V225

Hi everyone,
Just got back from my local porsche mechanic, and he tells me that the computer's saying there have been numerous overrevs in the 200-400 rpm range, and one in the 800 rpm range on my '02 C4S. I am the original owner, and I know I have never missed a downshift on the car, so this is really bothering me. I do heel-toe quite a bit, and on track I might have blipped to redline, but surely not past it!

Would the rev limiter keep the car from overrevving during a blip?(I guess this is the same thing as revving the car in neutral).

Also, if I do overrev, will the tach actually show the rpm going above 7k? Because I have never observed this.

Should I be worried about this, and what action should I take?

Thanks!

BruceP

The ECU stores and distinguishes between two kinds of overrev conditions: The kind you get from shifting late, and "mechanical overrevs", the kind you get from, say, accidentally downshifting from fifth to second. Which kind is he saying you've done?

ivangene

type is the question as Bruce says... one is not so bad, one is not so good (can you guess which one)

himself

I have thousands of Type I's. I bounce off the rev limiter on occassion.

-td

rpm's S2

I once heard the story of a 996 turbo buyer who would not purchase a car without seeing the ECU overrev readout first. He quickly discovered that many of the 'new' cars on the lot already had overrevs - and that all of the new turbos had them.

Bruce is right... overrev on acceleratior or downshift?

Zookie

+1 mine would be in the Millions :P

V225

I think he said that there were many type 1's. He called them type 1000's and 2000's for some reason. He did say it registered an overrev of between 400-800, I'm guessing this could happen only through missing a downshift. I'll have to ask him about this on monday.

67FJ45

Range 1 is an overrev in the 7,300-7,500 rpm range (i.e., 0-200 rpm above redline). This range is often reached by hitting redline while accelerating. You should be able to accelerate and "bounce" your engine off the rev limiter with relative impunity.
Range 2 is an overrev above 7,500 rpm (i.e., >200 rpm above redline). Normally, acceleration to the redline will not achieve this rpm range, so it is typically caused by "money shifts," i.e., downshifts to gears too low to support safe engine speeds.
The ECU also provides cumulative hours the engine has been operational, as well as the engine's age when the last Range 1 and Range 2 ignitions took place. However, I don't think the PIWIS (ECU prober used by Porsche dealers) provides the last ignition age data.

It's difficult to figure out what your mechanic meant by overrev of between 400-800, as the 996 NA ECU wouldn't give that information. It just tells how many 0-200 rpm overrevs you have and how many overrevs above 200 rpm you have. Maybe he meant you have one Range 2 overrev.

Edgy01

Keep in mind that these things wind up quickly and the momentum of them can easily exceed the normal redline electronic cutoff. That's what you are seeing. I do that myself because I actually drive my car.

kristyhana

My mechanic's diagnostic tool did also show the mileage at the time of the last occurrence. Mine had 2 of those bad ones, lol.

LVDell

You need a copy of that printout. The 996 does not have discrete channels for recording which rpm load registered the over rev. Just Type 1 and Type 2. You need to look at the printout and see what the number is for each and report back. The printout will also show the number of hours on the car and the hour at which the last over rev was recorded.