Another warranty issue that is no clear cut
- Thread starter marlin
- Start date
berty987
New member
I dont beleive all over revs are a result of downshifts , if you are accelerating hard and miss a gear change (particularly in sport mode) I could easilly beleive the inertia in the engine could carry the revs well over the standard rev limiter , after all , the rev cut out only cuts the fuel it doesn't apply a brake to the engine.
ORIGINAL: garyw
Ye,s but as ever it doesn't stop an over rev from an 'excited' downshift []
I've never heard of them requesting this information before and quite alarmed that they should now be!!
garyw
Tiptronic wins again!! Pressing the button evokes no response if the engine parameters would be exceeded on a downchange. Also if you forget to change up it does it for you!
Maybe not in the spirit of great motoring enthusiasts but I just love it.
I assume that the Gen 2 Doppel thing does the same?
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Nasty!!
I had an MG Midget many years ago which I managed to over rev in 2nd (going downhill) and blew a core plug out. That killed the sparks as the water flooded everything, my first experience of a rev limiter!
Fortunately after I hammered a new plug in it ran like clockwork but I found that Ihad a very light righr foot after that.
With modern Porsche engines so willing to rev I am not surprised that over reving is becoming an issue. I cannot decide whether these tell tale electronic "minders" are a good thing for the owner / potential owner or not. They certainly seem to be capable of being used against you in a warranty claim. I suppose only an OPC workshop has the kit needed to tap these statistics.
My 997 T4S Tip had over revs recorded , I had a print out when I purchased the car from an OPC, if I rember there were 49 in zone 1 and 5 in 2, which after a lot of searching by trawling through various forums etc were found to be nothing to worry about.
As I understand but not certain
Zone 1 and 2 not bad
Zones 3 and 4 concern over heavy use but acceptable to some ( if you know about it ) ???
Zones 5 and 6 very high over revs 2000 rpm plus
I wouldn't knowingly purchase a car with any over revs over zone 2.
The over revs are also recorded by time of some sort.
As I understand but not certain
Zone 1 and 2 not bad
Zones 3 and 4 concern over heavy use but acceptable to some ( if you know about it ) ???
Zones 5 and 6 very high over revs 2000 rpm plus
I wouldn't knowingly purchase a car with any over revs over zone 2.
The over revs are also recorded by time of some sort.
It would be interesting to get more details on these incidents as I find it hard to understand how over revving can happen on a Tip under driving conditions although I am sure someone will explain to me.
Possibilites revving up the engine in neutral (by garage mechanic checking something? ) or revving it up at traffic lights also in neutral.
These no load situations would certainly worry me more.
I have heard that Tip incorporates an elementary "launch control" which I believe consists of holding the car on the brakes, revving up to whatever then releasing the brakes. Sounds horrendous. I have never and will never try it! (on my car anyway!)
Possibilites revving up the engine in neutral (by garage mechanic checking something? ) or revving it up at traffic lights also in neutral.
These no load situations would certainly worry me more.
I have heard that Tip incorporates an elementary "launch control" which I believe consists of holding the car on the brakes, revving up to whatever then releasing the brakes. Sounds horrendous. I have never and will never try it! (on my car anyway!)
You can't overrev a tip in neutral, it has a limiter around 4,200 revs.
Pleased to hear it, but not physically! With no load the engine acceleration must be fantastic so I am sure the rpm will carry on increasing after the limiter cuts in.
I used to have a Turbo RX7 that did just that under load wheras the Tip will just change up.
Are there any other suggestions as to how a Tip can record over revving? !
What's the rev limit on a 997TT?
I ask because range 1 is I think below/at the limiter, (so entirely possible with a tip). Getting a handful of rev range 2s (ie hundredths of a second) could just be a delay in the limiters software.
Thanks!
So as I thought, Rev range 1 is entirely possible with a Tip because it's at the rev limit, and rev range 2 is only 200 revs away. Probably easiest done with WOT in 1st, the revs rushing too quickly to the limiter for the electronics to be able to kick in quickly enough to stop it hitting 7000 revs for a couple of firings.
I see what you mean.
If I want to confirmnthe TT box is entrely idiot proof, we do need to find out the parameters that are set into the computer for upward changes too. I would expect them to be well below red lines speeds partiucularly ist at WOT with sports chrono turbo boost operating as the revs just runaway then.
I would be quite disappoiunted to find that WOT in 1st allows over revving even though this is not a practise I endulge in. The car starts in 2nd from stationary unless 1st is selected although a great bootful might start it in 1st. I will have to try this somewhere safe as although I track my car we have rolling starts up to the fairly slow pit lane limit. .
Perhaps I have been relying on the technology too much but although my style of driving probably doesn't approach these parameters I have always drawn comfort from the fact that I couldn't break this one!!
If I want to confirmnthe TT box is entrely idiot proof, we do need to find out the parameters that are set into the computer for upward changes too. I would expect them to be well below red lines speeds partiucularly ist at WOT with sports chrono turbo boost operating as the revs just runaway then.
I would be quite disappoiunted to find that WOT in 1st allows over revving even though this is not a practise I endulge in. The car starts in 2nd from stationary unless 1st is selected although a great bootful might start it in 1st. I will have to try this somewhere safe as although I track my car we have rolling starts up to the fairly slow pit lane limit. .
Perhaps I have been relying on the technology too much but although my style of driving probably doesn't approach these parameters I have always drawn comfort from the fact that I couldn't break this one!!
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