Gearing on 7.5t Brushless Motor

[carlin]

Hi Guys,

I'm not the best working these calc out getting it over my head.

I'm running RB5 SP2 dropped a SP V3 7.5t motor in.

Now I was running a 8.5t X12 before with a 26t pinion was perfect for indoors.

So I have gone a hihger gearing think I may have gone the wrong way but the motor seems bang on but only time would tell or some advise be great.

At present I have put 28t pinion on the car.

This is what I'm running gearing wise

78t spur 48Dp SP V3 7.5t with 28t pinion

Any advice be great

Thanks

[Timee80]

That sounds too high rob. Id say about 23 would be more than enough

[/tobys]

Not sure on the internal ratio of the RB5, but if it like the B4/X6, I would say 26/27 should be about right - depending on track layout (tight/twisty then 26, more open then 27). I ran 26/81 on my 7.5 in the X6 around both Broxtowe and Grantham and they both seemed fine.

From what I have been led to believe, the SP motors need a larger pinion than the equivalent LRP...

HTH :thumbsup:

[carlin]

Thanks Guys

[InsideLineModels]

I'm running 26 on a 6.5 in my Vega RB5 so i'd say you are about right.

Kev

[carlin]

I'm running 26 on a 6.5 in my Vega RB5 so i'd say you are about right.

Kev

Thanks Kev

[bigred5765]

in the cougar matty runs 76x27 with a v3 7.5