Originally Posted by
m59y
Just finished putting my E4 together and tried running on the street outside my house (I will be running on an asphalt track) - a few challenges surfaced I was hoping to get some suggestions on.
Setup is per kit with:
- 4 degrees caster
- No front droop shims - gives me ~0.5mm droop
- 4.25mm front, 4.75mm rear ride height
- Contact LMP Purple Stripe spec tire, 43mm F/R
- Battery at +1 from full rear position
- 13.5 motor, 84 rollout
Issues:
- When lightly accelerating in a straight line, the car pulls to the left, even when adding throttle very gradually. When holding speed, it tracks straight, so is not a trim adjustment.
- Setting side springs - right side spring is a half turn in to get both front tires lifting off at the same time
- If I instead add preload to the left side spring, I can get the left pull to go away, but then there is tweak as front left tire lifts way early and rear pod is obviously tilted left at full droop
- Things I have checked:
- Chassis has no rocking when put on a flat plate so doesn't appear to have tweak
- Camber is the same each side
- Car is balanced left to right
- Swapping tires side to side - no change
- Accelerating from a turn, it pirouettes extremely easily around the inside front tire (left or right turns)
- My street is low traction, but my F1 car (ball diff, Gravity tires) does fine
- I figure the spool is making this worse, and likely whatever is causing the left pull issue above.
Any suggestions?
Foam tires on a non prepped surface get hardly any traction so that will have you chasing ghosts that won’t happen once you get on a racing surface. You will want a ball diff for asphalt racing unless running on a super high bite track or the spool will make the car push something fierce