A One Off? 991 GT3RS fire!
Discussion
NIgt3 said:
Mezger not retired yet, Porsche still see fit to race it in their motorsport cars.
True... But thats motorsport and its not really competitive there any longer either. GT3/RS always been a fast'ish road cars you can fiddle round a track for fun, but its by no means a race car. Though aero on 991RS is getting closer to race car experience for there braver. Mermaid said:
Boxsters don't catch fire, Caymans don't, Cayennes, Panameras, non GT3 911's don't. So what is the vulnerable point?
High revs?
I doubt its as simple as revs. The non RS was the con rod bolts if we are happy to believe Porsche. We will never know.High revs?
What has caused the RS fires? We will probably never know for sure either.
Here's the german thread on pff.de with some additonal info.
http://www.pff.de/porsche/board104-porsche-modelle...
Posters who were there said the first engine lunched itself on the way home from factory collection (posting #2317) and he was still running in the second one when it blew up (posting #2311).
I think that's about as much info as we will get.
Now why he would run in an engine on a racetrack...
My personal opinion is that Porsche was a bit too optimistic with the redline in the 991 GT3 and the aggressive shifting strategy of the PDK-S exacerbates this issue because it really does keep the revs up there when you pin it, arguably more so than a manual would. They backed down on the redline a bit with the RS but apparently not enough.
I recall watching a video with Walter Röhrl in the 991 GT3 and he commented that he always pulls the paddle at 7500 rpm because he has mechanical sympathy for the car. I thought that was strange but now I wonder if he knew something back then that we didn't.
http://www.pff.de/porsche/board104-porsche-modelle...
Posters who were there said the first engine lunched itself on the way home from factory collection (posting #2317) and he was still running in the second one when it blew up (posting #2311).
I think that's about as much info as we will get.
Now why he would run in an engine on a racetrack...
My personal opinion is that Porsche was a bit too optimistic with the redline in the 991 GT3 and the aggressive shifting strategy of the PDK-S exacerbates this issue because it really does keep the revs up there when you pin it, arguably more so than a manual would. They backed down on the redline a bit with the RS but apparently not enough.
I recall watching a video with Walter Röhrl in the 991 GT3 and he commented that he always pulls the paddle at 7500 rpm because he has mechanical sympathy for the car. I thought that was strange but now I wonder if he knew something back then that we didn't.
Edited by EricE on Thursday 27th August 06:49
hunter 66 said:
And we have had a blow up ..... so what part of life ....... when racing a rebuild of an RSR engine every 50 hours is part of reducing this issue..
Mate porsche never used to do this on so called flagship model road cars,the last1000 rpm will always be expensive one way or another.A good place for a fine steak chef to strutt his stuff,what better than a porsche designed bbqPdk in full dull sport mode is brutal on the top revs,as is a sequential.I remember my trip out in the old silver beast after it had gone from manuel to a holinger,i thought F poor engine!,
I ran my last new toy in on a race track,probaly no better place!
I would really like to see a privateer team enter a 991 GT3 RS for the 24 hours of Le Mans just to see what happens.
Back in the 70s people ran very lightly modified 911S with stock 2.0S/2.2S engines at Le Mans and had very few problems. That's 24 hours, full throttle and over 85% of max RPM most of the time at an average speed fairly close to the top speed of the car. Based on the recent reports I am not too convinced many 991 GT3/GT3 RS would survive that.
Back in the 70s people ran very lightly modified 911S with stock 2.0S/2.2S engines at Le Mans and had very few problems. That's 24 hours, full throttle and over 85% of max RPM most of the time at an average speed fairly close to the top speed of the car. Based on the recent reports I am not too convinced many 991 GT3/GT3 RS would survive that.
swimd said:
I would really like to see a privateer team enter a 991 GT3 RS for the 24 hours of Le Mans just to see what happens.
Back in the 70s people ran very lightly modified 911S with stock 2.0S/2.2S engines at Le Mans and had very few problems. That's 24 hours, full throttle and over 85% of max RPM most of the time at an average speed fairly close to the top speed of the car. Based on the recent reports I am not too convinced many 991 GT3/GT3 RS would survive that.
Chris Harris did the Ring 24 in a stock 997 GT3 RS didn't he? It went to the end with no problems. Back in the 70s people ran very lightly modified 911S with stock 2.0S/2.2S engines at Le Mans and had very few problems. That's 24 hours, full throttle and over 85% of max RPM most of the time at an average speed fairly close to the top speed of the car. Based on the recent reports I am not too convinced many 991 GT3/GT3 RS would survive that.
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