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Author Topic:   control arms
Dirt Roller

Total posts: 24
posted October 13, 2005 01:04 PM  
running tubular upper a arms should i run 8.5 or 9" on the left and same for right 8.5 or 8" running metric chassis on 1/4 mile track wondering what would work best and why thanks for the help.

Dirt Roller

Total posts: 24
posted October 25, 2005 07:53 AM  
any ideas

Dirt Forum Champ
Total posts: 715
posted October 25, 2005 10:15 AM  
It all depends on the front end setting you are trying to acheive.?Caster and camber.The length affects the camber.That is the best I can say,you really need to get a "base"camber reading then go longer or shorter from there.

Dirt Maniac

Total posts: 149
posted October 26, 2005 06:29 AM  
Use the 8" on the right side for sure!!! As for the left side either will work, I think I used the 8.5" and have about 1/2" of shims. I could check for sure though...

Dirt Freak

Total posts: 344
posted October 26, 2005 07:15 AM  
Have a look at these ones they are UB MACHINE made for a metric.

RS- 15-0809-5R 8INCHS LONG 1-1/4 OFFSET
LS- 15-0829-6L 8.5 LONG 1-1/2 OFFSET

We are thinking of trying these ones.

Dirt Maniac

Total posts: 161
posted October 26, 2005 03:48 PM  
Right off hand i can't tell you what length arm you need but if you do this it will help. Set the car at the ride height that you will use for racing.Block the chassis up so you can take the R.F.spring out.Bolt the control arm back up & put the tire on.
Set the R.F camber at 3-31/2 deg. Place a jack under the lower control arm & put the camber guage on.Lift the wheel 1" at a time & check the camber.If the camber is gaining
but doing it very little shorten the stock arm 1/2" & reset the camber & check the gain
again.Most of the time on a stock setup the camber will loose on the R.F. as the wheel goes up & you do not want this at all.
Also you will get better results useing the tall ball joints on the lower & upper arms so you can get the angle right on the upper arm.On the L.F.set the camber at 11/2deg.out & jack under the chassis so as the car lifts up the L.F. will drop & you can get it right.The correct angle on the uppers is very important as is the correct length.

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