[Fot] Track width of Spitfire 1500

[MadMarx]

Maybe you have your race cars track width handy so I have values to compare.
Also how much negative camber you run so I might can advice him to run less
of it if he has much more negative camber.



-----Urspr|ngliche Nachricht-----
Von: Barr, Scott [mailto:sbarr at McCarty-Law.com]
Gesendet: Donnerstag, 26. August 2010 22:02
An: MadMarx
Betreff: RE: [Fot] Track width of Spitfire 1500

As the rear transverse leaf spring sags, the car gets lower to the ground
(including the differential mounted in the frame).  Since the rear axles are
one unit from the wheel to the differential, the lower the differential gets
to the ground the more negative camber there is at the rear wheels.  The
more negative camber there is, the wider the track will get.

This will also be effected by any change of the wheel offset or addition of
spacers to move the wheel outward from the wheel flange on the axle.  Or
longer, non-stock axles.

Up front, the lower wishbone is moved in or out by the addition or removal
of shims.  If you want negative camber, it takes addition of some shims to
get the bottom wishbone pushed outward, moving the bottom of the upright
outward to give the negative camber desired.  This would widen the front
track as well.

Does that help?

I would think some allowance for additional width over the stock track would
be necessary.

Scott



-----Original Message-----
From: MadMarx [mailto:tr4racing at googlemail.com]
Sent: Thursday, August 26, 2010 2:58 PM
To: Barr, Scott
Subject: AW: [Fot] Track width of Spitfire 1500

We measure at the bottom of the center tire.

I hope you can clear my confusion that a Spit is that wide.

Chris

-----Urspr|ngliche Nachricht-----
Von: Barr, Scott [mailto:sbarr at McCarty-Law.com]
Gesendet: Donnerstag, 26. August 2010 21:53
An: MadMarx
Betreff: RE: [Fot] Track width of Spitfire 1500

Where is the track width measured?  At the hub?  At the bottom, top or
center of the tire?

Yes, it's very common for any swing-axle car to have a lot of negative
camber as it gets lower, unless you also move the differential up in the
frame.

Scott

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of MadMarx
Sent: Thursday, August 26, 2010 2:38 PM
To: fot at autox.team.net
Subject: [Fot] Trackwidth of Spitfire 1500

Hi guys,

Question:
I have to look after the rules of our group and announced that we will
measure track width at the next event.

I got the question of a Spiti racer how he should stay under the max
track
width.

Our rules says that the max track width of that car (Spitfire 1500) is:

Front: 1296 mm = 51.02"
Rear: 1321.6 mm = 52.03"

He says, if he does use the wishbone spacers at front to achieve
negative
camber he gets over the max track width.
For the rear he claims that his leaf sping is weak, so he has lots of
negative camber and the he is over the track width at rear also.

I'm not so familiar with that car but maybe you can help me with your
experience how difficult it would be to stay under the max track width
values.

Does his trouble do come from the wheel rims? Too wide or too much
offset?
Or is this a common problem with that car?

Cheers
Chris
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