michaelp1usa

The PPI shows an over rev in Range 6.
2005 997 Tiptronic.

Is that even possible?

Wouldn't the engine and/or gearbox explode?

USMC_DS1

How many over revs?

dasams

I'm sure you know this but you can't have a '6' without also having a '5' and all over lower ranges. Some reports pick up an erroneous single ignition in '6'. Is that what you see?

Macster

My info is is it possible to over rev a Tip. Over rev the engine past the point the fuel is switched off.

I would be hard pressed to imagine how there could be one overrev in range 6 and none in the lower ranges.

My theory regarding inexplicable non-zero values in the higher over rev ranges is this is some sort of over rev range counter "tamper detection".

Say someone damages an engine by over reving the the engine then somehow attempts to change the over revs counters then takes the car in for a new engine under warranty.

Unless this person is aware of how that tamper detection scheme works it will be clear when Porsche reads these as it will before it honors the warranty claim over rev range counter tampering has occurred and the claim will be denied.

USMC_DS1

Some RL members have reported a 1's or 2's in their higher over rev ranges... and so do I. For example, my RMS reports illustrates normal over revs in range 1(414) and 2(25) on my '08 C2S MT and a strange single ignition over rev in ranges 3-6... this is an anomaly. The p-dealer I purchased my car from under factory warranty plus CPO believes that it was a dealer ECU remap count outside of the factory. I still secured a printed out RMS report with date stamp from the dealer to ensure that there are zero questions down the road regarding warranty work. BTW, other members with PDK have indicated over revs so PDK is not a guarantee of zero over revs.

michaelp1usa

It shows 1 for each of R6, R5 and R4 all at exactly the same time, 2127.8 hours. The car is at 2134 hours and I know it never ran hard in the past few hundred hours.

Also, the PPI shows an odometer reading about 30k miles less than indicated.

Could all this happen from a dead battery?

WindyCityC2S

Weird over-rev counts and 30K missing from the odometer....Is this your car, or one you are looking at buying?

I would be nervous buying a car with an odometer "mis-alignment"

holden997

nothing to worry with rev 1 in ranges 4, 5, 6 BUT the 30k miles delta is a major concern.

jhbrennan

Dead battery won't affect DME. 2134 hours at an average of 30mph gives about 64,000 miles on the odo - is that close? With 3 ignitions per cycle I don't think you could get 1 ignition in all 3 rpm ranges.

michaelp1usa

Indeed, its my car.

A 2005 S owned the past 3 years (50k miles) with no problems, all service and warranty with authorized dealer.

Prospective buyer did a PPI at an independent shop and these showed up.

Its now at the authorized dealer to find out why.

I did not think a tiptronic could over rev at all.

A mystery to me and painful.

Thanks.

michaelp1usa

Odo is about 91k miles.

Not sure I understand your point about 3 ignitions per cycle, but it seems odd to me how to over rev in all 3 ranges at once.

dasams

He was referring to the three ignitions per engine revolution. For an R6 over rev, the engine has to pass through R4 and R5 on the way up and down. Hence, there's no way to get a single ignition in all three cycles. Dave

PasPar2

was the PPI done 30k miles back?!

PHX 911

My understanding is these reports detect the number of ignitions in a rpm range.
Since there are 6 ignitions in one revolution of the engine, you can get an idea of how long the engine was in that particular rpm range.
Also, you can't have an ignition in range 6 without having corresponding ignitions in lower ranges.
Having a single ignition in ranges 4-6 sounds like an analomy, but I'm not a Porsche mechanic.

jhbrennan

Only 3 ignitions each revolution.