To lsd or not to, quaife, Gilken, Guards stock
04-21-2018, 01:59 PM
#1
To lsd or not to, quaife, Gilken, Guards stock
New to my 944 turbo, 030 with leda coil overs. The rear end lifted and the inside wheel stated to spin pretty easily.. this may be just the age of the chassis. Still it seems that an lsd would be a must have for the track, even spirited street driving.
So what options are there out, factory vs aftermarket, Gilken, quaife, Guards. Any other options.
What should I expect to pay for an AOR.
With a high to turbo should I bother with anything other than an AOR
Better to buy a used trans with the LSD or put one in.
Thanks.
So what options are there out, factory vs aftermarket, Gilken, quaife, Guards. Any other options.
What should I expect to pay for an AOR.
With a high to turbo should I bother with anything other than an AOR
Better to buy a used trans with the LSD or put one in.
Thanks.
04-23-2018, 11:45 AM
#3
I recently had a OSG installed by Dimi, it’s great. No more inside wheel spin and way more planted under braking, I highly suggest it. I haven’t driven the factory LSD so I can’t speak to that experience, but considering the age and Miles in most factory units you’d probably want it rebuilt, and at that point the cost may be more than putting an aftermarket one in a cooled box. Dimi custom mounted a factory cooler pump gear on the OSG and it’s working great, cooling it without having to set up a custom cooling system.
04-24-2018, 12:09 PM
#5
Race Car
Only way I'd pay top dollar (I would not buy used personally because I can repair myself) for a used one is if it passed the torque locking spec test as per the manual, otherwise, it needs servicing anyway.
Now, if the price was right and adjusted for either a complete transmission with lsd in need of service or a stocked equipped "take off" Zf diff only for sale that needed servicing, that, I would consider.
Keep in mind, from the factory, there are two types, 1), option 220 lsd that goes back all the way to the early 944s equipped with limited slip, all the way up to Turbo S.
These have 2.0mm internally splined clutch discs coupled with a pressure ring and alternate external spline "steels" at 1.9, 2.0 and 2.1mm thicknesses that set your overall stack dimensions to 4.20mm less than he overall depth of your housing when measured.
The Turbo S and everything that came after, (S2) takes 2.5mm clutches.
The same alternate "steels" are available that adjust your stack height.
The difference is, the pressure ring has been machine ground to -.5mm per side to allow for the thicker 2.5mm discs.
If I were getting a "stock" take off in either "ready to install" or "needs rebuild" condition, I would look for the Turbo S or S2 40% locking as the thinner 2.0mm plates are not as easy to find.
In the event that you can only find an earlier diff in need of service, or in good working order that you want to be able to service yourself later, you can have a machine shop with a surface grinder take .5mm off each pressure ring. This gets you in the ball park to adjust with the optional thickness steels.
What I do is check my stack and just keep the middle range 2.0mm steel and machine the pressure rings on each side to achieve that correct stack height.
Doing one right now for instance that needs .012" machined to achieve perfect 4.20mm clearance.
The cup springs (what applies pressure to clamp the clutches) are 2.0mm each side which only leaves .2mm total clearance per side.
These things have to be really accurate to work as per new spec.
T
Now, if the price was right and adjusted for either a complete transmission with lsd in need of service or a stocked equipped "take off" Zf diff only for sale that needed servicing, that, I would consider.
Keep in mind, from the factory, there are two types, 1), option 220 lsd that goes back all the way to the early 944s equipped with limited slip, all the way up to Turbo S.
These have 2.0mm internally splined clutch discs coupled with a pressure ring and alternate external spline "steels" at 1.9, 2.0 and 2.1mm thicknesses that set your overall stack dimensions to 4.20mm less than he overall depth of your housing when measured.
The Turbo S and everything that came after, (S2) takes 2.5mm clutches.
The same alternate "steels" are available that adjust your stack height.
The difference is, the pressure ring has been machine ground to -.5mm per side to allow for the thicker 2.5mm discs.
If I were getting a "stock" take off in either "ready to install" or "needs rebuild" condition, I would look for the Turbo S or S2 40% locking as the thinner 2.0mm plates are not as easy to find.
In the event that you can only find an earlier diff in need of service, or in good working order that you want to be able to service yourself later, you can have a machine shop with a surface grinder take .5mm off each pressure ring. This gets you in the ball park to adjust with the optional thickness steels.
What I do is check my stack and just keep the middle range 2.0mm steel and machine the pressure rings on each side to achieve that correct stack height.
Doing one right now for instance that needs .012" machined to achieve perfect 4.20mm clearance.
The cup springs (what applies pressure to clamp the clutches) are 2.0mm each side which only leaves .2mm total clearance per side.
These things have to be really accurate to work as per new spec.
T
05-04-2018, 02:06 AM
#7
Thanks everyone. Ya I talked to him about the trans. a bit to rich for me. Turns out even though I bought a car with a rebuilt motor and a new head... I need to rebuild the motor and rebuilt the head. sooo... the lsd will have to wait.
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05-05-2018, 12:47 PM
#8
Drifting
That's actually a good deal for an AOR, it cost to play. Just to give you an idea I paid $3250 for my AOR to be rebuilt and $550 of that was in shipping and close to $500 in labor the rest was for parts. But I felt it was well worth the cost and my AOR is in great shape now, it even looks new. Your probably not going to get much of a better deal on an AOR just so you know. Bummer about your engine.
05-06-2018, 09:15 PM
#9
Rennlist Member
I have the LSD with the cooler on it matched with a M030 sport suspension. When car grabs, the back end goes to the ground and away I go. Car can corner at amazing speeds, love my beast.
05-07-2018, 01:53 AM
#10
No doubt it' a good deal. Just not the top priority today. Ya sucks about the motor, they claimed the head was just replaced less than 1k ago and it had a good leakown. 110 to 125, 8 to 30 percent on the leak down. even worse they are pca instructors with a descent reputation who both own shops. Some people will give up there reputation for a few bucks. Oh well it' going to be a fun rebuild, maybe do a 2.7 stroker.
