Originally Posted by TopspeedLowet
Originally Posted by dparker
What topspeed said will work in setup. In my experiences, when you go with alot more HP engine your car will have a tendency to go right. Due to striking the tires harder. Usually you need more preload. If thats the case then shorting the passenger side adjuster bar a bit will a add a little preload. I'm basing this on the fact that your car was going straight with the other engine.
Actually Dparker, a high powered car will go left, not right. The turning condition he has is no doubt, due to the rear pointing that way or random preload, old tires, shocks with unequal adjustment etc. He said that they just made an adjustment in the squareness of the diff in his first entry prior to testing the new engine, that fact may have eluded your prognosis. When you make real power in a door car like 1200 or so you will find that negative preload is your friend. I have a car that I built and drive that needs no preload at all, in fact I use 1/2 flat negative to keep from going left. But I'm only running My crap in a door car at 7.62 ET at 187.22 MPH for what it is worth.
I really don't see what your saying. I've used Ed With edvancedengines concept over the years and In my experiences have not had any problems. Not to say I'm disagreeing with you. But this is what Ed has on his chassis post....
What happens when Torque hits Rear End from Driveline;
Know and understand that anytime torque is applied that your left rear tire will be trying to push down and your right rear tire will be trying to rise looking from the rear of car. All cars in any kind of racing or activity will exhibit this twisting motion if there is any form of friction coefficient existing between the tire rolling surface and the ground/track/road. The tendency will still be there to twist the rear with torque even with no tires or wheels. It is when you start to hook that it really shows up.
If your rear end was not attached with brackets, when the drive shaft rotates in the counter-clockwise movement (looking from rear of car), the entire rear end assembly would rotate counter-clockwise like a propeller if it were suspended in the air and had room to move. The drive shaft rotates in the direction that engine torque is applied to it. Even attached with bars and suspension it still wants to rotate.
Always keep in mind that As greater torque is applied the rotational force will be greater so as power increases the car will want to pull to the right, which we counteract by suspension preloading in adjustments. If doing any bar preloading do know that even only 1/2 turn is an extreme adjustment from neutral load position. We usually preload bars in increments of portions of a nut flat when we are close. 1/2 of a flat can make a car go straight that was trying to veer to the right. Too much bar preload will pull us to the left and quickly can get us into the wall.