[Ron Sutton]

Originally Posted by Matt.A

Hey Ron, another question for you...

When you discussed the pros and cons of high roll/low pitch versus high roll/low pitch, I was curious if you could run one setup on the front and the other on the rear. I feel like there is a reason you haven't mentioned doing this, but if you have the time, it would be cool if you could explain what would happen from running low roll/high pitch in the front and high roll/low pitch in the back.

Thanks for all the time you've spent sharing knowledge with us amateur hour club guys

Matt

Hey Matt,

It works .... but not the best. But not for a lack of trying, as I have seen literally hundreds of racers "in transition" from old school set-ups to the new high travel set-ups try to keep their setups in the rear.

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Conventional:
• Stiff front springs
• Small, soft sway bars
• More Roll
• Less Pitch

Sample Set-up for a 3000# car:
Front Springs: 550-700#
Front ARB: 100-200#
Rear Springs: 150-200#
Rear ARB: 50-100# or … No ARB & 50-100# stiffer rear springs … or higher rear Roll Center

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High Travel:
• Soft front springs
• Big, stiff sway bar in front
• Known as SS/BB … soft spring/big bar … if no bump stop or coil bind is utilized.
• Same concept used in conjunction with travel stops: Bump Stops or Coil Bind
• Less Roll
• More Pitch

Sample Set-up for a 3000# car:
Front Springs: 300-400# (200-350# with bump rubbers or coil bind)
Front ARB: 600-1500+# (from short tracks to big tracks)
Rear Springs: 300-500#
Rear ARB: 100-200# … or No ARB & 100-200# stiffer rear springs … or higher rear Roll Center

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The problem if you allow the rear to roll too much is ... the car rolls over unevenly .... onto the outside rear tire ... and off the inside front tire ... reducing the tire contact patch on the ground in the front by half ... causing the car to push.

One key to the "less roll" set-up ... is less roll ... running flatter ... in the rear helps keeps the inside front tire planted.

Make sense?