spring rates
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Two examples:
1) Evasive S2000 (I'll take this down if you guys want)
Relatively low grip tires (255 non rcomp), decent amount of aero, ~90 mph average speed @ BW, and pretty damn high spring rates. Why?
They're tuning for a series of corners. At Button Willow there is a lot of time to be made up through riverside and phil hill, a lot. Its a high speed section with transitions, where its very difficult to be flat. This demands high speed stability, something the S2000 lacks. So they run a lot of spring. The S2000 is so good from the factory that you can afford to sacrifice a bit of low speed grip for high speed stability.
2) Jason's BSP AutoX S2000.
No aero, not a whole lot of power, probably ~75 mph average speed, but big rates. Why?
295mm Hoosier A6 on 18x11=G R I P
1) Evasive S2000 (I'll take this down if you guys want)
Relatively low grip tires (255 non rcomp), decent amount of aero, ~90 mph average speed @ BW, and pretty damn high spring rates. Why?
They're tuning for a series of corners. At Button Willow there is a lot of time to be made up through riverside and phil hill, a lot. Its a high speed section with transitions, where its very difficult to be flat. This demands high speed stability, something the S2000 lacks. So they run a lot of spring. The S2000 is so good from the factory that you can afford to sacrifice a bit of low speed grip for high speed stability.
2) Jason's BSP AutoX S2000.
No aero, not a whole lot of power, probably ~75 mph average speed, but big rates. Why?
295mm Hoosier A6 on 18x11=G R I P
Just trying to understand the comparison... Are you saying that high spring rates are necessary for both situations (low speed AutoX/high speed track) but it's the ultimate grip provided by the tires that defines their setups?
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From: Emmett
Billy, robrob and robinson.
It's in the book "Going Faster" by skip barber page 207 for anyone that has that book
He's actually only referring to CG as an effect on download or a tires vertical load.
The tires vertical load works for me
The other interesting thing is the evasive car is very low which effects roll center and in a way softens the suspension. Just my guess
It's in the book "Going Faster" by skip barber page 207 for anyone that has that book
He's actually only referring to CG as an effect on download or a tires vertical load.
The tires vertical load works for me
The other interesting thing is the evasive car is very low which effects roll center and in a way softens the suspension. Just my guess
Joined: Nov 2003
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From: Atlanta
I like stiff springs and big anti-sway bars. For auto-x applications, it allows me to man handle the car and make mid corner corrections because weight transfer completes more quickly and sheds the momentum that builds in the weight of the chassis as it rolls. I'm not sure if softer springs provide more grip but I can tell you that I hate trying to snake through some high speed slalom or walloms with slow weight transfer.
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From: NOVA
im running 18k front and 16k rear spoon showa's with a cusco front sway bar and 255's all around. the car is still my daily, but is being converted to a track only car. it can get a little uncomfortable on bumps. although i prefer this setup more than a soft suspension. i dont like body roll. with the car being this stiff it helps transfer weight alot quicker in my opinion which inspires confidence. the car does exactly what you want it to do. which is why i chose the stiffer front spring rate and a stiffer front bar. both inducing understeer, on a rather oversteery car. i dont think i would ever go back to something softer. you even see some japanese tuning companies running spring rates above 20k. there must be a reason for that. i think its all up to the driver and how he drives the car.
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