Hey Guys,

just received my Durametric cable and so i took
a look at my over-rev's.
when i bought the car 50 operating hours ago
the rev chart looked like this:

Range 1 – 11.048 - @451,5
Range 2 – 990 - @450,7
Range 3 – 141 - @450,6
Range 4 – 28 - @51,7
Range 5 – 0
Range 6 – 0
Total Hours: 452,8

and thats what it looks now:
Range 1 – 18.146 - @497
Range 2 – 3143 - @495,8
Range 3 – 517 - @492
Range 4 – 47 - @492
Range 5 – 0
Range 6 – 0
Total Hours: 500,3

i'm a bit disappointed to be honest as i never miss-shifted.
all those over-rev's where done on upshift only.
however when you do a quick shift, you get some high rev's as there
is still some momentum from acceleration when engaging the clutch...

IMO an over-rev is when you want to up-shift on acceleration and
accidently shift to a lower gear....1 instead of 3 for example and not just a little over-rev on upshifting.

common... i did over 2000 over-rev's in range 2 within 50 hours
what's that fu***** rev-limiter for than?!
yes, i do drive the car sporty, but that's what it's built for, isn't it?
but now as i've seen how quick those numbers rise, i'll have to shift at 6k rpm if i ever want to sell the car.

and the ones in Range 4!? seriously!? Range 4?
I SWEAR (my ***** should fall off right away if i'm lying) I NEVER INSERTED A WRONG GEAR NOR HAVE THERE BEEN ANY EARLY DOWNSHIFTS.

that's it with my CPO now.
time to get an exhaust.

cheers,
Luke

 

Don't worry man. Yes it may hit your car's resale value.

I was also in the same boat as you when i hit the rev limit on idle.
Even over-rev readings from PIWIS and durametric vary. Maybe you should go to your dealership and read it using PIWIS.

Recording range 4 on idle is not very common and I believe the porsche DME is not recording over-rev's correctly. This was voiced by some others as well on here. I can't seem to find the thread.

Anyway, once recorded, there is nothing you can do about it really. Just enjoy modifying your car.

 

Stop worrying and enjoy the car. I see no over revs that would damage resale anyway. No 5 or 6 so what is the problem ?

 

You should have a raised rev limit...around 7200rpm...so when you acceletate you always hit range 2 over revs even when you re just close to rev limit...assuming your rev limit is 7200 when you hit it hard from 1st to 2nd and stay there for some tenths of a second youcan easily register range 4 over revs...

 

from my understanding, even if he raises the rev limiter, the car will continue to register range 1,2,3, etc over rev ranges in the ECU.

In other words just because you raised the rev limiter to 7300 and shift at 7000 or 7100, you will still be adding to the over rev count.

 

Anyone that can explain this Over rev thing?

I've had it happened to me many times that I hit the Rev limiter on my Turbo S when going from 1st to 2nd.

I didn't think this was a bad thing...

 

Send it to the company that provided your tune. They take the ECU out and delete all that stuff. Piece of cake!

 

Enjoy! This is why you bought it!

 

i would not have said a word on those overrevs if my limiter was raised.
but i am on STOCK 6.800rpm limiter.
the range 4 over-rev happend as i powershifted from 4th to 5th - could reproduce this
any time without miss-shifting. -that's just not right imo.

this reduces the fun-factor of the car as i now have those numbers on my mind everytime i rev to redline.

when do you guys shift? in order to get a range 4 overrev i'll have to reach 7.340rpm, so that's just 540 rpm above the limiter.
so to stay safe from any over-rev counts i'd have to shift at 6.200rpm.

i dont get it.... even though reaching range 4 without a miss shift is not very common,
a range 3 over-rev can be done without a miss shift easily.
so someone on this forum wrote Porsche reads this over-revs like this:

Rev range 1: 6,740 -1 ... to 6,940 -1
⇒ Maximum permitted engine speed exceeded; engine damage possible.

Rev range 2: 6,940 -1 ... to 7,140 -1
⇒ Maximum permitted engine speed exceeded; engine damage possible.

Rev range 3: 7,140 -1 ... to 7,340 -1
⇒ Maximum permitted engine speed exceeded; engine damage probable.

Rev range 4: 7,340 -1 ... to 7,840 -1
⇒ Maximum permitted engine speed clearly exceeded; engine damage probable.

Rev range 5: 7,840 -1 ... to 8,940 -1
⇒ Maximum permitted engine speed very clearly exceeded; engine damage very probable.

so if even 6.740 leads to a "possible engine damage", why do they set the limiter to 6.800 than?
of course we all know that this wont lead to any engine damages!
but why are they scaling those ranges sooo stupid than!?
7.140 is already range 3 - am i driving a diesel or what?

maybe i'm over-reacting on this but...you know... i'm annoyed about it.
i treat the car fine, i'm not reving over 3k before the oil reaches 80°C, i let it cool down everytime before turning it off, i do change the oil frequently, i really take care of the car but this is not written anywhere on the dme!
DME says: hey this guy beats the crap out of me all the time, dont buy me.
that sucks.

cheers,
Luke

 

I'm not saying engine damage can't happen from an over rev, obviously it can. but having been on all the 997 turbo forums for over 4 years I have yet to see anyone who has damaged their engine. The entire over rev thing in my opinion is simply so that Porsche could deny warranty work and has been blown way out of proportion.

 

Interesting to note that a dealer just told me they cannot cpo a car if it had ANY range 4 overrevs. I told him I didn't think that was the case and he told me it was a recent change in policy.

 

I think of it this way, their over rev values are on a very conservative side. If the over-rev points were higher, we would hit them anyway.

Just like when the R35 GTR was launched, GTR engineers advised that the engine was already producing maximum power and torque and any attempts to increase power would be futile and lead to engine damage. We all know that's not the case. Many powerful GTR's out there.

They always build in a margin knowing consumers will always want to squeeze out every drop of power. Same thing here.

Don't worry too much about it, i shift close to 7k rpm and its fine.

 

True that

 

I don't have a DME report but my car has some range 6 overrevs and it has no problems. They happened years ago, halfway through its operating hours. I didn't know about DME reports when I bought it and I'm sure the vast majority of owners don't.

 

200 engine hours after last overrev cpo is possible after some tests (compression , oil filter, etc)