matttheboatman

Does anyone know the over-rev range for the GT4; Type 1, 2, 3, 4, 5, & 6?

My DME showed 150 Type 1 over rev's "ignitions". I don't recall any miss shifts, but I did get to the rev limiter several times. Could that have caused the Type 1 over revs?

In trying to figure out how long it takes to do 150 "ignitions", please check my math. If the car reaches over rev at 7,800 rpms (revs per minute). So, I divide by 60 second, equals 130 revolutions per second. (7,800 / 60 = 130 per second)

If there are 3 ignitions per each rev, then there are 390 ignitions per second right? (130 x 3 = 390 ignitions). So, if I have 150 over revs ignitions, then I went "over the line" for about 1/3 of second (150 / 390 = .384 of a second).

I am uber- careful not to exceed max rpms, so even if it happened in a split of a second, I don't recall it. Could it be the rev limiter???

orthojoe

Iirc, range 1,2, and 3 are not a problem. Above that is a problem. 1 and 2 are just from hitting the rev limiter and is of no consequence

STLPCA

^Plus, the over-rev figures are cumulative, so your 150 may represent several bump ups against the rev limiter of even shorter duration. If you track, you'll inevitably have 1s and probably 2s. No worries.

kyrocks

Don't worry about range 1 or 2.
I've checked my PDK cars before and I get range 2 there! I checked my GT4 and I have zero over revs. I drive like a ***** though. Lol.

Spyerx

It would be interesting to see the specific ranges. Does this live in the PIWIS 2?

The 997 GT cars have a range like this, you can bounce off the rev limited all day long and not get range 1. It varies in models in the .1 and .2 range but limiter is ~8500:
Range 1: 9000-9200 RPM
Range 2: 9200-9400 RPM
Range 3: 9400-9600 RPM
Range 4: 9600-10000 RPM
Range 5: 10000-11000 RPM
Range 6: 11000 and up RPM

Alan C.

Your math looks correct. About 0.38 sec. That would not bother me.

stingray84

Can someone help explain what are the definition of range 1-6 and how to check for this?

coldfire

I found this article helpful, no specific info on 981 Cayman / GT4 though: http://www.911virgin.com/porsche/rev-range-information/

Based on that, I'd say "range 1" is probably >8000rpm, "range 2" > 8200rpm etc.

Range 6 on a GT4 mostly likely in excess of 10,000rpm.

orthojoe

No, range 1 is not >8000 rpm...

Range 1 should be the redline, which is 7600 or 7800 for our cars, I believe

coldfire

Porsche indicates redline, "Cut-off speed" in the technical manual, of 7800rpm, so I was just adding +200rpm to that. That's just based on some random Internet page though, so I'm definitely not saying that it's accurate.

Houston GT3

Thanks Coldfire. That article was really helpful.

James88

I have also been told it can have false over rev readings by just stalling the car.