GT3 transmission failures
06-07-2005, 01:08 PM
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GT3 transmission failures
Does anyone have any information on this statement by Joel Reiser PCA?
"I have been hearing of some GT2 and GT3 transmission failures first from Spencer ***, and then from Brian Copans. The main problem is that third gear is too thin radially in its design now between the outer teeth and the bearing race. They break if the driver is not very clean with all shifts. Even then there is concern that they still break just because there is not enough steel where its needed.
I do not have any data t o suggest that changing the gear oil more often could actually avoid the problem, but my best guess would be "no". I would save the coins for the possibility of a rebuild just in case."
"I have been hearing of some GT2 and GT3 transmission failures first from Spencer ***, and then from Brian Copans. The main problem is that third gear is too thin radially in its design now between the outer teeth and the bearing race. They break if the driver is not very clean with all shifts. Even then there is concern that they still break just because there is not enough steel where its needed.
I do not have any data t o suggest that changing the gear oil more often could actually avoid the problem, but my best guess would be "no". I would save the coins for the possibility of a rebuild just in case."
06-07-2005, 07:44 PM
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Well, I am the one who asked the question of Joel. I had one of the fellows at Devek warning me to change the transmission fluid soon and often because of failures they have seen. Joel's answer obviously indicated it is a design problem that we may have to deal with. 
Jim
Jim
06-08-2005, 12:49 PM
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And how often do you have to change transmission fluid? What are symptoms-no 3rd gear? What kind of sloppy shifting is considered sloppy like money shift kinda thing? Regards. Mike
06-08-2005, 02:55 PM
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I don't believe this until I hear from the race teams that race GT3 Cups.
There isn't a large enough sample size of GT3s or GT2s to make a statistically conclusive announcement about GT3 transmissions being weak.
I don't doubt Joel's experience at all, but there is a lot of GT3 Cup cars out there.
There isn't a large enough sample size of GT3s or GT2s to make a statistically conclusive announcement about GT3 transmissions being weak.
I don't doubt Joel's experience at all, but there is a lot of GT3 Cup cars out there.
06-08-2005, 03:06 PM
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Three Wheelin'
Changing the oil will not work.....the lower the ratios the thiner the gears.....the cup cars use a lower R&P 4.00 this way they can use a higher ratio gear(thicker).........the R&P itself with the lower ratio (4.00) will still need to be changed over time......that's life with the Porsche Trannys.
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06-08-2005, 03:07 PM
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Originally Posted by bora
I don't believe this until I hear from the race teams that race GT3 Cups.
There isn't a large enough sample size of GT3s or GT2s to make a statistically conclusive announcement about GT3 transmissions being weak.
I don't doubt Joel's experience at all, but there is a lot of GT3 Cup cars out there.
There isn't a large enough sample size of GT3s or GT2s to make a statistically conclusive announcement about GT3 transmissions being weak.
I don't doubt Joel's experience at all, but there is a lot of GT3 Cup cars out there.
Jim
06-08-2005, 03:32 PM
#9
Three Wheelin'
Most race teams are proactive...they check there transmissions after every race....I got my info from BMC&G, Brian Copans who makes a living doing Porsche race trannies.
06-08-2005, 03:56 PM
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Originally Posted by bora
I don't believe this until I hear from the race teams that race GT3 Cups.
"I have been hearing of some GT2 and GT3 transmission failures first from Spencer ***, and then from Brian Copans"
Doesn't Brian Copan's rebuild transmissions for a huge percentage (80-90%) of the GT3 based pro race teams in the USA?
06-08-2005, 04:01 PM
#11
Three Wheelin'
Yes Brian Copans does do most of the trannies for the Porsche race teams...he travels to all the ALMS races and he also does some Grand Am and Speed World cup cars....he only does club stuff on the side provided he has time....His main thing is race cars....this guy knows his stuff.
