krissoto

iTrader: (3)

I am following the instructions on setting the pre load on the drag bar that I have from UMI, states to jack up the front of veh and get tires about 1/2 in off the ground, measure to the bottom corners of door jams, and try to set ps about 1/16 higher than ds. All that I understand, my question is does the wheel/tire combo effect the overall preload. Right now, my car has the street set up with 17 in tt2's, but my drag pak set up is 15 in prostars 325/50's in the back, and a 15x3 in the front that I think is a 86 or something. Anyway, with that being a smaller tire, will this put more of a preload on the car, and would this in fact hurt me. Its no big deal to swap wheels and tires, but then when I switch do I need to be constantly changing the preload?

Detroitmuscle

iTrader: (16)

I would think as long as the tire height from driver to pass sides are the same that it shouldn't have any effect but make sure your sitting in the car when its set.

krissoto

iTrader: (3)

even tho the instructions don't state whether to be in the car, that is the correct way to do it? and the front tire reads 165/15r/86t

Detroitmuscle

iTrader: (16)

with you in the car is the correct way to set it. the size isn't a big deal as long as the two rear tires are the same height (im sure they would always be but some people put w/e on there to push the car around)

robsquikz28

iTrader: (246)

get someone in the driver seat or fill that seat with weights that add up to your weight. Then make the adjustments...Tires wont matter that much

onfire

iTrader: (17)

My car runs straight with out any preload. If you can corner scale the car I would not try to "steer" the car with a rear swaybar.

With me in the car I have +15lbs on the pass rear tire and the swaybar neutral...drink a coke at 164mph.....lol..

NovaCain383

iTrader: (8)

I would think if you want it to be consistent the preload needs to be set in race trim. You want it to count more there than on the street. Then when you swap back to street form you want tell much of a difference just driving the car around.

Just my .02 cents worth.

krissoto

iTrader: (3)

thank you all for the post, if anyone else has anything to add go for it.