How many 15-16 gt3's have engine replaced?
#2056
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Rich, need to get the autopsy results.
Does anyone know if most of these failures were on cars with over the equivalent of 50+ track hours? And what were their post mortum results?
It could be that Porsche under estimated the amount of track use these cars would get since they are not dedicated track cars and failed the provide appropriate recommendations for rebuild times based on use.
No engine can run forever on the track without track maintenance.
#2057
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The new Cup has recommended rebuild intervals of 100hrs and supposedly uses the same basic engine architecture as 991 GT3/RS, although we really won't know true overlap until we can compare parts. For reference, the prior Mezger-based Cups had 50hr recommended rebuilds.
Porsche clearly has a lot of faith in the new motor. I just hope it's fully debugged for Gen II cars (and the Cup).
Porsche clearly has a lot of faith in the new motor. I just hope it's fully debugged for Gen II cars (and the Cup).
250 track hours seems like an awful lot - much higher than I've seen cited when I was researching Cup cars. I realize it's not an apples to apples comparison since previous Cup cars had the Metzgers, but if anything, the comparison should favor the Metzger. Still seems high. Lots of members have had Cup cars - would be interested in their thoughts.
Recommended rebuild intervals may be based on maintaining performance, rather than preventing engine failure, and I would expect the former to require shorter rebuild intervals.
If we assume a typical DE day is 2 track hours, we can ask how many DE days the engine should be able to go until a rebuild. Even if you assume only 25 days a year, which doesn't seem high, then you have 100 days and 200 hours in four years, whereas we're seeing engine failures with only a fraction of that. I've seen other street Porsche's go more than 100 track days without an engine rebuild (eg, our Cayman R).
Maybe the 9K rev limit is too ambitious and part of the problem, but I doubt Porsche is going to admit that by doing a recall which backs the rev limit down to say 8.7K (though I personally wouldn't have an issue with that).
Addendum 1: Neither the 6K nor 12K track maintenance includes anything related to potential engine rebuild, and 12K track miles is roughly 80 track days and 160 track hours, so the engine is presumably supposed to be good for at least that much without rebuild.
Addendum 2: Rebuilding the engine during the warranty period could be viewed as voiding the warranty for the engine, so not only should we not be expected to rebuild the engine during the warranty period, but arguably we're not even allowed to do so without risking the warranty. Ergo, assuming we do necessary fluid changes, spark plug changes, etc., the engine is necessarily on Porsche's watch during the warranty period.
Last edited by Manifold; 11-22-2016 at 10:41 AM.
#2058
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Addendum 1: Neither the 6K nor 12K track maintenance includes anything related to potential engine rebuild, and 12K track miles is roughly 80 track days and 160 track hours, so the engine is presumably supposed to be good for at least that much without rebuild.
Addendum 2: Rebuilding the engine during the warranty period could be viewed as voiding the warranty for the engine, so not only should we not be expected to rebuild the engine during the warranty period, but arguably we're not even allowed to do so without risking the warranty. Ergo, assuming we do necessary fluid changes, spark plug changes, etc., the engine is necessarily on Porsche's watch during the warranty period.[/QUOTE]
Thats a great point, preventive maintenance actually voiding the warranty.
Addendum 2: Rebuilding the engine during the warranty period could be viewed as voiding the warranty for the engine, so not only should we not be expected to rebuild the engine during the warranty period, but arguably we're not even allowed to do so without risking the warranty. Ergo, assuming we do necessary fluid changes, spark plug changes, etc., the engine is necessarily on Porsche's watch during the warranty period.[/QUOTE]
Thats a great point, preventive maintenance actually voiding the warranty.
#2059
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Early in the release of the 991.1 GT3 I remember reading a comment by AP that one of the goals was making this engine last 100,000 miles. He didn't say track miles but some percentage of track miles had to be factored into the total.
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#2061
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My understanding is that Cups and other race cars after a certain amount hours rebuilds are highly recommended.
The GT3 is not a race car. It's a street track car that I am sure will require a rebuild after a certain amount of track hours. Its a machine that is subject to wear especially from high stress and heat wear and at a certain point I would think a top end refresh is a good idea.
One thing I have noticed is that GT3 routinely predominate as repeat flyers at track days over other high performance exotics. You may see a Lambo, Mac, Ferraris show up for a track day and not come back. Porsches tend to come back again and again.
I am beginning to think Porsche underestimated the number of hours these cars would actually see on the track.
The GT3 is not a race car. It's a street track car that I am sure will require a rebuild after a certain amount of track hours. Its a machine that is subject to wear especially from high stress and heat wear and at a certain point I would think a top end refresh is a good idea.
One thing I have noticed is that GT3 routinely predominate as repeat flyers at track days over other high performance exotics. You may see a Lambo, Mac, Ferraris show up for a track day and not come back. Porsches tend to come back again and again.
I am beginning to think Porsche underestimated the number of hours these cars would actually see on the track.
#2063
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I don't think so. AP specifically said : " 80% of our customers take their GT car on a track. " That's a very specific number. He might know something.
On top of it,this is the first GT3 that specifies " warranty for track use " as long as regular track maintenance is performed. That track maintenance speaks of CLs,brakes etc...definitely not of top end rebuilds! Overly confident Germans? Perhaps...
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#2064
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i wonder if Porsche will alter their track warranties after this GT3 991.1 situation. Considering the vast amount of money spent, will they pull back, or feel compelled to keep standards with other brands which are now offering track-usable warranties (ford/chevy/dodge/mclaren just to name a few top of mind)
#2065
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i wonder if Porsche will alter their track warranties after this GT3 991.1 situation. Considering the vast amount of money spent, will they pull back, or feel compelled to keep standards with other brands which are now offering track-usable warranties (ford/chevy/dodge/mclaren just to name a few top of mind)
#2066
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i wonder if Porsche will alter their track warranties after this GT3 991.1 situation. Considering the vast amount of money spent, will they pull back, or feel compelled to keep standards with other brands which are now offering track-usable warranties (ford/chevy/dodge/mclaren just to name a few top of mind)
Is it not just the first year built GT3's that's got track warranty?
"As of now, we can only confirm that the 2014 models had the note regarding track warranty. The note apparently was removed from the 2015/16 race circuit addendum. Very interesting especially since those 2014 warranties were also extended to 100K."
https://rennlist.com/forums/991-gt3-...arranty-2.html
#2067
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Originally Posted by Kobalt
Is it not just the first year built GT3's that's got track warranty?
"As of now, we can only confirm that the 2014 models had the note regarding track warranty. The note apparently was removed from the 2015/16 race circuit addendum. Very interesting especially since those 2014 warranties were also extended to 100K."
https://rennlist.com/forums/991-gt3-...arranty-2.html
"As of now, we can only confirm that the 2014 models had the note regarding track warranty. The note apparently was removed from the 2015/16 race circuit addendum. Very interesting especially since those 2014 warranties were also extended to 100K."
https://rennlist.com/forums/991-gt3-...arranty-2.html
#2068
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I think there is a difference between contractually covered by warranty and covered under goodwill by Porsche's discretion. So far they've been very good about warranty coverage with track use, but that could end at some point if it's not explicitly covered like in 2014...
#2069
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i wonder if Porsche will alter their track warranties after this GT3 991.1 situation. Considering the vast amount of money spent, will they pull back, or feel compelled to keep standards with other brands which are now offering track-usable warranties (ford/chevy/dodge/mclaren just to name a few top of mind)
Is it not just the first year built GT3's that's got track warranty?
"As of now, we can only confirm that the 2014 models had the note regarding track warranty. The note apparently was removed from the 2015/16 race circuit addendum. Very interesting especially since those 2014 warranties were also extended to 100K."
https://rennlist.com/forums/991-gt3-...arranty-2.html
"As of now, we can only confirm that the 2014 models had the note regarding track warranty. The note apparently was removed from the 2015/16 race circuit addendum. Very interesting especially since those 2014 warranties were also extended to 100K."
https://rennlist.com/forums/991-gt3-...arranty-2.html
#2070
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Originally Posted by GrantG
I think there is a difference between contractually covered by warranty and covered under goodwill by Porsche's discretion. So far they've been very good about warranty coverage with track use, but that could end at some point if it's not explicitly covered like in 2014...