Steve Theodore

Hey guys,

This is a related thread to the one about the PCCBs on the car I had inspected today at Sonnen Porsche, but different enough I'd rather start a new thread to keep it clear. Here are the actual DME scan results from the car, which has 58,900 miles today:

Range 1
Number of ignitions at speed>maximum speed - 315
Operating hours counter reading at overspeed - 1597.600

Range 2
Number of ignitions at speed>maximum speed - 32
Operating hours counter reading at overspeed - 1597.600

Range 3
Number of ignitions at speed>maximum speed - 1
Operating hours counter reading at overspeed - 759.900

Range 4
Number of ignitions at speed>maximum speed - 1
Operating hours counter reading at overspeed - 759.900

Range 5
Number of ignitions at speed>maximum speed - 0
Operating hours counter reading at overspeed - 0.000

Range 6
Number of ignitions at speed>maximum speed - 0
Operating hours counter reading at overspeed - 0.000

The dealership was not concerned at all with this result on a GT3 and said it was actually quite good considering how many miles the car has. Thoughts?

Thanks!

911SLOW

Excellent indeed

dantzig

1 ignition in range 3/4, and it was 800 hours ago. It wouldn't worry me.

With that many miles, I would be worried about a clutch though.

Didn't you used to have a turbo? I thought I recognized the name from the 996 turbo forums.

Jon

Steve Theodore

Jon, this is the replacement for the 996TT, which I still own. The car in question had a new clutch installed at 32k miles. Thanks!

Spiffyjiff

the "1" in R4 is a fluke, no? there's no way there can be only one (highlander!) in R4 and only one in R3. i.e. R3 would have had to register overrevs on the way up and back down, etc. i'd be willing to bet the 1 in R3 is a fluke also. an obd glitch.

Steve Theodore

Spiffyjiff,

Although I am certainly no expert whatsoever, I interpret that to mean that there was a single over-rev event that went through both range 3 and ended up in range 4 at the same time, meaning at 759.900 operating hours. That was the only over-rev that went that high, and it was the same event.

Spiffyjiff

i'm def no expert either but from what i gather here and over on the 997 forum,

the ranges correspond to RPMs over redline:

RANGE 1: 8,400 -1 ... to 9,200 -1
⇒ Maximum permitted engine speed exceeded; engine damage possible.
RANGE 2: 9,200 -1 ... to 9,400 -1
⇒ Maximum permitted engine speed exceeded; engine damage possible.
RANGE 3: 9,400 -1 ... to 9,600 -1
⇒ Maximum permitted engine speed exceeded; engine damage possible.
RANGE 4: 9,600 -1 ... to 10,000 -1
⇒ Maximum permitted engine speed clearly exceeded; engine damage probable.
RANGE 5: 10,000 -1 ... to 11,000 -1
⇒ Maximum permitted engine speed very clearly exceeded; engine damage very probable.
RANGE 6: over 11,000 -1
⇒ Engine damage has generally occurred

the overrevs are ignitions, and there are 3 ignitions per revolution. so for 1 ignition at R4, you are talking about ~.002 of a second (9800RPM / 60sec = 164 revolutions per sec * 3 = 492 igitions per sec. 1 ignition / 492 = .002 sec.) BUT, to get to R4 the engine spins up thru and back down thru R3 which means more time in R3 which means it should be more than 1. make sense? can anyone else back me up (or tell me i'm an idiot)?

M3EvoBR

common sense tells me you're right.

911SLOW

I have posted about this before.
1 means zero. It's a DME caprice also found in the 2-range reports of the 996 series.

Steve Theodore

Hey thanks guys! I appreciate the extra feedback, and now I feel even better about the results too.

P_collector

Hi Spiffy,

thanks..good post. Would agree..1 at 4 is nothing.

Since your so good in the math, Ill give you another example. A friend of mine has a 997 GT2 with 1x in range 6, and 3x in range 5..now my question: can this logically be the case? I would expect that if one at six has occured..there must have been more at 5..

I know that Porsche guidelines say that 1x ignition in every range can ignored. The car has 60,000miles..and overev occurred when it had 30,000 miles. A few weeks ago the compression has been tested again..max loss is 4%...

thanks,

PS: this one ignition at 6 is happening to quite a lot of 997 GTs...

dantzig

I sold mine. There was constantly something wrong with it. Transmission was the last straw.

You'll love the GT3. Yeah, I'm down almost 100 hp from my modded turbo, but I've had two track events now with zero wrenching on the car. Zero. I had forgotten what that was like.

Good luck!

Jon

P_collector

No Mathematician´s here?

thanks...

Spiffyjiff

whoops just saw this. altho i dont understand your question cuz it seems like you already answered it sort of - yes, the 1x R6 is a fluke. and yes it's possible to get 3x R5. rare, as it's only a fraction of a second but it does denote a full revolution so i guess it's possible.

P_collector

Hi spiffy,

Thanks..well yes..my "stomach feeling" tells me that 3@5 and 1@6 and can logically not be possible..thats why I asked for your math skills to prove it by the same formula you used above..

thanks anyway..