How much will adding 16 lb to my car affect ET/mph(rotating weight)

Cudafever said
I have been wanting to experiment with chassis mods with my SS Spring...... More accurately Torsion bar tuning.

When i do my burn out the rear kicks out to the right, when i loose traction down the track it wants to go right also.
with these skinny cheater slicks, it was painfully more of a problem.
So after i had done all i could to make it go down the track with my right foot..........I got my big long 1/2 inch beaker bar out and 3/4 socket. Slide under my car and loosen the torsion bar 1 full turn. (right side only)
Burn out and launch seem to be just a little less of a sideways spin. So i turned it one more full turn looser. I know for sure, now, i'm going in the right direction!!!!!
After a couple more passes i climb back under and give it one more full turn looser. Burn out is straight and the launch is under control, enough, that i can even note who and what car was in the other lane.

So now its time to do a full throttle, out of the hole, and see what happens........It spun hard, as i suspected it would do.
It spun all the way through 1st gear and half way through 2nt............. The surprise was that i didn't have to lift!!!!!!!

I still had to steer it, but the fact that i could control it, and NOT lift, was AWESOME!!! I wanted to make a 2nd run and verify what i had felt and done on the last pass.................But good old Mother Nature said that's enough!!! Thunder Cloud Ended the day.

If the car is going the same direction every time, you need to roll the tires out. Do not just measure the diameter. You have to roll them out at race weight with a driver in the drivers seat. All you need is some tape, a sharpie and a square. And you need the tire pressure set where it is when you make a pass.

Get the car ready with someone in the drivers seat who is your weight or close to it. Take a piece of tape and stick it on the sidewall of the tire and another piece on the floor, then take the square and make a straight line from the tape on the tire to the tape on the floor.

The roll the car forward until the tire makes one full Revolution and use the square to make sure you are one full turn. Put down another piece of tape and use the square to make a mark on the tape on the floor in line with the mark on the tire.

Grab your tape measure and measure between the marks on the floor. Write it down, and then go do the other side.

The roll out SHOULD a be within a half inch of each other. If they are not (lots of tires aren’t the same size) then you need to add air or remove air to make the tires roll out the same.

This is the only way I know of to accurately measure the actual diameter of a tire that wrinkles. Never played with a radial, but I suspect it needs to be done the same way.

Just measuring the diameter doesn’t take into account the side wall wrinkling.