It's basically quite similar to a torsen diff, but it has a more consistent action as far as I'm aware of... And it's the best upgrade ever for any Ovlov(Volvo) 240 owner:)

B-fast : http://www.bfastrc.com/

Ain't got the 22 yet, It's due to be released on March 25th. But I love my CR, and I got it working extremely well, so no stress:)

Thx! I've checked it out now... but I can't really see anything new here. All they do is sand the diff rings flat for you (which we've already done ourselves for years). Good for those who wouldn't bother doing it themselves though!

I think the fact that they flattened them with machines is better than our way with sandingpaper...

We rough them, but we can't tell if they're truly flat.

That is true. B-Fast uses machine tools to resurface the rings to a flatter state before doing the two step hand finishing/flattening steps.


.

Ah, brilliant, you're here:)

I assume this flattening process is done to both sides of the ring, of course?

Agreed, I forgot to type that. I'll give them a try of course! :thumbsup:

Yes, both sides of the diff rings are processed.

http://www.fioroni.com/inglese/prodo...ngua=ita&pag=2

Looks like those "tractive" diffs are used front, center and rear for 1:8...

Considering how much weight we re-add to our cars with LiPo, fitting diffs like this wouldn't be a problem weight wise at least...

Oh! And I remember reading about THE car and some very small diffs... are they std. diffs?

I didn't know proper clutch type LSD's were made.

C'mon Schumacher, Durango, whoever.. make some of these for 10th

Going back to the Eaton Truetrac diff...

It's not for us. This is from their instruction manual "Note: TrueTrac differentials require a certain amount of resistance at the ground in order to start the power transfer. A TrueTrac differential may not transfer power if the spinning wheel is off the
ground. If spinning occurs, often a light application of the brakes, while carefully applying power, will slow the spinning wheel enough to allow the TrueTrac differential to transfer torque to the other wheel."

Although it's open until one wheel spins, if that wheel lifts or spins too much, it goes open again.

Torsen diffs are a better option, but the amount of work needed to tune the helical angles of the gears to get the performance we need is probably a cost beyond the reach of most manufacturers. Love it or hate it, a friction or fluid clutch is probably the best-cost option to see if an LSD is a performance enhancer or not compared to the beloved ball diff.

http://www.ymr.no/bilder/Lars&SHY/1N.../BRUK/diff.jpg

...my lazyness + rain races...

-I guess one of the advantages of an oil filled gear diff is no rust! :lol:

I dont wheter to laugh at this!!!

I have used ball diffs and geared etc etc.
the simple rule is a good quality car should have good diffs. ball or otherwise. You need to know how to first build and run in and maintain.
If you ask about benifits of different diff type i think its purely to fit in the car design to get best weight and power transfer.
But an oil filled diff will have problems if you get water into the gearbox and bearings just like your picture.



BTW I thought Cecil Schu was the first to transfer bevel diff into model cars??

Nono! He invented the ball diff!

http://www.racing-cars.com/images/sc...ogo_cougar.jpg

The top left Schuey logo depicts the principle of the ball diff I've heard.

I hope you understand that the last post was a joke :D

Cecil did indeed invent the ball diff, and that was the first product of Schumacher Racing. They were made during the week in the evenings, bagged and shipped off the kitchen table at weekends!

I did an article about Cecil for Model Cars many years ago, and spent a wonderful afternoon at his house hearing about his life and times. He is a remarkable man, and one of the great pioneers of RC. If we ever got to have an RC Hall of Fame, he would be in my top three nominations as an inaugural member.

Maybe if Cecil could be persuaded out of retirement, this problem would get solved a bit quicker!

Could you please scan and email me that article? I'd love to put it into my Model Car History web page! www.ymr.no/historie.htm

that diff looks like a quaife automatic torque biasing diff (the one found on the focus RS)

Fioroni made a 1/8 buggy version of the quaife ATB diff called the Storm traction diff. A series of worm gears that mounted together inline with the drive/outputs

Before the Storm traction fioroni had the Hyper traction torsen style diff and the original (older) Japan traction torsen diff

main difference between Hyper and Japan was the Hyper had 3 pairs of worm gears perpendicular to the inner gears and the Japan had only 2 pairs.

The Storm diff was available with different worm gear sets which had more or less angle on them to change the aggressiveness of the action.

Shy, sorry but I don't have anything to scan with, and I don't hold the copyright. I suggest that you write to Alan Harman at RC Car Racer magazine and see if he knows who holds the copyright. HTH :)

i think we get most of the diffs mentioned here for our 1/5th scale cars, from self locking to manual blocking using plates etc

we also get this: http://www.rctek.com/phpBB/viewtopic.php?t=5614

http://www.rctek.com/technical/oddie...ferential.html


magnetic diff thats self ajusting to always give the best drive and traction in any condition, from people that have them they say its a huge improvment over the stock alloy gear diffs

http://www.rctek.com/technical/image...g_diff_126.jpg

Magnetic!!! Funky shit!!! And it works?!!!

How cool is that! :thumbsup:

Looks hardcore Mad Scientist!!! :D

Now this is interesting:thumbsup::thumbsup: