LRP X12 10.5 gearing in an SC10

[Team No Idea]

Hello chaps......right im a tad lost in the land of gear ratios. Bit too complicated for me!.

Ive fitted an LRP X12 10.5 to my SC10. I have ran the truck in the past using a Novak 6.5 motor and had a few overheating issues. I ended up dropping the the spur gear to a 78 tooth.

Now here comes the complicated bit.... in the motor instuctions it says to run the 10.5 at a ratio of 9.0:1 for "truck off road". erm so any ideas what pinion i should be using? . I did have Gear ratios explained to me a while ago but for the life of me i cant remember a damn thing about it!
any help would be fabbo!

Thanks!

[graveltrap]

In the Factory Team Manual AE are now recommending a 19 tooth pinion with an 84 tooth spur for a 10.5 motor.

With the 78 try an 18 tooth pinion, although I am not sure it will mesh!

[Hog]

Martin - at the fete the other week I ran with an 18 pinion on the kit spur - and that was with a 6.5 in on the Losi Excelorin ESC. Got hot but not stupidly so, and was plenty quick enough.

Hope to race against you on Sunday with the old battle wagon :-)

Dave.

[twisty]

Originally Posted by Team No Idea

Hello chaps......right im a tad lost in the land of gear ratios. Bit too complicated for me!.

Ive fitted an LRP X12 10.5 to my SC10. I have ran the truck in the past using a Novak 6.5 motor and had a few overheating issues. I ended up dropping the the spur gear to a 78 tooth.

Now here comes the complicated bit.... in the motor instuctions it says to run the 10.5 at a ratio of 9.0:1 for "truck off road". erm so any ideas what pinion i should be using? . I did have Gear ratios explained to me a while ago but for the life of me i cant remember a damn thing about it!
any help would be fabbo!

Thanks!

You went the wrong way on the gearing by putting a smaller spur gear,you either needed a larger spur gear and/or a smaller pinion to gear the car down,this would make the car quicker off the mark[less load on motor batterys etc] and slower top speed.

A 6.5t motor is also better suited to touring car sized wheels[10.5 should be better suited and run cooler],if i were you i would gear it down as much as you can to try and compensate for the high revs of the motor,if it`s still getting too hot,try turning the power down if you can with your set up.

Truck or buggy wheels are bigger,they gear the car up,so a lesser KV motor works better for those types of cars.

HTH
S.

[mark christopher]

i run 87 spur 23 on a ballistic 10.5 out doord and 21 or 22 in