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Old 08-25-2002, 12:28 AM   #1
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Join Date: Aug 2002
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the need for speed !!

i just got myself a orbital pro bb 17T triple to go into my offroad dirt thrasher.

i have a few questions if anyone will be kind enough to answer;

i am competing agains two other friends who also have the same car with different motors, all around the 16, 17t mark.

1. is a 19pinion a good option for straight speed

2. by lowering the cars centre of gravity, will this give me more speed.

3. i used silicon spray on my gears and bearings, is this good.

4. i am desperatly looking for other ways of speeding my car up any more ideas!!

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Old 08-25-2002, 06:30 AM   #2
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Location: Bristol, UK
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Don't know much about the Dirt Thrasher, but I'll try and help a bit

1. Bigger pinion = more top speed - but other ways to get the most out of your motor is to make sure your wiring is good, and your motor is kept clean - I hope you have an electronic speed controller - the more expensive electronic speed controllers have lower resistance, which helps speed - also, matched, quality batteries perform better than cheap stick packs. If you're using Tamiya-style white block connectors, change them for something with lower resistance and better power handling like a Deans connector. And if you're using bullet connectors to hook up the motor, change to a directly soldered link. And solder the motor brushes on to the endbell, instead of using the screw-on tabs.

2. Lower c of g gives better handling (in general), but makes no difference to speed. Lowering the cars weight will improve speed though.

3. I assume that was lubricating silicone spray - it should be ok for the surface of the gears, but i wouldn't use it on the bearings. Upgrade the kit bushings to ballraces if you haven't already.

4. Basically, a well-maintained car is a fast car. I get much more fun out of racing a car around corners as well (there's nothing as satisfying as using a slow car that's well driven to prove a point to a fast car that's badly driven) - perhaps that could be next thing for you and your friends?
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Old 08-25-2002, 01:20 PM   #3
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thanks for the info dude !

also i wanted to know if a schotkky diode across the motor makes a difference ?

thanks again, and btw we are going to race around the track but we just want to settle this bet to prove who has the fastest car over 30meters (100Ft)

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Old 08-26-2002, 12:59 AM   #4
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only use a schotkky diode with a non-reversing esc.
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