X2
Rev Limitor
Melting Slicks
Joined: Nov 2007
Posts: 2,281
Likes: 552
From: Pittsburgh PA
St. Jude Donor '10-'11-'12-'13-'14
Le Mans Master
Joined: Oct 2012
Posts: 5,787
Likes: 36
From: Tampa Florida
Devil's advocate, fellas, says that we can bounce this bulletproof LSX off the same all day long with no fear of failure...and isn't fear of failure what hampers us? I am just here to provide moral support.
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Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
It's fine to rev an engine to 4,000 when it is under a load, but doing it in neutral is generally not a good idea. When revving the engine for a maximum performance launch, it is only momentarily at the 4,000 level before dropping the clutch.
Melting Slicks
Joined: May 2010
Posts: 2,142
Likes: 78
From: Rancho Santa Margarita California
OK....maybe the reasons are obvious and I just don't understand....but why? I run my engine up above 4K all the time while driving, why would it be a problem when there's no load on it? The only "mechanical" reason I can think of would be cooling since there is no airflow from the motion of the vehicle.
Otherwise, the assertion makes no sense to me....I run my motor above 4K with a positive load (accelerating), and with a negative load (downshifting) all the time.....so why would no load be so bad for it?
Otherwise, the assertion makes no sense to me....I run my motor above 4K with a positive load (accelerating), and with a negative load (downshifting) all the time.....so why would no load be so bad for it?
Le Mans Master
Joined: Jan 2005
Posts: 5,611
Likes: 5
From: Thousand Oaks California
When you are in gear there is a much greater amount of rotational mass to help dampen out vibration and the firing pulses. When is gear, you are mechanically connected through the clutch to the drive shaft, differential, axles and wheel/tire assemblies.
Also, when in gear with load on the engine, all of the drive train "slack" is eliminated.
Also, when in gear with load on the engine, all of the drive train "slack" is eliminated.
Last edited by calemasters; Jan 7, 2013 at 04:58 AM.
Safety Car
Joined: Feb 2011
Posts: 4,205
Likes: 21
From: Arlington VA
I dont see a mechanical issue with doing it. But I do have to wonder why someone would want to do it.
Reminds me of those guys on sportbikes who love to rev their engines all the way to the limiter, while sitting at a redlight.
Reminds me of those guys on sportbikes who love to rev their engines all the way to the limiter, while sitting at a redlight.
Safety Car
Joined: Nov 2006
Posts: 3,667
Likes: 159
Launch control holds it in the 4k range on the manual shifts, so the car is designed for it.
You should not have any engine rev issues at 4k rpms, any more than you would for the other "abuse" that our cars are designed for.
Naturally, do it with engine at operating temps, full of fluids, watch the wheel hop, be pointed straight with the steering, etc.
And, since we're also talking autos, I would not drop it from Neutral into Drive at 4k rpms either.
Safety Car
Joined: Apr 2010
Posts: 4,231
Likes: 451
From: Maryland
Heres "one" that you & "I" will understand and make sense.
The engine has a rpm limit that should not be exceeded/red line, above that the valves may float, if the valves float you could have piston to valve contact depending on engine design but even if that does not happen per articles I have read the valves may now float at a lower rpm next time around and so on.
In free revving anything even remotely close to it's limit it's "very" easy to shoot past/exceed the intended stop point.
Who knows about the bikes, they may have a 10,000/12,000 redline and the rider is only going to 8 grand.
or the guy just does not know it may not be a good thing to do.
In free revving anything even remotely close to it's limit it's "very" easy to shoot past/exceed the intended stop point.
Who knows about the bikes, they may have a 10,000/12,000 redline and the rider is only going to 8 grand.
or the guy just does not know it may not be a good thing to do.
Last edited by C7/Z06 Man; Jan 7, 2013 at 11:40 AM.
Safety Car
Joined: Apr 2010
Posts: 4,231
Likes: 451
From: Maryland
I never knew this, Thank You.
Now I know that if for some reason I accidentally floor the gas pedal in park the car's rpm's won't sky rocket off the chart.
PS: I think the rev limiter will kick in at approx. 6500 rpm no matter what!! Example: Your going full out in S mode near the red line in second gear when by accident you over shift to neutral instead of D mode; Well, the rev limit kicks in and saves your a$$. Teck can be a wonderful thing.
Last edited by C7/Z06 Man; Jan 7, 2013 at 02:47 PM.
Team Owner
Joined: Mar 2008
Posts: 21,502
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From: Southern Utah
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
I also have an Automatic Vette its an 05 (A4) & found you initial question VERY interesting....!!!!
Would you disable the rev limiter, & put it in "N" and floor it, and see how high the RPM will go before you start hitting the hood with valves, etc
I think you can get 8000 RPM for a few seconds, and Be sure to make a video of it I know a lot of interested people would like to see if it will go to 8000 RPM or maybe even 9000!! RPM
Here is a link (I hope it works) although its not a Corvette engine...
Last edited by jpee; Jan 7, 2013 at 09:03 PM.