Revo top speed

[wheeldean]

I used the speed calculator using the stock revo specs and plugging in the motor combo kit I purchased and it said a top speed 20+ mph Can some one tell me if I did something wrong. These are the components of the kit Neu 1515/1y/f motor, the mamba max esc, and maxamps 4s2p 6000 battery pack.

[jnev]

Did you put in the correct diff ratio, tranny ratio, gearing, tire size, etc?

[wheeldean]

I used the preset revo ratio's, the tire spec and weight from traxxas. And I varied the clutch bell and spur gear teeth count. with no big change from either

[BrianG]

Make sure you enter total tire size, not rim size. Also, are you using the Revo tranny first gear value or second gear value?

[wheeldean]

Since I planned on leaving it a 2 speed for now I tried both values.

[BrianG]

Well, if I enter values, I get ~32mph. That's with Revo diffs, 2nd gear (std ratio) tranny, 40T spur, 15T pinion, and 5.65" for the tire size.

If using the 2 speed tranny, you can get more aggressive on the spur/pinion (like 36/16) since 1st gear will give you the grunt. Also, for 4s, I would go with a 1512 2d instead, especially since you're keeping the 2 speed (but that motor will easily work with 2nd gear only).

[wheeldean]

Thanks I must have been doing something wrong. I probably will single speed the trans, but this is all new to me and I plan on taking a step at a time. I usually jump head first into projects and then end up walking away when it gets over my head.

no matter what breaks, you cant walk away from a brushless rc, it is to adictive, although you will walk away from almost every other truck around!!!

[BrianG]

No kidding! Sometimes I get disgusted with a project and let it sit for a while, but after taking one of my other vehicles out to play, I just HAVE to get the other working!

Just read around the other threads (check out the Revo tranny stickie) so you can at least know all the advantages/disadvantages before you spend money on stuff. Basically, learn from others' mistakes.