[NewCamaroGuy2018]

I am wondering if over revving (missed shift) caused my frozen lifter problem. What happens when you hit the limiter? I have never noticed anything on my 2022. My 1999 Firebird immediately goes into fuel starvation, very easy to tell. Can you lower the rev limiter on the ZL1 1LE?


Thanks.


PS search engine on GOOGLE and this forum were of no help.

[wakespeak]

I hit it often enough but never on a throttle lift AFAIK (only on acceleration)- no issues. Fuel is cut off and its very obvious. If you are downhill elevation change I could see where the gearing could force the engine past the 6800 rpm cut off. Probably bad luck but - Was your oil fully warmed up? Over filled (aerated)? Using rev matcher? - helps prevents shocks to the rotating assembly.

[Vigilante375]

Never heard of anyone wanting to lower the rev limiter. But I'm sure that can be done through a tune. But then you're going to be on the same situation but at a earlier RPM and lose power, depending on how much it's lowered to.

The rev limiter is there to help the engine from over revving which can cause damage to any moving/rotating part of the engine, pretty much. It cuts the fuel to stop it from going over the rev limit.

Anything could cause a frozen lifter. Holding the car at high rpms for an extended amount of time, misfiring, bad fuel, a spring, etc.

[Kamero6]

It should take a overrev to 7k with no issues.

In modern engines you have soft limiter and hard limiter. Approaching it will close the throttle body, and retard ignition. Then you hit the hard limiter, it will cut the fuel.

You can still over rev it mechanically by shifting into a lower gear.

[NewCamaroGuy2018]

Originally Posted by wakespeak

I hit it often enough but never on a throttle lift AFAIK (only on acceleration)- no issues. Fuel is cut off and its very obvious. If you are downhill elevation change I could see where the gearing could force the engine past the 6800 rpm cut off. Probably bad luck but - Was your oil fully warmed up? Over filled (aerated)? Using rev matcher? - helps prevents shocks to the rotating assembly.

WakeSpeak, Thanks for the reply. I have had 12 track days with my ZL1 1LE 6 speed. I have yet to feel any fuel cut off. Oil warmed up, no overfill, and using rev matching.

[NewCamaroGuy2018]

Originally Posted by Vigilante375

Never heard of anyone wanting to lower the rev limiter. But I'm sure that can be done through a tune. But then you're going to be on the same situation but at a earlier RPM and lose power, depending on how much it's lowered to.

The rev limiter is there to help the engine from over revving which can cause damage to any moving/rotating part of the engine, pretty much. It cuts the fuel to stop it from going over the rev limit.

Anything could cause a frozen lifter. Holding the car at high rpms for an extended amount of time, misfiring, bad fuel, a spring, etc.

Vigilante375, thanks for the reply. I use my ZL1 1LE as a track car! What is high rpms and what is an extended period of time? My track sessions are 20 minutes at 4k to 6k rpm.

[NewCamaroGuy2018]

Originally Posted by Kamero6

It should take a overrev to 7k with no issues.

In modern engines you have soft limiter and hard limiter. Approaching it will close the throttle body, and retard ignition. Then you hit the hard limiter, it will cut the fuel.

You can still over rev it mechanically by shifting into a lower gear.

Kamero6, thanks for the reply. It sounds like the rev limiter is NOT going to help with a missed shift. I need to watch my shifts!

[Vigilante375]

Originally Posted by NewCamaroGuy2018

Vigilante375, thanks for the reply. I use my ZL1 1LE as a track car! What is high rpms and what is an extended period of time? My track sessions are 20 minutes at 4k to 6k rpm.

High, sustained rpms like say where you're at 6k RPMs for 5 minutes straight. Yes, you're more likely to melt the headers and over heat the engine but if you're moving at a decent speed to keep the air flowing then it's fine (think NASCAR). But that is still going to cause issues to the rotating/ moving parts.

And you're comment about rev limiter helping with missed shifts is kinda correct. If you downshift too early or go from 3rd to 2nd when you meant to go to 4th, the rev limiter won't help.

[Kamero6]

If it helps, unless you're getting paid if you win, shifting like a beast won't improve lap times much and even if you don't miss, it takes a toll on the drivetrain. (I've learned it the hard way).
Nothing better that have fun and come back with the car in 1 piece.

[wakespeak]

Originally Posted by NewCamaroGuy2018

WakeSpeak, Thanks for the reply. I have had 12 track days with my ZL1 1LE 6 speed. I have yet to feel any fuel cut off. Oil warmed up, no overfill, and using rev matching.

You won't feel it until you hit the actual 6600 rpm fuel cutoff. I said 6800 rpm earlier but looks like it is 6600rpm checking on the web. You'll hit it at some point with more track use.