TT02BR with 8.5t brushless

[TomGee]

So…I finished the above build last weekend, took it to the garden for a shakedown and, probably unsurprisingly to most of you, came away with lots of jobs to do!

All suspension mounts and anything under load unscrewed/worked itself loose (no threadlock for a test run).

One of the ball head screws sheared off and now needs drilling out of the aluminium hubs. For now I’ve moved the rods to the other hole in the hubs but that means I’ll be running some serious negative camber!

The motor moved in the mount so the pinion gear no longer engaged with the spur gear!

 

On the plus side, I never had an RC car that could do donuts with ease and flip itself from standing simply by applying full throttle! The motor and ESC fans seemed to keep it pretty cool too. 
 

For info, I’m running a HW10BL 120A ESC, HW Quicrun 3650 G2 8.5t motor and 2s lipo (with a 21t pinion). 
 

So, my questions…should I stop trying now and put a more sensible motor in or do you think I could get the TT02B to handle the power? I had the 8.5t for use in a different project but thought I’d try it. 
 

Also, the pinion/spur teeth fit well (right pitch and adjustable Fastrax motor mount) but don’t feel at all smooth when hand turned - the transmission feels ‘notchy’. Is this normal? Or a problem (it was this way on the bench so the first run out isn’t to blame!). 

 

[alvinlwh]

3 minutes ago, TomGee said:

should I stop trying now and put a more sensible motor in

Sensible? Nah, don't be silly!

Here is my 8.5T to go into a car that I do not have yet! 😁

[Howards]

8.5T is reasonable for a 1:10th 4WD buggy that you want to wring the most speed out of, maybe a bit light for both speed runs and racing, but not miles off.

As you've discovered, the performance window for a TT02B(R) is narrow, probably too narrow for that amount of power. Personally, I would save that amount of power for a chassis that can reliably take it.