Many people have suggested (and implemented) flipping the shackles over to fix
a sagging rear spring. While this may fix the sagging rear end, it will have a
big affect on the kinematics of the rear suspension. In simple terms, it will
affect how the car handles.
I engineer, analyze, develop, and test vehicle suspensions for a living. I've
been working on developing some computer models of our beloved Roadster's front
and rear suspension - primarily as a research tool to improve the handling on
my race car.
The basic analysis I've been able to look at so far shows that flipping the
shackle over will reduce the car's understeer My street car, with stock
springs and a competition front stabilizer bar handles fairly neutral. With a
flipped over rear spring shackle, the car would feel more 'nervous' and would
be more prone to spin out.
I know there are some folks that might prefer this change in handling. I just
wanted to make sure folks were aware that by flipping the spring shackles over
you will make significant changes to the way the car handles, and not all of it
is due to raising the ride height.
The best fix is to replace the rear springs. Getting the existing ones
recurved would be a good second choice.
Happy roadstering,
Chris Coker
Royal Oak, MI
Original Message:
-----------------
From: lou daly lou_daly@yahoo.com
Date: Wed, 12 Dec 2001 08:26:22 -0800 (PST)
Subject: Re: sagging rear suspension
I asked this question just before you joined the list
one of the easiest though not perfect solutions was
to move the spring-to-rear-shackle attachment to
the lower position (it normally is in high position)
just look at the rear shackles and you'll see
Lou
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