Hi everyone, I'm getting ready to purchase my first Porsche this week. I received the over rev report and I'm not sure what to make of it. I've seen mix reviews and feedback regarding how to read it. It's a 997.1 Turbo w/15k on the clock.

The over rev report reads:

Range 1 - 1752
Range 2 - 391
Range 3 - 64
Range 4 - 1
Range 5 - 0
Range 6 - 0

I've referenced the Porsche charts regarding RPM ranges but my questions to everyone here is:

1. Does this seem like it's been excessively revved compared to your car or others with similar mileage?
2. Would you purchase this car if it met your requirements?
3. Could there be engine damage?

Thanks for the feedback

 

In my opinion there's nothing shocking there. I personally wouldn't worry too much.

There are no range 5 and 6 which is good. That's where you would see a serious mechanical over-rev, like a missed downshift or something. Range 1-3 aren't that serious in my opinion, especially only 64...that means it really only happened once, maybe twice.

 

Turbo

Deciphering the DME report goes like this:

Each range, 1-6 corresponds to an RPM range. Don't know exactly what the 997 turbo numbers are, but generally range 1-3 over revs are "acceptable", 4 and above are a relative concern.
Here is what the numbers mean.

The engine DME records cylinder ignitions (sparks) when thery occur within the ranges 1-6. Below ranges 1-6 are lower rpm.
With an engine operating at ~3000 rpm there are ~50 revs/sec, with 6 cylinders makes it ~300 sparks/sec.
With an engine operating at ~6000 rpm there are ~100 revs/sec, with 6 cylinders makes it ~600 sparks/sec.

Each count (1752) in range 1 indicated the engine spark occurred above the specified rpm - maybe in the 7000-7200 rpm range for range 1. So let's say a missed down shift occurred and it lasted ~1 sec, it would record ~699 range counts (7000/60=116, x6=699). If it was a fraction of a sec., let's say 1/10th, it would be ~69 counts.

Same logic applies for the higher ranges.

I'd say you OK with the numbers indicated.

Bob D

 

thanks for the information. That makes me feel comfortable making the purchase.

 

Only 1700 range 1s?

Car was really never driven hard. This is pretty much a perfect DME.

 

Turbo

Did you receive a printed DME report? or another form?

Did the report with the range counts numbers posted include the exact 997 Turbo/GT2 VIN that linked the report to the car?

I'd like to see the actual report showing the VIN and the range counts, for my use for other reasons.

If you have it please send, or attach to a post.

You can't PM the report until you have 5 posts, but I'll get you my email.

Thanks -
Bob D

 

Out of town now. I'll send info when I get back next week. thx

 

+1

I have 5 ignitions on range 4, happened almost 7 months back, car is fine and I tuned it recently too

range4 happened during a spirited drive when the intended 4th gear slipped back into neutral and i stepped on throttle. Many people i talked to claim this is not possible as the limiter would stop that from happening. I hit the rev limiter recently after my tune and it recorded ignitions in ranges 1-3, but never 4. The tune did not increase my redline. I read somewhere else on the forum that the DME sometimes records this information incorrectly.

Anyway, the car is running perfectly and I had no issues at all. Hope this assures you and best of luck with the purchase

 

Its completely fine. Even if those numbers were double...it would still be fine.

 

djben is right. That reports shows minimal use. Best of luck with the purchase!

 

This is an interesting article. I never knew these reports existed in Porsche's computers. This really makes the buying experience for the buyer a littler easier (piece of mind). However, does it allow us to really "enjoy" our cars like they were built to be?

 

Purchased the car on Thursday. Mint condition. Now I have to wait for it to arrive from the Midwest. Thanks for the quick feedback, guys. Much appreciated.

 

I have had my 2007 997 turbo tested for over rev by a reputable independent Porsche dealer who wanted to buy it. He could not buy it because he was not happy with the over revs, I cannot remember the figures exactly but I do believe he was genuinely dissapointed not to be able to buy it. Apparently it happened on a downshift ( sorry to be so vague) He said he would be interested in the car again after 200 hundred hours and a compression test. I have since decided to keep it and would like to know if I have to now take special care with the car or do I continue as normal ( i am a mature driver so don't thrash the car everywhere) but I have been invited on a track day tomorrow and am wondering if it is advisable?
I would appreciate any quick replies before tomorrow please.
Thanks

 

He is waiting for the 200 hours because if there was an issue from the over rev, it would show itself by then. If it is ok in 200hours then the motor is fine.

Continue to drive as normal!

 

Get ahold of the December issue of Excellence magazine - very good article on over revs. Should help you out. Same article is in one of the UK Porsche magazines too - can't remember which one though.