I have an 03 and the rev limiter is now set at 7k. I've good and bad things about this. I'm getting a built motor installed soon and will be pushing abour 450whp. Should I drop my rev limiter back down or keep it at 7k.

 

Are you talking about the shift light?

 

No the actual fuel cut. I've heard for power reasons people raise the limiter, but I've also heard that when you raise the limiter it increases the chance of breaking something.

 

people raise their limiter so they can eithe rev that extra amount or to have some extra cushion room on high hp cars so the fuel cut doesn't accidently happen because you held the gas pedal down an extra .03 seconds. Or also for people that want to rev to 7000 rpms in the first couple gears because it goes by so quick, but shift at the normal redline after that

I'd leave it at 7000

 

Now my next question, is it bad when you hit the rev limiter in a turbo charged car. I've hit mine a couple of times. And how is it that when guys miss shift, how does it damage the engine when the limiter is supposed to save that.

 

if you're at redline in 3rd gear and instead of shifting into 4th, you shift into 2nd gear, no rev limiter on the planet can compensate for the amount of mechanical multiplication 2nd gear has over 4th gear. You'll instantly rev to 9400 rpms


I would avoid hitting the rev limiter. It can cause a lean condition since fuel is cut and overheat things if you just sit there bouncing off of it all day

 

Thanks for the clarification. Most of the SCCA GT race cars I've driven have had a rev limiter that used the ignition to limit revs. Not sure if your system uses that or a fuel cut-out. Either way, after building an expensive race engine and determining the peak power and torque curves, the only time I'd raise it (or shut it off) was to briefly 'stretch' the motor (over 8500 RPM) at a certain point on the track. For a street application, I can't see any need for raising their rev limits unless the engine builder recommends it.

 

I'm using a fuel cut to limit my revs. I think I'll just keep it at 7k.

 

On a stock motor DO NOT RAISE your limiter, leave it at 6600rpm's. Inertial loads increase by something like 45% from 6000 to 7000rpm's. I ran a raised limiter in my TN and only used it for 1st and 4th gear. 3000 miles later---->rod failure, dont do it!

 

Thats my fear, whats your motor's rev limiter set at alberto, I know you have the built block. I'm gonna keep my TN setup for about a month and then be switching to twins.

 

7400rpm's right now. Only used it 1X for a 1-2 shift at the track. I peak at 6700rpm's now so I shift around 7000rpm's now built.

 

On a side note, did you get the new tranny in.

 

Yes see my thread below-its been updated with pics/info...

 

This sucks I can't see open the page on my work pc. Have to wait till I get home.

 

Good info. Now I know that I shouldn't raise it if the opportunity came about.

 

you know guys, just because the limiter is raised, doesn't mean you HAVE TO rev all the way to it. It's just available if you needed to or accidently did.

I'd rather accidently rev to 7000 rpms than at 6800 rpms with the rev limiter cuting the fuel

 

I had my fuel cut @ 7400rpm and ran it like that for a month. Flogged on it here and there up to the fuel cut on highway runs w/ buddies, but when I upped the boost I put it back down to 6600. It was a little too weird wrapping up the engine that high, I eventually lost the required bravery to see it go past 7k rpms.

 

Sentry I 100% respectfully diasgree. Bouncing off the rev limiter at 6600rpm's is much easier than the occassionaly over revving to 7000+rpm's. If you ask most guys whp blow up stock blocks they all shared your mentality, how much do you think it has to do with rod failure? I obviously think its a huge factor.

 

well yeah I do think reving to 7000 is a bad idea as far as reliability goes. It'd have to be more of a scientific test to know which really is worse for the engine - hitting the rev limiter or reving a couple hundred rpms higher because right now it's just guesswork. I think even when your engine let go it was in mid rpms right? How can we be sure it was from reving to 7000 a lot? I dunno, it probably was a factor though and I'd bet money on it, but it might have been other reasons too that contributed to it failing

My rev limit is 7000 but I still try to shift at 6600 rpms because I don't think going that extra fraction of a 10th of a second is worth possibly hurting the engine - which is already stressed almost twice beyond what it was intended even at 6600 rpms

 

Well I can think of 4 guys off the top of my head (not counting myself) who blew motors on stock blocks because they raised the limiter in an attempt not to hit it. I can think of many guys who race and keep stock limiters who bounce off them daily and are fine above power levels I was pushing. Thats enough for me to not recommend it....