Warranty and Rev Range
- Thread starter RICH.P
- Start date
Clive,
Not sure whether we are disagreeing, it may be that Porsche disregard (i.e. can't overrev?) but the ECU does record overrevs and I have the reports inc one from our favourite service department that evidence this; my PDK GTS' ECU recorded overrevs in Ranges 1, 2 and 3.
Not sure whether we are disagreeing, it may be that Porsche disregard (i.e. can't overrev?) but the ECU does record overrevs and I have the reports inc one from our favourite service department that evidence this; my PDK GTS' ECU recorded overrevs in Ranges 1, 2 and 3.
And what are the total hours run?
Also, is the 819 hours less 779 hours the 40 hours you referred to?
Also, is the 819 hours less 779 hours the 40 hours you referred to?
My understanding is that those numbers are ignitions (sparks). Quick bit of maths. Take a gentle 6000rpm - that's 100 revs/sec. Each plug will fire every second revolution, therefore each plug fires 50 times per second. 6 plugs so that's 300 sparks per second (amazing really) So even the range 1 over revs are a little more than one second and at the higher ranges millisecs - so, even if they are correct, I doubt you would notice! I don't know if the 11 at range 3 would be the same 11 as range 4? Given the number of sparks per second at range 5 rpms ( >7900rpm) I doubt it is possible to only record 3!! I work that out to be 0.007 secs in that range.
Chris_in_the_UK
New member
The issue of overrun needs to be considered when discussing PDK - whilst it might not allow a down shift in manual mode, if one has enough momentum and are on the limiter going downhill then it will go beyond the software.
Alan,
I am sure you are correct. The 3, 4 and 5 are such small event counts all with the same last event hours that it does look very odd and worth going back to see whether they really do require all the extra tests before issuing a warranty.
I am sure you are correct. The 3, 4 and 5 are such small event counts all with the same last event hours that it does look very odd and worth going back to see whether they really do require all the extra tests before issuing a warranty.
It shows the last run time hours that an event in each range occurred.
All of the events are fairly recent (834h at test and 819h/779h) so is the car new to you otherwise has there been some spirited driving recently unlike previous travels.
I think 3 R5 is nonsense and I would get rather stroppy
All of the events are fairly recent (834h at test and 819h/779h) so is the car new to you otherwise has there been some spirited driving recently unlike previous travels.
I think 3 R5 is nonsense and I would get rather stroppy
Magic919
New member
Ranges 3 and 4 became a problem a while ago and I can't see Porsche shifting on this. Even if the OPC yielded, a warranty claim could still prove problematic. They'll argue the engine got buzzed and it can be enough to cause a failure. Most sensible buyers would probably relax after a clear 100 hours without problems.
Does anyone know if one spark in Range 5 also counts as one spark in ranges 1,2,3 and 4 too? From the hours it appears to one (possible) event. To trigger R5 the revs would have to be at least 7900. To drop below R3 they would have to be less than 7200. Even if they are added up separately it is total of 25 sparks in R3 or higher. That means the revs would have to decay from 7900 to 7200 in 0.07 secs, or thereabouts. And I doubt that is possible even if the engine seized! Thus I would throw a lot of doubt on the validity of those read outs. Anyone better at maths than me to disprove? I would certainly challenge how such numbers are possible.
I don't KNOW but all reports I have seen the count gets lower for each higher rev range
Chris_in_the_UK
New member
Interesting debate but it seems that OPC hold all the cards currently?
Ralph,
Skuserob asked a question about possibly over-revving the engine by downshifting - and you can't. [
]
Neither can I conjure up a scenario with the engine revving its socks off on the limiter on a downhill section and exceeding its rev limit.
RICH.P has a manual and that's a different story. []
Regards,
Clive.
Skuserob asked a question about possibly over-revving the engine by downshifting - and you can't. [
] Neither can I conjure up a scenario with the engine revving its socks off on the limiter on a downhill section and exceeding its rev limit.
RICH.P has a manual and that's a different story. [
]Regards,
Clive.
I have some new info which, although doesn't help Rich a lot, does clarify what the numbers mean. R4, in this case can be ignored and the relevant numbers are the R3 and R5 values. The "11" and the "3" refer to the number of occasions the rev limit has been exceeded and not, as I erroneously thought, the number of ignitions. Personally, as these all happened around the same time, I still find it difficult to find a scenario where the revs dropped below and then back up above the R3 limit 11 times and the R5 3 times. Even selecting 2nd gear from 5th when going downhill it would require some serious mishandling, I would have thought? The key factor in determining whether these are likely to be accurate, as Ralph has indicated, is that the numbers decrease as the range gets higher (which is why R4 in this event can be ignored). This is because one R5 exceedance also counts as one R3 and one R4.
In order to get an extended warranty the car has to run 200 hours past the event time, i.e in this case another 160 hours, have a compression check, oil filter off to be examined for debris and a road test to check for any smoke from the exhaust.
Out of interest R1 just records the rev limit being reached and R2 records it being held on the rev limiter - which is why R1 and R2 are ignored on PDK/Tip cars.
In order to get an extended warranty the car has to run 200 hours past the event time, i.e in this case another 160 hours, have a compression check, oil filter off to be examined for debris and a road test to check for any smoke from the exhaust.
Out of interest R1 just records the rev limit being reached and R2 records it being held on the rev limiter - which is why R1 and R2 are ignored on PDK/Tip cars.
Alan,
See this piece re overrevs
http://www.911virgin.com/porsche/rev-range-information/
See this piece re overrevs
http://www.911virgin.com/porsche/rev-range-information/
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