old intimidator , gearing help needed

[dirtovalrich]

i have a older cw intimidator direct drive that i want to run a stock motor class, the track is about 160 to 180 drive line i have 3300 cells and a gt7 speed controller . the had on it a 18 tooth pinion and 96 tooth spur. and fried a motor too hot in just one min.what gearing to use would be appreciated

[Brad Ferks]

A lot on the direct drive cars depends on tire sizes. Foam or rubber tires? How big (diam) What kind of lap counts do other racers turn on the track you are running on?

I most recently ran a direct drive sprint with buggy type off road tires (read as HUGE) on a slightly longer track (supposedly 220ft runline, but never checked) with mild mods (13x2-14x2) and was geared into a corner with a 96spur and was having to run 12 and 13 tooth pinions. We were running about 32 laps in 4 min.

A stocker wouldnt be geared all that far off something like that especially with 48p gears but it might be a starting point.

BF

[dirtovalrich]

buggy tires, not shur what lap times new to electric , been doin nitro too long

[Brad Ferks]

Buggy tires are big. You dont have a lot of gear choices with 48p, so I'd start small and go from there. On the plus side everyone is going to be in the same ballpark on tire size if everyone is running buggy tires. I'd look at some of the other racers gear ratios and figure out their final drive ratio (Spur gear / Pinion gear x transmission ratio) and you should be able to figure out what is the closest you can get to off of that. Since your car is direct drive you just devide your spur by your pinion gear to compare. Best of luck.

BF

[David Butts]

If you ask around and someone says they're running a 6.00 to one final drive. To find your gear just divide your spur(for instance a 96) by the given ratio of 6.00 to find the pinion. 96/6 =16 or 96/16= 6.0 to 1.. It works for tranny cars too if you know the transmission reduction but it takes a littler more calculator time.

Throw in the fact that you are running offroad tires and they may not be, That goes under the heading of rollout then. Equal gears with tire diameters that can be up to an inch or more diffferent will do you or your motors no good.