Just ran an overrev report.. - 6SpeedOnline - Porsche Forum and Luxury Car Resource



997 Turbo / GT2 20062012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.

Just ran an overrev report..

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Old 07-15-2017, 06:33 AM
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Just ran an overrev report..

..and I'm not too happy with the results. Here is what it says:

Total Hours: 1613.3

Range 1: 65535/1611.9h
Range 2: 65535/1611.9h
Range 3: 28777/1611.9h
Range 4: 10040/1611.9h
Range 5: 2102/1127.6h
Range 6: 63/921.3h

From the source I read, the breakdown for 997 Turbo's is:

Range 1: >6800 and <7000
Range 2: >7000 and <7200
Range 3: >7200 and <7400
Range 4: >7400 and <7900
Range 5: >7900 and <9000
Range 6: >9000

Now according to the report there were range 4 overrevs 2 operating hours ago. All range 5 revs were over 486 hours ago, and the last Range 6 overrev was 692 hours ago. From everything I've read, it would seem that the range 5 and 6 overrevs happened long enough ago that the threat of damage caused by these is minimal. However, the range 4 and below happened less than 2 hours ago. My question is, how can that be? I have a custom Cobb Stage 2 tune, but I've never missed a shift and usually don't take the car above 6500rpms. I've certainly revved it out a little longer a couple times since I bought it, but I've never went as high as 7400rpms, unless the tach is just highly inaccurate.

I tend to think that the overrev report is not as big of a deal as some make it out to be, and that if there was any damage caused, it would've shown itself by now (maybe not in the case of the Range 4 and below) but I know this will hurt resale value (good thing I don't intend to ever sell).

Should I be worried at all? I was expecting maybe some 2s and 3s but never a range 6. How do you even get the car above 9000 rpms???
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Old 07-15-2017, 07:16 AM
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You mechanically over-rev the engine by downshifting to the wrong gear. IE from 5th down to 2nd when you meant to grab 4th.

600 hours of operation since the over-rev? You are way, way beyond the threshold of any argument of time for problems to manifest. Some people say any damage incurred would be known immediately right when the over-rev happens. Others say you need 50 hours of operation before giving the 'all clear'.

600 hours I am sure everyone would agree it's a non-issue for you. Of course, it will still be an issue to the next buyer if you ever sell it... Keep it forever!
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Old 07-15-2017, 08:53 AM
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That car had been driven hard, first time I've seen one maxed out for range 1 and 2.. so you have no idea what the real number is for those ranges.. over 2k in range 5?
A raised rev limiter would account for some of these but even that report gives me pause.

With all the red flags this car presented before you bought it I guess I'm not too surprised. I guess at this point just keep driving it and don't worry about it.
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Old 07-15-2017, 09:49 AM
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I've had some similar tomfoolery on mine, where it shows some new range 1s and 2s during my ownership despite never redlining the car, always shifting by ~6000rpm max. It has an EvomsIT tune which makes me wonder if tunes can make the report less accurate, even after considering the raised rev limit making it easier to gather 1-3s.

In any event, yours is at least a good example that these engines don't just arbitrarily explode after being driven hard.
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Old 07-15-2017, 10:09 AM
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Well, the report does look quite bad. But who cares, when the car is running. I guess all future buyers looking for manual shift gears are ready to accept such a report. Anyone looking for a slow driven turbo will watch out for the tiptronic s.
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Old 07-15-2017, 10:43 AM
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that is by far the worst report i've ever seen. That had to be a dedicated racecar or stripcar.
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Old 07-15-2017, 01:41 PM
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Over-revs are over rated
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Old 07-15-2017, 02:30 PM
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Quote:
Originally Posted by Harry Da Hamster
Over-revs are over rated
^^+1. Of all the performance cars I have owned, the over-rev paranoia is comical.....especially from a 911. I wish I had 5s and 6s just so I can start a group separating the driving Ms Daisy types. :-). Who ever has 6s, High Five!!! For a car meant to be.
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Old 07-15-2017, 03:07 PM
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the report is innacurate, the crank sensor can have noise in it and it gives a stupid RPM value. I have seen this many times first hand.

Rick
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Old 07-15-2017, 03:45 PM
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Originally Posted by au2bahn View Post
^^+1. Of all the performance cars I have owned, the over-rev paranoia is comical.....especially from a 911. I wish I had 5s and 6s just so I can start a group separating the driving Ms Daisy types. :-). Who ever has 6s, High Five!!! For a car meant to be.
I love how some people run for the hills when they PPI a 997 and it has some ancient range 4s on it, but yet virtually every other manual vehicle they've ever bought could have had 3 money shifts in the last 10 miles and they'd be none the wiser.

I assume Porsche included the rev report as a way to deny warranty claims but for all the overhyped heartburn they cause I wish they hadn't.
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Old 07-15-2017, 03:55 PM
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As stated many times, this rev counter is far from accurate. The ignition ranges simply do not add up to what actually occurs when driving the car. I've gone out and documented the ignitions, done a log to 7k rpm, and then see increase in range 4s, when then highest the car ever revved was 69xx as reported by the ECU.
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Old 07-16-2017, 09:33 AM
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Over hyped and way overrated!
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Old 07-16-2017, 04:45 PM
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Quote:
Originally Posted by au2bahn View Post
^^+1. Of all the performance cars I have owned, the over-rev paranoia is comical.....especially from a 911. I wish I had 5s and 6s just so I can start a group separating the driving Ms Daisy types. :-). Who ever has 6s, High Five!!! For a car meant to be.
Yup, an over-squared Mezger engine (large bore, small stroke) with a low 6,800 rev-limit, over-revs for our car are ridiculously over exaggerated. If we're talking GT3 where range 4+ is 10k+, that might be a different story. Too bad there's no over-rev reports on the over priced air-cooled Porsches...
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Old 07-17-2017, 12:08 PM
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Nobody cares about ovverrev reports anymore, half of them give error readings and the other half are not worth talking about.

There are a ton of tuned cars on stock motors with raised redlines of 7-7800 with no issues.
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Old 07-19-2017, 06:41 PM
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Looks like your engine builder was wide awake and had a good day when he made your motor. Mine was too!
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