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Author Topic:   Help, too much left front lift!
locknload
Dirt Roller

Total posts: 13
posted September 18, 2005 07:52 PM  
Last night went to a 3/8 mile clay track, very tacky all night(we are not use to tack, home track always very dry slick).4-z l/r clamped. lf-800, rf-750,lr-300,rr-250 w/spring on top of housing. In our heat the car was very pushy on the throttle carring the left front about 12-18" off the ground, car was fast just couldnt drive of the corner very well. For the a-main we unclamped the lr and locked it to the birdcage, moved the spring behind, went in the corner much looser and when the driver hit the gas it instantly lifted the lf about 18-24" but it drove almost perfect thru the turn and continued to carry the lf all the way down the straight gaining height. Why do we get more lift with the spring behind unclamped? what can we do to bring the lf down to around 6". I feel we can be faster and give the driver a little more control this way. Thanks.

37mod
Dirt Full Roller

Total posts: 36
posted September 19, 2005 08:43 PM  
I had the same problem. If the car is tight in the center and the rear end won't slide out at all, you can take some angle out of the panhard bar. This will unload the RR a little and let it slide. The TACKY track will give you plenty of side bite. Might also try a 25# stiffer RR spring(this could make the car to tight going in) and less LR top bar angle.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted September 20, 2005 01:07 PM  
Are you running a coil-over on the LR?Or an eminator and seperate shock??

locknload
Dirt Roller

Total posts: 13
posted September 21, 2005 11:59 AM  
slider on lr, shock in front. Could it possibly be too much left rear bite, (65lbs) but with it floated behind it unloads off or the spring quicker? I dont know what angle the left rear bar is at but we have 4 positions and that night we had it 2nd hole from the bottom. Thanks for your help!

irace74
Dirt Forum Racer

Total posts: 80
posted September 21, 2005 04:18 PM  
Left front lifting is generally a result of one or a combination of 3 things. Rear roll center too low, rr spring too soft or excessive left rear bite. To settle the car down, raising the panhard bar on the pinion or lowering it on the frame will raise the rear roll center making the car looser in the middle of the corner. Less wedge (more rt rear bite) will tighten the car on entry as will a stiffer rt rear spring. Less wedge and a stiffer spring will also loosen the car comming off, to compensate a stiffer left rear spring might also be required. Look at GRT or SHAW for their shassis trouble shooter, generally you want to loosen the car comming off to set the left front down. The trick is what do you do to tightrn it up comming off with out the left front getting away from you.

JT54
Dirt Maniac

Total posts: 170
posted September 22, 2005 08:23 PM  
I fought this for along time on short 3 link car .....adjusted evrything in the rear to no avail....then I moved my front roll center from 4 inches left to 4 inches right and it made a big change.....car still lifted to much but the left front stayed down.....I finaly went from a dual spring progresive pull bar that was moving way to much to a single spring and the car drives like a dream.....I dont know if this would help you but I thought it might help someone....good luck..JT

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