Looking for a 997, which year to avoid ?
07-28-2010, 02:38 AM
#46
Rennlist Member
A 997.1 DME records the number of ignitions which occur above 7200 RPS (red line) in 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
At 7200 RPM you have 120 revs per second X 3 ignitions per revolution or 360 ignitions per second.
Here is an example of a DME readout. The car spent the following time in each rev range, assuming the midpoint of each range as the actual RPM.
Range 1 - 3,603 ignitions / 370 per second = 9.74 seconds
Range 2 - 407 ignitions / 380 per second = 1.07 seconds
Range 3 - 36 ignitions / 390 per second = 0.09 seconds
Range 4 - 0
Range 5 - 0
Range 6 - 0
Ignitions in Ranges 1 - 3 should not cause you any problems with engine damage or with the warranty. Range 4 gets into the gray area, but revs in Ranges 5 and 6 are red flags for the potential to have warranty voided by Porsche. That is why you want to get a print out of the number of revs in each range.
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
At 7200 RPM you have 120 revs per second X 3 ignitions per revolution or 360 ignitions per second.
Here is an example of a DME readout. The car spent the following time in each rev range, assuming the midpoint of each range as the actual RPM.
Range 1 - 3,603 ignitions / 370 per second = 9.74 seconds
Range 2 - 407 ignitions / 380 per second = 1.07 seconds
Range 3 - 36 ignitions / 390 per second = 0.09 seconds
Range 4 - 0
Range 5 - 0
Range 6 - 0
Ignitions in Ranges 1 - 3 should not cause you any problems with engine damage or with the warranty. Range 4 gets into the gray area, but revs in Ranges 5 and 6 are red flags for the potential to have warranty voided by Porsche. That is why you want to get a print out of the number of revs in each range.
When I was looking to buy my 996 GT3 back in 2006, I purchased a Durametric reader ($150) and software which plugs into the DME at one end and has a USB connection at the other. When a GT3 made my short list, I'd bring the reader and my laptop, sit in the driver's seat and download the DME data. I found several cars with over-rev ranges that I was not comfortable with as Porsche would most certainly void the warranty if issues arose...
I know these actions may appear extreme, but I really did not want to pay $100+ for multiple PPIs to get access to the DME data... Unfortunately, most dealers were not making this data readily available. Hopefully times have changed...
-B
07-28-2010, 08:47 AM
#47
Burning Brakes
Yeah that makes sense. I think I will continue my search for a nice C2S. This is a wonderful forum two which I am very new.. I just sold my 964 to a guy who is turning into a Rothman Rally car. He flew in to my local airport bought the car then drove away in it for his 1000mile journey home. I had to call for a ride. So I am in the market for a P'car.
Thanks
Thanks
07-28-2010, 12:57 PM
#48
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At the time I bought my '05 (winter '09) it was $10K less than an '06 at the same dealer, which had more miles on it, less options, and not as nice a color combo. I got the car with CPO, and when it expires I'm getting a bumper-to-bumper extended warranty for 6 more years, which I would've done with the '06 as well (only ten "minor" repairs of $300 will pay for the cost of the warranty...I've already got my money back on the extended warranty for my '03 E-Class and it has 2 more years to go). I doubt I'll keep the car beyond another 7 years, but if I do, the $10K I saved initially will pay a good part of a new engine should the IMS go boom. And since an '05 can be retrofitted, I have the option of having the LN IMS bearing installed whenever I need a clutch job. So avoiding an '05 is not exactly the no-brainer some seem to make it out as.
