stop light switch open
immobilizer active
a/c request active
cruise control readiness on
clutch switch not actuated
cruise control-store accell not actuated
cruise control decel/resume not actuated
Operating hrs counter 2053.4000 h
Recall campaigns 3 0x00 00 00 00 00 00 00
recall campaigns 4 0x00 00 00 00 00 00 00
throttle angle, nominal value 0

number of ignitions at speed> maximum speed,
range 1 2218
range2 1319
range3 889
range4 615
range5 24
range6 0

operating hours counter reading at overspeed
range1 2050.500 h
range2 2023.400 h
range3 1540.900 h
range4 1340.900 h
range5 1540.900 h
range6 0.000 h

 

Range 4 and 5 overrevs would definately walk me away from that car...I ve posted a table somewhere indicating rpm for range 5...I am sure you wont like the numbers you will see...

 

I would pass as well

Edwin

 

number of ignitions at speed> maximum speed,
range 1 2218
range2 1319
range3 889
range4 615
range5 24
range6 0

operating hours counter reading at overspeed
range1 2050.500 h
range2 2023.400 h
range3 1540.900 h
range4 1340.900 h
range5 1540.900 h
range6 0.000 h

I'm assuming you want a thorough description, so forgive me if I tell you something you already know.

The top set of numbers tells you the number of ignitions at each rpm range indicated in the picture below. These are all above redline, obviously, and considered subsequently more serious--in terms of the risk of damage to the engine--as you move from range 1 to range 6.

The bottom set of numbers tells you when the last ignitions in each range occurred.

Of your report, I would point out a few things:

1) You have 2,053.4 hours on your engine, and the last range 5 overrev occurred at 1,540.9 hours, giving you 512.5 hours since the range 5 overrevs. The longer the car goes after the overrev without any engine issues, the more confident one can be that no damage occurred. 500 hours is a pretty long time for the engine to go without showing signs of damage, if there was some. Not impossible, but you get the idea.

2) There are 3 ignitions per revolution in these boxer engines. At range 5 you are at approximately 8,000 revolutions per minute. This means 133.33 revolutions per second. Therefore, 24 ignitions equals (24/133.33) 0.18 seconds, or less than two tenths of a second above 7,900 rpm. You can do the math to figure out how long the engine has spent in the other ranges.

3) Ranges 1 and 2 are possible without an errant downshift. That is, you can (and will if you drive in a spirited manner) cause range 1 and 2 overrevs simply by shifting at the redline and allowing the engine's inertia to overrev itself. The limiter is at about 7,300 rpms, IIRC, which is in range 3. (Someone correct me on this if needed.)

4) Therefore, a monkey shift is needed to cause range 4 and above overrevs--possibly even range 3, depending on whether I have that limiter rpm correct.

Now, MHO:
If this is the car you want, and it checks out otherwise--PPI, service records, etc.--then don't let the DME steer you away by itself. Just let the tech doing the PPI know about the DME, and ask about possible tests to target engine areas that might have been affected by the high overrevs--maybe a compression test, for example.

These engines have been built to nearly 1,300 HP. 750 HP on stock internals is fairly common among enthusiasts. The GT1 has proven to be a remarkably robust engine over many years. My take on the DME is it was designed to allow Porsche to deny warranty claims. My two cents.

Good Luck,
LP

 

Excellent and a sensible ^ post.

I would say if the car checks out fine then go for it. The chances of any engine damage showing up 500 hours later is almost negligible.

Keep us posted.

 

To the OP, I just went through this process recently and did a lot of due diligence including educating myself on the DME read out. L Perm has given you an excellent break down on your DME and you should consider his thoughtful feedback when debating your decision

In addition to what's been said I would add that based on your DME the car you are considering has been driven hard with multiple shifts at redline, several encounters with the rev limiter and at least one mis-shift over 7900 (this is my interpretation of what I see in the DME). Now for me the range 1-3 are acceptable because if you drive this car as intended this is what the DME should look like in this range. The range 4s show several run ins with the rev limiter and possibly a mis-shift in there, not the end of the world but something to consider. IMO the range 5 indicates a definite mis-shift and possible engine damage, but as stated earlier the car has over 500 hours of trouble free (yes?) operation since then

So long story short, if all else checks out during your PPI and this car is optioned as you absolutely love then I would go for it but ONLY with a full 3 year extended warranty. Or at a minimum a 2 year CPO warranty

Good luck
Art

 

If you talk to the tuners, they will tell you this engine can run all day safely in the high 7k rpm range. No worries if the PPI checks out.

 

Just shifting to redline will register range 1s and 2s. Honestly it looks like this car really wasn't driven that hard. With over 500 hours since the Range 5, I think it is going to be OK.

There are other things to worry about, like possibly getting the turbos re-lubed (I had to have mine done again, yes the original recall was performed) and deciding what you'll do about an aftermarket warranty - I got the dreaded P00021 recently which is a $6000-$9000 fix (e.g. PCNA has their dealers replace cams and sensors for this now). Seems like something a little too common on the 997TT to ignore. Fortunatley it was covered under warranty... if not...

 

 

Well...range 5 occurs from 7900 to 9000rpm...so we really DONT know whether that engine revved up to 8000rpm or close to 9000rpm...lets say 8800rpm...Please dont forget variocamplus...It is not designed to rev over 7300-7500rpm...each and every engine that is tuned to rev higher than 7500rpm should have plus feature disengaged or replace heads with GT3 parts...Stock rev limit is only at 6750rpm...from there to over 8000rpm is a risk...

 

Do you mean redline? Perhaps you're using redline and rev limit synonymously. I have seen the redline quoted as 6,780 RPM a number of times, but I've also read more than once that the rev limiter--the fuel shutoff--is 500 RPM above redline, which would put it at 7,280 RPM. I've never hit the rev limiter, so I don't know for sure. Can anyone clear this up?

Thanks,
LP

 

In spirited driving, it seems like hitting the rev limiter can occur. I was under the impression that the rev limiter was there to protect the engine from damage? If so, would hitting the rev limiter really be an issue? My tech yells me that the Metzger engine can safely be taken to 7,000 rpm, if that is true, I would think that range 1 or 2 over-revs would be a non issue.

 

Stock rev limit at 996/997,1 turbo engines is set at 6750rpm...If you look at the tables of overrev ranges,they always start with range 1 overrevs which is always 50rpm higher than stock rev limit...So at turbo range 1 starts at 6800rpm...

 

both mass air flow sensors were found faulty and replaced a couple weeks ago.

 

@ chris, this is a gt silver turbo, not the black one you received info on.