[Fot] Advice on Differential - Stock, Lock or LSD

[Charles WATSON]

I appreciate all the advice and comments.  To round out the picture, I am
converting to a TR6 trans and am replacing the rotoflex system with a much
beefier CV set up.  Trying to start with upgraded components where I know
there will be failures otherwise.  I like the idea of staying with the stock
3.89 if it is not ridiculously uncompetitive and then moving to the welded
diff later.  Seems like an economical progression too.

Thanks,

Chuck Watson














Subject: Re: [Fot] Advice on Differential - Stock, Lock or LSD
From: sjanzen at me.com
Date: Wed, 16 Jan 2013 13:50:44 -0500
CC: clw2000 at msn.com; fot at autox.team.net
To: jason at multivintage.com

Jason raises some excellent points on weak links in the system - my drivetrain
is virtually non-stock, with a TR4-6 transmission (GT6 ones last a couple of
weekends if you are lucky), a modified driveshaft, the welded rear, halfshafts
with spicer u-joints inside and outside, and modified uprights with larger
bearings and Corvair stub axles.
With the exception of the transmission, this is the way the car came to me, as
it was raced in SCCA club racing back in the day.




On Jan 16, 2013, at 1:04 PM, jason at multivintage.com wrote:
Hey Chuck, lots of interesting feedback here. If I were in your position, I'd
buy a couple good used 3.89's. (From a reliable used Triumph parts guy, like
TSI or similar trusted source)
Speaking from experience and paying specific attention to what Steve said. (He
went through slow progression of set-ups that actually get harder and harder
on the drive train with each developement) Like all of us GT6 guys, you will
be embarking on a long path of finding drivetrain solidity that fits your
driving style. In this process, you are most likely going to destroy a few key
components. (Every one of us has). Perhaps, for  the process of learning how
to drive this car at hi speed and getting it initially sorted. For your first
season, you may be very wise in the pocketbook, to start a regular old (good)
stock diff.
I think that (specifically for the gt6) you can take the Quaife off the table.
In the end, I agree with Scott and Steve; the welded set up is the advanced
choice.
BUT, its effectiveness leaves no room for errors in the transition between
gears. Perfect rev matching is required and lots of seat time prior to a
"trick" diff. may serve you well.

Jason Ostrowski
Friendly Ghost Racing
------Original Message------
From: Charles WATSON
Sender: fot-bounces at autox.team.net
To: FOT List
Subject: [Fot] Advice on Differential - Stock, Lock or LSD
Sent: Jan 16, 2013 7:29 AM

Well my GT6 has O/D and so it was supposed to have the 3.89 ratio diff.  But
I
have found that was swapped out at some point to a 3.27.  I want to go back
to
a 3.89 unit.  Any good sources for one?  And for road racing, should I go
stock, weld it, or go with a LSD.  I hear of a lot of failures with the
Quaife
units - so I hate to throw a grand at that product.  Any advice is
appreciated!

Thanks,

Chuck Watson
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