PN Racing Mini-Z 2WD Machine Cut Delrin Limited Slip 64P Spur Gear 51T-54T

[PNracing]

New design for 2WD Ball Diff replace.
Limited Slip Spur Gear
Machine Cut Delrin
64 Pitch
Save grease V Grooves
Patent Pending number US 61/274, 308

[mk2kompressor]

thats a cool concept,when will they be available?

[PNracing]

Originally Posted by mk2kompressor

thats a cool concept,when will they be available?

Already on web site

[color01]

Looks great Philip, when do you want to send me one?

[Tjay]

It looks AWESOME!!! Yes Philip, when do you want to sent me two? haha

[chad508]

forgive my ignorance but what is the benefit of it slipping?

[mikey]

Originally Posted by chad508

forgive my ignorance but what is the benefit of it slipping?

The benefit is it won't slip when you're accelerating.

[LED]

Originally Posted by mikey

The benefit is it won't slip when you're accelerating.

I dont realy understand either. Whats the point in having a ball diff then ?

[benmlee]

This is basically a one way limited slip differential. You get a slight traction increase during acceleration when balls engage the wedge. But balls in the diff are free to rotate when braking or when no throttle is applied.

[Davey G]

Lets see if I can spread some knowledge on this new product. On the starting line and when exiting a turn the balls will be forced into the v pocket and jammed up, this will in essence turn into a spool (LOCKED DIFF). This will provide straighter launches exiting the turn. But when off power the balls will center inside the pocket and return to a normal diff. Does this make sense??? Hope I was of some help to you.

[chad508]

how will it effect coming out the corner? will it try to jerk the car back straight, would it be more prone to traction rolls out of a turn if you get into the gas to soon.

[arch2b]

the design is intriguing to say the least. i am however skeptical that at this scale, weight is actually works as intended and/or as precisely as intended.

i am very likely wrong as pn puts a lot of effort into their product design but i remain skeptical until i actually get to see this work as described. it does sound cool though i'm sure someone in DC will get one and i'll have to ask to get a crack at it for sure.

kudos to pn for putting out another leap forward in mini-z tech.

[ianc]

On the starting line and when exiting a turn the balls will be forced into the v pocket and jammed up, this will in essence turn into a spool (LOCKED DIFF). This will provide straighter launches exiting the turn.

I'm not seeing it. Isn't when transiting (and exiting) a corner precisely when you want a smooth diff action rather than for it to be locked up?

But when off power the balls will center inside the pocket and return to a normal diff.

Having smooth diff action on the straight is useless since there is no relative rotational motion between the drive wheels then anyway.

Seems to me (without having tested it) that it would just give you a boatload of understeer. Willing to listen though...

ianc

[yasuji]

Originally Posted by ianc

I'm not seeing it. Isn't when transiting (and exiting) a corner precisely when you want a smooth diff action rather than for it to be locked up?



Having smooth diff action on the straight is useless since there is no relative rotational motion between the drive wheels then anyway.

Seems to me (without having tested it) that it would just give you a boatload of understeer. Willing to listen though...

ianc

ok having testsd this my self on my mod pan this is my take on it
having a locking diff equates to more on throttle steering as well as better acleration
try and increase the tention on ur std diff gear it will try to spin the rear tires
and if u loosen it up it will hook up due to better traction
with this gear i felt that it made my car drive out of the corner tighter and quicker while still being the same car every where else
the other thing i like is that i can ad extra grease to prolong the consistancy of the diff rather than it changing after every run loosing its grease
also the width of the gear prolong the life of the pinion giving it a wider contact patch
a narrow contact patch cuts in to the pinion like a knife causing excess slop-more noise and increased frictional losses
this is an A++inovation from PNRacing

[color01]

Originally Posted by ianc

I'm not seeing it. Isn't when transiting (and exiting) a corner precisely when you want a smooth diff action rather than for it to be locked up?

Not strictly. Mini-Z's tend to bounce along the RCP, so there are always momentary losses of traction where you're slipping the diff and not applying 100% of your power to the ground. By tightening up the diff, you'll be getting more of it to the ground under acceleration. So the net benefit is that you'll power out of the corner more quickly.

Having smooth diff action on the straight is useless since there is no relative rotational motion between the drive wheels then anyway.

It's not about the straight, it's about the high-speed sweepers on most tracks that more often than not tighten up into the infield section. By allowing the diff to free up again under low throttle load, the car can take the sweepers at full speed, no need to deal with the understeer caused by a tighter diff. You want the diff to be as loose as possible in this section of the track, or you'll scrubbing speed before you even get to the part where you need to slow down.

Hope that helps a bit?