speedyralph

This report is off a 2006 997.1. Carerra with 67k miles on the clock. Any Feed back would be great. Thank you

speedyralph

Any feedback would be great guys, thanks

mattyf

The 4 and 5 over revs happened about 30k miles ago. So if the car is running fine now I wouldn't sweat it. I would try and use it to negotiate if possible.

ZX9RCAM

I have never seen a read out before.
How does it show it was about 30k miles ago.

speedyralph

Thanks mattyf. Anyone else have any input on this report? Help me decide if I should go for this 997! Thanks guys

Wolfk

Car has 67000 miles on odometer, engine has run 2735 hrs.
67000/2735 = 24.5 mph. This is the average speed of the car during its life.
over rev occurred at 1491 hrs.
1491 X 24.5 = 36530 miles when over-rev occurred.
67000 - 36530 = 30470 miles ago when over-rev occurred, which is approx. 30k ago like Mattyf said.

I would consider an average speed of 24.5 mph indicates around town use or traffic use. Possibly with a lot of clutch wear if car has a manual trans.

speedyralph

Thanks for your explanation on that wolfk. The car is in mint condition. Sounds great and drives smooth.

MessyMarvin

What he said, to me 24.5 MPH is very low meaning it probably does not have much Highway use. Most I looked at averaged over 30MPH. I also agree the bad over-rev was so long ago it should be OK now. To me it would depend on the deal, there are so many cars out there.

Spiffyjiff

R5 is probably a fluke (i think there are threads here/on the GT forum somewhere about how ranges with "1" are phantoms, i've even seen a printout with 1 in ranges 3, 4, and 5. this is an impossibility). and barring the possibility that the prior owner was an overzealous teen who screeched away from every stoplight, i'd say the car has definitely been tracked and looks like maybe a missed shift at 1491hrs. either way, if it drives fine, if a PPO checks out, and if the price is right, go for it.

gota911

The DME records the total number of ignitions (cumulative) in following rev ranges for a 997.1:

Range 1: 7300-7500 RPM
Range 2: 7500-7700 RPM
Range 3: 7700-7900 RPM
Range 4: 7900-8400 RPM
Range 5: 8400-9500 RPM
Range 6: 9500-11000 RPM

At 7200 RPM / 60 seconds per minute, you get 120 revolutions per second X 3 ignitions per revolution equals 360 ignitions per second.

The "h" (hours) are the last time (recorded in "engine hours") that revs occurred in each Range.

Based on the info you supplied, this car has spent the following time in each rev range, assuming the midpoint of each range as the actual RPM.

Range 1 - 8,073 ignitions / 370 per second = a total of 21.82 seconds in this Range
Range 2 - 2,223 ignitions / 380 per second = a total of 5.85 seconds in this Range
Range 3 - 704 ignitions / 390 per second = a total of 1.81 seconds in this Range
Range 4 - 45 ignitions / 408 per second = a total of 0.11 seconds in this Range

As others have stated earlier, since the over revs in Range 4 occurred some 30K miles ago, these numbers, in my opinion, are not bad. It does appear that the previous owner liked to bang off the rev-limiter and did so quite often, which explains the number of revs in Ranges 1 and 2.

ZX9RCAM

Thanks for the explanations, all!

Spiffyjiff

and FWIW, i've heard from a couple different (reliable) sources that it's the sudden spin up that is the root cause of damage. point being, that these engines can take higher revs. maybe not all the way to R6 but def past redline. of course, i'm no engineer, i'm just passing along what i've found out over the years.

USMC_DS1

+1... good that it's been so long since those hits in the upper R3-R4 range. I assume that the car is out of warranty. Otherwise Porsche could use the fits in R3 and above to push back re warranty coverage on the engine.

rsabeebe

it's nice to see some reasonable responses to this DME readout. i see so many posts that say avoid any car with anything in the 4, 5 and 6 range. my readout looks very similar to this one - i have some in the 4 and a '1' in the 5 range (R5 likely an anomaly). a compression test on my engine revealed almost identical numbers for all cylinders - i could get the exact numbers, if someone was curious - and the range 4 hits were many miles ago. the shop said if the car has this type of compression after this many miles from the range 4 hits, you should be fine. the 'should' was obviously a way to reduce liability if something did happen. they basically told me the engine was running great and don't worry, if you really want this car. no issues since and the car runs like a top. my car has seen some track time and autox use with previous owners and i was fine with that. i don't baby my car, so i didn't need a spotless DME report. just consider what the numbers are saying and when they happened - not all cars with something above 'R3' should be walked away from. if anything, use it as a bargaining tool. good luck.

speedyralph

Thank you all for your support and helpful responses!