Help with gearing/new track astro/dirt

[toddzellia]

I have a cougar sv pro are new track is half astro and dirt ,I am running a 10.5 120a motor combo,24/80 gearing stagard rib ft mini spike back.Now more power ? Change gearing ? What timing ? And help would be greatly appreciated
Cheers.

[rollingon4]

Hi there, I've been using the below as a ballpark gearing guide for my cougar:

http://www.teamnovak.com/tech_info/b...r_gearing.html

With a 10.5t motor that would mean a 26t pinion with your 80t spur to give a FDR of 8.0 if you haven't changed the internal gearing from standard. I'm no genius though so I'm sure someone has a better suggestion

[toddzellia]

Cheers but I was told that if you have a smaller pion you will have more top end but Iam no expert .

[Ralls Racing]

the advice given is correct. 26-27 tooth is a good starting point and will give more top speed

[toddzellia]

Cheers.....

[ian h]

Whenever I've ran a 10.5 I usually ran 78/27. Considering half your track is dirt I would consider a smaller spur like a 76 and a 26 pinion.
This will move the motor back slightly and help give a little more weight to the rear to aid traction.