Dark Impact Gearing Help

[max_crox]

Hi there,

I have a dark impact and Im stuggling to find the correct gearing for it. I'm running a 12 and 13 double with Tamiya 0.5 module pinions and spurs.

Can any one suggest a pinion and Spur combination for me for a tight and twisty track like Kidderminster?

Cheers.
Mark

[max_crox]

Any one?.......

Mark

[jimmy]

I dont suppose you know the internal ratio of this car do you mate?

[max_crox]

Well... using this formula

Overall Drive Train Ratio = (# teeth on spur gear / # teeth on pinion gear) x Tranny Gear Ratio

and using a 78 spur and a 26 pinion the manual says it gives a overall gear ration of 9.17:1

So Ive worked it out that the internal gear box ration is 3.05:1.

Plugging this back into the formula gives a Overall ration of 9.15:1 so I think its right.

and who says you'll never use A-Level maths again (actually I think that was more GCSE level )

Mark

[jimmy]

I didn't see that ratio in the manual, but then I didn't finish building the car yet! haha

I installed the 85t spur when building because the kit gearing is for the kit 540 motor. Even with the larger spur I thought it might be a little over geared so something smaller than the kit pinion might be in order.

I'm not really the best person to advise since I have the gearbox built and thats about it..

[DCM]

I would guess, trying a 24tooth first and working up, the biggest hangup for the car, is heat build up on the motor.