How to overhaul my LSD
02-07-2003, 04:19 PM
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How to overhaul my LSD
Has anyone overhauled their LSD. How big a job is it and exactly what is involved. I have searched but can find no info. EDIT -: I am asking as a while ago I posted about a slight rattle on shutting down the motor, I feared DMF failure but the view seemed to be that it could well be the limited slip diff.
TIA.
<img border="0" title="" alt="[Frown]" src="frown.gif" />
TIA.
<img border="0" title="" alt="[Frown]" src="frown.gif" />
02-07-2003, 05:58 PM
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What is the matter? Are the clutch plates worn out and needing replacement? I think it was posted before that Powerhaus has replacement plates that are more durable.
02-07-2003, 06:21 PM
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Thanks for the post Greg. I have searched under Powerhaus and plates but can turn nothing up.
I have never stripped a LSD so have no idea what the issues might be. My thinking is that it is worth trying as it sounds a lot cheaper than a new clutch and flywheel, and it can do no harm to renew the internals.
I am summising that the plates could be worn the car has done 36K miles but I have no idea of the life expectancy. There must also be other internal parts that can wear.
Equally I have no idea as to any checks that could be carried out to establish with more certainty what this rattle (it is not what I would call a serious rattle) might be.
I have never stripped a LSD so have no idea what the issues might be. My thinking is that it is worth trying as it sounds a lot cheaper than a new clutch and flywheel, and it can do no harm to renew the internals.
I am summising that the plates could be worn the car has done 36K miles but I have no idea of the life expectancy. There must also be other internal parts that can wear.
Equally I have no idea as to any checks that could be carried out to establish with more certainty what this rattle (it is not what I would call a serious rattle) might be.
02-07-2003, 06:38 PM
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Just spotted this which coincidentally is being discussed at the same time!
<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic;f=11;t=000347" target="_blank">http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic;f=11;t=000347</a>
Steve Weiner has some interesting observations on the 993 LSD (and I really do hold his opinions in the highest regard) it sounds as though at this mileage my LSD is probably worn out. The next question has to be is it worth overhauling or should I consider a complete replacement from another manufacturer.
<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic;f=11;t=000347" target="_blank">http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic;f=11;t=000347</a>
Steve Weiner has some interesting observations on the 993 LSD (and I really do hold his opinions in the highest regard) it sounds as though at this mileage my LSD is probably worn out. The next question has to be is it worth overhauling or should I consider a complete replacement from another manufacturer.
Trending Topics
02-07-2003, 07:52 PM
#9
Paul Guard at GT, very nice peices, hold up under duress well(read racing for 3 years on same diff w/ no percieved change in performance). Nice side benefit was the stabilizing effect on deceleration. Hope that helps, email me if You need contact info.
02-07-2003, 08:01 PM
#10
Another great option, but probably more expensive is the GT2 Diff from Porsche, it is ramp style as opposed to plate if I remember correctly. There was a number of GT2 pieces available in the Classifieds a couple of weeks ago including a 993 GT2 gearbox which was geared for I believe a 160 Top End, with some spare gearsets also. Total cost was like 12,000 for that piece and the spares I think. That would be a direct bolt on and bullettproof also. The GT2 case is extremely rare and I believe was like 32k for a new box I believe.
02-07-2003, 09:52 PM
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FWIW...
I found my G50/21-2 factory LSD lost its LSD-ness last fall at about 30K miles. I pulled the unit myself after discussions with Steve W. regarding the various upgrade / "beef up" options. I sent it up to him expecting to do the "Paul Guard" clutch plate upgrades.
In the end, the coolest thing about sending it up to Steve was that my diff carrier turned out to be the style normally used within turbo G50's, known as an 80/20. The Guard pieces would not work on that carrier body / ramp style. So instead, Steve worked some blueprinting magic and beefed my unit as best as he could be eventhough it was the turbo carrier.
Message here, once you pull your carrier, make sure it is the style that lets you use the Guard pieces before committing to the parts.
In the end, I was very happy with Steve's work. He saved me the hassle of learning the specifics once torn down and still got the job done for me within schedule and budget. It is also worth noting that I was quite pleased with his turn around time. I mention all of this because I ran through the scenarios of having UPS lose the darn thing and having to go through the hassles of setting the ring / pinion clearances of a different diff carrier, etc. After doing the trans swap to install the G50/21-2, I do not want to do another G50 6 speed install again...for a while...
Hope this helps
Regards
I found my G50/21-2 factory LSD lost its LSD-ness last fall at about 30K miles. I pulled the unit myself after discussions with Steve W. regarding the various upgrade / "beef up" options. I sent it up to him expecting to do the "Paul Guard" clutch plate upgrades.
In the end, the coolest thing about sending it up to Steve was that my diff carrier turned out to be the style normally used within turbo G50's, known as an 80/20. The Guard pieces would not work on that carrier body / ramp style. So instead, Steve worked some blueprinting magic and beefed my unit as best as he could be eventhough it was the turbo carrier.
Message here, once you pull your carrier, make sure it is the style that lets you use the Guard pieces before committing to the parts.
In the end, I was very happy with Steve's work. He saved me the hassle of learning the specifics once torn down and still got the job done for me within schedule and budget. It is also worth noting that I was quite pleased with his turn around time. I mention all of this because I ran through the scenarios of having UPS lose the darn thing and having to go through the hassles of setting the ring / pinion clearances of a different diff carrier, etc. After doing the trans swap to install the G50/21-2, I do not want to do another G50 6 speed install again...for a while...
Hope this helps
Regards
02-07-2003, 10:12 PM
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Sounds like a Flywheel problem not a LSD issue.
But if you can confirm that the LSD will need to be replaced and the tranny will have to be removed. Then you will be able to have a great look at the clutch and flywheel while you are there. Replace the LWF and clutch and you won't be disappointed.
FWIW If you guys want to upgrade to a real zf type diff let me know and I will put you in touch with my mechanic who has some re-built ones that he could sell.
I have a Guard TBD in my race car and it has never had any problems but may upgrade later this year to a ZF diff.
But if you can confirm that the LSD will need to be replaced and the tranny will have to be removed. Then you will be able to have a great look at the clutch and flywheel while you are there. Replace the LWF and clutch and you won't be disappointed.
FWIW If you guys want to upgrade to a real zf type diff let me know and I will put you in touch with my mechanic who has some re-built ones that he could sell.
I have a Guard TBD in my race car and it has never had any problems but may upgrade later this year to a ZF diff.
02-08-2003, 04:22 AM
#15
RL Technical Advisor
</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by Greg Fishman:
<strong>
(snip)
I have a Guard TBD in my race car and it has never had any problems but may upgrade later this year to a ZF diff.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Hi Greg:
If you install the clutch type, instead of your Torque Biasing diff, you will be amazed at the difference,......
Use either the Guard Transmission one or one of the Motorsport diff's and you'll be pleased.
<strong>
(snip)
I have a Guard TBD in my race car and it has never had any problems but may upgrade later this year to a ZF diff.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Hi Greg:
If you install the clutch type, instead of your Torque Biasing diff, you will be amazed at the difference,......
Use either the Guard Transmission one or one of the Motorsport diff's and you'll be pleased.