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Old 2007.01.21, 01:33 AM   #1
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Tuning With The Ball Differential

Last night I ssembled an old MR-02 chassis with a board I just installed the 3010 fets on to fit to a McLaren F-1 LM. I decided to use an Atomic ball differential instead of the stock differential I have been using on all of my cars. Raced it today and It handled great just as I assembled it, nice and smooth with no hopping. No hunting for the right springs or changing tires to try to improve the way it cornered. My fastest car yet. But, I could hear the differential slipping and it did seem a little slow when I punched the throttle coming out of the corners so I tightened up the differential a little. It absolutely rockets out of the corners now. (rocket is a relative term in this case considering it is a stock motor ) Anyway, It accelerates very quickly. What I did not expect is the dramatic difference that little tightening of the differential had on the handling/cornering characteristics. At slower speeds when negotiating the corners it handles almost the same. Very responsive, even borderline oversteer but at the end of a straightaway it now pushes like I had put harder tires or stiffer springs on the front end. Can anyone explain that? Do the 3010 fets deliver more torque than the 3004 fets? Sure feels like it?
These little cars never cease to amaze me with the complex interplay of various components.
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Old 2007.01.21, 12:16 PM   #2
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the 3010 fets do provide a little torque. I usually dial in a little slippage into my ball diff. it helps while turning under load. it also smooths out the throttle response coming out of corners.
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Old 2007.01.21, 01:48 PM   #3
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The way I setup my ball diff is also with just a little bit of slip. I hold the car in my hand with my fingers stopping the rear tires from moving. Then I punch the throttle. I usually like it where the motor is straining a bit to turn the diff. There should be enough slip that it still turns but it shouldn't spin at full speed.

I don't do it very long so I don't overload the FETs. I had to tighten my diff just a little when I went to 3010 fets.
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Old 2007.01.22, 01:50 AM   #4
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Thanks guys- I'll loosen it a bit next time I get to run. Just found it interesting how a little adjustment to the ball diff made such a difference in the way the car cornered under power.
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