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Old 11-20-2007, 12:46 PM
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Originally Posted by IslandBwoy View Post
That was the plan, but now that i hear daytona has a race, that sounds a lot more echonomical. I'll just have to see.
daytona? isn't that on sunday? come on saturday and race in the a/c!
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Old 11-20-2007, 01:20 PM
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Adam, I just PM'd you an order for a few things. For some reason my Email wouldn't go through. You may get it later. Just ignore the Email.
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Old 11-20-2007, 02:29 PM
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Hey all quick update that a lot of people have been ewaiting to hear...




(U2741) 1 degree alloy rear hub carriers are back in stock!
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Old 11-20-2007, 02:57 PM
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Originally Posted by abailey21 View Post
Hey all quick update that a lot of people have been ewaiting to hear...




(U2741) 1 degree alloy rear hub carriers are back in stock!
That is a long waiting item....need to order 1.
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Old 11-20-2007, 03:02 PM
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Originally Posted by adamliehr View Post
Hey guys, I got a question about diff balls. In our diffs on the mi3 we use balls that are a lot smaller than the ones used in 12th scale cars and oval cars. I was just wondering if there was a reason for this and if anyone tried using bigger balls? Would there be an advantage?

Im guessing that if we just added the bigger balls to our diffs they wouldn't build right, but if the diff was designed for them; could there be any difference? Doubtfull, but still curious about it.

So, answer me this...

Who's got big balls?!
How about 2.4mm Balls instead of 2.5mm ones??? I've got some 2.4mm ones from my yokomo days
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Old 11-20-2007, 04:21 PM
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Originally Posted by adamliehr View Post
Hey guys, I got a question about diff balls. In our diffs on the mi3 we use balls that are a lot smaller than the ones used in 12th scale cars and oval cars. I was just wondering if there was a reason for this and if anyone tried using bigger balls? Would there be an advantage?

Im guessing that if we just added the bigger balls to our diffs they wouldn't build right, but if the diff was designed for them; could there be any difference? Doubtfull, but still curious about it.

So, answer me this...

Who's got big balls?!
Back in the day...the SST series sedans had 4mm diff balls...thats really big. In testing Schumacher R&D found that smaller diff balls gave a diff more limited slip action. This means is you ever lift a rear wheel smaller diff balls send more power to the wheel on the ground than big diff balls. Thats a good thing.

Schumacher ended up going with the smallest balls they could easily source in Europe...2.5mm.

3/32" (2.4mm) balls from associated will not fit. The width of the center of our diff pulley is designed to let a little of a 2.5mm ball peek out either side. With a 2.4mm ball the diff rings will be too close to the center of the diff pulley and that messes everything up.

That said there is no reason to run anything over than U2459 T/C diff balls. They are THE BEST. Over the last 6 years that I worked at Schumacher we tried every kind of diff ball from every place you can imagine and nothing worked as well as out tungsten carbide 2.5mm balls.

I think ceramics have a lower coefficient of friction against the steel rings than tungsten balls. As a result ceramics tend to slip easier and this chews up diff rings faster.
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Old 11-20-2007, 04:23 PM
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Roll Call who going to MINNREG this weekend I'm in for 10.5 rubber
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Old 11-20-2007, 05:02 PM
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Originally Posted by AdrianM View Post
Back in the day...the SST series sedans had 4mm diff balls...thats really big. In testing Schumacher R&D found that smaller diff balls gave a diff more limited slip action. This means is you ever lift a rear wheel smaller diff balls send more power to the wheel on the ground than big diff balls. Thats a good thing.

Schumacher ended up going with the smallest balls they could easily source in Europe...2.5mm.

3/32" (2.4mm) balls from associated will not fit. The width of the center of our diff pulley is designed to let a little of a 2.5mm ball peek out either side. With a 2.4mm ball the diff rings will be too close to the center of the diff pulley and that messes everything up.

That said there is no reason to run anything over than U2459 T/C diff balls. They are THE BEST. Over the last 6 years that I worked at Schumacher we tried every kind of diff ball from every place you can imagine and nothing worked as well as out tungsten carbide 2.5mm balls.

I think ceramics have a lower coefficient of friction against the steel rings than tungsten balls. As a result ceramics tend to slip easier and this chews up diff rings faster.


Cool.... thanks!
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Old 11-20-2007, 05:30 PM
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Thanx Adrian
I've just checked p-dub website and There is nothing on sale so where you guys bought your p-dub bumpers
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Old 11-20-2007, 05:48 PM
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Originally Posted by AdrianM View Post
That said there is no reason to run anything over than U2459 T/C diff balls. They are THE BEST. Over the last 6 years that I worked at Schumacher we tried every kind of diff ball from every place you can imagine and nothing worked as well as out tungsten carbide 2.5mm balls.
Adrian/Adam/Shawn- about #U2459- are these the tungsten carbide 2.5mm diff balls Adrian recommends?
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Old 11-20-2007, 06:02 PM
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U2459 are the 2.5 Tungsten Carbide

Originally Posted by yyhayyim View Post
Adrian/Adam/Shawn- about #U2459- are these the tungsten carbide 2.5mm diff balls Adrian recommends?
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Old 11-20-2007, 06:14 PM
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Me...or tell your LHS to call it in

Originally Posted by yokemad View Post
Thanx Adrian
I've just checked p-dub website and There is nothing on sale so where you guys bought your p-dub bumpers
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Old 11-20-2007, 06:30 PM
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@Adam
You've got PM mate
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Old 11-20-2007, 07:08 PM
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Originally Posted by AdrianM View Post
Back in the day...the SST series sedans had 4mm diff balls...thats really big. In testing Schumacher R&D found that smaller diff balls gave a diff more limited slip action. This means is you ever lift a rear wheel smaller diff balls send more power to the wheel on the ground than big diff balls. Thats a good thing.

Schumacher ended up going with the smallest balls they could easily source in Europe...2.5mm.

3/32" (2.4mm) balls from associated will not fit. The width of the center of our diff pulley is designed to let a little of a 2.5mm ball peek out either side. With a 2.4mm ball the diff rings will be too close to the center of the diff pulley and that messes everything up.

That said there is no reason to run anything over than U2459 T/C diff balls. They are THE BEST. Over the last 6 years that I worked at Schumacher we tried every kind of diff ball from every place you can imagine and nothing worked as well as out tungsten carbide 2.5mm balls.

I think ceramics have a lower coefficient of friction against the steel rings than tungsten balls. As a result ceramics tend to slip easier and this chews up diff rings faster.
I have been playing with a stereoscope lately and have been comparing the rings and balls and such from running ceramic and tungsten balls. I have found the ceramics to chip easier than the tungsten. I drive so-so and only seem to get a few runs out of the ceramics before they chip on me leaving the diff with notchy flat spots that come and go when you check the diff by hand turning the wheel. I swapped over to the tungstens and the diff stays smooth and perfect for quite a while. In fact I have been running the same diff since I rebuilt it without any probs. Honestly I have come to the same conclusion as what adrian posted about building a diff earlier. Just resand the rings with 600 grit, use the tungsten balls and non indexed rings with the upgraded thrust bearing and you've got a perfect diff that doesn't require any replacement of parts for rebuilds.
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Old 11-20-2007, 10:05 PM
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Originally Posted by dawgmeat View Post
Roll Call who going to MINNREG this weekend I'm in for 10.5 rubber
me
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