tiiger

Looking at what seems to be a really nice 2010 Cayman S. Seller mentioned there were some over-revs, so i had him send me the report/data.

Noticing over-revs in zones 5 & 6, which seems bad. But maybe I don't know how to read these things.

An oil report also was done, and in the summary, they say "no concerns" on that front.

PPI is scheduled, but I'm guessing over-rev issues aren't something they can really delve into on that.

Thoughts?

KrisA

Lots of other fish in the sea. Unless this car is a smoking deal I'd move on.

tiiger

Wow, interesting. It seems really nice, but it's my first porsche, and my first experience with an over-rev report.

Are there tests to determine whether damage has been done?

It's not a smoking deal, but these days there seem to be few of those.

Kitc2246

Is this at a dealer or private? The range 1 and 2 are only nine hours before the PPI. Who had the car? The other really, really bad over run was 114 hours ago, all during the same rev. Did some "crazy" test drive the vehicle? If I remember how this works, 6 ignitions per rev, so only 66 revs. Range 6 revs are considered walk away. If this had happened a long, long time ago would be less of a concern. Hopefully others with more experience can comment on the length of the 4-6 over revs.

tiiger

Private party.

This might have been a test before he bought the car; he's only put 1000 miles or so on it.

Yeah, the bad one is 114 hours before that.

That's what I understood too about Range 6. Bad.

I'm getting the PPI done in a couple of weeks. Soonest it can happen. Can they tell much during the PPI about this?

hueyhoolihan

you need to specify PDK or not. if PDK the report is to be ignored by service personnel according to the company itself. if manual, porsche will not CPO a car with anything above a 3.

this is important information that took about two minutes of googling to find...

tiiger

yah thanks I've read things to that effect, but CPO (certified pre owned, yes?) isn't really relevant as it's a private seller and a 13-year-old car. Or maybe I'm not smelling what you're cooking.

It's a manual, not PDK.

plafondles

That is what we call a money shift. It's a gamble and up to you, but personal I would keep looking as that would always be in the back of my mind. PPI wont tell you much about internal damage unless they perform an oil change to look for metal or notice smoking or leaking and even if things looks okay, you still wont know what damage was done unless you breakdown the engine.

tiiger

Yeah, sounds like the seller was told by the previous owner it was an errant 5 > 2 downshift exiting a freeway. Scary as hell, i would imagine, but not a sign the car was "abused."

But I get what you're saying. It would definitely be on my mind, and it would be a factor for any buyer down the road if/when I sold it.

Like I mentioned, the current owner had a Blackstone oil analysis done before he bought it that showed no issues, FWIW.



Just for the sake of argument, how much does a range 6 over-rev reduce the value of the car for you, all things being equal? (Engine rebuild might take care of mechanicals, etc... but the ECU will ALWAYS show the over-rev.)

ekam

The fact that someone can shift from 5th to 2nd in error makes me wonder what other damage that person has done to the vehicle.

It's like wild west out there in the used car market.

cmassler

What 'tool' does one need to obtain and print an over-rev report?

tiiger

screenshot says "siemens digital motor electronics SDI3" and looks like it's from a windows computer, perhaps with a cable/scanner plugged into OBDII port

I think there are handheld scanners that can do the same thing.

Foxwell:

https://www.foxwelldiag.com/products...ll-nt650-elite

TMc993

Using the lower limit of each range:
Range 1 - @ 7200 RPM each revolution lasts 0.00833 seconds, so the car has spent no more than 330.5 seconds in Range 1
Range 2 - @ 7500 RPM each revolution lasts 0.008 seconds, so the car has spent no more than 10.35 seconds in Range 2.
Range 3 - @ 7700 RPM each revolution lasts 0.00779 seconds, so the car has spent no more that 0.5922 seconds in Range 3.
Range 4 - @ 7900 RPM each revolution lasts 0.00759 seconds, so the car has spent no more than 1.2911 seconds in Range 4.
Range 5 - @ 8400 RPM each revolution lasts 0.00714 seconds, so the car has spent no more than 0.7857 seconds in Range 5
Range 6 - @ 9500 RPM each revolution lasts 0.00632 seconds, so the car has spent no more than 0.2526 seconds in Range 6.

Looking at the report it appears that the car hit Range 3, 4, 5, and 6 at the same point in time (975.11 hours), which would indicate to me that someone made one pretty hard run either up or down through the gears and triggered those "hits" in Range 3,4,5 and 6.

Also the frequency of Range 1 "hits" could have been caused by the rev limiter and not necessarily over-revving the car via downshifts.

I'm sure someone will inform me if my math is incorrect..

Zach L

While there is evidence of a "money shift", it's been more than 100 hours since that occurred. The only thing to occur in the last 100 hours is Range 1 and 2, which are insignificant IMO.

Rather than go elsewhere, I'd just use the DME report to get a better deal on the car. Cars like this are opportunities since so many potential buyers run when it's not necessary. The 987.2 is an extremely stout/reliable engine.

tiiger

weird that the range 3 hit is shorter duration than 4, 5 & 6. Seems you'd need to go through 3 to get to the others, but maybe it's not as logical as that.