[schung]

I am thinking to get the LSD, but not sure which one should be. Is there any one who has test Torsen / ZF type LSD? What's difference?

Also there is Quaife ATB, any one test it?

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[SANDOVAL]

[quote name='schung' date='May 30 2005, 12:17 AM']I am thinking to get the LSD, but not sure which one should be.  Is there any one who has test Torsen / ZF type LSD?  What's difference?

Also there is Quaife ATB, any one test it?

[right][post="5200"]<{POST_SNAPBACK}>[/post][/right][/quote]



I had the Guard GT LSD in my cab it was a handmade work of art. Once you install it you will wonder how you lived without it.I think I picked it up for around $900.

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[flash]

i'll second that



available at www.speed-6.com

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[Jason Judd]

I have the one from Porsche Motorsport...I'm pretty sure it's a clutch type.



I really enjoy it.



Jason

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[RS Barn]

There are two distintive types of LSD . 60's type and Auto type, just kidding.

Torsion/Quaife gear type are excellent for street vehicles. Disc type are more suited to track. it's hard to decribe, but the discs can have a higher lock and feel more planted on the track. There is definitely more transition from no lock to full lock on the gear type. either is better than none.

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[flash]

the locking ratio is highly varied from unit to unit - there is a very good article on the guard site that describes many different porsche lsd units and how they differ and what that translates to in traction - a high ratio lock disk type can help you on one track, but seriously cost you on another - choosing the right one is not as simple as disk or torsen - you have to determine what ratio you want locked and where

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[Harvey]

Dumb question but someone has to ask it....when checking to see if you have LSD, is the test the same for both clutch type and Torsen type? That is, jack up the rear, turn one wheel one direction and the other rotates the opposite direction if it's not either of the above LSDs? Can you feel a difference?



I think Raj or someone may have said that '92 was the only year they came out with the clutch type and that everything else apparently was Torsen.



Harvey

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[Eric_K]

I had a ZF style installed in my last previous car and the race car has a Quaife. They are both way better than the open diff, but I don't think you would really notice a significant difference between the types in street use. I don't really notice any difference on the race track. The nice thing about the Quaife & Torsen are that they are maintenance free. The clutch style will need occasional servicing.



Eric

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[bob blackwell]

That test has always worked for me Harvey. Another test which is more fun is to have someone watch while you accelerate briskly away in loose sand or gravel, both rear wheels send up a spray of loose material! When I am at the track and we are making a standing start I leave two black streaks from the starting line, another positive test. Good luck, Bob Blackwell.

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[Harvey]

I guess I just keep hoping against hope. Both sellers of the last two Porsches I bought iINSISTED the cars had LSD.....and neither do. And, I hate to rev to 6000 rpm and drop the clutch in front of a seller when testing his car out....but I'm now working up to that.



Harvey

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[bob blackwell]

Yeah, I agree. Better to have the owner do it with you watching from outside. If the owner is reluctant to demonstrate his claim of LSD it probably isn't installed. good luck, Bob Blackwell.

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[sasilverbullet]

I know my 93 has one, it's on the option code.



A dumb question about LSD's - Do they 'slip' some and then 'lock' when you get to a certain speed?



Reason I'm asking is because that's the way my car feels. This is my first P-car with an LSD.



Please explain!

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[NeedPorscheSpeed]

[quote name='Harvey' date='Jun 3 2005, 08:29 AM']I guess I just keep hoping against hope. Both sellers of the last two Porsches I bought iINSISTED the cars had LSD.....and neither do.  And, I hate to rev to 6000 rpm and drop the clutch in front of a seller when testing his car out....but I'm now working up to that.Harvey

[right][post="5373"]<{POST_SNAPBACK}>[/post][/right][/quote]



That really stinks, Harvey, that you were misled on both cars... <img src="/forum/images/smilies/968/sad.gif" class="smilie" alt="" />



As far as discerning whether or not a future car has LSD, you could swing by a shop, put it on a lift and perform the counter-rotational test. An even better option would be the check the options sticker for M 220. If the sticker is not present, you could call 1-800-PORSCHE with the VIN of the car in question, and they can tell you the factory options.

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[bob blackwell]

All the option code will tell you is whether it was equipped with the LSD from the factory. Many things change over the course of ten plus years. I bought a 944S2 once which the option code said had LSD and when I checked it did not, someone had removed it at some time or other. Good luck, Bob Blackwell.

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[Harvey]

Johnathan,



With that stable of Porsches that you have, how many have LSD? Can you tell much difference? In my 928, with wheel spin on the track, I definitely wish I had LSD. It would make a lot of difference. On turn 5 at the Spokane raceway, I seldom come out of it w/o smoking the unloaded side. BTW, that's the same turn that a 928 GT rolled 3-1/2 times on a few weeks ago. And he had LSD. Expensive roll. But not nearly as bad as our Porsche colleague at Fontana just had. One can get another car....



I haven't had the 968 on the track. Don't know if wheel spin will be an issue or not.



Just think, a couple more and you'll have one for every day of the week!



Harvey

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