If you ever get to the point where you don't appreciate your track car...
06-14-2006, 08:32 AM
#13
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Re: Supposedly...
Thanks. I have never driven a car set with preload.
BTW - The Stohr and most others have an adjustable pushrod. The reason, as explained to me, is that if you adjust corner weight with the spring perch, then the suspension is in a different position than designed (and different on the different corners). You can be on two different places on the rate curve for RF and LF (for example) and the handling will be whacky. Setting the perch to a known dimension the doing all other adjustment with the pushrod makes it more consistent and it, of course, lets you do those adjustments without screwing up the suspensiopn geometry.
I still don't see where you get zero droop though. Is it shock internals or something external (or not really zero droop, just limited droop)?
BTW - The Stohr and most others have an adjustable pushrod. The reason, as explained to me, is that if you adjust corner weight with the spring perch, then the suspension is in a different position than designed (and different on the different corners). You can be on two different places on the rate curve for RF and LF (for example) and the handling will be whacky. Setting the perch to a known dimension the doing all other adjustment with the pushrod makes it more consistent and it, of course, lets you do those adjustments without screwing up the suspensiopn geometry.
I still don't see where you get zero droop though. Is it shock internals or something external (or not really zero droop, just limited droop)?
06-14-2006, 08:55 AM
#14
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Generally to limit droop
Assuming that shock mounts are fixed, you just need to change the length - shorten the shock. You can get a shorter shock or limit (using bushings) the amount that the rod travels, or a combination.
06-14-2006, 09:24 AM
#18
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the rod will adjust shorter than the max travel of the shock...
so the maximum droop possible is limited by the pushrod. In some cases people use cables to limit droop! Not elegant but works I guess.
You could experiment with preload on the Stohr too...just adjust the perches up a bit and reset the ride-height. Not that it needs the same "help" that the Radical needs to go around turns. IIRC the Stohr has no front ARB is that correct? You could get the same initial rate increase with a little preload if you felt you needed it.
You could experiment with preload on the Stohr too...just adjust the perches up a bit and reset the ride-height. Not that it needs the same "help" that the Radical needs to go around turns. IIRC the Stohr has no front ARB is that correct? You could get the same initial rate increase with a little preload if you felt you needed it.
06-14-2006, 09:25 AM
#19
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yeah...on a Formula Atlantic (for instance)...
which has way more downforce than the Radical...you might see 800# or even 1200# springs on a car with a similar motion ratio and similar weight to the Radical. It becomes a kart with a small amount of compliance at some point.