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Re: adjustable shock tuning?

To: James Creasy <james@thevenom.net>
Subject: Re: adjustable shock tuning?
From: "John J. Stimson-III" <john@harlie.idsfa.net>
Date: Mon, 28 Apr 2003 16:14:34 -0700
This is coming from a very theoretical point of view, given that my
"racing" shocks are non-adjustable and the extend of my input into the
valve spec was "I want to go fast".

I assume that you've read Koni's instructions on how to get in the
ballpark:  Set compression and rebound to full soft, then up the
compression until the wheel stays on the ground going over normal
sized bumps at typical racing speed -- stop before the chassis gets
launched in the air going over the same bumps.  Then increase the
rebound until the body motion on turn-in and braking is a smooth,
quick, single motion.  I may not have gotten that exactly right, but I
hope you have the real thing in your hands and can refer to it.

Once you have the compression setting right, you shouldn't have to
touch it again.

To reduce corner exit oversteer, stiffen front rebound
To reduce corner exit understeer, soften front rebound
To reduce corner entry oversteer, soften rear rebound
To reduce corner entry understeer, stiffen rear rebound

Don't try to make tuning decisions based on old worn-out tires -- some
sage advice passed on to me yesterday by Mr. McKee.

Finally, when you get thoroughly frustrated with all the confusing
adjustments you can make, give the shocks to me as revenge for my bad
advice :-)

-- 

john@idsfa.net                                              John Stimson
http://www.idsfa.net/~john/                              HMC Physics '94

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