02-17-2017, 08:31 AM
Join Date: May 2016
Suspension tuning: Stadium Truck rear end bouncing
I'm prepping my Stadium to truck for racing and I'm tuning the suspension. Unfortunately the rear end is bouncing and I'm not sure what's going on.
ECX Circuit (I know, I know)
Schumacher minipin yellow compound truck tires (rear), red AKA foams, JConcepts T4 wheels.
Traxxas Big Bore shocks, stock Big Bore pistons, Losi Orange springs (2.9 rate).
When I drop the car from 8-12 inches, the front plants, but the rear end bounces (specifically, it will "hop" once). I started out with 40wt oil. Watching the suspension work, it seems like the tires are bouncing before the suspension compresses fully. I thought maybe the oil was too viscous (not responding quickly enough) so I switched to 32.5wt. This didn't eliminate the problem. With both weights of oil, dropping the car from a couple of feet (simulating over shooting a table top- hey, it happens) the car bottoms out and then bounces as before.
I haven't yet tried 30wt oil.
At the front, the truck has Schumacher stagger rib truck tires, blue compound with red AKA inserts. Traxxas Big Bores, stock pistons, Losi red springs (2.5 rate).
Race day is this Saturday so I only have tonight to make any significant tweaks. New tires/foams are out of the question before tomorrow so I'm going to have to make lemonade out of these lemons.
I appreciate any tips or hints.
Last edited by i_r_beej; 02-17-2017 at 02:35 PM.