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Old 10-09-2009, 07:49 PM   #1
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Default OFNA Super Torsen c/diff vs. stock

Whats the difference between the OFNA and my stock kyosho mp7.5 center diff? What advantages will i have it if i go with the OFNA? Stonger? lockable?
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Old 10-09-2009, 07:57 PM   #2
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Doubt it would fit for starters.......Manufactures make stuff to fit their vehicles only in the drive train areas.
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Old 10-09-2009, 08:02 PM   #3
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if you look at amain hobbies it's under kyosho mp7.5 parts, they say it will fit the mp7.5 and the mp777...they also have the front and rear diffs...
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Old 10-12-2009, 12:04 AM   #4
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The following is based on your Kyosho having a traditional "open" center diff.

The Ofna Torsen is a progressive-rate locking torsen (torque-sensing) diff. It works similar to the Losi Smart diffs in terms of it's action; but they take 2-different paths to perform the same job.

Basically the Ofna torsen has spiral cut gears and as torque is applied they 'ramp' causing the diff to lock under power.

If the track is open (or tight) relatively smooth and doesn't have any "rhythm" sections (or rumble strips) that will make the car buck front to rear; then it will work ok.

Best used on loose track surfaces since it keeps the power from bleeding off to the front end.

I liked to run mine with a gear-lube in it instead of silicone; made off power turning great and let it lock more progressive for me.

Main benefit is better acceleration on loose track surfaces and more on power steering.

My advice is this is an option that is best left alone until you're VERY happy with your standard chassis/diff setup. It takes a slightly different driving style to really get the most out of it.

Never run a rear torsen.

Front torsens can be used, but only on large/smooth tracks. I've run them front and center before; car has AWESOME on-power steering, but ruts and off power steering can present slight issues.
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Old 10-12-2009, 07:38 AM   #5
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ok, thanks for the advice, i will be sticking with my stock setup
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