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Author Topic:   swing arm / lift arm help
wingnut
Dirt Maniac

Total posts: 134
posted October 10, 2004 08:36 AM  
we have a problem with the left rear frame and or tire coming up so far that the underslung part is hittng the housing. we have notched and lowered the frame already so low that on a slow pace/ yellow the frame will drag the ground.with the driver in the car there is 2 1/2 " of left rear shock out/ extended , which should leave 6 1/2 " left before the shock tries to pull the lr off the ground.there is 5-6 " clearance between the underslung and the bottom of the housing. at some point going down the straights it feels like the car is only running on the rr, and if the tack is tacky you can see the tire track down the straight and of course the track and the car are sideways down the straigts becaue of heating up the rr. after all that here is the question: swingarm/z LR & lift arm with coil and shock. 4 1/2 -5 shock travel on lift arm . should we be stiffing the lr spring {225} or the lift arm {250} and if so how much. is it possible to over power this type of suspension ? sorry for rambling on , andthank you for the help.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted October 10, 2004 08:44 AM  
go up to a 300 lr and 275 rr a 225 lr on a swing arm is wayy to soft, and maybe up the lift arm 25 or so pounds...
does the car drive alright, what are your rear tire temps after the feature... how short is your lr swing arm?

wingnut
Dirt Maniac

Total posts: 134
posted October 10, 2004 09:30 AM  
extreme ,
thank you, the swing arm is the short one.the left rear does not heat up at all , thr rr is considerably hotter,i don't have temps if front of me , they are in the shop.94 shocks across the rear.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted October 10, 2004 10:04 AM  
what kind of panhard bar do you run.....
one thing to consider is that you may have too much right side weight, i've found on the 4 link cars and cars with alot of roll steer and hikeup that youneed more left percent, try about 53 with no driver and go from there
if your panhard bar is long put a short bar on it'll make it bite harder and should put some more weight on the lr tire when it is loaded

wingnut
Dirt Maniac

Total posts: 134
posted October 10, 2004 04:14 PM  
we have 52.5 left side without driver, long bar behind housing, we have started at 10 degrees for heat races , and may adjust up one hole for feature. we have not played with the bar a whole lot because it seemed like we would get a lot of rear wheel hop if we would go higher. we have started with 165lbs left rear, then add weight on left rear for feature, this weight is also in the 52.5 left side number. thanks again

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