thanks guys for putting up with me! what do you think about this?

Number of ignitions, range 1 (Type I)
46704 720.8h

Number of ignitions, range 2 (Type II)
1201 720.8h

Operating Hours Counter
724.7

thoughts? thanks and happy holidays.

michael

 

Not sure about the type one as I ussually see redline everytime I drive, but the type two or mechanical overrevs ie money shift if I am not mistaken, and the fact that they only happened four hours ago makes me wonder if they are joy riding the car at the dealership, read beating the crap out of it.

 

yeah...

 

DJM: That's the general feeling I get when I see the Type II over revs close to the time (as represented by the hours) the car is being resold....like the mechanics or the PPI folks OR the Porsche dealership folks take it out and beat the $hit out of it to see what it's got.

 

What dealership is this?

 

excuse my ignorance, but what does the 1st set of #'s signify?

 

I agree with the comments of someone perhaps joy riding or screwing up... the real issue, irrespective of how it was caused, is that any ill effects of the event MIGHT not have played out yet... we certainly have heard of folks with plenty of type IIs, but one gets concerned about over-stressed parts (rods, bearings) with recent 'beatings'.

A few type II over-revs that were many thousands of miles ago are probably not going to suddenly manifest as an issue, if all other tests and inspections are OK.

 

The first set of numbers is the number related to the over-revs....HOWEVER you shouldn't interpret this as meaning that there are 46,704 type I over revs. There have been a number of explanations for this figure, but a logical one is that each revolution involves a set number of ignitions...and you would divide that number into the total to get the actual number of over-revs that occurred....One explanation gave six ignitions per revolution; figuring six cylinders firing..so you divide 46K by 6 and get an actual number over revolutions (revolutions over the limit set by Porsche...which in the TT I believe is set at 6800 rpm). Type I over revs are simply hitting the rev limiter in first...a common occurrence and not much to worry about except that you should probably watch your tach a little closer and shift sooner. Type II's usually occur when you miss a downshift and go from 5th to 2nd and the tach exceeds the 6800 rpms due to the excessive forced revolutions produced by the speed and forward momentum of the car in too low of a gear. The safety mechanism can't shut off the gas to prevent the over rev...and this can damage the engine and/or tranny. A record of Type II over revs does not necessarily mean that the car has been damaged, but is a preliminary indicator of something to look into.

 

what is the dealer??

 

there are actually 3 ignitions per revolution...at 6800 rpm there are 113.33 revs per second or 340 ignitions...46,704 type I's is 137.36 seconds on the rev limiter so the car has been run hard during it's running hours...the type II's represent 3.53 seconds, which is more than enough time to do some damage...it may not have been the dealer..the owner could have missed a shift and decided to sell or trade in the car...I agree with others who say that the fact that the type II's are recent is a problem..if they had happened under 100 hours I wouldn't be as concerned

 

Are you doing compression testing?

 

Is this number accumulated over time? What is reasonable number? Say car is 30Kmiles to 50kmiles. Thanks.

 

GT3: Thanks for the more concise and detailed explanation...and from my comments, it should be obvious that I've heard a number of expanations for how many ignitions occur in a cycle. For curiosity sake, could you explain how you get the three ignitions per rev? Is it related to the igniton and exhaust strokes? For my own edification,..I'd truly like a better understanding of this process.

 

I agree with the consensus of it being bothersome that the over-revs are recent. I'd be comfortable if they were more than 10k miles or ~100-150 hours ago...

 

When I was purchasing my car, the service manager ran the report for me and showed 258 type 2's. He wasn't too concern about it and I questioned him about it. He explained that the type 2's could be caused by hitting the rev-limiter and possibly bouncing off of it. Type 2's are counted once the RPM's exceed a certain number (I forgot what it is now).