09-28-2009, 09:56 AM
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Member
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Join Date: Mar 2005
Location: Québec,Canada
Posts: 39
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LSD preload or not
Hello everyone,
I read many thread on rebuilding a LSD (115), I learned that if I want more gripp I need to add one more friction plate(clutch) on each side and take out one with the ears(4).
My problem is with the preload thing, some think you need it and others don't boder with.
My GTV 1750 is for fast road driving and autocrossing.
Do I need it or not and how I do it?
thanks
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09-28-2009, 09:20 PM
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Registered User
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Join Date: Dec 2002
Location: Stevenson Ranch, CA
Posts: 438
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This is how it has been told to me: Al the preload will do is just wear out the clutch plates. There has to be some free play in order for it to "ramp up". Check with Larry at APE for more info ( and to buy good used clutch plates ).
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Dan Walker
Stevenson Ranch, CA
67 Duetto ( Baci )
67 Giulia Super race project ( la scatola della merda di volo )
Spend more money and your wallet is lighter, and lighter is faster !!
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09-29-2009, 03:53 AM
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Member
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Join Date: Mar 2005
Location: Québec,Canada
Posts: 39
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thanks Dan,
what is your set-up 25% or higher with 2 clutch plates.
andré
GTV 1750 71 US
1300 gtJ 1968
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09-29-2009, 07:38 AM
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Senior Member
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Join Date: Oct 2004
Location: Columbia SC
Posts: 1,811
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I was going to use the double plate setup and Richard Jemison - Alfar7 convinced me not to do it. He said that it would make the car a real handfull on slippery surfaces. So I got a regular LSD diff rebuilt with the proper clearances.
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Ed Prytherch
79 Spider Veloce
85 GTV6
88 Milano Verde
88 Milano Verde
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09-29-2009, 11:42 AM
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Richard Jemison
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Join Date: Apr 2005
Location: Pensacola, Fl. U.S.A.
Posts: 1,443
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Setting up LSDs
 Quote:
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I read many thread on rebuilding a LSD (115), I learned that if I want more gripp I need to add one more friction plate(clutch) on each side and take out one with the ears(4).
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Or just swap a clutch disk for one with the "ears"
__________________
Richard Jemison
RJR Racing
http://scuderiagiallo.com
"you don`t have to listen, but you won`t win the argument"!
"Nothing that I might suggest will be legal in California"
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09-29-2009, 03:26 PM
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Member
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Join Date: Mar 2005
Location: Québec,Canada
Posts: 39
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hi Richard,
Quote:
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as the floaters come in several thicknesses, and after many years use all the floaters and end disk will need changing to set up the clearance to acheve the correct "set-up" clearence for it to operate correctly
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the inner plate are the clutch, what about the end disk? I don't have any in my set-up.
what I dont understand is when you set up the right clearance like you said, it's not a kind of preload thing!
ok let's says with no preload:
first I put away one flotters on each side and adds one clutch with the ABBA configuration,
if the new clutch (inner plate) is 2mm thick and I supressed one floater of 2mm, I should stay with the same clearance I had at first, but is it the good one?.
How do I set the good clearance?
André
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09-29-2009, 03:33 PM
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Registered User
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Join Date: Dec 2002
Location: Stevenson Ranch, CA
Posts: 438
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I think my setup gives around 45% lockup ??? I got the directions from the files folder on the alfa racing yahoo group. I got the proper clearance from Larry at APE. I had to measure each "ears" plate and choose the ones that would give me the proper clearance.
__________________
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Dan Walker
Stevenson Ranch, CA
67 Duetto ( Baci )
67 Giulia Super race project ( la scatola della merda di volo )
Spend more money and your wallet is lighter, and lighter is faster !!
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09-29-2009, 05:38 PM
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Member
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Join Date: Mar 2005
Location: Québec,Canada
Posts: 39
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ok Dan,
about APE is there any website to look at or a phone number?
I'm gonna have a look at alfa racing group also
thanks
André
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10-02-2009, 09:12 AM
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Member
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Join Date: Mar 2005
Location: Québec,Canada
Posts: 39
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tanks all for your help.
I also found in the Jim kartalamakis book good info on the subject.
André
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