Need some help from the pros! - RC-Monster Forums

**Need some help from the pros! -** 06.22.2009, 04:01 PM

Here's the plan, so hear me out and help me try to solve my problem.

I am going to be building a SCX10, rock racer/trail rig. I plan on using a XL-5 ESC and Titan 12t motor out of my Slash as the power plant.

The issue is that I want to put an interior in the Hi-Lift body and need to shrink the size of the spur gear to do it. If I drop down to a 24/54 or a 21/54 according to BrianG's calculator I can hit the speeds that I am looking for. (7-cell NiMh and 2.2 tires)

I want to know if I will blow up the motor by doing this as according to the calc, it will be running around 30k RPM, and I always get the overheating warning when I plug any values into the 540 brushed motor sizes under 35t.

So how do I resolve this. I want the best of both worlds and have seen successful builds using the Slash power plant. But due to the fact that I want a smaller spur and a little more speed, I have hit a wall and need some pointers.

Thanks for all the help in advance and wish me luck as I leave for Iraq in like soon, like real soon.

BrianG · 06.22.2009, 04:08 PM

Can't help with those details, but the overheating warning is because the voltage and motor kv results in a max rpm that is higher than the max rpm specified for that motor. I didn't really know what to put there, so I used a baseline 15,000 rpm value, which probably isn't right.

Arct1k · 06.22.2009, 04:12 PM

Titan on 7cells is fine - just look at a stampede

BrianG · 06.22.2009, 04:14 PM

Also, isn't the Slash Titan a 550 motor? That would make the kv lower than a similar turn 540 motor. I've run the Slash Titan on 10 cells before it died on me.

Slowkrawl · 06.22.2009, 05:18 PM

Honestly, before you go and rig a 550 sized motor mount up, DON'T! EVERY other crawler motor you will find is a 540. Honestly, find yourself an integy 45-55T lathe motor. They are basically "cheap junk" but for $20 you can't go wrong.

magman · 06.22.2009, 05:19 PM

wish me luck as I leave for Iraq in like soon, like real soon.[/QUOTE]

Best of luck in Iraq...

06.22.2009, 08:01 PM

The issue with the 540 high turn count motors is the fact that they are slow. To quote Ricky Bobby "I wanna go fast." at least for a trail rig. I know that the 540 motors is not equal to a 550 motor, but I am limited to what I can get out of the speed calculator, at least some.

Basically I just want to know if I can run 24/54 without cooking the motor.