Originally Posted by
Justin33
Just getting into 1/12th again gonna be running a bmi db12r and looking for some gearing advice i'm running a murfdogg 17.5 with a lrp sxx stock spec v2 esc running max boost and timing not sure about tire diameter but it'll be the crc tires straight out of the box. Any help on spur and pinion size would be great thanks alot.
Run a roll out of 100mm in 17.5. That's a 56 pinion with a 76 spur with 43mm tires. Temp you motor after 2 min and gear up or down to stay lower than ~155 deg F. If you are at 100mm roll out and the motor is cool bump up the timing 5 deg at a time until you are around ~150deg.
Check your lap times as gearing up or increasing timing with no lap time improvement means you are over geared or over timed. You may never get to 150 deg if the room is cold.
If you are running on carpet cut your tires to 41.5mm F/43mm rear or your car will be traction rolling/lifting/diffing out.