Rev Limiter
Thread Starter
Advanced
Joined: Mar 2010
Posts: 72
Likes: 1
From: West Bloomfield MI
Rev Limiter
I noticed when driving my 08 coupe this past weekend that when I was doing WOT runs the car would reach it's rev limiter, doesn't seem like that would be the norm. The car is a a6 and I leave it in drive while this happens. I have a Vararam installed and Corsa sports exhaust if that would make any difference. Have any of you guys experienced this? Thanks for your input.
Le Mans Master
Joined: Jun 2007
Posts: 7,610
Likes: 12
I noticed when driving my 08 coupe this past weekend that when I was doing WOT runs the car would reach it's rev limiter, doesn't seem like that would be the norm. The car is a a6 and I leave it in drive while this happens. I have a Vararam installed and Corsa sports exhaust if that would make any difference. Have any of you guys experienced this? Thanks for your input.
Pro
Joined: Dec 2009
Posts: 648
Likes: 0
From: Kalamazoo MI
I noticed when driving my 08 coupe this past weekend that when I was doing WOT runs the car would reach it's rev limiter, doesn't seem like that would be the norm. The car is a a6 and I leave it in drive while this happens. I have a Vararam installed and Corsa sports exhaust if that would make any difference. Have any of you guys experienced this? Thanks for your input.
Racer
Joined: Feb 2008
Posts: 485
Likes: 1
From: Texas
If TC or AHS kick in, the A6 will not upshift in either D or S mode. And you can't upshift using the paddles either while TC or AHS are active.
THUS, any time you reach redline w/ the either nanny active, the only way to avoid the rev limiter is to back off the throttle.
Also, if you turn off TC or use Comp mode, there's a note in the owners manual that warns:
"Notice: When traction control is turned off, or
Competitive Driving Mode is active, it is possible to
lose traction. If you attempt to shift with the rear
wheels spinning with a loss of traction, it is possible
to cause damage to the transmission. Do not
attempt to shift when the rear wheels do not have
traction. Damage caused by misuse of the vehicle is
not covered. See your warranty book for additional
information."
...as well as this one...
"Notice: Fuel will shut off at about 6500 rpm for the
base model and 7000 rpm for the Z06 model. If you
continue to drive your vehicle at the fuel shut off rpm,
you could damage your engine. Be sure to operate
your vehicle below the fuel shut off rpm or reduce
your rpm quickly when the fuel shuts off."
, MIG
THUS, any time you reach redline w/ the either nanny active, the only way to avoid the rev limiter is to back off the throttle.
Also, if you turn off TC or use Comp mode, there's a note in the owners manual that warns:
"Notice: When traction control is turned off, or
Competitive Driving Mode is active, it is possible to
lose traction. If you attempt to shift with the rear
wheels spinning with a loss of traction, it is possible
to cause damage to the transmission. Do not
attempt to shift when the rear wheels do not have
traction. Damage caused by misuse of the vehicle is
not covered. See your warranty book for additional
information."
...as well as this one...
"Notice: Fuel will shut off at about 6500 rpm for the
base model and 7000 rpm for the Z06 model. If you
continue to drive your vehicle at the fuel shut off rpm,
you could damage your engine. Be sure to operate
your vehicle below the fuel shut off rpm or reduce
your rpm quickly when the fuel shuts off."
, MIG
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Safety Car
Joined: Nov 2006
Posts: 3,860
Likes: 5
From: Tampa FL
Bad advice. When racing, I'm looking at the road not my tach. Come back and tell us about how your valves became embedded in your pistons at the dragstrip.
Pro
Joined: Sep 2009
Posts: 536
Likes: 2
From: Los Angeles California
just noticed someone re-activated a 2009 thread on a similar or identical topic today... don't know if this is coincidence or not, but this tread includes videos, in which the slow shift appears to me to be a result of hitting the limiter... don't know if it's the same issue/situation as yours or not, but if you hadn't already seen it, thought it might be of interest...
http://forums.corvetteforum.com/c6-c...g-problem.html
http://forums.corvetteforum.com/c6-c...g-problem.html
Pro
Joined: Dec 2009
Posts: 648
Likes: 0
From: Kalamazoo MI
just noticed someone re-activated a 2009 thread on a similar or identical topic today... don't know if this is coincidence or not, but this tread includes videos, in which the slow shift appears to me to be a result of hitting the limiter... don't know if it's the same issue/situation as yours or not, but if you hadn't already seen it, thought it might be of interest...
http://forums.corvetteforum.com/c6-c...g-problem.html
http://forums.corvetteforum.com/c6-c...g-problem.html
Thread Starter
Advanced
Joined: Mar 2010
Posts: 72
Likes: 1
From: West Bloomfield MI
I get the same issue when running 90% and above throttle, 1st gear always hits the limiter and I have to back off the throttle for it to change. I also have a Vararam installed with Callaway exhaust with Diablo tune. I'm betting these mods are allowing the engine to rev quicker and the auto box is too slow to change gear. I did have the dealer check the transmission and they could not find any issues and they even reflashed the transmission CPU with latest updates to no avail.
Pro
Joined: Dec 2009
Posts: 648
Likes: 0
From: Kalamazoo MI
I can confirm my 1st to 2nd lag is due to the traction control being enabled, I never noticed it before but I do get a warning on the DIC hence why she doesnt change gear when its supposed to. My tires are the ones that came with the vehicle and are almost due for a change anyways, question now is: Is it better to spash out the expense and go for the widebody mod with wider rims, this will take the tire width from 10" to 12" or stay as I am with Firestone wide ovals on the rear (I like the safety of the run flats)
Pro
Joined: Sep 2009
Posts: 536
Likes: 2
From: Los Angeles California
I think in many situations limited traction is to be expected with these cars. I would experiment with different surfaces and temperaturs to find out when your getting traction and when your not.
If temp and surface are not good enough you may still have traction problems even with newer, better, or wider tires.
I took me awhile to realize that even small changes in temp had a major effect on my traction. Night time with temps in the mid 60's, horrible wheelspin. Sunny day temp of 80, almost no traction problems.
If temp and surface are not good enough you may still have traction problems even with newer, better, or wider tires.
I took me awhile to realize that even small changes in temp had a major effect on my traction. Night time with temps in the mid 60's, horrible wheelspin. Sunny day temp of 80, almost no traction problems.
Safety Car
Joined: Nov 2006
Posts: 3,860
Likes: 5
From: Tampa FL
Le Mans Master
Joined: Jun 2007
Posts: 7,610
Likes: 12
So just because someone has the rev limits tuned out it does not necessarily indicate that the engine will be harmed.
Last edited by keyplyr; Jun 3, 2010 at 04:48 AM.