Cosmo Kramer

Kibort can't control himself, every post pertains to his car, his lap times, his oil pressure, etc. It's a mental problem, so don't judge him. I just hope he gets the help he needs someday.

As for the OP, probably rebuilding the stock lsd is the best bet.

Carl Fausett

Correct. That OS Giken unit has yet to reach an interest level where it can afford to be made.

I do have a good used PSD unit in stock.

mark kibort

you have two?
LSD as well? i think the gears are still available from porsche.. (ive heard) but things like the 5th gear cost $1800 or something crazy

mark kibort

Troll,
You have some anger issues, and are suffering from projection. you feel better now? get some help, please. people dont like you more when you put someone down. if you havent noticed , this is a discussion board and we talk about our cars here. but if your words make you feel powerfull and strong... carry-on!

RennPartsDirect

No, All of my cars a 5 speeds but I pulled the 2J out from under the '83 that I am parting out. My '84 transmission doesn't shift that great so it is due for a rebuild one of these days. Is it worth sitting on an extra transmission for a few years just in case or selling it and just buy the parts later? I am sort of torn at the moment. None of my other cars have LSDs in them. Does it really make a difference if I never plan on racing them?

The Forgotten On

It makes a difference when it gets wet or snows.

mark kibort

got it.. yest, the older boxes are not that desirable, but still in need. the are pricey to rebuild unless you know how to do it yourself. I think if you want a real upgrade, go to the S4 transmission or 85. the borg warner sychros are really nice and make shifting a dream in the 928.

as far as LSD, on the street, you will never know.. but if you do like some spiritied driving, nothing worse than the iinside rear wheel lifting up and spiinning on acceleration. or if you like to do burn outs, the "one legger" only leaves one mark. however, with a tuned suspension and big tires, ive been able to race the 928 carefully and not have too much of an issue on some of the most demanding turns in racing. The problem really comes up when you have a lot of those turns, or you are auto crossing. that coupled with more power , and its not as fun as with a LSD.

dont listen to cosmo Kramer... my only interest is in promoting the 928 , ironically, not myself...... the folks that have the interest in finding these phantom problems, make folks believe there are issues and that they are the only ones that can solve the issues with the sales of their "stuff".
in most cases,, the 928 stock equipment works best, and even though there is not new replacement available, the used gear can work just fine.
part of the challenge of owning an very old, discontinued car! im amazed of how much of the new parts are actually still available .

mark kibort

Huge difference in the snow!

RennPartsDirect

My cars hibernate in the winter. The '83 was actually hiding an '88 5 speed underneath it. A G28/13 2J. The previous owner was turning it into a race car. I did not know that the transmission had been swapped when I bought it. Only until I was under the car recently after pulling the engine did I get a good look at the stamping under the rear flange... Should I keep it or set it free (for a large sum of money of course)?

Snark Shark

It seems to be a dilemma because the open differential cars handle almost perfectly on dry pavement. My 86.0 5-speed can even kick out the rear under power, which seems like magic to me without an LSD. I guess it just has a very fine neutral balance that makes that possible. I'd be even more concerned about the power-off behavior though. Would hate to install one, and find that it adds a ton of understeer. I guess this is why Porsche eventually went to computer-controlled variable units.

Speedtoys

It's not so tight that it has any understeer that I noticed.

Shim up an 83 RX7 sit cut out beer can metal to 100FtLbs of LSD, and it's all understeer...unless driven so WRONG, that it ends up being perfect.

mark kibort

actually, before i got into this sport, i was doing donuts and powerslides with the 928 and couldnt figure out if it was LSD or not. (back in the early 90s). actually, it drives really nice without LSD, especially on the street. the LSD doesnt add understeer, its just the opposite, when you get to that limit.

Snark Shark

Well I'm talking about power-off behavior. "coast side" I believe the LSD terminology is. Don't think an LSD can add oversteer on the coast side. I botched a downshift once and got some oversteer under braking, but it didn't seem too crazy. And yeah... I suddenly wonder if my car can do donuts. Have to find an empty lot ASAP!

mark kibort

For a skilled racer, thats exactly what the LSD willl provide. control and less oversteer off throttle. (on throttle too, as power on wheels spin of one wheel doesnt always give oversteeer. you can make power on oversteer with LSD, but there is more control coming out of the turn at a faster acceleration rate) when you have LSD and you approach a turn off throtttle, you have the full control of the rear end, vs no LSD where the back end becomes seemingly unstable.

what do you mean , "you botched a downshift and got oversteer"? did you go into a lower gear than intended and locked up the rear and got oversteer?
in this case did you have LSD or not?
if not , generally, a locked up one legged wheel will make the car unstable, but not really to the point of causing oversteer on a bad downshift. are you talking missing a downshift and you having over steer while coasting?

without decel power under braking, a open diff can make it a little unstable under decel with power off. the entire idea of the LSD is locking the two tires toether with a certain amount of slip. that slip is control in alll cases.. if you abuse it, it can be worse.. if you use it correctly, it will always be better. on the street both burn outs and decel downshifts are safter with open diff, because there is one tire that is not getting corrupted with the errror in power.

example... doing a powerslide. a open diff will still do 2 wheel burner slids, but the one tire under power is doing most of the "burning". you over burn, you still have one tire that is closer to grip for control. with a LSD, over burn, and you loop it if you dont have quick hands..... same things on the decel.

Snark Shark

My car has no LSD, and it feels very neutral, or even a little understeery off the throttle. Although I will have to drive it a lot more to really say for sure. My botched downshift was failing to blip the throttle enough to match revs, and engaging the clutch too abruptly, so I got some severe clutch-braking and the rear slid. But it recovered effortlessly. One complication is I have S4 wheels and staggered tires on an S3, which probably dials in some understeer. I imagine it would be better to have square tires with an LSD. At least on the S3 which came from the factory with square tires.