drag race wheel alignment

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prairiehotrodder
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drag race wheel alignment

Post by prairiehotrodder » Sat Mar 23, 2019 2:46 pm

my car is an 81 malibu with a mish mash of different aftermarket front end components. Right now it has a cheap junk set of speedway upper control arms that require a ton of shims. The car is a little sketchy at 140 MPH. I just purchased a pair of Global west drag race uppers (TLC-88) that hopefully will allow me to get rid of lots of shims and align it properly. I know that for drag racing the caster setting should be changed from factory but i have no idea where to set it. Anyone have any experience with this ?
Brian
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jed
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Re: drag race wheel alignment

Post by jed » Sat Mar 23, 2019 9:00 pm

I don't really know but I grew up in my dads alignment and frame straightening shop.
Have the car in race ready condition. What is the stance of the car when the car gets into high gear.
I would set the camber at this ride height at 0 to 1/2 degree positive. Then start with the caster at + 3'.
Also be sure to check check the toe.
Hope this helps.
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1972ho
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Re: drag race wheel alignment

Post by 1972ho » Sat Mar 30, 2019 8:25 pm

Try to get as much positive caster as you can get.

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Alan Roehrich
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Re: drag race wheel alignment

Post by Alan Roehrich » Sun Mar 31, 2019 12:23 pm

We run tall ball joints to cut down on camber change, and bump steer kits. As a rule, we run 1/8" to 1/16" toe in, and as much positive caster as possible of course, not using longer bolts or studs, or stupid amounts of shim). We align with the car raised in front around 2"-3" from ride height, with the weight of the driver in the seat. You can just about sit on your hands if you stage straight, and the track is decent.

prairiehotrodder
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Re: drag race wheel alignment

Post by prairiehotrodder » Wed Apr 03, 2019 11:25 pm

I was told to get as much negative caster by a friend. Now i need to do some research. Positive or negative. I've been a mechanic for 15 years but i've never done a wheel alignment.
Brian
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af2
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Re: drag race wheel alignment

Post by af2 » Thu Apr 04, 2019 12:23 am

prairiehotrodder wrote:
Wed Apr 03, 2019 11:25 pm
I was told to get as much negative caster by a friend. Now i need to do some research. Positive or negative. I've been a mechanic for 15 years but i've never done a wheel alignment.
Brian
Positive Caster is your friend at 150+ I run 8* with a straight axle and 1* negative Camber in case the car goes array.
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Re: drag race wheel alignment

Post by allencr267 » Fri Apr 05, 2019 5:12 pm

prairiehotrodder wrote:
Wed Apr 03, 2019 11:25 pm
...negative caster by a friend.
Try driving at medium to high speed in reverse in any thing but a forklift & you'll get you a scary dose of neg castor.

prairiehotrodder
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Re: drag race wheel alignment

Post by prairiehotrodder » Fri Apr 05, 2019 5:42 pm

Thanks guys, positive caster is correct. My new control arms which are on the way have extra positive caster built in so hopefully i can use far less shims for the alignment.
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