Very High Grip Carpet Track

I'm mechanic on a 417 for my son, and last week we were practicing on a very high grip carpet track - lay out very fast and open, but with some tight coners too.

At first we ran our normal setup using 2x E blocks in front and no spacers at the front wheels. At the rear standard setup XA in front and E block back. Droop was 6 mm front and 5 mm rear. 0,5 mm spacers all way round under the suspension mounts. Upper link mount was 3 mm both front and rear. At the rear uprights we had 4,5 mm spacers. Camber front 0,75 degr. rear 1 degr. Standard roll bars both front and rear. White Tamiya springs in front and blue in the rear. 450 cst oil in all suspensions.

With this setup we had some problems, that the car hooked into corners and tendend to make grip rolls. The rear was stable as usual.

For the first we changed the the droop to 7 mm in front and 6 in the rear. It helps a lot. Weight transfer as someone mentioned. Then we changed the front blocks to D+D and raised the roll center using 1 mm spacers all around under the suspension mounts. We used 0,5 mm spacers at the front wheels. Upper link mount now 4 mm in the front and 3 mm in the rear. At the rear we changed to HPI blue springs and changed to the inner hole on the lower suspension arm. Rear upright spacers changed to 3,5 mm. Camber now 1,5 mm front and rear. Still using 450 cst oil. We also lowered the car in the front to 4,5 mm and 5 mm in the rear. Still we use a PF Mazdaspeed body.

RC Tech

Source: RC Tech