Hi guys,

Just sent a 996TT Cab through PPI.
The dealer (Champion Porsche) gave the car a clean bill of health.
Here's the read out as it relates to the DME section. Can anybody help me understand ? Where do I see the critical over revs ?

Thanks !

 

Where it says

"Number of ignitions, range 1" = 8436

and

"Number of ignitions, range 2" = 16

these are totally acceptable to me. Some people would say ANY type 2's are unacceptable, but my car has thousands and runs fine.

 

Thanks.
What's the difference between range 1 and 2 ?

 

It looks tlike there were 450.1 hours on the motor... and the last Type 1 was at 315.1 hours and 444.5 hours. The further in the 'distance' they are, the less concerning they should be. (If you figure average speed by taking the current mileage and dividing by 450, you can then figure out roughly how many miles ago the last overrev occurred.


These are very low in count.

Type 1 is a minor overrev, type 2 is more significant. I think type 1 is less that 7k and type 2 is over 7k? Something like that.

Mine had 0 type 2s when I bought it...I haven't looked since!

A

 

The numbers indicate the number of ignitions beyond a certain rev limit. Type 1's occur above 6750 rpms.. so if you put it in neutral and floor it, the rev limiter will kick in, but you'll like go just past this and register a few type 1's. No big deal. Your car saw 8,436 of them which is not bad - any real turbo driver will do this if he drives his car correctly My car has something like 30,000 of them.

Type 2's occur by mechanically over revving the engine. Say from shifting from 3rd to 2nd prematurely.. or from accelerating downhill beyond redline. I believe the magic number is 7250, but other may argue that point (it may be 7000). Type 2's are how many ignitions occurred above this limit. In any case, 16 ignitions means all 6 cylinders fired two and half times. at 7250rpms, that's just a split second.

It wouldn't concern me at all. There are some members here who claim to have raised the rev limit on their cars to 7250 with no engine modifications and no problems. Personally I wouldn't drive around at 7,000rpms all day, but supposeduly (according to my mechanic) you can.

 

from RennTech

The 997-1 DME records the following rev ranges:
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

 

The ranges stated above are for 997-1 and they have nothing in common with 996TT...Go to durametric website to find useful infoo about rev ranges on EACH model...Also if somebody raises rev limit and just accelerate to raised rev limit ign 1 will occur and probably ign2 range...These were not made due to downshifts so there is no need to worry...