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Would you buy this car? (over-rev data)

ScotDoc

ScotDoc

New member
Hi all,

I am looking at a 997 turbo with 38k miles on the clock. Here are the results of the DME download over-rev data:

Total engine operating hours = 436 hrs

1 @ 408hrs 4591
2 @ 402hrs 609
3 @ 332hrs 89
4 @ 59hrs 26
5 = zero over-revs
6 = zero over-revs

Could anyone give me some expert advice here? It would appear that it requires a compression test. It has hardly done any miles since it's oil change with the current seller, so I guess that would mean that oil analysis would have little value? Would you buy it or not? The dealer is offering a warranty, which covers the engine, for 6 months, but I will only be doing around 500-1000 miles per year in it.

Many thanks for your help.
 
Yes thanks indeed. I did think the hours were rather short. Raises the concern about whether it's been thrashed round a track on a regular basis.

By my calculations, it's run at 13.5 seconds in range 1 alone. Seems like a lot to me.

Any further comments anyone?
 
Am no expert at interpreting this info, but is it right to assume that the Range 4 overrev occurred at 59 hours (ie. fairly early in the cars life ?). However, the range 4 indicates only 26 ignitions which isn’t too many ?

IIRC, ranges 5+6 were the ones that made warranty ineligible ? So you could take comfort that the over revs have only occurred in ranges 1-4 and recently only in 1/2 ?


 
A further thought re the miles/hours, the ECU/DME coding date should be viewable by whatever system produced the overrevs report. Obviously the coding date should predate the first registration date by a month or so. It may be that it has a new ECU?
 
ralphmusic said:
A further thought re the miles/hours, the ECU/DME coding date should be viewable by whatever system produced the overrevs report. Obviously the coding date should predate the first registration date by a month or so. It may be that it has a new ECU?
Click to expand...


Yes I wondered if it may have a new ECU. It is being sold by a dealer, who is not an OPC or a Porsche specialist. It has just had a PPI at a Porsche Centre in the UK. I will ring them tomorrow & ask if the DME has been changed.
 
Sometimes, cars outside the specialist network are a bargain. Sometimes the cars are not being sold by specialists as none of them wanted it.
 
Personally, I would walk away if it's not an OPC or specialist. As Jo mentioned above, the specialists probably wouldn't touch it if there was any doubt.
 
I perform these tests very often - probably once a day (during a service).

The guidance I give a customer is that for a manual car I expect to see 5-20k ignitions in range 1 for a 60k, manual car (probably more for a car like this). The lower end indicates gentle driving and the upper end more enthusiastic driving. I rarely see numbers lower, but more likely higher, occasionally see 65k - which is the max counter value.

I then expect to see an exponential decay in higher ranges. Numbers in range 5 and 6 are a concern, especially if they have a recent time stamp.

Overall I think the numbers are good (for a manual Turbo) - but the operating hours would suggest this car has had a new ECU about 15k miles ago. Most cars average 30mph +- 15%. It should have about 1200 hrs.

Overall, for such a big outlay I would get an independent inspection at a Porsche specialist.

Kind Regards Lee
 
Thanks Lee. It's at the OPC currently, and they did the PPI and DME download. I plan to ring them this morning to discuss. I'll let you know what they say.
 
Scott, one option with the OPC is to ask if they would sell you a warranty for the car based on this data? If they will sell a used warranty on the car with this overrev data then you can be fairly happy. Of course you will need to own it for 90 days before they will warrant the car. You should also bear in mind that this car with this data will be harder to sell to some buyers, reducing your market size when you come to sell.
 
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