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Author Topic:   Torque Arm
jklostermann
Dirt Forum Racer

Total posts: 88
posted October 24, 2001 12:00 PM
I need some info on torque arms. I have no idea what springs rates effect it and how, any info would be a lot of help thanks.

Racer111
Dirt Full Roller

Total posts: 46
posted October 26, 2001 05:51 PM
Longer the bar the lighter the spring.I have ran a 38-40 inch bar with anywhere from a 175-200 spring,For about every 2 inchs shorter raise it 25-50 pounds,long tracks work well with the longer bar shorter tracks short bar.When it gets slick go long and lighter.normaly 25 pds lighter.Run a 5-3 shock on the bar.Comp 3 rebound 5.

Chad
Dirt Forum Racer

Total posts: 82
posted October 29, 2001 12:44 PM
Racer111
When you suggest running the 3/5 shock on the torque arm, do you also run a 90/10 on top of the rearend housing to help with braking on non-floated brakes??? Also, how much travel to you suggest for maximum performance??? Should the spring rate be adjusted stiffer or softer to attain this amount of travel???

juniorfan
Dirt Roller

Total posts: 11
posted October 29, 2001 06:49 PM
A torque arm delays the energy transfer of the engine to the contact patch of the tire. The shorter the torque arm or the stiffer the spring on it, the less it delays the action, planting the tires faster. A longer, softer arm is usually used on a bigger, slicker track where a racer is on the loud pedal for a long amount of time; a shorter or stiffer arm tends to break traction near the flagstand(or sooner). I have seen the springs taken off the torque arm and only a shock used, and I had also seen both removed and replaced with a solid radius rod.

Racer111
Dirt Full Roller

Total posts: 46
posted October 29, 2001 07:32 PM
Only run the 90/10 if your loose going into the corner.On a 38-40 inch bar you should get around 4-5 inches of travel on the very tip.This is also the best place to put the shock.

DIRTRUNR
Dirt Roller

Total posts: 5
posted October 31, 2001 11:09 PM
how do you set pre-load on these springs? what do you look for to tell if you need to set or change pre-load?

juniorfan
Dirt Roller

Total posts: 11
posted November 01, 2001 01:42 PM
the setup sheet from your chassis builder should give a recommendation for preload. if it doesn't, give him a call. preload is simply how much you turn the slider after the plate hits the coil. nothing complicated.

jammin
Dirt Administrator

Total posts: 5060
posted November 01, 2001 01:53 PM UIN: 16262997
Preload is the initial spring rate at which you start at on the spring. You can use the same spring and with more preload have a harder spring rate on compression. It gives you a tuning tool. The more you compress the spring the harder the initial pressure will be....which will determine how much you want to cushion the contact patch on acceleration.

jammin

Racer111
Dirt Full Roller

Total posts: 46
posted November 08, 2001 05:24 PM
I prefer to use different spring rates rather than preloading a spring.I believe this is a more consitant way of doing it.

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