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Offline wegian_63

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sprocket question
« on: August 14, 2012, 09:38:42 am »
I ran in a race last weekend and i just dont think I have the right setup yet.  I have a JD STX38, 12.5hp, running 6 in on Engine, 4 in on 700, 12 sprocket on trans and 46 on axle, I had pretty good distance speed, but lacking acceleration.  Thinking of jumping to a 14 sprocket on trans? 

any help would be appreciated, thx
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Offline Burton for Certain

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Re: sprocket question
« Reply #1 on: August 14, 2012, 09:40:47 am »
That'll make acceleration worse. Go to more teeth on the axle. I.e.- 48/50.

Also, governed? Built motor?
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Offline Burwell555

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Re: sprocket question
« Reply #2 on: August 14, 2012, 09:43:02 am »
Yep, exactly what Burton said...and how long was the track you were on? I carry a 12,13, and 14 for the tranny and 44,46,48,50 for my rears and have never had to go without the right combo
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Offline foolnhismoney

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Re: sprocket question
« Reply #3 on: August 14, 2012, 09:46:05 am »
do a search for a gear chart or go on ec and use the speed calculator.
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Offline wegian_63

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Re: sprocket question
« Reply #4 on: August 14, 2012, 09:59:23 am »
stock motor, govenor removed, running aroun 4950 rpms at full throttle.  100 foot straight aways.
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Offline Burton for Certain

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Re: sprocket question
« Reply #5 on: August 14, 2012, 10:04:01 am »
Try a 50 rear sprocket.
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Offline royalblu68f100

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Re: sprocket question
« Reply #6 on: August 14, 2012, 10:15:47 am »
18 inch rear tires?
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Offline wegian_63

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Re: sprocket question
« Reply #7 on: August 14, 2012, 10:36:45 am »
yeah 18 wheels, I will be changing them soon.
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Offline Rooster

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Re: sprocket question
« Reply #8 on: August 14, 2012, 10:40:45 am »
Change those tires before you mess with gears.
It will be a whole new mowchine!
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Offline wegian_63

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Re: sprocket question
« Reply #9 on: August 14, 2012, 10:42:37 am »
what size would you recommend?
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Offline royalblu68f100

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Re: sprocket question
« Reply #10 on: August 14, 2012, 10:45:11 am »
The larger the tire, the more teeth you will have to have on the rear to pick up rpm's faster.  Is there any room for a larger front pulley? The EC speed calculator is a useful tool if you know your rpm's, pulley and gear sizes.  

I would recommend 16's or even smaller if you are allowed to.
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You never win a race by focusing on one aspect of the race!  Motor isn't everything, but you better have a good one!  Chassis too!  But remember, a driver can take a slow machine and make it faster!  I may not have/be the best of any of these but I'm trying!
Chris Cox- CP/Mod X, AP
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Offline wegian_63

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Re: sprocket question
« Reply #11 on: August 14, 2012, 01:33:19 pm »
i could maybe put a 7 in pulley on, but it would be close.

I will check out the speed calc, i actually think I have a set of 16's on my spare transaxle.  I will have to check it out tonight.
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Offline Burwell555

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Re: sprocket question
« Reply #12 on: August 15, 2012, 01:09:04 pm »
With your motor set up, a 6 inch pulley on the motor is fine in my experience...I would say like the others, go to a 16 inch rear tire on 8 inch wheels and I bet your gearing would be pretty close!
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Offline wegian_63

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Re: sprocket question
« Reply #13 on: August 15, 2012, 02:32:39 pm »
thx, I dont have any 16's at home, so it looks like I get to go shopping again!! haha

Burwell555, are you running a kohler on your JD?
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Offline GRUBDIGGER

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Re: sprocket question
« Reply #14 on: August 15, 2012, 03:56:17 pm »
Quote from: wegian_63 on August 15, 2012, 02:32:39 pm
thx, I dont have any 16's at home, so it looks like I get to go shopping again!! haha

Burwell555, are you running a kohler on your JD?

WHO KNOWS? CHANGES ALL THE TIME. :lol:
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