Alan C.

I forgot I had the car in manual and selected sport. When the engine hit 9000 it fell flat. I took it out of manual and all was well. I had the DME read and it showed 66 counts in range 1. That works out to about 0.15 seconds at 9000 rpm.

Edit: Check the link below for information on the rev ranges for the 991 GT3 engine and a bit further down the 997 Mezger GT3 Engine. Much tighter ranges on this engine.

https://rennlist.com/forums/991-gt3/...ed-events.html

MileHigh911

Nothing wrong with that Alan. Can't hurt the engine with hitting the rev limiter. Maybe hitting it coming down a mountain pass could cause a true over rev.

Alan C.

True, I was just sharing that it is possible with the above combination.

kosmo

Wouldnt the ecu prevent that?

MileHigh911

ECU would prevent over rev from throttle. But it is the momentum over revs that it can not. Never heard of an issue with PDK

Alan C.

Mine was an unusual case which most people would not encounter. The ECU does do an outstanding job of protecting the engine. 0.15 sec is pretty amazing to me.

bronson7

Curious to know how much time (secs) over the 9000 rpm would it start to cause concern and how soon over rev does the ecu kick in? Obviously very quickly.

911dev

With the 997 1 and 2 range over revs were meaningless. I expect the same with the 991, 9A1 engine. We all know range 1s are nothing to worry about as it's just bouncing off the limiter as it should; 2s should be the same.

PDK-S will not allow money shifts.

That said, there are perfectly sound Mezgers out there with a lot of range 3 and 4 over revs; not that I personally would buy one, but sound engines nonetheless.

Todd B

for level 1 and 2 over revs no harm, it's the higher levels that are bad and cause damage.

911dev

Technically, no PDK will not prevent an over rev from throttle. It will prevent the aforementioned momentum aka money shift; i.e. from 5th to 2nd with too much speed. However, PDK does allow the engine to spin into the red; range 1 and 2. These ranges are not an issue, but are over revs nonetheless.

bronson7

This may sound like a dumb question but I'II ask anyways. Can you define what the levels 1, 2, 3, etc are and mean? Thank you in advance.

ElectricChair

I have seen PDK cars with over 20,000 on range 1.

Don't worry, 66 is nothing.

911dev

Ranges are determined by the numeric value the engine speed attained.

The value (66 above) is the revolutions the engine was in the red. As he stated above that works out to about .15 of a second.

I do not have the rev range chart for the 991 GT3, but an example may be 9000-9200 is Range 1, 9201 - 93xx is Range 2, etc... These are nothing to worry about.

Porsche defines over revs by range number, time spent in the respective range and hours of operation (used to be 50) since the over rev (range 3 and beyond in example) to determine if there was any damage.

Ranges 5 and 6 in regards to the 997 were defined by Porsche as damage has occurred, whether you think so or not. These are the dreaded money shifts.

kosmo

what does this mean? The PDK downshifted when you pushed the SPORT button even though you were in manual?
tks

NateOZ

I assume it was more likely the throttle mapping change from selecting sport without lifting?