Losi SmartDiff for 8B and 8T

[Chilly Duncan]

New from Losi (http://www.losi.com):

83896

83897

Losi engineers have designed a patent pending differential that knows exactly how to respond to track conditions and throttle input. Losi's innovative custom SmartDiff design adjusts the amount of lock based on throttle position for optimum power transfer into and out of corners. The results are improved maneuverability, increased off-power steering and outstanding acceleration.

The SmartDiff makes an easy, drop-in hop-up for every 8IGHT Buggy vehicle. The SmartDiff replaces the stock front diff on the 8IGHT without any additional modification required. Losi’s SmartDiff is fully assembled and ready for immediate installation.

Features:


Torque-Sensing Design - SmartDiff adjusts automatically based on applied power
Lightweight Spur Gears and Outdrives for greater acceleration
Fully assembled for a direct fit into stock diff locations


LOSA3600 - Front SmartDiff: 8B 2.0 - $89.99

LOSA3601 - Center SmartDiff: 8B 2.0 - $89.99

LOSA3602 - Front Smart Diff: 8-T - $89.99

LOSA3603 - Center SmartDiff: 8-T - $89.99

83898

Gear & Shaft Set: SmartDiff
LOSA3604 - $28.49

83899

Ramp Plate, 90 degree: SmartDiff
LOSA3605 - $19.99

[Racer Rob]

interesting

[guver]

I see some fiction on the hubs of the spider gears and some springs for tension. I do not se any angles,ramp, ect. for tourque sensing.

Someone please explain how it will tighten as torque is increased.

[davec-nitro-rs4]

It looks like the cross pins for the spider gears ride in ramped recesses that might cause locked-diff operation under heaviest loads? Not sure.

Is this anything new over the Fioroni design diff?

[xxxfactor1987]

I see some fiction on the hubs of the spider gears and some springs for tension. I do not se any angles,ramp, ect. for tourque sensing.

Someone please explain how it will tighten as torque is increased.

There is probably some room on the crosspins for the spider gears to slide in and out. The springs are used to keep them close to the center. When the diff spins at a low rpm it should act like a normal diff. At a higher rpm those spider gears will spead out (due to centrifugal force) untill they rub against the crosspins retainers thingies. The friction developed will probably then limit the diff action. Anyway, just my crazy theory.:huh:

[guver]

Definately 2 different theories , I can see that they both may work. Better than my lack of theory ,lol.

[davec-nitro-rs4]

Losi’s SmartDiff offers off-throttle and on-throttle action. When entering a corner and letting off the throttle, the SmartDiff automatically opens, allowing the gears to rotate freely for improved off-power steering when entering turns. When power is applied, the SmartDiff’s adjustable ramp plates lock on to the gear shafts for increased acceleration out of corners.

http://www.losi.com/ProdInfo/Files/SmartDiff.PDF

[xxxfactor1987]

ok that works much better :)

[rccardude04]

If that actually works, it'd be pretty cool actually. Kyosho tried something similar, and I think they called it the TCD. I have one in my MP777 and it's a little inconsistent it seems like.

This one looks like it might actually work and be consistent. We'll have to see. :D

-Eric

[guver]

I think I see the ramps and how it works now after looking at the pdf. Thanks, Davec.

[rezenclowd3]

Fiorioni (sp?) and Xray have the similiar designs. Davec is right, it gives different on and off throttle characteristics. With this design, the diff oil thickness is only used to tune the off power characteristic.

Xrays testing showed that for smooth tracks this works fine, but causes inconsistencies on bumpy tracks. Either way, test it for yourself and see if it improves your lap times.