I bought an 88 944 this weekend with the hopes of making it a driver but there are too many parts missing and bent/rusted so it is the next in a long line of parts cars. It has the 220 option (lsd) but I am perplexed. With the back end up on jacks I spin one wheel and the other doesn't even move. Doesn't look good. The clutch is on the floor as I was told the clutch is out but that can't be the issue can it? Thanks in advance.

 

On an LSD car shouldn't the other wheel spin the other direction?

 

Both wheels should spin in the same direction.
Could be the LSD is shot, or the trans was replaced.

 

Try popping the clutch pedal up off the floor. If its just a bad master/slave cylinder the pedal can get stuck to the floor but still work if you bring it back up.

 

Are your CV joints connected to the wheels? Just a possiblitly....they could be hanging in there, it happens.

 

cv's are connected.

 

Wait, I'm confused. If the car's in neutral the other wheel shouldn't spin. If the car's in gear the opposite wheel should spin the opposite direction. Sounds alright to me.

 

Even if it's in neutral, the wheels should spin oppositely as long as one wheel is left untouched.


OT: Hey Bill (2BWise), how'd you guys end up doing at Comp? We were...less than ideal. Our PE took a crap and we didn't have enough time to retune the car, so we had to run w/ an old map we had made for last year's car...it was terrible.

 

Last LSD I had both wheels spun the same direction when up on jacks and in neutral

 

Did you have someone else spinning the other wheel? The only way you're going to get the other wheel to spin the same direction with an LSD is to have someone spin it as well. Are you sure it had an LSD? Are you sure is was working or rebuilt properly?

Ended up 4th. This was the first time we've finished the Enduro in five yrs and the first time finishing with a Honda motor. What issues were you having with the PE. The only issues we've ever had is someone welding on the frame with the PE connected, fried the darn thing.

 

Car off the ground, transmission in neutral, spin one wheel forward, if other wheel spins forward in the same direction, it is LSD, if it spins the opposite direction, it is not, or it is broken.

Regards,
Russell

 

The tires should spin the same direction with LSD, when turning 1 wheel only by hand, and in opposite directions with non lsd. In high mileage transaxles, the clutch packs in the diff will wear out, and allow them to slip. Hence, you will turn one wheel by hand, and the other will not turn.

If you pop your cv axles loose, and spin the output shafts by hand, the other will probably spin, because it no longer has the weight of the other wheel to rotate.

 

thats what I thought rberry.

 

What style LSD came with the 944's? I do not have any experience with whatever LSD came in the 944, but every LSD that I've dealt with works the opposite way.

 

What type of "LSD" are you familiar with?

Factory 944 is a ZF (brand) Clutch type, which is a true friction type limited slip differential. 40% locking loaded, 40% locking unloaded. Even a slightly functioning (very worn out) stock 944 factory LSD will turn the other wheel the same direction. This method is testing the unloaded lock. To test the loaded lock, you need to turn the input shaft (engine, driveshaft).

Torque biasing diffs (which are not limited slip diffs) will have approx 0% unloaded lock, so it basically functions as an open diff when unloaded. The other wheel will either not move, or spin in the opposite direction.