Originally Posted by TwoTone
Ok, I've never been good at setting up a car. Today I ran my new/used 415 on our track.
Using a front one way I need a lot more steering, it's pushing like crazy.
Now I have the XRay set up book downloaded and have read though it.
Here's my problem, making a change to 1/2 a dozen settings can increase front steering, but how do you choose which on to start with? Why?
Loaded question, since everybody has an opinion on this, but here's my 2 cents. I just got a used TA05R and run on carpet GT, medium traction. I also run a XXX-S in VTA.
It's all about balance & weight transfer from front to back. Pushing means to much weight has move to the rear while loose (pulling) is just the opposite.
Square and balance the car first.
1) Pull the shocks & make sure the arms are free and the left camber links are the same length as the right. I tend to run the links full length and parallel so I get max corner traction. Also look at the hinge pins. Are they paralle with the chassis? No anti-squat or anti-dive?
2) Check that the both front shocks are the same length. Repeat for the rear. The front & rear don't have to be the same, just left matches right.
3) Pop the shocks on and set the ride height. I run around 6mm because the track is still dusty. As the traction comes up the ride height can go down.
5mm is our minimum. Pop the shocks off again and measure the distance from the collar to the top, they should be the same.
What this all does is make the left & right suspension the same.
4) Droop. Pull the tires & block the chassis. I use some hard plastic I cut, the trick is you want two blocks the same height and uniform across the block. I place one under each end of the chassis between the arms. Now measure the distance from the flat surface it's all sitting on (kitchen counter
) to the top of the wheel shaft. I usually start with all four wheel shaft being the same. You adust this with the droop screws (spacers & shock shaft length if you don't have droop screws.). Setting the droop screws like this makes the limits for weight transfer front to back the same.
OK...mechanically the car is neutral. Next check weight with scales (if possible) with everything installed. you want left & right to weight the same and front & rear to weight the same. Add weights if you need to but don't get carried away or sweat little differences. This is where I start, I don't do this every race or even once a week.
Springs one size stiffer in the front than the rear. Generally soft for VTA. Start with them middle top holes. A-arm holes inside. (outside stiffens the shock.) You probably end up laying the rears down A(softer) and standing the fronts up.
So.................. back you your original question.
I would first soften the front by laying the front springs down. If this doesn't help try softer front springs but it may start to dive. Droop may also be your problem, you would want to increase the rear droop (allows the rear to rise more-transferring more weight to the front) To do this you usually un-screw the droop screw, not much, maybe a 1/2 turn at a time.
Sorry about the long post, hope this helps.