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Original RPM "cut-off" (limit) for a 91 3.6 M5 Original RPM "cut-off" (limit) for a 91 3.6 M5
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Old 18th June 2004, 15:20   #1
Nuno Miguel
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Original RPM "cut-off" (limit) for a 91 3.6 M5
What is the original RPM "cut-off" (limit) for a 91 3.6 M5 USA version.




I think my car is chiped...
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Old 18th June 2004, 18:32   #2
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
Any one?
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Old 18th June 2004, 18:44   #3
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
7200 rpm

many aftermarket chips have moved the limiter up to 7500-7600 rom.

some of them will sell a the chip, reprogrammed back to original rpm redline, if you request.
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Old 18th June 2004, 23:46   #4
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
7250 RPM I think...
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Old 20th June 2004, 17:15   #5
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5


Mine does a least 7600/7700rpm!!! (it reachs almost the 7900mark)

So... it is chiped for shure, right?
I tought i was stock...
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Old 20th June 2004, 17:29   #6
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
Quote:
Originally Posted by Nuno Miguel


Mine does a least 7600/7700rpm!!! (it reachs almost the 7900mark)

So... it is chiped for shure, right?
I tought i was stock...
Try to keep her safely below 7300 rpm (it's better for the motor)
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Old 21st June 2004, 16:05   #7
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
How can i be shure if it is chiped, and what version does it have?
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Old 21st June 2004, 17:04   #8
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
Quote:
Originally Posted by Nuno Miguel
How can i be shure if it is chiped, and what version does it have?
Open the DME and locate the chip, and there should be a label on it identifying who made it. If you don't have a stock rev. limit, I suggest you get a chip with one or your angine life will be greatly shortened if you rev. it over 7250 often. Your engine may experience crank failure once in the 7500 rpm range if it has all stock parts due to torsional vibration of the crank.

Mark
Last edited by MarkD; 21st June 2004 at 17:06.
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Old 21st June 2004, 17:15   #9
Nuno Miguel
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
Quote:
Originally Posted by MarkD
engine may experience crank failure once in the 7500 rpm range if it has all stock parts due to torsional vibration of the crank.

Mark
Can you explain this beter? whats crank failure?


And if i have some care and never pass the 7000rpm, is it safe?
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Old 21st June 2004, 17:44   #10
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Re: Original RPM "cut-off" (limit) for a 91 3.6 M5
Quote:
Originally Posted by Nuno Miguel
Can you explain this beter? whats crank failure?


And if i have some care and never pass the 7000rpm, is it safe?

Here are some articles on torsional vibration. Basically, it causes crankshaft failure. And yes if you take care not to rev over 7200 you should be OK. (or get one of my chips)

http://www.indiacar.com/index2.asp?p..._vibration.htm

http://www.tpub.com/content/construc...s/14264_85.htm

MarkD
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