Rev-Limiter

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Dec 31, 2007 | 07:57 PM

country2

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Rev-Limiter

This evening I got on my truck hard for the first time since I have owned it. It was in 2nd gear and I was watching the boost (about 22 psi ) and when I looked at the tack it was in the red about 3700 rpm if I remember correctly. I thought that the rev limiter would hold it at red line. Do you think it hurt anything??? I won't be doing that again.

Dec 31, 2007 | 10:16 PM

medhvac

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From: house springs,mo

I dont think diesels have rev limiters, but they do have governers that keep the rpms from getting too high, just like a rev limiter does...

Dec 31, 2007 | 11:05 PM

twags6

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From: Slatington, PA

The PCM controls how high you can rev the engine by limiting the fuel (same as the speed limiter at 94 mph). 3400 rpm's should be the redline. Now when you shift, it can rev higher because you have the engine loaded and when the trans shifts, it unwinds a bit and revs higher.

Jan 1, 2008 | 12:09 AM

jtharvey

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From: Columbia, MO

Won't hurt a thing.

Jan 1, 2008 | 12:20 AM

twags6

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From: Slatington, PA

How high can these engines actualy rev before some damage starts?

Jan 1, 2008 | 01:04 AM

SolidGround

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From: I'm there!

Quote:

Originally Posted by twags6

How high can these engines actualy rev before some damage starts?

Depends what you're working with.

The stock valve train tends to 'float' around 3700.

Jan 1, 2008 | 06:26 AM

country2

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I thought right before it shifted I felt it dump fuel. So you do not think that short burst would hurt these engines?

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Jan 1, 2008 | 11:52 AM

jtharvey

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Joined: Oct 2004

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From: Columbia, MO

Quote:

Originally Posted by country2

I thought right before it shifted I felt it dump fuel. So you do not think that short burst would hurt these engines?

What you may have felt was the PCM cutting the injector pulse width (how long the injection shot it) back, and may have felt like a fuel dump. As you approach redline, the PCM cuts it back, which you can see as popping and stuttering, typically on initial launch, in some of the pulling videos out there.