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LSD preload spec.
Posted: Sun Sep 23, 2007 8:11 pm
by GUte
G'day all.
Wanting to increase the preload in my LSD.
Can anyone recommend a preload spec for my GU 4.11 running 35 pede's?
Thanks for any help.
Al.
Posted: Mon Sep 24, 2007 7:39 pm
by Fozdick
When i set mine up, i was a bit conservitive and with a .5mm shim i ended up with 150nm up from a fairly worn (320,000ks) 85nm before.
i would check what you have now and then work up from there, 150nm works good with 33s and bitumen work, but for a car that runs simex 35s full time , maybe 200nm would be a good starting point try a .75mm shim.
Shaun.
Posted: Mon Sep 24, 2007 8:24 pm
by GUte
Good onya Shaun.
It's a job for this coming weekend.
Al.
Posted: Tue Sep 25, 2007 7:27 pm
by Fozdick
A few more tips for the job.
You need to copy a lsd plate, including the "ears",
if you dont include these it wont sit right , it is tricky to cut material this thin , be carefull !! i used a holesaw for the middle hole and then cut the outside with a thin cutting disk on the angle grinder. I bought some steel shim plate from a bearing supplies for the job. To test the preload, i cut the end off of a coulpe of old axles and welded a plate to one (to clamp onto bench) and an old socket to the other (to attach torque wrench).
Shaun.
Posted: Wed Sep 26, 2007 7:35 pm
by GUte
Thanks Shaun,
I have purchased some shim steel.
Will give it a go on the weekend.
Al.
Posted: Sat Sep 29, 2007 7:34 pm
by GUte
Shimmed the LSD today.
I did not check it prior to removing as I should have to compare.
Anyway I used 20 thou. (.50mm).
It has given me 180 ft-lb (245 n-m) at the hub.
I feel that it could have gone more.
Maybe when I get a spare moment I might up it another 10 thou. (.25 mm).
Al.