LocostUSA.com

Hello, from books ive been reading they seem to describe anti-squat as a good thing which makes sense in my mind as it "pushes" the rear tyres into the road against the cars weight.

BUT then there are companies that sell kits to REDUCE anti-squat an they say this increases traction???

example: https://au.gktech.com/s13-180sx-r32-subframe-anti-squat-reduction-weld-in-kit

They say it changes Anti-Squat from 45% to 0%

So now im confused?

Yes, this suspension stuff is pretty involved, and often confusing. I went through a similar stage trying to determine what anti-squat should be. General opinion seems to be 15%-22 percent for a light car like a Locost. You can pick up some of the discussions I had in my build log here.

Cheers,


Cheers,

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Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886

The theory is the other direction - it creates a force that uses traction from the tires to push on the sprung mass to cause it to pitch less under braking or acceleration. It is the same concept as jacking forces created by roll centers just rotated 90 degrees.

It is often used to control the tire contact patch and dynamic camber by minimizing movement of the sprung mass without using heavier springs. An independent suspension would see more camber change as you brake or accelerate without it - how much depends on a bunch of things like CG height and spring rates so the answer isn't a clear cut good or bad.

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-Andrew
Build Log
Youtube

Anti's aren't inherently good or bad. They're simply another tuning tool.

I don't have any real experience with the effects of changing anti's on a car, but with a very low CoG, should not be much need for anti's in the first place. Which is fine for a Miata based build, because independent suspensions don't give a lot of anti's anyway. The line of action for a live axle goes from the contact patch through the instant center. The line of action for an independent suspension goes from the wheel center through the instant center. So as long as the side view instant center is at or a bit above the wheel center, you'll generally be fine.

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-Justin

"Orville Wright did not have a pilots license." - Gordon MacKenzie

Doesn't + anti-squat have an opposing - for braking?

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Honey anyone?

Anti dive - as far as I know that's just a front suspension thing. Of course I could be missing something since I just have a live rear axle.

Maybe "Anti-Squat" works backwards when you're "Down Under"!!!

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Mike - Read my story at http://twinlakesseven.blogspot.com/

Too much anti-squat causes a severe vibration under hard braking - sounds like a jackhammer on the rear axle.
A little is good, making it adjustable is good too.

On the rear the anti-squat geometry will also provide anti-lift under braking.

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-Justin

"Orville Wright did not have a pilots license." - Gordon MacKenzie