by 60's slotter » Thu Feb 07, 2019 10:33 am
I just got my blue NSR Gulf car (sidewinder) a few days ago, it's a beauty! I did have trouble tuning it also. Did the normal, rubbing compound on gears, trued and glued the rears (switch to Ultra compound), shimmed the guide, etc etc. But, it still had a droning noise coming from the body. Chassis alone was smooth and quite, but put the body on and it was horrible. Playing around I added a soft foam buffer between the top of the motor and interior - sound gone! Thickness of foam should be just enough to contact and compress a little bit. Have it set up almost snug on the rear body mount, slightly loose in the front. Pod is tight in the front and 1/2-3/4 turn on the rear screws. This car is awesome now.
I should add -- I put a 3 gram tungsten weight in the front magnet mount, and about 1-2 grams flat lead under the axle.