Originally Posted by
Lord_Darkhelmet
I'm having trouble getting the car to be smooth and less twitchy. I have changed the car to run a transverse battery by using the pivot assembly and upper deck from a 12r6. Only other change is the shock, using a one from a 12r6.
We run on CRC black carpet and I'm using the CRC spec tire. The car is not easy to drive and likes to lift the rear inner wheel. Its so responsive just breathing on the steering makes it react hard.
I have tried a soft setup like Keven H but it seems to make it even more aggressive. Soft side springs and heavy tube lube (20k) make the rear wheel lift problem even worse. I was running the dynamic caster block at 10deg and changed it to 5deg, this was the only adjustment which made the car somewhat easy to drive. I have no idea why a soft rear setup is not helping. A fellow racer has a CRC car running soft setup and the car is super smooth to drive.
Attached is my current setup that is somewhat driveable. I hope someone can see something I missed. The only thing I was thinking was to remove the 1mm lower arm spacer and make the front end narrower. I have also tried a high amount of steering expo and turning down the dual rate.
your tires are quite big. With small tire split (like your 1mm), the first reaction of the car is fast. You can add more tire split to help with this, like 1.5mm.
Also widening the front (from axle) calms the the front. Also widening the rear to 171-172mm helps, car doesn't react and rotate so much with wider rear.
It would help if you posted images of your car? Most important one is from front, sideview that shows kingpin caster angle.