Subject: [Fot] Spitfire Diff

From: Rod Pierce via Fot <[email-masked]>
Date: Thu, 3 Aug 2023 07:57:57 -0400

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I am considering different options for my Spitfire diff.  I'm currently
running a welded MkIV diff but I have a couple of questions.  I have read
some on the subject but I am interested in the current train of thought.

1.  What is the purpose of welding the diff? (safety/performance)

2.  What is a good option that is available today to upgrade the Spitfire
welded diff?

Thanks

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<div dir=3D"auto">I am considering different options for my Spitfire diff.=
=C2=A0 I&#39;m currently running a welded MkIV diff but I have a couple of =
questions.=C2=A0 I have read some on the subject but I am interested in the=
 current train of thought.<div dir=3D"auto"><br></div><div dir=3D"auto">1.=
=C2=A0 What is the purpose of welding the diff? (safety/performance)</div><=
div dir=3D"auto"><br></div><div dir=3D"auto">2.=C2=A0 What is a good option=
 that is available today to upgrade the Spitfire welded diff?</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">Thanks</div></div>

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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

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From: "JS Performance Motoring, LLC via Fot" <[email-masked]>
Date: Thu, 3 Aug 2023 08:54:44 -0400

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Rod,

It may be somewhat setup dependent, but on my GT6, the Quaife works well.

The benefit of the welded diff is that you have equal drive to both rear
wheels in all conditions, no matter if you are powering out of a corner, or
trying to park in the paddock...

I've run both welded and Quaife helical LSD,  I'll never go back to the
welded.  I made the swap mid- race weekend when the welded unit blew up.
The car instantly became so much more precise (if you can say that about a
GT6..).  My description was that I was driving the car instead of fighting
the car.

Many will discount the Quaife due to inside wheelspin on corner exit, my
experience has been the only time I suffer from wheel spin is when BOTH
rears are spinning and I'm going sideways.  This may come down to a matter
of rear roll stiffness.
Added bonus:  the Quaife is much easier on driveline parts.

Another option that looks promising is the Gripper plate type LSD - this
one offers some tuning options with ramp angles/preload, etc...  I've not
driven with this type, but it seems to check all the boxes.

Jason Sukey
JS Performance Motoring, LLC
440.984.7720
[email-masked]
https://www.facebook.com/JSPerformanceMotoring/

On Thu, Aug 3, 2023 at 8:24=E2=80=AFAM Rod Pierce via Fot <[email-masked]=
et>
wrote:

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<div dir=3D"ltr">Rod,<div>=C2=A0</div><div>It may be somewhat=C2=A0setup=C2=
=A0dependent, but on my GT6, the Quaife works well.</div><div><br></div><di=
v>The benefit=C2=A0of the welded diff is that you have equal drive to both =
rear wheels in all conditions, no matter if you are powering out of a corne=
r, or trying to park in the paddock...</div><div>=C2=A0 =C2=A0 =C2=A0=C2=A0=
<br></div><div>I&#39;ve run both welded and Quaife helical LSD,=C2=A0 I&#39=
;ll never go back to the welded.=C2=A0 I made the swap mid- race weekend wh=
en the welded unit blew up.=C2=A0 The car instantly became so much more pre=
cise (if you can say that about a GT6..).=C2=A0 My description was that I w=
as driving the car instead of fighting the car.</div><div><br></div><div>Ma=
ny will discount the Quaife due to inside wheelspin on corner exit, my expe=
rience has been the only time I suffer from wheel spin is when BOTH rears a=
re spinning and I&#39;m going sideways.=C2=A0 This may come down to a matte=
r of rear roll stiffness.</div><div>Added bonus:=C2=A0 the Quaife is much e=
asier on driveline parts.</div><div><br></div><div>Another option that look=
s promising is the Gripper plate type LSD - this one offers some tuning opt=
ions with ramp angles/preload, etc...=C2=A0 I&#39;ve not driven with this t=
ype, but it seems to check all the boxes.</div><div><br></div><div><br></di=
v><div><br></div><div><br></div><div><br clear=3D"all"><div><div dir=3D"ltr=
" class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"=
ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div>Jason Sukey</div><div><span></span><span></span>JS Performanc=
e Motoring, LLC<br></div><div>440.984.7720</div><div><a href=3D"mailto:jaso=
[email-masked]" target=3D"_blank">jason@jsperformancemotoring.=
com</a><br></div><div><a href=3D"https://www.facebook.com/JSPerformanceMoto=
ring/" target=3D"_blank">https://www.facebook.com/JSPerformanceMotoring/</a=
><br></div></div></div></div></div></div></div></div></div></div><br></div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Thu, Aug 3, 2023 at 8:24=E2=80=AFAM Rod Pierce via Fot &lt;<a href=3D"ma=
ilto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">I am consideri=
ng different options for my Spitfire diff.=C2=A0 I&#39;m currently running =
a welded MkIV diff but I have a couple of questions.=C2=A0 I have read some=
 on the subject but I am interested in the current train of thought.<div di=
r=3D"auto"><br></div><div dir=3D"auto">1.=C2=A0 What is the purpose of weld=
ing the diff? (safety/performance)</div><div dir=3D"auto"><br></div><div di=
r=3D"auto">2.=C2=A0 What is a good option that is available today to upgrad=
e the Spitfire welded diff?</div><div dir=3D"auto"><br></div><div dir=3D"au=
to">Thanks</div></div>
_______________________________________________<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com" rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
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</blockquote></div>

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