Originally Posted by
Tous7
I've started RC racing again after 5+ years, and I'm getting my XXX-S ready for some VTA racing. I have a question on gearing for the parking lot track at Harbor Hobbies (or any parking lot track for that matter). Is the basic idea to get the FDR as close to the specified minimums without running the motor too hot? Can anyone recommend a pinion and spur gear combination (64p) for either 21.5 or 27t motors on the XXX-S? Does anyone still run the XXX-S?
Thanks.
Jon
I think the legal min. FDR for a 21.5 is 4.20 but some folks finding better laps at 4.4 fdr. really depends on layout. not sure of your TR but hit gearchart.com and you can figure out what spur/pin combo will get you there. I've been running 4.20 with a touch of advanced timing on the motor...no where near thermalling...maybe 150 degrees on a hot day.