Coelacanth wrote: ↑Tue Sep 11, 2018 1:17 pm What I'd be interested to know however, is if motor and ESC temperatures would decrease a tad if someone were to change the spur & pinion gear ratio to something like 61T/23T, which puts the rollout to 1.017". I don't have a re-re Optima or Javelin but would anybody be willing to try out that ratio and let me know how the car runs?
I can check the temps with 61T/23T and see what I get. I will say, however, that my guess is that the gearing would be a little on the low side. I was running 51T/25T and felt that maybe it was too tall gearing based off the math even though the esc & motor temps were right at 120 degrees F after 15-20 minutes of bashing. So, I swapped to 61T/25T to see how it did. I definitely noticed a drop in top speed and don't think it really helped out much in acceleration.
Even with the taller 51T/25T gearing it made enough torque at almost any speed to stand up straight on its rear tires. The lower 61T/25T gearing may give a tad more low end grunt or possibly better acceleration, but what good is even more acceleration if I have back out of the throttle just to keep it from attempting back flips?
I will double check the temps & for the sake of your experiment will try a 23T pinion with the 61T spur. I'll also get an accurate measurement of the outside diameter of the tires I'm running, too, just in case they are taller or shorter than what you are using for your math.
For what it's worth, I only bash with my stuff...I don't even know where the nearest off-road rc track is. I feel that the 8.5 turn brushless motor is a pretty sweet set-up for the re-re Optima / Javelin. It is very fast and very fun to drive. I found that a high powered brushless set-up to be too much in my Turbo Scorpion and Beetle re-releases. In those I had to dial the power waaaayyyy back to keep them even remotely controllable. However, the Javelin is different. The front suspension geometry is tons better and the car is really fun and easy to drive.