vee8 wrote: BillyShope wrote:
vee8 wrote:Does the height of the tire as in air psi or diameter affect anti squat?
Certainly, since both center of gravity height and instant center height are affected.http://www.racetec.cc/shope
So to expand on this to set a car up correctly do I need to figure the expanded size of the tire?
If you have your ladder bars too high and you do wheel stands then you drop them 1 bolt hole (1 in ) and the tire speed goes up tooo much. How would I get right. Do you raise the whole car or just the front or back?
To be dead nuts on, with tire growth, you would have to get pictures of the car at rest and picture of car while tires are grown at launch, then measure your front suspension points difference from the ground. Since most just guess at center of gravity anyway, I just figure a little underground level for rear point of neutral line. Note It doesn't make any difference how much the tires grow down track other than gear change.
When raising or lowering a car, you change two things. The forward mounting point position of rear suspension and the center of gravity. Look where these are located and it will tell you which end to work on, up or down.Raising front will raise the COG more than IC line and raising rear will raise IC line more than COG. Simple rule is, if you want an IC change do it at the rear. If you want a COG change do it at the front or both. Note, these are smaller adjustments than changing a bolt hole or raising an engine. After all the experimenting you will find the COG, especially height, is way more important than the IC. It is the relationship of the two and how much power, that makes a car work. It gets a little more complicated than that but just to maintain compliance to track. If you get an anti squat a LITTLE below 100% and spring/shock it to eliminate squat, the rest is GOC placement, given you have good slicks. This will give you compliance for track bumps and the COG gives the weight transfer. The restricting or enabling of the front suspension regulates how fast and how much you get.