Ok, what's one of them?

[TWINSET]

Keep seeing a lot of cars with one way diffs - what do they do, and what's the benefit?

I haven't got much else to do today[]

[fury_dice(2)]

As I understand it it's like the free-wheel hub on a bike; drives one way, then 'freewheels' when the powers off. They seem to be a favourite of the touring car racers - they can probably chime in with how the handling is affected by having one.

Fancy doing some Oracle programming if you're 'quiet' - I've got a mountain of scripts to write [V]

[mud4fun]

Not heard of one way diffs but can't see they'd make much difference to the handling of an SRB....

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fury_dice - your not the only one stuck doing ORACLE stuff at the moment, currently sat trying to write some reports for a customer to analyse work done thru his system...only a few million records to sift thru []

[BalmyBaldwin]

Got one in my avante. It basically allows the front wheels to run faster than the rear. This helps because when turning your front wheels travel further (and therefore faster) than the rear. In terms of handelling, it allows better turn-in and higher speed cornering. As always there is a downside - your brakes/reverse only drive the back wheels (so you spin out if you put brakes on too hard.)

Hope this helps!

[fury_dice(2)]

quote:Originally posted by mud4fun

fury_dice - your not the only one stuck doing ORACLE stuff at the moment, currently sat trying to write some reports for a customer to analyse work done thru his system...only a few million records to sift thru []

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Just the few million - chicken feed []

Sounds like you've got your work cut out buddy - you have my condolences. Who do you work for then? (just curious - mail if you don't want to broadcast it)

[DJTheo]

quote:Not heard of one way diffs but can't see they'd make much difference to the handling of an SRB....

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Yes, it would make it not brake or go reverse at all, very bad for handling on a 2wd or if used on both axles on a 4wd []

[TWINSET]

S'ok, wasn't for SRB, just keep reading about cars with 'em fitted, and wondered what they did.

[wriggleandgiggle]

They act like a half ar$ed centre diff, with the added benefit of 'rear wheel only' braking.. Not much of a benefit.

You can get them for XC chassis and I bought one, it turns a capable off roader into a wheel spinning mess. Lock every diff you have - lol

[Martin71RS(2)]

or use 2 onewaydiffs.....

[]

Martin

[mud4fun]

Fury_Dice, I work for a small company called OASIS Global Systems based in Hemel Hempstead although I actually work from home in North Lincs. We write e-commerce solutions for the automotive industry, on line authorisation of work, invoicing, dealer and fleet management systems. The project I've been on for the last few years involves big UK leasing companies like HSBC vehicle finance etc. We currently use J2EE over ORACLE (805 and 817) but we have just been taken over by another company Epyx and all future development will be in their native platform of .NET over SQL Server - I prefer ORACLE myself despite the fact that nothing in the GUI works and you end up using command line....(I'm convinced it was written by same guy that wrote the 'vi' editor in unix - some hippie on drugs at the time?!*)

[mud4fun]

BTW IMHO the best diff for off road use is one that can be locked up on the move (ARB Air lockers etc in 1:1) or failing that no diff at all. Now just imagine a Gecko chassis'd Clodbuster with air locking diffs!

[fury_dice(2)]

heavy duty stuff M4F! Never got into the java stuff - much more concerned with the database itself. Currently responsible for the data warehouse behind the national book charts (the stuff you see in the newspapers on a Saturday) running on Oracle 9iR2. Better stop before we put all the other TC'ers to sleep []

[mud4fun]

[] how true....didn't even train in IT, was a mechanical engineer and eventually worked my way up from shop floor to CNC programmer. Once there realised that I could earn double the wages programming in a tinted glass office building for 37.5hrs than working in a noisy, smelly, dirty factory for 70hrs a week!!! [] sadly, 10 years on I find I REALLY miss the dirty, smelly shop floor - great bunch of people, very down to earth unlike many of the young kiddies I have to work with now.[]

[gecko no more]

quote:Now just imagine a Gecko chassis'd Clodbuster with air locking diffs

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heaven!! I've locked both diffs on mine and its pretty much unstoppable, but when I try to corner at high( well relatively ,for a truck this size)speed it tries to roll at the slightest provocation. many a time i've had it on two wheels, monster jam style. if only it had remote lockers.........

[DJTheo]

quote:BTW IMHO the best diff for off road use is one that can be locked up on the move (ARB Air lockers etc in 1:1) or failing that no diff at all. Now just imagine a Gecko chassis'd Clodbuster with air locking diffs!

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Yes, or even better a torsen diff which tranfers the most torque to the wheel with the highest traction opposite to a normal diff, think even some RC cars existed with it! [8D]

[mud4fun]

oooohhh, I want one! well, quite a few actually....will trawl the net...

[gecko no more]

check this out!!!

http://www.rc-truck.com/fabry_diff.html

this might help.

http://babelfish.altavista.com/

[mud4fun]

Gecko, that is pretty much perfect, now wonder if we can get it to fit a Clod axle? [][8D]

[Twmaster]

quote:Originally posted by mud4fun

Now just imagine a Gecko chassis'd Clodbuster with air locking diffs!

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<drool>

[gecko no more]

started trying already. will let you know how it goes(or not), Ive.just got to pluck up the courage to 'section' one of my brand new gear cases .[] hopefully it will be eorth it tho'

[terry.sc]

quote:

Yes, or even better a torsen diff which tranfers the most torque to the wheel with the highest traction opposite to a normal diff, think even some RC cars existed with it! [8D]

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Torsen diffs are available for most racing 1/8th buggies

If you need to ask the price you can't afford them!

[terry.sc]

quote:Originally posted by TWINSET

Keep seeing a lot of cars with one way diffs - what do they do, and what's the benefit?

I haven't got much else to do today[]

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The one way diff gives better turn in to tight corners, and lets the car roll through high speed corners faster. Coming out of corners the one way locks up and pulls the car out of the bend for better acceleration. The big problem is that only the rear wheels are used for braking, which means that braking can be a bit hit or miss if the car is not properly set up, and it will swap ends if you brake too hard. Without a one way the car is a lot more stable through corners, and if you brake too hard the car will go straight on.

Personally I almost always run with a one way on all high grip tracks, but without a one way on low grip tracks.

[RETRO R/C]

I would like to clear something up. The industry "LAZILY" calls these items we are talking about one way "DIFFS" - they are in fact NOT differentials at all. They are a solid drive gear with a one way bearing. There is no differential action at all.

There are advantages for using the one way system if the grip is high as already mentioned. What has not been mentioned is that set up can be more critical.

In lower grip situations the one way makes the front of the car "understeery" (particularly out of corners), because of the lack of differential action. This type of situation requires both a differential and a one way - on the layshaft - giving you the best of both worlds.

I have probably opened a can of worms for some less experienced racers - however those with more experience will know what I mean...please feel free to ask more questions - we all learn from eachother !

Cheers

Darryn

[terry.sc]

quote:Originally posted by RETRO R/C

In lower grip situations the one way makes the front of the car "understeery" (particularly out of corners), because of the lack of differential action. This type of situation requires both a differential and a one way - on the layshaft - giving you the best of both worlds.

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The one way I use is on the layshaft, so I still use front and rear diffs in the car. And there are subtle differences in the handling using a one way on the layshaft compared to replacing the front diff with a one way, or even using both together. The experienced racers use these combinations to tune the handling. It is also quite common for race meetings eg the Reedy races, to ban one ways as they make overtaking other cars under braking a bit hit and miss (literally![])

Interestingly the original Kyosho Lazer ZX had a centre differential with a one way fitted so you only had the differential working in one direction, and a secondadjustable one way on the layshaft for the drive to the front. A bit over engineered as later models just had a normal slipper clutch.

[RETRO R/C]

Exactly ! []

Cheers

Darryn