Schumacher Mi1 belt length and CS ratio help

Post any modifications that you have to get your drivetrain and gearing setup get the most angle out of your chassis.
JimmyZ
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Drift Chassis: Schumacher Mi1
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Schumacher Mi1 belt length and CS ratio help

Postby JimmyZ » Sat Mar 26, 2011 10:14 pm

Hi guys

I'm running a schumacher Mi1 chassis, the belt setup is different from most, rather than a separate belt to the front and rear with two centre pulleys,
the mi1 runs 20t layshaft to twin rear 36t diff pulley with a 60t belt, and another 207t belt from the rear all the way to the front 36t diff pulley.

I am able to adapt a twin 32t rear diff pulley, stock 20t layshaft, and hopefully adapt a 40t front pulley to achieve some sort of CS :)

how would i be able to calculate what the ratio will be?

also whats the best way to measure belt length, the only info i have is the main belt is a 207T and the rear belt is a 60T,
can i work out how many teeth per inch or centimeter then divide by the total?

if i can fit a 40t front pulley, i should be able to use the stock belt, 4 teeth less in the rear, 4 teeth more on the front = same lenth?

would that even change anything or would the gear ratio remain the same?

sorry for all the questions but i'm having trouble getting my head around this chassis :Ono

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Valiant_012
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Re: Schumacher Mi1 belt length and CS ratio help

Postby Valiant_012 » Sun Mar 27, 2011 3:17 am

Yeah that is unusual.
Your twin pulley system would work but the ratio will be only 1.25 to one.
You could use a smaller pulley off a nitro or a pair of center pulleys in the rear diff and DIY a tensioner for your stock belt for a better ratio.
Or see if you can convert to a two center pulley set up, It looks like you have some room to move there.

JimmyZ
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Drift Chassis: Schumacher Mi1
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Re: Schumacher Mi1 belt length and CS ratio help

Postby JimmyZ » Sun Mar 27, 2011 4:00 pm

thinking about this over night, i think its going to be easier and end up with a better result by converting to a two pulley setup, like you said, there is a bit of room in there, its just a matter of finding some pulleys that fit...
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Valiant_012
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Drift Chassis: TA-05vdf
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Re: Schumacher Mi1 belt length and CS ratio help

Postby Valiant_012 » Mon Mar 28, 2011 1:52 am

Check these out. http://www.broadtech.hk/index.php?gOo=g ... wt&gcat=51
A 26-22t pulley on your rear diff driving the front would give you a nice underdrive setup from 1.5 to 1.8 to 1.
Check out the tensioner on that page, and the prices!

JimmyZ
Rally Style Drifting
Rally Style Drifting
Posts: 20
Joined: Tue Mar 22, 2011 6:40 pm
Drift Chassis: Schumacher Mi1
Location: Melbourne, Australia

Re: Schumacher Mi1 belt length and CS ratio help

Postby JimmyZ » Mon Mar 28, 2011 3:38 pm

awesome find! thats exactly what i've been looking for, thanks!

so i could just change the rear diff pulleys, and leave the centre/layshaft setup as is?
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Valiant_012
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Drift Chassis: TA-05vdf
Location: Christchurch NZ

Re: Schumacher Mi1 belt length and CS ratio help

Postby Valiant_012 » Mon Mar 28, 2011 4:30 pm

Hard to say without looking at one, I don't see why not though.
Personaly I would find a standard 36t diff pulley, you could use a TA05 one and pair it up with a 22t pulley. Add a TC5 pulley up front, and change the front belt or add a tensioner. I couldn't say how hard it is to do though.
Give these people a try for a front belt http://www.beltsforanything.com/site71.php
I haven't delt with them my self, but I hear they are good. You want 3m HTD pitch.
Hope your project works out well.

JimmyZ
Rally Style Drifting
Rally Style Drifting
Posts: 20
Joined: Tue Mar 22, 2011 6:40 pm
Drift Chassis: Schumacher Mi1
Location: Melbourne, Australia

Re: Schumacher Mi1 belt length and CS ratio help

Postby JimmyZ » Mon Mar 28, 2011 6:38 pm

I'm going to order a bunch of different pulleys, and try both ways, its tricky to work out without parts to look at and measure lol

thanks again for the feedback :up:
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JimmyZ
Rally Style Drifting
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Posts: 20
Joined: Tue Mar 22, 2011 6:40 pm
Drift Chassis: Schumacher Mi1
Location: Melbourne, Australia

Re: Schumacher Mi1 belt length and CS ratio help

Postby JimmyZ » Tue Mar 29, 2011 3:57 pm

i've ended up making a dual pulley setup, i already had a 17t and 27t pulleys, also a 32t rear diff pulley, with 36/17 front and 32/27 rear from memory i think i can achieve 1.79 cs ratio or something close to that.

should have it all assembled tonight, just need to get some belts 8-)
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