B4 -7.5 Gearing

[Chris Green]

Hello,

I am looking for a starting point for my B4, running on a large-ish indoor track.

GTB with LRP X11 7.5 Motor. Lipo Cells.

Thanks,

Chris.

[V-Rossi]

23/81

[Chequered Flag Racing]

ran a Nosram 7.5 on 26/78 @ Worksop over the weekend on Demon 35c saddle pack LiPo

[Medders]

26/78 with a 7.5 !!! You sure !!!!

Christ, I was going to start my new 8.5 with 23/81.

[RudeTony]

Standard spur gear with a 23 pinion on a X12 LRP 7.5 - Perfect!!

[Southwell]

I was running 24/78 last year.

[Chequered Flag Racing]

Originally Posted by Medders

26/78 with a 7.5 !!! You sure !!!!

might have been 62/87 , if I did a typo but I could take a pic if you really don't believe me

[V-Rossi]

26/78 is quite heavy, but the big pinion makes the car easier to drive, makes it less punchy. Normally I use 24/78, indoors as well as outdoors, as this ratio is the best of both worlds (smooth power delivery, easy driving and a high top end).

The choice of spur gear is personal I think, I like the 78T more, but it's nearly impossible to use small (21-22) pinions with it on the B4 and S2 without modifying the motor plate. But Neil Cragg etc. seem to opt for the 81T ones with a 22 or 23 pinion.

[Medders]

Looks like I might have to buy some bigger pinions for my 8.5.

Still can't get my head around the 26/78 . Could you fry an egg on that motor after the race?