997 C2S Rev limit failure

[Lunne]

Hi
Just had a OPC 111 point check completed on a 997 C2S (2005 19k miles) prior to purchase. It has failed on a over rev category 5. (plus a few other items - air con, ignition coil)
I have just read previous threads on the over rev categories and concerns however I cannot find any reference to how this occurs with a tiptronic gear box. Surely like other 'automatic' cars I have owned the gear box manages such over revs automatically?? Porsche will offer a warranty but only after they have verified all is okay following a £500+ pressure test.
Any guidance or comments welcomed

Thanks

[James McScotty]

Not possible to over-rev a tip, or so I was told by OPC.

[DSM2]

V difficult to understand how that could happen but I'm sure OPC, being experts, could explain?

[Callughan]

I think it happens when say your doing 90mph in 4th and then you accidently select 2nd when downshiifting.

[markmullen]

Callughan said:

I think it happens when say your doing 90mph in 4th and then you accidently select 2nd when downshiifting.

Impossible in a tip, you can hammer the buttons to your heart's content, it won't change beyond what it deems reasonable.

[Callughan]

markmullen said:

Callughan said:

I think it happens when say your doing 90mph in 4th and then you accidently select 2nd when downshiifting.

Impossible in a tip, you can hammer the buttons to your heart's content, it won't change beyond what it deems reasonable.

I've seen it first hand when it will go into gear then bounce into the next

[markmullen]

On demoing a tip I'll get customers to try and select an inappropriate gear, to prove the car won't let them. Similarly I'll get them to pull up at a junction in manual mode without changing down to show that the car will drop back to second to pull away. Never have I seen it let an inadvisable change go through, in hundreds of different cars.

[Jim1556]

markmullen said:

Impossible in a tip, you can hammer the buttons to your heart's content, it won't change beyond what it deems reasonable.

Then how do you explain the OP's predicament?

[fioran0]

To the OP, if you have the over rev info post up the ignitions shown for each stage. It's perfectly possible that you have glitches/errors recorded up there giving a false positive.

[noumenon]

What would happen if you were accelerating hard downhill in first and the rears suddenly lost traction (say due to oil or ice). Could the sudden lack of resistance cause the overrev, despite no fuel being injected beyond the rev limit?

[supermono]

noumenon said:

What would happen if you were accelerating hard downhill in first and the rears suddenly lost traction (say due to oil or ice). Could the sudden lack of resistance cause the overrev, despite no fuel being injected beyond the rev limit?

Not according to the laws of physics. It's like saying if you throw a ball really hard, I mean really, really hard and flick your wrist just as you let go, it'll accelerate for a little while after it's left your hand.

SM

[nsm3]

Jim1556 said:

markmullen said:

Impossible in a tip, you can hammer the buttons to your heart's content, it won't change beyond what it deems reasonable.

Then how do you explain the OP's predicament?

OPC trying to raise 500 quids worth of work for their workshop?

[supermono]

My OPC reported a spurious overrev one warranty renewal causing them to do a compression test before declaring all was well and I categorically have never caused a mechanical overrev. Naturally I occasionally encounter the soft revlimit though.

I'm convinced that the ECU glitches and recods the occasional spark or two at levels out of normal reach.

SM

[GBR1]

I am sure most here are correct, I was also told it was impossible to over rev a tiptronic or PDK box.

BUT, what I cant believe is that Porsche want to charge the OP for a pressure test on what is still their car, "if" there is an issue the OP will surly walk away anyway!!??

[khushy]

must be a false reading!

[supermono]

GBR1 said:

I am sure most here are correct, I was also told it was impossible to over rev a tiptronic or PDK box.

BUT, what I cant believe is that Porsche want to charge the OP for a pressure test on what is still their car, "if" there is an issue the OP will surly walk away anyway!!??

Agreed. To be fair the car either protects against overrev in slushbox config meaning this is false or it doesn't meaning it's a design issue. Either way the owner isn't to blame and this work should be covered under existing warranty.

SM

[Greenslade]

[quote=Lunne]Hi
Porsche will offer a warranty but only after they have verified all is okay following a £500+ pressure test.
Any guidance or comments welcomed


yes its £500 at their cost !

[Diesel130]

Lunne said:

Any guidance or comments welcomed

Thanks

Walk away. There are loads of these cars around. Even if it checks out OK, what happens when you come to sell the car? The prospective purchaser will have a check done, see the level 5 overrev and walk away. Similarly, if you try to sell it to a reputable indi, they will do the same.

[mrdemon]

THE QUESTION IS HOW MANY IN OVER REV 5 ?

[Lunne]

Hi
I am told it is only one incident, but OPC are insistent that they need £584. Sadly i don't trust the process and sense Porsche are looking to generate extra revenue. The car is great and so I don't want to walk away but I also acknowledge that if I am nervous, so would any future prospective buyer. Saying that OPC say that if there are no issues they will add notes to their system which could be referenced in the future. The other issue is that my current car has been sold and will be collected tonight - I will be car less!!!
Many thanks for all your comments!