I scanned for over-revs... here are results, what u guys think?
#1
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So, while doing my oil, filter, brake service I had them scan for over-revs, here are the results:
Range 1: 3691
Range 2: 949
Range 3: 79
Range 4: 4
Range 5: 0
Range 6: 0
It looks ok I guess, but shows I drive to the redline quite a bit
Should I be worried about that 4 iginitions in range 4 (for warranty purposes)?
Range 1: 3691
Range 2: 949
Range 3: 79
Range 4: 4
Range 5: 0
Range 6: 0
It looks ok I guess, but shows I drive to the redline quite a bit
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Should I be worried about that 4 iginitions in range 4 (for warranty purposes)?
Last edited by alexb76; 06-10-2011 at 01:22 AM.
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What time (engine hours) was the last ignition in each range? If the Range 4 was a while ago (i.e. not yesterday), then you probably have nothing to worry about. I wouldn't worry about it.
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So, these numbers are the result of you just hitting the rev limiter? I recently had a conversation with my service advisor on this subject and according to him, you should only be getting range 1 and very few ignitions in range 2 when hitting the limiter.
If you are getting range 4, then the limiter is not doing what it's supposed to do, protect the engine.
If you are getting range 4, then the limiter is not doing what it's supposed to do, protect the engine.
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So, these numbers are the result of you just hitting the rev limiter? I recently had a conversation with my service advisor on this subject and according to him, you should only be getting range 1 and very few ignitions in range 2 when hitting the limiter.
If you are getting range 4, then the limiter is not doing what it's supposed to do, protect the engine.
If you are getting range 4, then the limiter is not doing what it's supposed to do, protect the engine.
4 ignition cycles is nothing, you are fine.
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FYI, there are 3 ignitions per revolution, and range 4 is 7900-8400 RPM i believe? therefore your engine was at range 4 for less than .03 of a second...youre fine. get out and drive.
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#8
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correct. the rev limiter can only protect from incorrect throttle input (i.e. trying to step on the gas past redline), it cannot protect from an incorrect downshift - or the "money shift", as we like to call it - where a gear ratio combination could potentially push the revolutions far beyond redline.
FYI, there are 3 ignitions per revolution, and range 4 is 7900-8400 RPM i believe? therefore your engine was at range 4 for less than .03 of a second...youre fine. get out and drive.![burnout](https://rennlist.com/forums/graemlins/burnout.gif)
FYI, there are 3 ignitions per revolution, and range 4 is 7900-8400 RPM i believe? therefore your engine was at range 4 for less than .03 of a second...youre fine. get out and drive.
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If this range 4 happened more than a couple miles ago and the car runs fine, I wouldn't give it another thought.
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Yes, you have a problem. Mainly for 2 reasons:
1) Try explaining the over-revs to the next potential, smart, buyer of your car. This will hurt your resale value.
2) Porsche can use the range 4 over-revs to deny a warranty claim. Maybe your warranty is over.
To get the range #3 and range #4 over-revs on your car, you either:
1) Missed a downshift
2) Spun on the track, and spun engine backwards
1) Try explaining the over-revs to the next potential, smart, buyer of your car. This will hurt your resale value.
2) Porsche can use the range 4 over-revs to deny a warranty claim. Maybe your warranty is over.
To get the range #3 and range #4 over-revs on your car, you either:
1) Missed a downshift
2) Spun on the track, and spun engine backwards
#11
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Those numbers are nothing. That car has been driven very conservatively. We have discovered that low numbers (less than 5) in any of the ranges can be suspicious in origin, and often caused by spurious signals, and not by any excessive rpm event.
#12
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I think the Range 3 is definitely result of one mis-shift that I do remember.
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Yes, you have a problem. Mainly for 2 reasons:
1) Try explaining the over-revs to the next potential, smart, buyer of your car. This will hurt your resale value.
2) Porsche can use the range 4 over-revs to deny a warranty claim. Maybe your warranty is over.
To get the range #3 and range #4 over-revs on your car, you either:
1) Missed a downshift
2) Spun on the track, and spun engine backwards
1) Try explaining the over-revs to the next potential, smart, buyer of your car. This will hurt your resale value.
2) Porsche can use the range 4 over-revs to deny a warranty claim. Maybe your warranty is over.
To get the range #3 and range #4 over-revs on your car, you either:
1) Missed a downshift
2) Spun on the track, and spun engine backwards
I do remember one mis-shift that should have caused range 3, but that definitely is not gonna affect warranty. The range 4 *might*, although 4 ignitions in 8000 RPM is like 0.01 of a second most likely a mis-read and I hope it should be fine, at least I have a good argument to make.
Will be careful with shifting from now on!
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#15
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I do remember one mis-shift that should have caused range 3, but that definitely is not gonna affect warranty. The range 4 *might*, although 4 ignitions in 8000 RPM is like 0.01 of a second most likely a mis-read and I hope it should be fine, at least I have a good argument to make.
Will be careful with shifting from now on!![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Will be careful with shifting from now on!
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
A 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