PDK over rev?

[hixster]

So, having now owned my 981S for a few weeks, I'm beginning to get comfortable with the limits of the car.
I haven't been pushing it too hard.

I hit about 7200 Revs today (god it sounds good!) - but have not wanted to go any further.
I had the car go through the 111 check prior to purchasing and it showed no over revs.

So my question is, is it possible to over rev the PDK box?

Edited by hixster on Monday 21st November 09:45

[Magic919]

You'll generally only see range 1 & 2, so don't worry.

[Porsche911R]

Magic919 said:

You'll generally only see range 1 & 2, so don't worry.

I doubt you will see any in any Rev range.

[bcr5784]

hixster said:

So my question is, is it possible to over rev the PDK box?

I don't think it is - I can't think how you might do it unless the software is faulty.

[DJMC]

bcr5784 said:

I don't think it is - I can't think how you might do it unless the software is faulty.

What would happen it you put your foot to the floor in Neutral?
Would the revs be halted by a rev limiter?

[bcr5784]

DJMC said:

What would happen it you put your foot to the floor in Neutral?
Would the revs be halted by a rev limiter?

Yes.

[993AL]

I chopped my 991 GT3 in to a non Porsche dealer recently, they said that they would need a print out for evidence of over revs. I called the OPC who advised that they don't check for over revs on any PDK car as it is impossible for the car to be over rev'd.

[DJMC]

993AL said:

I chopped my 991 GT3 in to a non Porsche dealer recently, they said that they would need a print out for evidence of over revs. I called the OPC who advised that they don't check for over revs on any PDK car as it is impossible for the car to be over rev'd.

To the OP - it can be quite alarming thinking it's going to rev forever but the answers above explain it's safe to keep your foot down and it'll change up... eventually. I took mine on a half day "warm up" at the PEC and glimpsed the needle heading to 8,000 a few times.

What IS the rev limit on the 981 2.7 anyone?

[b2tus]

I have a couple of times pressed the PDK downshift button instead of the upshift!!! Hell of a bounce on the revs but seems there have been no ill effects so guess the rev limiter did its work.

Must admit to not liking the stupid buttons on the multi function steering wheel and am starting to think about the other option wheel with "proper" paddles. Must look at the costs and how many functions I would lose.

Has anyone on here had the steering wheel change? If so, how much was it and do you miss the loss of certain functions?

[DJMC]

Sheffield quoted me £1500 all in last October for MFSW to Sport Design when I found a possible car with MFSW.

I wonder if the GT wheel from the 718 is retrofittable?

[Rockster]

hixster said:

So, having now owned my 981 for a few weeks, I'm beginning to get comfortable with the limits of the car.
I haven't been pushing it too hard.

I hit about 7200 Revs today (god it sounds good!) - but have not wanted to go any further.
I had the car go through the 111 check prior to purchasing and it showed no over revs.

So my question is, is it possible to over rev the PDK box?

I've been told it is possible. One scenario that was described to me has the PDK in manual shift mode and the driver driving the car down a mountain grade close to or at red line. Even if the driver lifted off the gas pedal gravity could cause the vehicle to go faster and the engine RPMs could exceed the red line threshold.

While possible I think it unlilkely. But even so were I buying a PDK equipped used Porsche I'd want to see the DME over rev counter read out with a current engine run time time stamp. One can take the engine run time and divide that into the odometer reading and get the average speed of the vehicle. Knowing this can help one get a better picture of how the car was used.

[Gorsh]

Rockster said:

I've been told it is possible. One scenario that was described to me has the PDK in manual shift mode and the driver driving the car down a mountain grade close to or at red line. Even if the driver lifted off the gas pedal gravity could cause the vehicle to go faster and the engine RPMs could exceed the red line threshold.

While possible I think it unlilkely. But even so were I buying a PDK equipped used Porsche I'd want to see the DME over rev counter read out with a current engine run time time stamp. One can take the engine run time and divide that into the odometer reading and get the average speed of the vehicle. Knowing this can help one get a better picture of how the car was used.

This scenario is how a manual would get over revved, so I would imagine your source was thinking manual. I'm pretty sure PDK would change up at the red line even on overrun, manual mode means nothing as it gets overridden at max revs.
I can fully understand checking for over rev history on a manual, but I fail to see how average speed is any use as even a car regularly driven hard is going to spend considerable time at low speeds so the average is pretty meaningless - now if you could see the number of times max revs was reached it would mean something, but I don't know if that's possible. Even then a lot is unknown, for instance was it revved hard when cold? So it's almost impossible to get a complete picture of a cars history.
These engines are built for high performance and the sound at high revs is part of the driving pleasure, so most owners will rev them.

[dreamcar]

b2tus said:

I have a couple of times pressed the PDK downshift button instead of the upshift!!! Hell of a bounce on the revs but seems there have been no ill effects so guess the rev limiter did its work.

Must admit to not liking the stupid buttons on the multi function steering wheel and am starting to think about the other option wheel with "proper" paddles. Must look at the costs and how many functions I would lose.

Has anyone on here had the steering wheel change? If so, how much was it and do you miss the loss of certain functions?

My previous Porsche was a pre owned 997/2 Carrera S PDK and that came with the ghastly multi function wheel. I couldn't get rid of it quick enough! Looks horrible, like something out of a truck and those terrible push / pull sliding things. Retrofitted the sport design wheel and transformed the feel of the car. It's not cheap though, around £900, but worth every cent. Don't miss the multifunction facilities one bit as I prefer an uncluttered wheel.

[Magic919]

Here's some data from a PDK car I scanned.

Over-revs Range 1
18123 / 328.78h
Over-revs Range 2
31 / 278.22h
Over-revs Range 3
0 / 0.00h
Over-revs Range 4
0 / 0.00h
Over-revs Range 5
0 / 0.00h
Over-revs Range 6
0 / 0.00h

I think these are most likely to occur in the sport modes.

[bcr5784]

Magic919 said:

Here's some data from a PDK car I scanned.

Over-revs Range 1
18123 / 328.78h
Over-revs Range 2
31 / 278.22h
Over-revs Range 3
0 / 0.00h
Over-revs Range 4
0 / 0.00h
Over-revs Range 5
0 / 0.00h
Over-revs Range 6
0 / 0.00h

I think these are most likely to occur in the sport modes.

What is the definition of over-revs then? Given that there seems a general consensus that it is not possible to exceed the rev limiter limit (soft in normal, hard in Sport I think) does this mean that the car has spent 600 hours bouncing off the limiter? Seems a bit implausible, the driver would have to be a complete moron.

[dreamcar]

DJMC said:

Sheffield quoted me £1500 all in last October for MFSW to Sport Design when I found a possible car with MFSW.

I wonder if the GT wheel from the 718 is retrofittable?

Sheffield must have seen you coming mate! I'm at work currently so can't check the invoice but I am certain Porsche Centre Swindon charged me £900 or thereabouts to supply and fit - I'm certain it wasn't more than that.

No reason why the superb GT wheel wouldn't fit, as apart from the engine 718 is only a facelift I'm sure it would (ithe non MF was standard on 981 Spyder and GT4) but you'd lose the Sport / Sport Plus / Launch Control indication on the wheel. In the case of the MF GT wheel you'd need to check with Porsche that the multi function controls would work but logic says there is no reason why they shouldn't if the pick up points for the electronics are th same.

[Porsche911R]

bcr5784 said:

What is the definition of over-revs then? Given that there seems a general consensus that it is not possible to exceed the rev limiter limit (soft in normal, hard in Sport I think) does this mean that the car has spent 600 hours bouncing off the limiter? Seems a bit implausible, the driver would have to be a complete moron.

It's not over reved but has spent about 48 seconds on the limiter. if the limiter was 7500 rpm.

[bcr5784]

Porsche911R said:

It's not over reved but has spent about 48 seconds on the limiter. if the limiter was 7500 rpm.

Sounds much more plausible - but where does the 48 seconds come from? Are you saying that the over-rev refers to the soft limit (7500rpm) rather than the hard one at 7800?

[Porsche911R]

bcr5784 said:

Sounds much more plausible - but where does the 48 seconds come from? Are you saying that the over-rev refers to the soft limit (7500rpm) rather than the hard one at 7800?

I am saying the computer logs revs, we don't know the car but range 1 and 2 are not over revs, just the soft limiter I took to be 7500rpm. Porsche change the range 1 limit log depending on the car.

3 upwards is a real over rev, and Porsche were ok with range 3 up untill about 2 years a go, now they hate range 3, but that's a tough one as OPC sold 1000's of car with rev range 3 hits when they allowed it, so goodness knows how those people get on with their dealers, as 3rd party dealers have no clue and OPC's know very little and every one panics !

to work it out you have to find the rev limit of that car, then work out the engine revolutions, than take that figure and work out how many seconds the engine spent at that limit.

[DJMC]

Gorsh said:

This scenario is how a manual would get over revved, so I would imagine your source was thinking manual. I'm pretty sure PDK would change up at the red line even on overrun, manual mode means nothing as it gets overridden at max revs.
I can fully understand checking for over rev history on a manual, but I fail to see how average speed is any use as even a car regularly driven hard is going to spend considerable time at low speeds so the average is pretty meaningless - now if you could see the number of times max revs was reached it would mean something, but I don't know if that's possible. Even then a lot is unknown, for instance was it revved hard when cold? So it's almost impossible to get a complete picture of a cars history.
These engines are built for high performance and the sound at high revs is part of the driving pleasure, so most owners will rev them.

What it the PDK is already in 7th gear, going 170+mph down the mountain? It would have to over rev then, yes?