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

[Chuck Gee]

Or you could just buy mine and skip all of this development stuff. ;).

Chuck

On Jan 16, 2013, at 12:01 PM, Charles WATSON <clw2000 at msn.com> wrote:

> 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
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> 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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