I was doin some pulls with a new camero and I forgot to shift into 4th. I bounced off the limiter in 3rd gear. I immediately shifted into 4th and everything seemed ok. I have a totally stock 03 Turbo with no chip or anything that would raise my rev limiter. Will this be recorded as an over rev? How much if any does it damage the car? This is only the second time I've done it in the 6+ month's I've owned the car.(first manual car, taught myself to drive in my Turbo )

 

I don't think it's a big issue, that is why there is a rev limiter. I'm sure others here will say differently, but I think there are way too many paranoid people on here. I don't recommend you bounce off the limiter every shift, but every once in awhile is nothing to get too excited about IMO.

Downshifting into a lower gear when you meant to upshift is FAR more troublesome.

 

^ what jsbear said.. only to add, that if your rev limiter has been raised to accomodate more power from a flash though, hitting the rev limiter can fry the maf. maybe not just once, but it will. at least that's been my experience. stock, won't be a problem.

 

I've done the 'meant to shift up but shifted down' thing exactly once,.I wonder how bad that actually is, I prob don't wanna know. The other day I was trying some doughnuts in the rain (so easy w the power the Turbo makes) and I ended up doing a full 360 (180 degrees more than I meant) and I forgot to push the clutch back in all the way, and it stalled. Usually when it stalls I can start it right back up, but I cranked it and it didn't turn over this time. I had to crank it 3 tims and give it some gas, then it started and drove fine. Any thoughts?

 

Doesn't do anything, just don't money-shift it.

 

in first gear, it's easy.

 

Don't worry about it during up shifts..
It can be a bad thing on down shifting though..

 

Really...could you explain the physics around this statement. What does the airflow over the MAF have to do with revs?

 

It's very bad. That is how you lose races. I hit the limiter twice here and lost by more than I wanted to:

 

Hans Hoffman at RUF told me he revs up to the limiter on almost every shift. It's the missed downshifts that get you.

 

its also downshifting from 4th to 1st by mistake This can kill your motor as the rev limiter will not detect this over rev condition.

 

The OP said he only hit the limiter on the way up. That would result in at cat 1 over rev - no big deal. The other poster who said he shifted down instead of up - that could be a big deal. That would be logged as a cat 2,3 or 4 depending on how far he let it go before he recovered and could result in major engine damage.

The rev limiter only cuts fuel to stop your engine from reaching any higher rev. The stock limit leaves a margin of safety so that you could technically keep your foot on the gas and not break anything (I wouldn't advise that though). If you down-shift instead of up, cutting fuel will not stop the revs from passing any safety margin and you could force your engine into 10 K RPM or more where the safe limit may have been 8. (picture parts flying off all over he place)

 

i can't as that's beyond my pay scale. but that's what i'm told by the shop that tunes/races these.. and it's a curiousity that nearly every time my rev limiter which has been raised, gets pegged, the maf failure is not far behind. could be a coincidence? but i don't think so. sorry, no hard data beyond my anecdotal experience with many mafs and what i was told. very reputable shop, can't imagine they are fabricating a maf tale, but who knows. ymmv, obviously. again, for clarification, i was told this is only a potential issue on tuned cars that have had the limiter raised.

.... and i'm now going to add tony @ epl to the list of reputable tuners that know of potential maf failures caused by a voltage spike from increased rev limiter?. it is, after all, just a diode.. no? so perhaps it isn't a coincidence at all.

 

It's as insignificant as to say the better question would be, did you beat the Camaro or not?

 

There are only 2 types of overrevs in the 996 (US anyway) which are type 1 and 2. You can search here as it's been beat to death.

Type 1 no one cares about, but Type 2 means you went over some higher treshold and people associate that with engine damage. Some claim that means you money shifted, but it's been proven you can hit type 2 over revs some other way.

So take it for what it is. Hitting the rev limiter is what's saving your engine, so you're fine. I mean, don't drive around at redline all day, but hitting it now and then isn't really going to do any damage and should (in theory) only result in a type 1 over-rev. The most tanglible affect hitting the rev limiter will have is on your resale value. If you have a REALLY high number of overrevs, then you might get less for the car. That's about it though.