GT3 Gen one rev range check for warranty

[toohuge]

Is it just me, or are Porsche 911's easy to over rev?

It seems odd that so many have over rev registrations - is this sole down to driver input? Or are there other factors that make over revving these engines very common?

Chris

[LaSource]

More like all sports cars have them. Porsche happens to log them in the ECU.
Autos and PDKs reduce the risk. But you can still get them.
Most of us are probably driving over revved BMWs, Fezzas, Fords, etc
Most Fezzas have suspiciously low mileage too because of no ECU logging of mileage and engine hours.

[Chipwizard]

Looking into this and it appears that the table above refers to DBW ME7 equipped cars, but the cable throttle cars rr1 is just hitting the limiter and is triggered by the limiter routine becoming active. Rr2 is over the limiter's control range.

It appears that these people can fix corrupted data, zero data for new engine installs etc for a clean slate to go with a fresh engine.

www.ecu.guru

[Shewie]

Chipwizard said:

It appears that these people can fix corrupted data, zero data for new engine installs etc for a clean slate to go with a fresh engine.

www.ecu.guru

Doesn't this just make a mockery of the whole debate? I assume the carefully worded reasons for using this service allow them to operate within the law. However, is this not akin to "mileage correction" as both appear to allow an owner to knowingly mislead a potential buyer? Or is ECU manipulation fair game? Caveat emptor and all that!

[S1MMA]

Shewie said:

Chipwizard said:

It appears that these people can fix corrupted data, zero data for new engine installs etc for a clean slate to go with a fresh engine.

www.ecu.guru

Doesn't this just make a mockery of the whole debate? I assume the carefully worded reasons for using this service allow them to operate within the law. However, is this not akin to "mileage correction" as both appear to allow an owner to knowingly mislead a potential buyer? Or is ECU manipulation fair game? Caveat emptor and all that!

Game, set, and match. But can the chap resetting the values guarantee that a Porsche dealer OR Porsche headquarters could tell if it's been altered?

[berty37]

Every time an ECU or DME is changed or re-mapped it creates another count on the cars brain that simply cannot be wiped - even for example if you decide to put on an after market exhaust and it has to be flashed. If you then return the car's ECU back to its original settings then it will create this count again. Ken Napier at 9e is the real expert here as he is pretty much the king on re-mapping and all that stuff and he told me programmes that try to wipe off corrupted ECU data also leave a mark - not easy to spot first off but detectable if you know what you are looking for.

[Digga]

MrTickle said:

I think a GT3 redline is 8400rpm, so unlikely a bump into limiter will cause RR1

The turbo has an 6750rpm redline and RR1 @ 6800rpm, so I believe RR1 is possible without a mis-gear.

I think there's a difference in the internals between GT3 and Turbo (certaionly on 996) with things like Ti con-roads on the former, allowing it to (safely) rev higher. A concern with the 996tt is that over-rev in rannge 2 could mean 'anything'; a mapped car merely hitting a (raissed to 7,250rpm) limiter, or 9,000 od revs on a badly ballsed-up downshift.

I like the scrutiny the 997 ranges bring.

berty37 said:

Every time an ECU or DME is changed or re-mapped it creates another count on the cars brain that simply cannot be wiped - even for example if you decide to put on an after market exhaust and it has to be flashed. If you then return the car's ECU back to its original settings then it will create this count again. Ken Napier at 9e is the real expert here as he is pretty much the king on re-mapping and all that stuff and he told me programmes that try to wipe off corrupted ECU data also leave a mark - not easy to spot first off but detectable if you know what you are looking for.

IMO, anything is hackable - certainly enough to fool a buyer and possibly even a laptop plug-in PPI. On a 996, I'd always be suspicious of an older car without 65,555 ignitions in range 1.

[Chipwizard]

Any of the DME memory contents (across four devices in total) can be edited with appropriate equipment and software such that no evidence remains of any changes at all. The reason people often believe otherwise is that most reflashing equipment, including Porsche's own, either leaves a signature or adds an increment to the 'flash counter' when writing.

The main reason people say Porsche 'can tell' that the data has been altered is because it was either not done properly or completely. The difficulty most often lies with the checksum components, it's easy enough changing the variables themselves but if the checksums aren't right the job won't be right and people with the kit to see it can do.

I agree with some posts above in that very few engine failures are caused by revs in Porsche engines, but the sad truth is that most warranty companies use this data just as a cheap and easy way out of paying for a completely legitimate claim, and knowing that is what worries buyers, not the fact that the engine may have been revved a bit in its life. Very very few other manufacturers record data in this way, and it's just being used as a cop-out mostly these days by warranty companies and car dealers not wanting to pay for common failures that are not rev related. IMS bearings, liners cracking, bore scoring, breather issues, chain failures etc etc.