PDK Over-Revs

[mambodoc]

Still tryin to figure out the PDK, but now the Cabulator is crystal clear!

[mdrums]

Either pdk or 6speed will not over rev by simply pressing
the accellerator pedal and rev it up to redline. The rev limit will cut
fuel and save you. The way you over rev a car is by downshifting
to a lower gear and mechanically cause the engine to turn past redline.
Pdk will not allow this to happen.

[cello]

Originally Posted by larrytrk

I believe my lunar waneshaft is out of phase!!

You must be "side fumbling" then.

Man, that is classic. Pretty dense fog there

[Edgy01]

Originally Posted by mdrums

Either pdk or 6speed will not over rev by simply pressing
the accellerator pedal and rev it up to redline. The rev limit will cut
fuel and save you. The way you over rev a car is by downshifting
to a lower gear and mechanically cause the engine to turn past redline.
Pdk will not allow this to happen.

This is really not true. There is so much momentum established with running up to redline in first gear, for example, that you will exceed the rev limiter's cut out and mechanically you will exceed 7300 RPM, the designated redline of the 997 engine. This is another method of exceeding redline other than the usually suspect "money shift" when selecting an inappropriate gear below your current choice.

Driver's should not believe for a moment that the rev limiter will keep you entirely out of trouble with upshifts. The Sports Chronometer option also somewhat exacerbates this, with it's much more aggressive rev cutout.

[mdrums]

Edgy, from my experiance with a Tip and PDK the fuel is cut at redline and the engine will not over rev. I instruct for DE's and students always forget to shift and redline the car and the 6 speeds I've been in do the same. With a manual you can over rev with the "money shift" and danage the engine. There are different over rev's counted in the ECU some maybe the mildest over rev is when you hit redline and fuel is cut?

[No HTwo O]

Originally Posted by mdrums

Either pdk or 6speed will not over rev by simply pressing
the accellerator pedal and rev it up to redline. The rev limit will cut
fuel and save you. The way you over rev a car is by downshifting
to a lower gear and mechanically cause the engine to turn past redline.
Pdk will not allow this to happen.

Mike, here are the 6 over rev ranges for a 997.1 (6 speed):

A 997-1 DME records the following rev ranges:
Range 1: 7300-7500 RPM
Range 2: 7500-7700 RPM
Range 3: 7700-7900 RPM
Range 4: 7900-8400 RPM
Range 5: 8400-9500 RPM
Range 6: 9500-11000 RPM

You can exceed the rev-limiter by at lest the 3 different ways:

1) Hitting the rev-limiter, and not shifting soon enough (usually range 1 or 2)
2) Missed down shift (no protection from the rev-limiter downshifting)
3) Spinning the car, and not getting the clutch in fast enough (engine gets spun backwards)

[mdrums]

No HTwo O, thanks for the info...so Porsche says hitting the rev limitier is an over rev. I understood your 1) but now I understand Porsche says that is an over Rev. I understood your 2) and 3).
THANKS!

[Edgy01]

Just remember that these high reving engines can well exceed the 7300 rpm redline simply on engine inertia. Fuel cutoff at 7300 isn't sufficient to spare you from that. I have many "over revs" from my aggressive driving and have never made a "money shift." It's just the momentum of all that mass.