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Benefits of a front spool?

Benefits of a front spool?

Old 11-15-2015, 12:46 AM
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Default Benefits of a front spool?

I bought a Tamiya TB-04R kit, which comes with a rear diff and a front spool. (the oil in the rear diff seems really thin, 1000wt or less, which is odd but maybe I don't know what I'm doing.) What is the advantage of having a spool in the front instead of a diff with thick oil in it? Wouldn't the front spool just wear-out the front tires faster and make the vehicle understeer a lot? Are there benefits that outweigh those problems?
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Old 11-15-2015, 12:54 AM
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Originally Posted by fyrstormer View Post
I bought a Tamiya TB-04R kit, which comes with a rear diff and a front spool. (the oil in the rear diff seems really thin, 1000wt or less, which is odd but maybe I don't know what I'm doing.) What is the advantage of having a spool in the front instead of a diff with thick oil in it? Wouldn't the front spool just wear-out the front tires faster and make the vehicle understeer a lot? Are there benefits that outweigh those problems?
That is a question I wanted to ask way back. I run gear diffs with 1 million wt diff and 2.5 million wt diff oils. I feel that there should be somehow some kind of diff action in front. But that's only me. I do not have that level of expertise the others have.
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Old 11-15-2015, 02:11 AM
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Yes the spool does wear front tyres and driveshafts more. And it gives you understeer into the corner.

But it gives way more forward drive out of the corner, which usually makes up for those downsides. I say 'usually' as you do sometimes see the top guys running a diff up front, but not very often.
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Old 11-15-2015, 02:28 AM
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Originally Posted by SagadSetup View Post
That is a question I wanted to ask way back. I run gear diffs with 1 million wt diff and 2.5 million wt diff oils. I feel that there should be somehow some kind of diff action in front. But that's only me. I do not have that level of expertise the others have.
Do what works for your driving style. I'm currently running 100K in my front diff for 17.5 TC, and it handles great for me. Every time I try a spool or very thick oil, the results are really ugly.

I run thin oil in the front diff of my VTA, so it doesn't scrub speed through a sweeper. (With a VTA, almost ALL corners are sweepers!) Going thicker on the oil doesn't help my VTA pull out of a corner faster, since there's not enough horsepower for the inside front wheel to spin.
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Old 11-15-2015, 02:39 AM
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What's a VTA?
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Old 11-15-2015, 02:55 AM
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Originally Posted by howardcano View Post
Do what works for your driving style. I'm currently running 100K in my front diff for 17.5 TC, and it handles great for me. Every time I try a spool or very thick oil, the results are really ugly.

I run thin oil in the front diff of my VTA, so it doesn't scrub speed through a sweeper. (With a VTA, almost ALL corners are sweepers!) Going thicker on the oil doesn't help my VTA pull out of a corner faster, since there's not enough horsepower for the inside front wheel to spin.
Thanks. It's just right to configure you chassis to your driving style.

@frystormer

VTA = Vintage Trans-Am R/C
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