997 DME diagnostic ranges
06-04-2007, 06:03 PM
#19
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Originally Posted by jase997
You don't have a bigger version of the letter do you mate?
the 6 ranges are broken down as follows:
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
To my knoweldge range 1 & 2 overrevs are not a big deal, but 3 and
especially 4 are the points when engine damage occur (i.e. upto 8400
rpm for range 4, or more than 1000 rpm above redline).
If I remeber correctly you said your range 3 was 50 which is really not much. As was said above these are not events but ignition sparks in those rev ranges. I think 50 would acct for probably just one range 3 event. Probably not much to worry about.
The results from my 05 C2S I made them take back were:
range 1 - 4695
range 2 - 1364
range 3 - 669
range 4 - 453
0's in ranges 5&6
I agree with Edgy though that Porsche would not hesitate to use the DME to deny coverage.
06-04-2007, 06:10 PM
#20
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Thanks for that. I hate finding these things out, being an engineer I look into things too deeply and should probably just get out there and enjoy her!
Although, I do feel like going for a brand new Boxster S and running her in myself and taking good care of her. But owning a 911 has been my dream, just a pity I couldn't afford a new one!
Although, I do feel like going for a brand new Boxster S and running her in myself and taking good care of her. But owning a 911 has been my dream, just a pity I couldn't afford a new one!
06-04-2007, 06:32 PM
#21
Originally Posted by dstrimbu
I don't think that the event counter is in milliseconds.
I think that they are ignition events. So 22,000 in Range 1 would mean that spark plugs fired 22,000 times in that RPM band.
Hawk is correct, of course - you can't hurt the engine by hitting the rev limiter. You can destroy it by hitting second gear (instead of fourth) when shifting out of third at redline. That's a mechanical over-rev... valves hitting pistons, et al...
Relax.
I think that they are ignition events. So 22,000 in Range 1 would mean that spark plugs fired 22,000 times in that RPM band.
Hawk is correct, of course - you can't hurt the engine by hitting the rev limiter. You can destroy it by hitting second gear (instead of fourth) when shifting out of third at redline. That's a mechanical over-rev... valves hitting pistons, et al...
Relax.
That's what it was, I know it wasn't how many incidents it took place. Either way he has nothing to worry about.
Dave
06-04-2007, 08:00 PM
#22
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Originally Posted by jase997
Thanks for that. I hate finding these things out, being an engineer I look into things too deeply and should probably just get out there and enjoy her!
Although, I do feel like going for a brand new Boxster S and running her in myself and taking good care of her. But owning a 911 has been my dream, just a pity I couldn't afford a new one!
Although, I do feel like going for a brand new Boxster S and running her in myself and taking good care of her. But owning a 911 has been my dream, just a pity I couldn't afford a new one!
I promise, you'll have a lot more fun. Avoid mechanical overrevs, and you'll be golden.
Best way to avoid a mech overrev is to shift smoothly and deliberately. I read Ross Bentley's "Speed Secrets" and realized that my seating position was all wrong. I was too far back in the seat, and didn't have a solid leverage position to work the wheel.
Also, when you're too far back, you can lock your knees on a brake or clutch pedal depress. This is not good. Finally, sitting forward helps position you over the shifter which really makes it easy to determine the next gear you're selecting. If you're too far back, you'll have a tendancy to pull the shifter toward you when upshifting 3-4, and you'll catch second, again. Ask me how I know...
I did not let the clutch out on that shift. Good thing! :-)
-don
I have a lot to learn about this car, but I do know one thing - if you're smooth and deliberate, you won't hurt it.
06-05-2007, 05:54 PM
#23
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I think I need to just get out and enjoy this awesome machine I've wanted for many years and if something happens in the future, I'll deal with it then! I had a bad salesman and that's what started by distrust ever since but I have a full years Porsche warranty to back me up. Thanks for all your helpfull comments guys.
My dealer has sent a query to Germany RE: rough idle. He said they may recommend a remap of the ECU.
My dealer has sent a query to Germany RE: rough idle. He said they may recommend a remap of the ECU.
06-05-2007, 06:04 PM
#24
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When my car threw a CEL last summer, the first suspect was bad gas. My dealer dumped my ECU and emailed the dump parameters to the factory.
The next morning, the factory recommended an ECU reflash with a later dot version of the code. Since then, zero issues. The idle is stable and smooth as glass.
By all means, enjoy that car. You have in your hands a vehicle that most of the population can't imagine driving, let alone owning. It's so much fun - don't worry, be happy!
-don
The next morning, the factory recommended an ECU reflash with a later dot version of the code. Since then, zero issues. The idle is stable and smooth as glass.
By all means, enjoy that car. You have in your hands a vehicle that most of the population can't imagine driving, let alone owning. It's so much fun - don't worry, be happy!
-don
06-06-2007, 12:34 AM
#26
Your car is fine. You are fine. Congratulations on your choice of vehicles and on your purchase. As to the minor "overrevs" that is why there is a rev limiter. Enjoy things Don. Life is...well, you know 
06-06-2007, 12:44 AM
#27
Here's a thought: 7200 rpm = about 120 revs/sec. Given 6 ignitions/rev that gives a count of 720 if car hits limiter for 1 sec. Maybe a little over enthusiastic but not abusive I'd say
06-06-2007, 01:28 AM
#28
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Originally Posted by gpjli2
Here's a thought: 7200 rpm = about 120 revs/sec. Given 6 ignitions/rev that gives a count of 720 if car hits limiter for 1 sec. Maybe a little over enthusiastic but not abusive I'd say
