600V

Hi all, I'm getting a PPI done on a 2009 C2 that I'm trying to buy. The indy shop sent me this report which looks good I think??? Just looking for some advice.

https://rennlist.com/forums/attachme...1&d=1559932751

jamesinger

I thought this was a solid tutorial
I personally just did the math myself.
so, I kind of just broke down the math in my head but IDK if this makes sense to others.
I did cross reference the numbers I got and they are consistent.
If this is not a good way of calculating this in line with the @switchcars tutorial, please correct me:
(Calculating the period of TIME that a car has spent at or above the rev limiter).



997 C2S with a rev range 1 threshold of 7200rpm (conservatively):


[How this was calculated:

Number of ignitions / 3 = number of engine revolutions

Number of revolutions / 7200 = minutes spent at limiter

Minutes spent at limiter x 60 = seconds spent at limiter].

600V

Thanks for the reply. Just from everything I've been reading, the engine's last over rev at range 4 was almost 450 hrs. ago. Just heard from the indy shop and the borescope came back clean.

8Lug

Looks fine to me. Ranges 1-3 are not a concern and you only have a blip in range 4.

MexicoBlueTurboS

I see you're in Nova Scotia - you should read the buyers guide (it's a sticky top of the 997 forum) and inquire to others about the best warm up procedure for cold climates.

There is a lot of good help in these forums.

I think you're on the right track with the 3.6

doclouie

That is a clean rev report. Don’t think twice about it and if there is no bore scoring double win.

sandwedge

Looks pretty good. The only reservation I might have is if resale or trade in with a Porsche dealer may be a future consideration. I don't know if this is accurate but I read here or somewhere that Porsche can't CPO a car that has anything in range 4, no matter how small. Blip.....call it what you want but anything registered in range 4 is disqualifying for CPO certification according to what I read. If correct, how much if anything that affects the value of the car can probably be debated forever.

Petza914

Looks ok to me too. Average speed was 47 mph which means probably a lot of highway mileage. Total mileage divided by total operating hours.

12 hours ago it was being driven spiritedly, but that's OK and the missed shift that caused the range 4 was a few hundred hours ago. If boroscope was clean you're probably good.

600V

Hey thanks for all the help folks. I found out from the shop that the car was winter driven as well. Still has the winter tires on it actually. Would this also be something to be concerned with? keeping in mind it's a Canadian car so it would have likely been driven in snow.

600V

Also heard back from the Indy shop. There is no sign of bore scoring so looks like the engine should be in good shape.

600V

Thanks, the borescope came back clean

600V

If I understand correctly Porsche has "relaxed" their rules on range 4.

Petza914

Personally, I don't ever want to work on a car again that was driven in the winter where all the fasteners are corroded, rusted in place, snap off, need extracting, etc so it would stop me from buying a particular car, but if you're going to have others do most of your wrenching, it will be their problem, and up in that area, I'd assume they'd be used to it.

MexicoBlueTurboS

It's amazing how much damage salt and all of the other chemicals used to treat snow can damage a car and how quickly. After looking at the undercarriage of some cars from the snow (and salt) belt, I would never consider any of them. When I went to change the oil on my car the other day, it was nice to see approximately this (previous photo but a little dirtier at this time).

MexicoBlueTurboS

That's a very high avg in my limited experience. Usually under 30 if I recall correctly.