Looks nice! Could you explain how the rear suspension works?

Interesting concept!
How do you make sure the center sping pivots freely? It looks like the rear suspension pivots around the center screw's head?

Question 12r gurus: Just ran carpet 12th for the first time. My motor was SUPER HOT !!! I dropped two teeth and it was better and still hot. My gearing is on for asphalt but at the carpet track the motor was getting ultra hot! Is that normal?? The gearing felt appropriate for the track size and layout. Komodo 19t.

I have experience with 1/12 on carpet, but could it be the fur getting stuck somewhere in your bearings or whereever that might load up the motor?

It maybe that your rears are not fully dry before you hit the track. Are you rubbing the additive into the foams with an old towel/rag, back and front in the last 8 mins before your heat starts?

If you don't it can give the effect of over-steer as the foams are still moist on the surface = slippy rear end

Mike Dunnigan, former 1/12 national champ, used to run very small fronts, but would dope the whole tire so it remained consistent for the whole race. This was a couple years ago, and he ran the "new" AE front end, which you can run smaller tires on than average. I think his fronts were in the 1.6-1.7" range. This may not be the whole story, but he did tell me about it at a race a few years ago. Super nice guy.

Hi Ral,

I dont have any 12th scale expereice but I can tell you that the KD's get HOT!! They pull huge amps and require a little different motor setup because of this. I cant help you out on Rollout as I dont race 12th scale but I can tell you that you can take a little off the edge of the brush either .010 off the trailing or .005 off the leading and trailing and it will reduce the amp draw a little and help with the heat.

But from my expereince I dont usually worry about motor temps as long as the motor is not fading more than normal during a 5 or 8 minute run and the motor is not burning up.

Hope this helps.

EA

you arent kidding about amp draw eric.with those top fuel F brushes you sent me,my KD was drawing 13.5 amps at 1.5 volts
i did like you said with cutting the trailing edge and it dropped to 10 amps.my RPM increased and the motor was one pissed off 19 turn.fast as hell.it did get kinda warm but it ran awesome.

we've been doing it for the last 3 or 4 years in 12th in the UK with fixed timing on the BRCA legal motors.
Glyn Ward aka BRM Motors in the UK 1 st posted about it on Racechat. You should try his upright brush motor on 58mmpr (2.263 rollout). He's always saying we're undergeared

Hot on only 4 cells...Not my experience.

Jason's and my KD's are 190deg after a run...that pretty warm for 4 cells.

but its all worth it!!

A quick question for all you 1/12th scale pro's, I ran my car today and it is suffering from off power oversteer what is the best way to tune this out of the car?
Thanks Brendan