5 speed or 6 speed?
11-14-2006, 08:47 AM
#61
Rennlist Member
944Racing also built a SSK for our cars but that was a few yrs back. They are no longer in business. That was made using a different angle at the shift linkage on the transaxle. I have a brand new spare if someone wants to look at it.
Wes, let me know if I can help.
Raj
Wes, let me know if I can help.
Raj
11-14-2006, 12:56 PM
#62
Burning Brakes
Raj I was looking for some pictures of the ssk from 944 racing but one of the guys who promised me them from 968uk let me down, if you could mail me some pics that would be great as we are remaking one for my car as we speak.
11-14-2006, 03:54 PM
#64
Originally Posted by 968TurboS
944Racing also built a SSK for our cars but that was a few yrs back. They are no longer in business. That was made using a different angle at the shift linkage on the transaxle. I have a brand new spare if someone wants to look at it.
I have a SSK in my 951 that was previously in a 968 but have no idea who the maker is/was.
11-14-2006, 07:44 PM
#66
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There is a lot of bad information in this thread.
The 951 and 968 transmission have no parts in common and there is no way you could use a 951 R&P in a 968 trans. The diff cannot be interchanged either.
The 968 trans is far stronger than a 951 trans. A 951 trans is pretty strong (especially the S version), so the 968 is all but bulletproof, as far as power handling goes. There is no need to 'harden' the gears.
The 968 trans shares no parts with late model 911's, with the exception of the differential and differential bearings. This is good, because you therefore have a huge selection of diffs to choose from. Guard diffs are great, most Porsche Motorsport diffs are great, and most Porsche street diffs are crap. I would be afraid to run an open diff with big power. It will break.
Torsen diffs are not usable in cars with 500 ft/lbs of torque. Forget that. Almost all the 968 torsens I have seen have been ruined by track use.
968 TRS axles may still be available from Porsche. These are nice and get rid of the pathetic 951 axles.
I think the 968 will be pretty short in a 500hp street car. It will be exciting to drive though.
John, sloppy shifting? I thought the 968 shifted much better than the 951. You must use the 968 shift lever and shift rod to get it right. Of course the parts can't be worn out (ie used) or they will be sloppy.
Chris Cervelli
Premier Motorsports
The 951 and 968 transmission have no parts in common and there is no way you could use a 951 R&P in a 968 trans. The diff cannot be interchanged either.
The 968 trans is far stronger than a 951 trans. A 951 trans is pretty strong (especially the S version), so the 968 is all but bulletproof, as far as power handling goes. There is no need to 'harden' the gears.
The 968 trans shares no parts with late model 911's, with the exception of the differential and differential bearings. This is good, because you therefore have a huge selection of diffs to choose from. Guard diffs are great, most Porsche Motorsport diffs are great, and most Porsche street diffs are crap. I would be afraid to run an open diff with big power. It will break.
Torsen diffs are not usable in cars with 500 ft/lbs of torque. Forget that. Almost all the 968 torsens I have seen have been ruined by track use.
968 TRS axles may still be available from Porsche. These are nice and get rid of the pathetic 951 axles.
I think the 968 will be pretty short in a 500hp street car. It will be exciting to drive though.
John, sloppy shifting? I thought the 968 shifted much better than the 951. You must use the 968 shift lever and shift rod to get it right. Of course the parts can't be worn out (ie used) or they will be sloppy.
Chris Cervelli
Premier Motorsports
11-15-2006, 10:20 AM
#68
Rennlist Member
Originally Posted by Premier Motorsp
There is a lot of bad information in this thread.
The 951 and 968 transmission have no parts in common and there is no way you could use a 951 R&P in a 968 trans. The diff cannot be interchanged either.
The 968 trans is far stronger than a 951 trans. A 951 trans is pretty strong (especially the S version), so the 968 is all but bulletproof, as far as power handling goes. There is no need to 'harden' the gears.
The 968 trans shares no parts with late model 911's, with the exception of the differential and differential bearings. This is good, because you therefore have a huge selection of diffs to choose from. Guard diffs are great, most Porsche Motorsport diffs are great, and most Porsche street diffs are crap. I would be afraid to run an open diff with big power. It will break.
Torsen diffs are not usable in cars with 500 ft/lbs of torque. Forget that. Almost all the 968 torsens I have seen have been ruined by track use.
968 TRS axles may still be available from Porsche. These are nice and get rid of the pathetic 951 axles.
I think the 968 will be pretty short in a 500hp street car. It will be exciting to drive though.
John, sloppy shifting? I thought the 968 shifted much better than the 951. You must use the 968 shift lever and shift rod to get it right. Of course the parts can't be worn out (ie used) or they will be sloppy.
Chris Cervelli
Premier Motorsports
The 951 and 968 transmission have no parts in common and there is no way you could use a 951 R&P in a 968 trans. The diff cannot be interchanged either.
The 968 trans is far stronger than a 951 trans. A 951 trans is pretty strong (especially the S version), so the 968 is all but bulletproof, as far as power handling goes. There is no need to 'harden' the gears.
The 968 trans shares no parts with late model 911's, with the exception of the differential and differential bearings. This is good, because you therefore have a huge selection of diffs to choose from. Guard diffs are great, most Porsche Motorsport diffs are great, and most Porsche street diffs are crap. I would be afraid to run an open diff with big power. It will break.
Torsen diffs are not usable in cars with 500 ft/lbs of torque. Forget that. Almost all the 968 torsens I have seen have been ruined by track use.
968 TRS axles may still be available from Porsche. These are nice and get rid of the pathetic 951 axles.
I think the 968 will be pretty short in a 500hp street car. It will be exciting to drive though.
John, sloppy shifting? I thought the 968 shifted much better than the 951. You must use the 968 shift lever and shift rod to get it right. Of course the parts can't be worn out (ie used) or they will be sloppy.
Chris Cervelli
Premier Motorsports
Thanks Chris.
Raj
11-19-2006, 09:35 PM
#71
Rennlist Member
Originally Posted by nick_968
Raj I was looking for some pictures of the ssk from 944 racing but one of the guys who promised me them from 968uk let me down, if you could mail me some pics that would be great as we are remaking one for my car as we speak.
As for doing an install, check with JET951. He has just done one for Thingo in his '89 951 and it works really well apparently.
Do the 968 axles fit the 951?
11-19-2006, 10:25 PM
#72
Rennlist Member
Thread Starter
Hey Bob, I did call David at Powerhaus. I'm for sure I need a rebuild.
He also has a line on ssk's for his 968 projects and will be calling me back with the info. I'll pass it on when he does.
Let's talk diffs. I spoke with Chris Cervelli. He recommended a 40/40 diff for the street. An 80 percent lockup for race cars. I drive pretty hard and would like the best of both worlds. What do you think. With a 40/40, how long would it take to lock up and why would I want to wait at all for it to lockup? Finally, I have an 89 Turbo S now. What percent lockup is it so I can compare? Thanks.
He also has a line on ssk's for his 968 projects and will be calling me back with the info. I'll pass it on when he does.
Let's talk diffs. I spoke with Chris Cervelli. He recommended a 40/40 diff for the street. An 80 percent lockup for race cars. I drive pretty hard and would like the best of both worlds. What do you think. With a 40/40, how long would it take to lock up and why would I want to wait at all for it to lockup? Finally, I have an 89 Turbo S now. What percent lockup is it so I can compare? Thanks.
11-19-2006, 11:06 PM
#73
Rennlist Member
I've pondered this 'how much lock' a lot, I have 'shimmed' diff in my 968 gbx, it is known as an '80%', though it is probably less.I had a fresh '89 lsd before this, the shimmed diff locks a lot more, ie better than the 951.The car tends to shoot forward more under throttle, it is a little disconcerting at first, but feels fine, car is more stable decelerating as well.
Everyone seems to say don't go above 40% for the street, but I don't find it a problem, and it feels way better on the track.ymmv
Everyone seems to say don't go above 40% for the street, but I don't find it a problem, and it feels way better on the track.ymmv
11-19-2006, 11:48 PM
#74
Rennlist Member
Originally Posted by DFASTEST951
I spoke with Chris Cervelli. He recommended a 40/40 diff for the street. An 80 percent lockup for race cars. I drive pretty hard and would like the best of both worlds. What do you think. With a 40/40, how long would it take to lock up and why would I want to wait at all for it to lockup? Finally, I have an 89 Turbo S now. What percent lockup is it so I can compare? Thanks.
11-20-2006, 12:23 AM
#75
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Originally Posted by Oddjob
Stock factory 944 series LSDs are all 40/40. So that would be staying with what you already have/had.
Also, several have suggested calling Powerhaus- I thought they were referring to Powerhaus II, not Powerhaus, although I'm sure they know a little about it, but Powerhaus II is the gear place.
Also, for comparison, when new, Bimmers from the 80's & 90's had 20%. Our cars had 40%, the 968 Turbo's had 60%... I had always planned on a Torsen, but now want to do a bit more research- had never heard that they couldn't handle power until Chris mentioned it- of course, I don't have the power you do Joe. Anyway, for a ZF rebuild,. I'd always planned on 60%, since the 968 Turbo had it, but several have advised me not to go over 40-50. I think I'd shoot for 50%, but then, I'm like that- I always want a little more than factory. Also, assuming the factory does lose some lock right off the bat, then I'd rather start a bit higher than stock. It all depends on how much they lose & how fast, etc. That's why I asked if there was a way to check it & see where your's is- seems like there would have to be some way....
Last edited by Robby; 11-20-2006 at 03:26 AM.
