Try this: http://www.thedirtforum.com/leafspringrate.htm
It gives numbers that don't quite make sense for a transverse leaf spring
mounting, but it's an easy way to compare what you have to other options. The
spring shop will also understand this number better. It also jibes with what
you find when you measure the rate with a press and scales.
Your twitcheness and inside tire temperatures is most likely caused by too
much toe out at the rear. The cars really like to wildly oversteer with even
a little bit of toe out. Set the car up for 1/16 or, better yet, 1/8 toe in
per side. This makes the car much more stable.
Chuck
-----Original Message-----
From: Barr, Scott <sbarr@McCarty-Law.com>
To: gt6steve@aol.com
Cc: fot@autox.team.net
Sent: Tue, Jun 1, 2010 8:36 am
Subject: Re: [Fot] Spitfire rear spring rate
Thanks - I'll have to check that out. I don't have a Spit factory
anual - just the one for the GT6. Time to get one, I suppose.
From: gt6steve@aol.com [mailto:gt6steve@aol.com]
ent: Tuesday, June 01, 2010 10:19 AM
o: Barr, Scott; fot@autox.team.net
ubject: Re: [Fot] Spitfire rear spring rate
recall something like 800 Lbs for the GT6 spring. That from the
actory workshop manual.
Perhaps it's specced out in the 1500 manual?
-----Original Message-----
rom: Barr, Scott <sbarr@McCarty-Law.com>
o: fot@autox.team.net
ent: Tue, Jun 1, 2010 6:18 am
ubject: [Fot] Spitfire rear spring rate
Can anyone tell me the stock spring rate for the 1500 Spitfire's rear
pring? This would be a swing-spring.
It's time to get the car back to the frame & spring shop. The rear
pring has started to sag a little and we've now got what looks like 6-8
egrees of negative camber back there. The tire temperatures are much
igher on the inner edges than in the middle and outer edges. And the
ar's twitchier than hell - very loose.
There's a non-stock spring back there now, which is a little too light
ince I borrowed it from an 1147 car, along with its axles. I'd like to
e able give the spring shop a benchmark for how stiff the stock spring
s.
Scott B.
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