Here's a ghood opportunity to 'test drive" this new 411 section on 6speed and I'm hoping you guys may have some useful info for me.

I have a 2005 997.1 C2S that is fitted with a RUF Kompressor. It currently has 42k miles and the RUF mods were done at 7,000 miles. Last November I finished up a mod where I added active aero to the normally fixed RUF bi-plane rear spoiler and had to go into the coding features using my Durametric Pro cable to re-enable Active Aero functionality. While I was in there I took a look at the DME data and have attached screenshots from when this occurred and another more recent one (March of this year).

As you can see from the older one, it looks like the engine computer is capturing incorrect data. First off, I've never been anywhere near the rev limiter nor missed a shift that would have sent the Tach into the Over-rev ranges shown here, yet there are a number of over-revs logged all the way up through Range 5 and some as recently as within the last 200 hours according to the hour counter vs when they occurred, so I'm pretty sure since I've owned the car since I bought it in March of 2012. Although, if you look at the total hours from the 11-13 reading and the total from the 03-14 reading, they have a difference of 32 hours over 4 months and that's probably pretty average for me, so 8-10 hours / month, which puts the over-rev incidents at maybe right before I bought the car, however, I had an extremely thorough PPI done at the time of purchase and by thorough, I mean 3 days at the dealership with transmission off IMS inspection, compression tests, leakdown tests, full code analysis, etc and the dealer did not mention anything to me about high range overrevs, and said the car was mechanically perfect. The other piece of data that makes me think something is amiss is that you notice there are over-revs logged at the 5621.4 hour mark, yet the total hour counter shows only 5579.7 hours. Unless I've figured out a way to go so fast as to effect the space/time continuum, this seems very unlikely.

I'm concerned that if I ever have an issue with this engine that neither RUF nor Porsche will lend any assistance based on the data that's logged in the DME, or if I were ever to decide to sell the car (extremely unlikely). It just doesn't look like it's capturing accurate information, and I'm not sure why. Have you ever seen this before or do you have any explanation. Is it possible that because of the additional horsepower or the re-tuning that the OEM Porsche gauges are lagging behind the actual RPMs - that seems unlikely since the TT and GT2 cars use the same instrumentation and have even more powerful engines.

Looking at the more recent printout, there aren't any additional over-revs logged, but the total hours is still below when some of the over-revs occurred.

Have you ever come across this before - any idea what might be causing it? If the over-revs happened with the previous owner, and the car received a clean bill of health after the over-revs actually occurred (PPI), any danger of something going wrong now as a result of the over-revs, hundreds of hours later, or should I not concern myself too much?

Thanks.

 

5579 run hours?? that a lot of hours. Like around 180,000 miles worth of hours.

 

See what I mean - really odd behavior considering the car has 42,000 miles.

 

This is an odd one. I’m not really up on the workings of the factory logging ability. However, that does not rule out logic been used here.

Is it possible that some of the over revs recorded could have happened at the time you had the PPI done? If so, that would give cause to why the dealer never mentioned the Over revs. Maybe the test drive was done after the data was looked at?

As for the total hours, that’s something I have no idea about. I cannot see how the ECU is capturing the wrong information, but I can understand it could be possible for your reader to read differently to the Porsche reader. It comes down to what its programmed to read and how.

As for any concerns, did your reader tell the actual upper RPM recorded. If its way up there, then yes you have reason to be concerned, if your reader is actually reading correctly. I’d have the car checked at another dealer or independent shop that has the Porsche reader. Second opinions are good to have. We do this with our own bodies when we get sick, so why not our cars. At least we can talk to the Doctor, our cars cannot. If only they could.

 

That's good advice - thanks. I have not had this looked at outside of my Durametric reader and should take it to a dealer to see if the PIWIS shows the same information. All mine shows is the # of overrevs in the "Ranges" but doesn't actually say what those are - I assumed they were a standard and have seen the actual RPM #s for them defined on this and other forurms. The other thing I will do is hook the Durametric up to my wife's car - also a 2005 997 C2S but without the RUF Modifications and see if her's reads normally or shows the same type of irregular data. At least that will tell me whether it's something related to my Durametric setup, eliminating that variable, which would only leave something specific to my DME or the RUF tuning. I can also do a logging session where I can have the computer capture the RPMs while I'm driving to see if it is consistent with what's being shown by the Tach, eliminating yet another possible issue, where the Tach could be reading low and why I don't think I'm over-revving, but could be. That still doesn't answer the question about why so many hours are being displayed, but at least it's a start. I'll keep you posted on what I find.

 

Good deal. This is a mystery. You state you are a married man.

Remember, "nothing will humble a man more than an engine or an angry wife".

 

That's why you get her one too and paint it pink pearl

 

You are soooo right on the hours - hooked my Durametric up to my wife's 2005 997 C2S this afternoon and captured a screenshot of her info (attached). Hers shows 1,820 hours and her car has 10,000 more miles on it than mine does - definitely something odd going on with mine.

 

You might have a complete copy of the host ecu that was used to develop the tune. Vin number match your car?

 

Thought you might be onto something but yes, the VIN from the DME screen matches the vehicle VIN.

 

Perhaps try again with the latest version of the Durametric software. You are at version 6.3.1.7 from Dec 2012. Version 6.5.0.3 from June 2014 was recently released.

 

Good idea, I'll update it now, but since the readouts from my wife's 997 look normal, I'm doubtful this will change anything.

 

Can't explain the hours but the over revs wouldn't be as much of an issue as the fact that car has an aftermarket supercharger and is nearly 10 years old. Not sure in what circumstances you would expect Porsche to help out but I suspect the SS would negate any engine help regardless of the hours, over revs or age of the engine.

 

I assume the ECU has been re flashed(or re tuned) during the engine mod. If this is the case I d guess that the ECU is not reading as a stock one due to the reflash.

 

I just wanna say that its good post and I really like it so that Thanks so much and wish you all the best.