Nitro Sprintcar

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Old 03-30-2008, 02:22 PM
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Default Nitro Sprintcar

Well i've decided to build a totally new type of sprintcar,Rather than using Off road basied running gear i've gone with a Mugen MTX-3,Heres a few pictures of it so far





Now theres one problem i've now encountered,I've shortened the car 2cm to make it more to scale of a sprintcar,so of course now the side belt is 2cm too long,Does anyone have some ideas? I could setup a fancy pulley and tensioner setup but be alot easier if i could find something a little shorter than i only have to setup a tensioner
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Old 03-30-2008, 02:59 PM
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run it 2wd like a sprintcar
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Old 03-30-2008, 03:10 PM
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2wd wouldnt work too well on a touring car of this scale,will end up just going in big circles
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Old 03-30-2008, 03:46 PM
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What does it weigh?
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Old 03-30-2008, 05:18 PM
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Looks great brillant!!! I guess you would have to use a larger diameter bearing on the belt tensoner.
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Old 03-30-2008, 05:46 PM
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Weights 2kg so far which is 4.4pounds? Sound right to you
Bigger bearing is an opinton but been thinking of running bigger pulleys for the side belt which will hopefully take some of that lack out,But may mess up the gearing slighty
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Old 03-30-2008, 06:37 PM
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what tubing did you use???............Brake line tubing???......is it brazed or soldered?..................
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Old 03-30-2008, 06:45 PM
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now that is certainly cool....you have pm
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Old 03-30-2008, 07:27 PM
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genesis will keep ya updated,Just waiting on a new motor and a few other bits to turn up and i'll hit the dirt and get you some pictures and videos,Not tubing its solid High tensile rod which has been mig welded together,Tube would end up twisting too easy,Im not new to building RC's as i've been building RC stockcars which is a form of Dirt track contact racing here in New Zealand in which i've done quite well and thought i'd try have a go at building something that no one in NZ has done before
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Old 03-30-2008, 08:08 PM
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Originally Posted by RevXS View Post
2wd wouldnt work too well on a touring car of this scale,will end up just going in big circles
The BMS sprint car has been around for about 5 years and winning championships for about that long as well. This car is designed around an mtx 3 rear end, and trust me it works just fine as a 2wd
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Old 03-30-2008, 08:24 PM
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Interesting....Whats the wheelbase of your cars Jason,Im guessing your running on dirt i was building mine to run on slick concrete and being shortened in the wheelbase i didn't know how it was going to handle.... so i thought i'd make it 4wd and then try it 2wd since this is my 1st nitro sprint car i've built
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Old 03-30-2008, 08:44 PM
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Originally Posted by RevXS View Post
Interesting....Whats the wheelbase of your cars Jason,Im guessing your running on dirt i was building mine to run on slick concrete and being shortened in the wheelbase i didn't know how it was going to handle.... so i thought i'd make it 4wd and then try it 2wd since this is my 1st nitro sprint car i've built
I am not sure of the wheelbase but I could probably measure it and let you know tomorrow. I aslo have some pics, but I am not at home. I can post them later. The only thing I will say is it looks as if your car will actually push due to the fuel tank being in the rear. The BMS is almost a perfectly balanced car, and the oil diff gives it great adjustability. You can check out www.bmsrcracing.com and I also should be able to get some pics and dimensions up for you tomorrow.
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Old 04-03-2008, 02:57 PM
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My new STS motors for my sprintcar turned up,Picked up TWO for $50NZ brand new including spare conrods etc,Was a good score i thought and just happens to be the same blue as my alloy servo arms,Just waiting on exhaust to be tig welded back up as its been shortened and the clutch bell,oh and find a real cheap starter box(Unless anyone else has a makeshift idea to get it started)
Going to try finish up the fiberglass bonnet today and weld up all the mounts for it
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Old 04-03-2008, 03:47 PM
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You can use one of these to start your car.

http://www.rctech.net/forum/newreply...te=1&p=4309250

just get this too

http://www3.towerhobbies.com/cgi-bin...?&I=LXL402&P=V
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Old 04-06-2008, 06:39 PM
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New exhaust been shorten'd up and fitted to the car,Nearly ready to run the motor in
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