Are Diffs vaguely the same across most vehicles?
Discussion
Maybe very vague this but my tip Porsche has an issue with the diff. It's a rare tiptronic that no one ever sees and has experience of. I have found what the issue is but I can fix it as I am no good.
The issue is it knocks when going on and off throttle. A chap in the USA has had the same issue as me and has sorted it and said this which makes little to no sense to me:
Well after a bit of effort I have hopefully solved the differential problem I was having. Just to recap, my diff was making a progressively louder clacking noise when accelerating or decelerating. After checking for loose trans/engine mounts and other suspension parts I finally narrowed it down to the differential.
At this point decided to readjust the shims beneath the cups. The procedure I used was similar to that described for the GT2 (couldn't find any info for the 996tt tip). The first step was to determine the total width of S1 + S2. To do this I added 1mm to both and measured the remaining play to be 0.5mm. To this I added 0.35mm preload for a S1+S2 total of 2mm +0.5mm +0.4mm. In the end the optimal backlash was found by using a 1mm stack height for S1 and 1.85mm for S2 (as close as I could get to 1.9mm using the shims on hand).
Would someone who sees diffs day in day out be able to sort this out? From what I undertstand it appears to just need some sort of shim backlash fix type job?
The issue is it knocks when going on and off throttle. A chap in the USA has had the same issue as me and has sorted it and said this which makes little to no sense to me:
Well after a bit of effort I have hopefully solved the differential problem I was having. Just to recap, my diff was making a progressively louder clacking noise when accelerating or decelerating. After checking for loose trans/engine mounts and other suspension parts I finally narrowed it down to the differential.
At this point decided to readjust the shims beneath the cups. The procedure I used was similar to that described for the GT2 (couldn't find any info for the 996tt tip). The first step was to determine the total width of S1 + S2. To do this I added 1mm to both and measured the remaining play to be 0.5mm. To this I added 0.35mm preload for a S1+S2 total of 2mm +0.5mm +0.4mm. In the end the optimal backlash was found by using a 1mm stack height for S1 and 1.85mm for S2 (as close as I could get to 1.9mm using the shims on hand).
Would someone who sees diffs day in day out be able to sort this out? From what I undertstand it appears to just need some sort of shim backlash fix type job?
I may be wrong, but I think all GT2 996 Porsches are manual and have a plate type LSD. I also understand that porsche did not fit a LSD type differential to any tiptronic 996.
I am not sure why your car is so rare, the tiptronic boxes in 996s are very common, the later boxes are the same basic unit as used by Mercedes.
I am not sure why your car is so rare, the tiptronic boxes in 996s are very common, the later boxes are the same basic unit as used by Mercedes.
_gez_ said:
You should speak to Ken at Nine Exellence. He has plenty of experience with the tip gearboxes.
Excellent , this person will definitely be able to sort my issue out . That's my very tranny!http://www.nineexcellence.com/performance/transmis...
Sump said:
Maybe very vague this but my tip Porsche has an issue with the diff. It's a rare tiptronic that no one ever sees and has experience of. I have found what the issue is but I can fix it as I am no good.
The issue is it knocks when going on and off throttle. A chap in the USA has had the same issue as me and has sorted it and said this which makes little to no sense to me:
Well after a bit of effort I have hopefully solved the differential problem I was having. Just to recap, my diff was making a progressively louder clacking noise when accelerating or decelerating. After checking for loose trans/engine mounts and other suspension parts I finally narrowed it down to the differential.
At this point decided to readjust the shims beneath the cups. The procedure I used was similar to that described for the GT2 (couldn't find any info for the 996tt tip). The first step was to determine the total width of S1 + S2. To do this I added 1mm to both and measured the remaining play to be 0.5mm. To this I added 0.35mm preload for a S1+S2 total of 2mm +0.5mm +0.4mm. In the end the optimal backlash was found by using a 1mm stack height for S1 and 1.85mm for S2 (as close as I could get to 1.9mm using the shims on hand).
Would someone who sees diffs day in day out be able to sort this out? From what I undertstand it appears to just need some sort of shim backlash fix type job?
Other than he's explained it rather poorly and his maths is slightly to cock it makes perfect sense to me. He determined that the no-load clearance in the unit with no shims at all was 2.50mm. He did this by adding a total of 2mm of shims to start with (1mm to each side) and then measured that there was a further 0.50mm clearance with feeler gauges. Any starting point that gave a bit of easily measurable clearance would have sufficed. He just chose to start at 2.0mm.The issue is it knocks when going on and off throttle. A chap in the USA has had the same issue as me and has sorted it and said this which makes little to no sense to me:
Well after a bit of effort I have hopefully solved the differential problem I was having. Just to recap, my diff was making a progressively louder clacking noise when accelerating or decelerating. After checking for loose trans/engine mounts and other suspension parts I finally narrowed it down to the differential.
At this point decided to readjust the shims beneath the cups. The procedure I used was similar to that described for the GT2 (couldn't find any info for the 996tt tip). The first step was to determine the total width of S1 + S2. To do this I added 1mm to both and measured the remaining play to be 0.5mm. To this I added 0.35mm preload for a S1+S2 total of 2mm +0.5mm +0.4mm. In the end the optimal backlash was found by using a 1mm stack height for S1 and 1.85mm for S2 (as close as I could get to 1.9mm using the shims on hand).
Would someone who sees diffs day in day out be able to sort this out? From what I undertstand it appears to just need some sort of shim backlash fix type job?
He wanted the preload to be 0.35mm hence a requirement for a total of 2.85mm of shims (2.50 + 0.35). He achieved this by fitting a 1mm shim to one side and a 1.85mm shim to the other. Simples.
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