your map is not working a top speed limiter as in mine )..
EVERY 996 TT remapped can hit 341 Km/h (speedo) if it has raised rev limiter...sure you will hit it very slowly but you'll hit 341..
Look at this:
http://www.youtube.com/watch?v=jVrnaWxqoTw
This is a 9ff kit1 (495 cranck hp) just remap an exhaust !