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set-up
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Posted by gorper (more from gorper) on Wed, 13 Oct 2004 14:06:52 Share Post by Email
In Reply to: grorper, snipes, Wed, 13 Oct 2004 13:18:58
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The axle must have camber gain. When I label (the date, plus "PR", "DR", "DF"...) my autox tires on the tread surface with a grease pencil , the writing on the rears remains for an entire event, but only on the inside. Clearly, the car is cornering on the outer edges.

From what I've read, you always have to test. But if you know the car's camber curve, suspension geometry, ride height, motion ratios, etc., you can figure out spring and bar rates on a computer and get the same roll front/rear. For my current set-up, I started with 550F/700R (rates borrowed from Brad :-). This works surprisingly well on the street with Bilstein HDs, but on course, body roll is still too high for what I want and I need to get rid of the front bar because traction is *horrible*. What's the next set of springs? Well, I don't know. But it'll cost me at least $175 in springs to find out -- I can't afford to continually test different rates, only to find that they don't allow enough roll or still allow to much. Another hitch is I'm planning on removing a couple hundred pounds this winter. There's also shock valving to deal with when you change rates. So, having the software gets you closer, more quickly, and some packages allow you to "test" the car while it turns, accelerates, and brakes, showing roll center movement, camber change, etc.

Also, a computer can run through thousands of iterations of a-arm length(s) and thus be optimized from the stock set-up. Building different arms would be pretty straightforward. This feature is more secondary for me at this point, but somewhere down the road I'd like to build my own a-arms.


Too much roll at ~2740#, 550/700, street tires:



posted by 128.95.20...

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