New Member and need help

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New Member and need help

Postby Snowball » Thu Aug 06, 2015 12:19 pm

Hi to all second season of sand drags and want to know about stager all help will be appreciated question is will it hurt anything if I run 31x 10.50x15 on a 8 inch wheel on front and 33x12.50x15 on a 10 inch wheel on back and is a 4x4
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Re: New Member and need help

Postby sandaltered » Thu Aug 06, 2015 3:58 pm

It's best to give me your rollout with the correct air pressure in the tires. They're all different circumference especially with changing wheel widths.
But I can do it for you once you give me rollouts.
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Re: New Member and need help

Postby Snowball » Thu Aug 06, 2015 9:42 pm

Like I said sir new to the game have a lot to learn like I'm not sure what you mean by rollout I ran 33's early this year and ran 10 pounds in front and 12 in the back and I'm not sure what air pressure to run with the new tires yet thank you for your help
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Re: New Member and need help

Postby sandaltered » Fri Aug 07, 2015 7:46 am

Sorry, rollout is the circumference of your tire, or the distance the tire rolls out in one revolution. Not all 33's are exactly the same circumference if you see what I'm saying.

I use a sewing tape or a thin tape measure to measure around my tires.
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Re: New Member and need help

Postby Snowball » Fri Aug 07, 2015 10:06 am

Yes sir I understand now so in need to measure the 31's and 33's around and I will get those numbers to you thank you for your help
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Re: New Member and need help

Postby sandaltered » Sun Aug 09, 2015 7:31 am

That'll work.

Hopefully the different wheels take care of it. Because running a smaller tire on the front and keeping the same gear ratios front and rear is typically a bad thing. That underdrives the front end, meaning your front tires are travelling a shorter distance than your rear tires for each revolution of the driveshaft. That tends to get really sketchy in the shutdown area.
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Re: New Member and need help

Postby Snowball » Wed Aug 19, 2015 10:11 am

Hi Mike sorry toke so long just got the tires in the circumference of 31 is 97.3" and the 33 is 103.6" hope this is ok to run I know you said it could be a bad thing when I slow down and I don't want to make a costly mistake and the gears are 3.50 not 3.55
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Re: New Member and need help

Postby sandaltered » Fri Aug 21, 2015 6:55 am

The ideal gear ratio for your front tires to be able to keep up would be a 3.28. So whatever is close to that. Running a 3.50 makes you about 7% underdriven. Meaning your front tires are turning 7% slower than your rears. That's not a good situation to have at all. I would recommend keeping the tire sizes the same or going to a higher gear in the front.

Without a chain drive it is easy to show here:

Basically:

97.3 / X = 103.6/3.5
So rearranging:

(97.3*3.5) / 103.6 = X

3.28 = X

Sorry for math class. But that's how I do it.
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