gearing tip for 8xl ?

[speedy]

Hi !

I need a tip on what pinion to buy for a 8xl feigao motor used in a inferno 7.5 sports buggy with stocj spur and 4s lipo ? I'd like a topspeed of 40mph if possible :)
I'd like to use a bk warrior o mgm esc but witch one ? for maximum 300 $ o and how big lipopacks do i need for 20-30min runtime on a track ?

[spaz163]

I emailed Mike when I was looking to buy a pinion for my Ofna MBX buggy conversion. I am running a 8XL on 14 cells and suggested starting with either a 14 or 15 tooth pinion. I went with the 15 and it does indeed move out, might actually be alittle too quick but that will change with where ever you are driving the rig.

I have no experience with either of those controllers so I can't help you there.

20 to 30 minutes runtime is quite long, you may need something up around 8000 MaH to pull those times off. Just make sure that you have a charger that will put out enough amperage so that it doesn't take several hours to charge one pack. I believe you should stick around 1C for Lipo charging which on an 8000 pack is 8A.

[speedy]

ok! i'l buy a set of piniongears 14-16t then
How long runtimes do you get with your nimh packs ? and are they Zapped or selected ? How does your bl-buggy's preformance stand compared to nitropowewred one's ?

[Serum]

Hi Speedy;

Please check out BrianG's tool;

http://scriptasylum.com/rc_speed/

[speedy]

will a 16/46 gearing be ok for a 8xl motor on 4s ?