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Old 07-29-2008, 10:51 PM
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Improving traction?

Hey everyone,

I am thinking of adding some weight to the back end of my truck to improve off the line traction. It's a flatbead so there's almost no weight there. The gas tank is behind the rear axle and the battery is directly behind the rear bumper. Right now I have about 25psi in the back tires but am considering dropping it to about 18. It has a repop front bumper and its about half the weight of the original. Any ideas other than adding a fiberglass front end? I hate to add weight to the back but i'm out of ideas. Also are there any rules of thumb when adding weight? Say how much and would it affect 60 ft times vs 1/4 mile times?

This is the current setup,
58 Chevy PU
383 stroker
12 bolt posi rear end
Nitto Drag Radials
Cal track Traction bars


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Old 07-30-2008, 08:17 AM
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out of ideas?????
this suspension article (link) by Bill Shoppe (a very respected HR member) from the Knowledge Base link at the top of this page will likely keep your brain busy for awhile!

there are dozens and dozens of proven simple/cheap suspension tweaks that do work....
everything from chaining the motor for no torque twist load to loosening the sway bar end bushings for quicker weight transfer to adding twist in coil spring helpers to put more load to the rear etc,etc,etc

just goooogle something like: "Drag strip traction tricks and tweaks"....

one that I did, that is just a bit different, was to use rear leafs that were way to soft (actually they were worn out) so it would really squat to launch hard at the strip and then used a pair of shock absorber coil helper springs that were "free" and no tension at the coils top against the floor bottem.....
the coils only came into play and helped the suspension when there was 4 people in the car or really nasty RR tracks....
(you don't need a 1 ton spring unless there "is" a 1 ton load)
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Old 07-30-2008, 08:32 AM
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Generally speaking in terms of theory, adding weight isn't a way to go because your coefficient of friction isn't going to change, while you're adding tractive force you're also increasing your momentum and ultimately that theoretically works out to the same acceleration. The difference with more weight is that you'll burn tires faster, which usually means less traction.

Now, as far as weight transfer, you've transferred too much weight when your front end lifts. Or when your front end doesn't have enough grip to let you correct when you start going a little sideways.
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