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YOUR RESEARCHReading cars computer to see rev history ect
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Use on most cars
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I have a friend that is a mechanic so he would have the diagnostic tools used on most cars.
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I am curious after seeing this discussed as to the history of my car when it comes to pushing the rev limits .
How do I download this info?
I have a friend that is a mechanic so he would have the diagnostic tools used on most cars. Is this something that would require a reader that is Porsche specific?
Does the 996 have a rev limiter built in to prevent over-reving? I've always assumed it does, but never rev high enough to hit it if it does exist. Even if it has one, I guess it would still be possible to overrev with an inappropriate downshift.
Yes and yes. My understanding is:
Type 1 = you hit the rev limiter. These are pretty common and generally nothing to worry about. Type 2 = the rev limiter was exceeded, probably due to an overly aggressive downshift. These can cause engine failure and are not good to see.
When I received my durametric I checked and my car had several hundred type 1 and I believe 2 type 2s. However, I've owned it for a year and seen nothing to indicate the engine was damaged by the type 2s, so just because they're there doesn't necessarily mean anything bad happened. But it would be logical to assume that a car with a lot of type 2s has been driven very hard.
My track car has 65535 Rev 1's which is the max amount the ECU counts to. So there is no telling how many it really has.
It has 820 Rev 2's but has not shown any issues from them. I did a money shift last year but as soon as the revs started increasing I jammed the clutch back in and caught it. The wheels didn't lock or anything. That incident took Rev 2's from 680 to the current 820.
Ah, I didn't know this. So the counter isn't necessarily the number of times the rev limiter was hit but more the number of revolutions the engine went through in that state? Or possibly the number of ECU cycle refreshes in the over rev state?
Rev 2 counter - revolutions of the crank over rev limiter. So per the example 820-680=140 revolutions of the engine. At 7.250 RPM divided by 140 and divided by 60 is 0.86 seconds...happens fast if you money shift the car.
It was actually shorter than your calc. The 140 isn't number of revolutions but number of ignitions so with 3 ignitions per revolution you were actually in range 2 for 0.386 seconds (7250 divided by 60 times 3 = 362.5 ignitions per second. Divide your 140 ignitions by 362.5 = 0.386)
Mathematics kicks ***. Ignitions is what I read on the interwebs as well.
My c2 had 4300 type 1s and zippy type 2s @ 71,500 miles when I bought it. Haven't been successful in trying to figure out how to find the data in my OBDII scanner... right tool for the right job or some such nonsense seems to be the issue there.
^^^ this is precisely correct, numbers in the overrev counter are for ignitions, also FYI the 996's have 2 ranges, 997+ has 6 ranges, range 4= engine damage may have occurred, range 5= engine damage has probably occurred, range 6= engine damage has occurred, that's the description of the RPM ranges which the actual RPM range is dependent on engine variation as some have higher rev limits/ red line ie GT3's.
The overrev counter and engine hours data can only be accessed by Porsche specific equipment ie Durametric, PST2, PIWIS, PIWIS I, PIWIS II
Well, darn it, that's what I get for shooting from the hip. In the back of my mind I was thinking "too rudimentary...I know there is something else to this". I stand corrected. But still..a money shift is a money shift and it can happen in a split second...that was my point.
FWIW Porsche states that if the over rev type one or two occurred more than 150 hours ago you are in the clear in regards to engine damage.
Whether or not that's true now im not sure especially as 996s get older.
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