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Turbo S Gearbox Rebuild

ikillcopiers

ikillcopiers

New member
Currently rebuilding 1991 944 Turbo (thus Turbo S) box to swap into my existing 951.

At the moment, the following parts are gonna be ordered in next few months:
* Complete set of gaskets & seals
* Rear end plate cap ("Deckel" in the Porsche Workshop Manual)
* Complete set of bearings (diff, main section, etc)
* Baulk/Blocker rings ("Synchro Rings" in the Porsche Workshop Manual)
* Spring loaded circlip in the 1st gear synchro
(Sweet Lord you would not believe how tight that mother was!
hydraulic pullers and the hot spanner, we thought it was all gonna break!!!!)
* Selector springs
* Full diff rebuild kit for the LSD

Now for the quessies!

1) Who's the best to order all this stuff off?
For most parts I've used Lindsey in the past, they seem to be very keen on price

2) Can you actually get a rebuild kit for this LSD?

3) I am hoping to build the car to more power in the future.
At the mo' it's 220bhp & 300Nm at the flywheel (dyno'd)
I'm hoping to get to round 350bhp with 400+Nm (yes, new engine, big turbo, lag & money)
Are there any week points in the box worth addressing at this stage?
Would the Porsche factory LSD be able to tame that kind of power,
or would you need to go aftermarket, ie Quaife ATB?
I'm hoping Diver944 can weigh in on this, I think you'd be a man in the know!
Also, what breed of a clutch are you using in that monster?

Yes, it's a way off till I'd be doing these big power upgrades, but when the thing
is open and out of the car, now's the time to do it in my view.
 
For the parts, ide say the only place would be a Porsche centre...[OPC]..
I dont know of any other place that would stock these items...
 
Guards Transmission in the US do some 944 bits. Bearings TBH the best way is to get all the numbers & order fromabearing specialist as that is where Porsche get theirs from.
I've just found Zim in the US which had some good pricing on bits,anyone used them? http://www.allzim.com/
 
My factory LSD is still working, but I'm sure it will have worn by now and not be doing it's 100% best. The box itself seems fine after 9000 miles with it's big engine but I don't want to risk it by upping the power levels at the moment as I think it will be the next weakest link in the chain.

Lots of trackday enthusiasts fit various aftermarket LSD's but I think the factory one does fine for a road car even with silly power levels.
 
Paul, thanks very much for the advice.

I was concerned about the diff in particular, but given your experiance,
I'm not worried anymore!
I'll have to have another look at it, but I think you can pull the diff without
completely dismantling the box.

Seems a lot like the old UR Quattro boxes.
I'll take that as no coincidence!

Hoping to get the bits and rebuild the box in the couple of months.

Tax runs out at the end of August.
Then me and Donal will start doing something silly.....
 
I have read on several forums that it is generally excepted that the stock LSD actually wears quite quickly i.e. in around 40k miles. This doesn't mean it wont be operating properly but instead of you having a 40% locking LSD you'd have something less - i.e. a slacker diff. This probably won't be an issue on a street car. If you intend to track the car enthusiastically then it might be worth weighing up the cost difference between rebuilding your diff and simply sourcing an aftermarket one.
 

ORIGINAL: VanhireBoys

I am starting to worry about that statement in particular Thomas....[:D] 
Click to expand...

You know you love it Donal!

Don't ye be fooled by the Chief Constable of the Originality Police,
he's got no problem with it comes to modifying my car!

I think the man's repressing some deep seated desires......
 
Does the OEM LSD lock equally in both directions (ie 40% accelerating and 40% deccelerating or 40% accel and 20% deccel -a 1.5-)?
 
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