woody6

Wanted to get some people's opinions on this. I'm shopping for an 07/08 997TT with the manual trans, and found what looks to be a well cared for car. The dealer nearest to the seller did a PPI for me because the car is not local to me, and I expressly asked for a DME report to look for overrevs above range 3. I have read that counts in range 1-3 are okay, a modest amound in 4 might be acceptable, and to avoid any car with numbers in the 5-6 ranges. Sure enough, this car has nothing in 5-6, and 554 (or about 1.2 seconds) in range 4, but it is the lower ranges that has me surprised:

Car ~36,000 miles
Hourmeter ~1200 hours

Range 1 65535 @ 1137.7h
Range 2 19126 @ 1113.0h
Range 3 2854 @ 1112.9h
Range 4 554 @ 1072.0h
Range 5 0
Range 6 0

Thoughts? 65,535 IS the limit of what the DME will record, and I have never seen numbers as high as this in range 1-2. Should I be concerned, or are the cars this bulletproof? All opinions appreciated.

--Woody

Kevin

It looks like this car has been tuned. Maxed out the Type 1 counter.. The Type 2's are a 1/3 of the way to getting maxed out. Typical numbers for a tuned '07..

If you are concerned buy a Fidelity or EasyCare warranty.

woody6

Thanks, Kevin. That makes sense, I take it the custom programming raises the rev limiter?

So would the tune still remain and not be picked up by Porsche during the overrev report? Or is it more likely the stock programming has been returned prior to the PPI?

--Woody

TT Surgeon

A tune with bumped RL will look just like that, the main thing is the 4-6 which are acceptable.
A given tune may or may not be discoverable, highly variable.

Igooz

Yes, 65535 is the maximum count on that counter = FFFF (HEX)

TT Surgeon

What's FFF hex?

LexVan

^some hexadecimal notation thingy.

TT Surgeon

^^ I'll stick to blood and guts

therock88

Not to sound like a smart @**....But the serious answer is the Hexadecimal number FFFF is equal to the Decimal number 65535.

Here is a brief explanation if it helps anyone....

DC

To Calculate Hexadecimal to Decimal

Hex is a base 16 number and decimal is a base 10 number. We need to know the decimal equivalent of every hex number digit. Here are the steps to convert hex to decimal:
◾Get the decimal equivalent of hex from table.
◾Multiply every digit with 16 power of digit location.
(zero based, 7DE: E location is 0, D location is 1 and the 7 location is 2)
◾Sum all the multipliers.


Hexadecimal = Decimal
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
A 10
B 11
C 12
D 13
E 14
F 15

TT Surgeon

Interesting, but why set up the timer with a max capacity, or some it just a function of the timer itself?
C

Kevin

It's the design spec. There are other functions that take up "space" in the memory. Everything has it's limitation/ fighting to fit the design/chipset..

therock88

As Kevin mentioned...Remember Y2K?? Save two digits (16 bits) ....until..oh crap the century turned..now what....haha

saabin

^ It's a function of the chipset used in the ECU.. I believe the 997.1 is Bosch based? Not sure if they built their own micro or licensed it from someone else

It's most likely a 16 bit microprocessor, so it uses 16 bits in NVRAM to store the ignition overrevs, hour counters, and the other myriad of variables.. The largest number that can be represented in 16 bits is 65535, and the programmers specifically stopped accumulating once they reached the max instead of rolling over and starting back at zero again.. Too bad..

If you have a Windoze computer you can open the calculator and pick the "Programmer" view.. You can then pick your base (HEX, binary, decimal, etc.) and easily convert between bases for fun..

WHo knows, maybe the Siemens 997.2 ECU is 32-bit based, so it can store up to 4294967295 ignitions.. LOL

996SPECticle

hmmmm... You think they will use that report or a worse one as a warranty denial?

Kevin

I have yet to see Fidelity or Easy Care refuse a legit warranty claim with a tuned ECU. Porsche has that right since they are offering the factory warranty. Go over to the 991 Turbo site and look at all the tuned 991 Turbo's under warranty.

How does the aftermarket warranty company know? The repair shop wants the job.

The company adjuster looks at the claim, looks at the failed components and authorizes the repair. In some cases you need to fork out the labor to tear apart the engine.