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Camber/ Caster/ Toe-in-out

Old 10-24-2010, 09:24 PM
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IFR Pilot
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Default Camber/ Caster/ Toe-in-out

Under what track conditions would I adjust camber, caster, toe-in/ out, negative and positive?


Old 10-25-2010, 12:49 AM
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ThunderbirdJunkie
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Default RE: Camber/ Caster/ Toe-in-out

Almost never positive camber unless the car/truck in question's got some really really funky camber curve like a C2/3/4 Corvette does.

Negative camber is the tire leaning in toward the top, positive is leaning out.

Caster in off road 2wd is rarely used, but some companies (Associated, for example) do sell different caster blocks.

For example:

On an SC10, if you go from a 25* kit-supplied caster block to the 30*, it will tone down the twitchiness of the steering, and you will get better mid corner and corner exit response. Basically, caster affects camber when the front wheels are steered; it goes negative on the outside tire and positive on the inside tire. This is to maintain a good contact patch.

Best thing to do is poke around full scale road racing sites and read read read read about all of these.

Toe in on either the front or rear will calm down the truck.
On the front, it will make the steering less responsive.
On the rear, it will induce understeer. This is the reason almost all off road 2wd kits have approx. 3* rear toe-in. Most short course trucks can benefit from even more toe-in (which is where the Factory Team kit's different toe blocks for the rear comes in) on loose surfaces.

Toe out will obviously have the opposite effect.

Camber is tuned along with your chassis roll in corners. The object of playing with camber is during cornering, you want the tire to be perpendicular to the ground for the biggest contact patch you can have.

Did ThunderbirdJunkie lose ya?

There's a lot more stuff, too, like roll center, anti/pro squat, ackerman, etc etc, but this is the basics. We'll get into advanced chassis dynamics next quarter
Old 10-25-2010, 05:58 PM
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OvalRacer99
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Default RE: Camber/ Caster/ Toe-in-out

To add to Thunderbird's post:
Caster will have a couple diffrent effects on handeling. Positive castor( king pin leaning backwards) will make the car more stable while going strait, also it will have less steering into a corner as well but have more steering on corner exit. Me being a oval guy, I like about 3 degreese of castor on the left and 1 on the right, but track conditions will dictate what works best. Off road will be a totaly diffrent set up but the priinipals are the same.
Heres a link to a short read about alighnments.

http://www.familycar.com/alignment.htm
Old 10-25-2010, 08:26 PM
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Default RE: Camber/ Caster/ Toe-in-out

Thanks for the help. I'll do more research.

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