[Z06] Rev Limiter????
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Rev Limiter????
I just purchased a 2003 Z06 and I seem to hit the rev limiter just before red line, is this normal? I did a search and saw that the limiter happens at 6450 rpm?? is that right? I have had two other c5's and typically the limiter is a factor after red line. I would appreciate any input.
Le Mans Master
Joined: Aug 1999
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From: N Carolina 08 Z51 Coupe
In the first two gears it is quite common to see the tach read lower than redline... The tach gauge is damped and can't swing fast enough in low gears...
Works correctly in the higher gears... check the HUD... it reads correctly..
mike
Works correctly in the higher gears... check the HUD... it reads correctly..
mike
Burning Brakes
Joined: Jun 1999
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From: La Jolla, CA
Originally Posted by SKINVILLE
I just purchased a 2003 Z06 and I seem to hit the rev limiter just before red line, is this normal? I did a search and saw that the limiter happens at 6450 rpm?? is that right? I have had two other c5's and typically the limiter is a factor after red line. I would appreciate any input.
A possible PCM software fix would be to measure the RPM rate of change, and perform a correction based on the rate and filtered RPM (or perhaps use a Kalman or other predictive filter, instead of a simple FIR or IIR as apparently (currently) implemented).
Le Mans Master
Joined: May 2003
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From: USA
Most computer upgrades will allow you to increase the rev limiter RPMs. The engine will start to fall off at about 6,700 RPM, you can feel it and shift. You don't want to consistantly bounce off of a 7,000 RPM rev limiter but you should learn it quickly.
Burning Brakes
Joined: Jun 1999
Posts: 1,028
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From: La Jolla, CA
Stock rev limiter: 6600 RPM
Originally Posted by SKINVILLE
thanks for the responses. so basically my tach is slow to respond but when does the limiter cut fuel, at 6450 rpm?
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From: Bagpipes put the "fun" in "funeral"
redline is 6500rpm, so the limiter will be slightly above that.
1st gear goes by so quick I don't even have time to watch the needle... I just shift by sound, but I've only hit the limiter a couple times.
1st gear goes by so quick I don't even have time to watch the needle... I just shift by sound, but I've only hit the limiter a couple times.
Burning Brakes
Joined: Jun 1999
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From: La Jolla, CA
Originally Posted by johnC5
For WOT or near WOT, try shifting at tach indicated ~6200 in 1st & 2nd, preparing to shift at ~6000.
A possible PCM software fix would be to measure the RPM rate of change, and perform a correction based on the rate and filtered RPM (or perhaps use a Kalman or other predictive filter, instead of a simple FIR or IIR as apparently (currently) implemented).
A possible PCM software fix would be to measure the RPM rate of change, and perform a correction based on the rate and filtered RPM (or perhaps use a Kalman or other predictive filter, instead of a simple FIR or IIR as apparently (currently) implemented).
Thread Starter
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I payed more attention to the tach vs hud yesterday and the hud seems like it is more accurate(never knew there was a shift light). I agree with johnc5 that the analog tach really shouldn't be off considering the electronic technology in the car. 50k for a car to have the tach off just doesn't seem right. this is my third c5 (1st z) and i've never had this problem. it's just an annoyance that i don't want to deal with.
Le Mans Master
Joined: Oct 2000
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From: Oak Harbor WA
Originally Posted by SKINVILLE
it's just an annoyance that i don't want to deal with.
Burning Brakes
Joined: Jun 1999
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From: La Jolla, CA
Originally Posted by SKINVILLE
I payed more attention to the tach vs hud yesterday and the hud seems like it is more accurate(never knew there was a shift light). I agree with johnc5 that the analog tach really shouldn't be off considering the electronic technology in the car. 50k for a car to have the tach off just doesn't seem right. this is my third c5 (1st z) and i've never had this problem. it's just an annoyance that i don't want to deal with.
The simplest fix if you can't see / don't like the HUD message is to use a shift light: http://forums.corvetteforum.com/show...ht=shift+light .
Or shift at around 6200 indicated (start your shift action as the needle sweeps by 6000). Sure, it's a bummer that the tach is not accurate, but the work-around isn't too bad. It would be interesting to know if it's a hardware or software issue (and whether a fix is even possible).