View Full Version : mono leaf coil modified setup help

07-19-2010, 10:16 AM
i have a ump modified with mono leaf coil rear suspension it has lf 650 rf 650 spring and 175 lr and 125 rr spring with 65 ibs mono leafs and a half leaf on both sides with 140 ibs of left rear the right rear leaf is unlocked it floats with 1 inch stagger fith coil has 150 spring with 2 inches of free play car was a little loose towards end of heat race track was pretty tacky we wanted to tighten car up for feature so we put a 250 spring in lr with same lr weight and no free play in fith coil car was loose on first lap no side bite or and some forward drive any ideas im thinking we should put 100 ib spring in lr and no fith coil and raising car up it doesnt seem to have any anti squat any help would be good

07-31-2010, 06:02 PM
Checkout the Fastboys thread

08-02-2010, 09:36 PM
i ran what you have and had the same problam this is what i did and it worked for me i ordered the 25lb locater mono spring and ran 175 lr and 145 rr coil over 7.2 9 inch lr sjock straight 4 rr ran 700 rf spring on a straight 6 9 inch shock and 550 lf 9 inch ran 53 cross weight 56.7 rear and 51.6 left side i mounted my leed high as i coud we ran emod tired and ran short pull bar bicuit with red and yellow bushings had 17.5 degress on pull bar at ride height it worked for me might not for you but it was fast you have to drive hard but that makes you fast 4 inch of stagger in rear 2 inch in front standerd wheel spacing rr in 1 inch left rear out 2 inch that still depends on what front end you have if you want you can call me at 317-213-2975 thanks josh at dirt parts direct