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Old 02-24-08, 02:36 AM   #3 (permalink)
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Russ Noble
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New Zealand
 
Join Date: Jul 2004
Location: Christchurch,NZ
GT40: Building scratc
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Re: Adjusting 930 LSD power/overrun split.

Well Jac Mac, it must be rocket science! But it works this way:- The ring gear turns the diff/LSD housing which drives the tabs on the two halves holding the 4 spider diff. This works as a normal diff. The LS effect torque transfer is achieved by a clutch pack which drives from the housing onto the diff output gear.

1st pic is diff and slip assembled up without housing.

2nd pic is housing. You can see the four slots which drive the tabs on the drive plates and diff assy.

3rd pic is is one side laid out in order. Diaphram, 3 drive plates, driven plate, drive plate, diff. The other side is the same mirror image. The drive plates and driven plate are available in three different thicknesses 1.9, 2.0, and 2.1 to adjust the transmitted torque to spec. Probably easier just to shim it up if nothings worn. The three drive plates together seem like a prime target to replace the middle one with a driven plate which would then act like a twin plate clutch and transfer more torque to the loaded wheel. 351 cubes and 14" tyres could benefit from a lot more LS drive.

Last two pics are just photos of the diff itself

That's all easy enough, I just need someone to figure out how the power/overrun LS split is achieved.

re. the pension plan. I am working on some "black gold" for the crew. Containers of used racing oil. Each team member will get 5 litres as a golden handshake on retirement. Even guys that would put P****** clutches together backwards!
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Scratchbuilt Gulf Mk1, forged, dry sumped 351W. 930 LSD & spraybar, 10s & 14s. Slowly getting there

http://www.gt40s.com/forum/gt40-buil...atchbuilt.html

Last edited by Russ Noble; 02-24-08 at 02:42 AM.
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