Nick
Posted a lot
Posts: 2,483
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Welded diffNick
@rearwheelnick
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Well sunday involved removing my standard bmw LSD... because it was rubbish. 25% lock whats that all about then??.. so now gone is25% locking 3.91:1 ratio LSD... and now in its place is a 3.46:1 WELDED DIFF... i cant describe it, its so different, i still have to get used to it, when i kicked my car out with the old LSD it gave me a lovely snappy kickout and that was my warnin to get ready to catch it, now with welded diff, there is no harsh kick out its really progressive and so i keep missing catching it, and that combined with no ability to lift off at all = me spinning a few times, only at low speed, I'm too cautious to go attempt anything high speed with welded diff until i know how to control it properly.. aside from the spins, in the dry its awesome, traction is amazing, the lower ratio means acceleration is a bit slower but i can now get comfortable past 60 in 2nd. the car feels so planted in the dry, in the wet its a bit different and a case of just treading carefully and not going too fast in the bends....not till i get used to it, get a few drift days and maybe track days under my belt with it and i'll feel much more confident with it ;D ;D ;D
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idea stolen from rattely eddie.
this weeks car count "5"
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Shortcut
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I won't be there when you cross the road, so always use the Green Cross Code.
Posts: 3,037
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Can someone explain why this works.
I'm told the Zs would benifit from an LSD as the suspension is so hard and it looses traction in tight corners as the wheel lifts (FWD). 104/Samba lsd's are ultra rare so this might be an option?
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This space available to rent. Reach literally dozens of people. Cheap rates!
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Sounds lethal…. Puts me in mind of trying to drive those diff-less 3-wheel off-road motorbikes. Will you not wear your back tyres out in record time? Surely you need a diff for that reason alone! Saying that, I’ve never tried a car with a solid diff. Plus you’ll be able to drive on two wheels like Russ Whatnot or whatever his name is (the mini-driving stunt fella)
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1972 Fiat 130 1985 Talbot Alpine 1974 Lancia Beta Saloon 1975 + 1986 Mazda 929 Koop + Wagon 1982 Fiat Argenta 2.0 iniezione elettronica 1977 Toyota Carina TA14 BEST CAR EVER!!!!!!!! 1979 Datsun B310 Sunny 4-dr 1984 Audi 200 Quattro Turbo 1983 Honda Accord 1.6 DX GONE1989 Alfa 75 2.0 TS Mr T says: TREAT YO MOTHER RIGHT!
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Quite. An e30 is already a tail-happy device in the wrong hands. Don't blame us if you crash into a tree and go on fire.
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Russ Swift!
It does sound lethal and with a front wheel drive car it would be undrivable unless you've got equal length driveshafts.
A limited slip diff was made for a reason! If it was as simple as welding them up everyone would do it in competition. I dread to think how it will handle in the wet.
I don't mean to be negative, but I'd seriously consider the safety aspects to this.
S
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Cheers S
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Surely the ackerman angle at the front end would mean that a locked diff would work fine in a FWD car?
Didn't PPC havea bit on diffs a couple of months back? The concensus that they gave was that the angle of rotational difference betwixt inside and outside wheels on a car with a locked diff was well within the operational slip angle of the tyres.
*n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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Shortcut
Posted a lot
I won't be there when you cross the road, so always use the Green Cross Code.
Posts: 3,037
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I'll leave that then!!
;D ;D ;D
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This space available to rent. Reach literally dozens of people. Cheap rates!
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The Global GT light car has a tube rear axle with a chain-drive on it....And that's faster than the Radical SR...
*n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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Surely the ackerman angle at the front end would mean that a locked diff would work fine in a FWD car? Didn't PPC havea bit on diffs a couple of months back? The concensus that they gave was that the angle of rotational difference betwixt inside and outside wheels on a car with a locked diff was well within the operational slip angle of the tyres. *n No, the ackerman angle ensures that the inner and outer wheel trace the correct inner and outer diameter of the arc you are turning in, nothing to do with differential wheel speed (which you do not need to be a scientist to see will be different for the inner and outer wheels). As for the slip angle, forcibly inducing increased ‘slippage’ between tyre and road, how does that help anything? A limited slip diff takes action when slip occurs, a locked diff is going to FORCE slip in all but the straight ahead condition, result: goodbye traction, hello ditch! (or bus shelter full of old people and schoolkids).
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1972 Fiat 130 1985 Talbot Alpine 1974 Lancia Beta Saloon 1975 + 1986 Mazda 929 Koop + Wagon 1982 Fiat Argenta 2.0 iniezione elettronica 1977 Toyota Carina TA14 BEST CAR EVER!!!!!!!! 1979 Datsun B310 Sunny 4-dr 1984 Audi 200 Quattro Turbo 1983 Honda Accord 1.6 DX GONE1989 Alfa 75 2.0 TS Mr T says: TREAT YO MOTHER RIGHT!
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Nick
Posted a lot
Posts: 2,483
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Welded diffNick
@rearwheelnick
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yeh tyre wear will be big issue, but then i run partworns, its just for drifty purposes really.
NickB yeh e30's are a bit tail happy but i figure its only as dangerous as how i drive it, and to be honest apart from the odd corner etc I'm pretty sedate in it, just save manic behaviour for drift days,
one thing is that in the dry when i pull off the tyres squeal and I'm getting funny looks, ah well.
a few of my friends from drift days use locked diffs, you just have to tread carefully as long sweeping corners in the wet induce vast amounts of understeer.
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idea stolen from rattely eddie.
this weeks car count "5"
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Haynzee
Kinda New
Keeping it strange.
Posts: 7
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long sweeping curves , such as joining a motorway, will keep you entertained to say the least. a locked diff really isnt an option for a road car in my opinion. essentially the rear wheels are just ploughing the car forwards all the time, regardless of what the front wheels are doing. mind you, its a beemer so not particularly powerful. any more than 250bhp and you'll be in a world of hurt
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Last Edit: Jun 1, 2005 19:23:18 GMT by Haynzee
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The article in PPC about diffs was very useful and answered a question I put on here about LSDs I posted on here a few weeks back.
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BS Nymph Singer Chamois Coupe Series 3 Landy
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I ran my mk1 escort for a while with a welded diff admittedly. Absolute nightmare for reversing feels terrible the noises and creaks coming from the back end as its twisting the leaf springs trying to keep the wheels in a straight line. Forwards going quickly fine because basically you knew every corner you came to you would be sideways. Forwards slow speed manouvering not good.
Run an atlas LSD now but I rebuilt it really tight and I use a synthetic non-LSD oil so its almost the same as a locked diff.
If you ran a welded diff on a front drive you would end up with brilliant straight line traction massive understeer in the wet and the front end would judder and skip on any kind of lock in the dry as it tried to keep both wheels the same speed. Russ normally only welds the diffs on a front drive when he is driving them on two wheels as its the only way to keep driving
If its purely for drifting I think a locked diff would be spot on but if you did many miles on the road I think I would keep a standard diff.
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Welded diffBenzBoy
@benzboy
Club Retro Rides Member 7
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Would it not suffer from "wind-up" like 4WD's tend to when they lock the diff? If you're doing a lot of twisty country-road driving I bet it'd be a bit.... interesting, to say the least! ;D
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racer86
Posted a lot
'72 BMW 2002 / '72 Alpine A110 Gordini
Posts: 2,184
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I was reading an artical on welded diffs and it was saying that generally the difference in rear wheel speed is about 2 to 8% on a roundabout so its not completly impractical, but like you say low speed parking ect must be fun. I d love to drive a car with a welded diff must be so much nicer to drift. now i have a couple of spare diffs for the shuv might have to experiment.
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Nick
Posted a lot
Posts: 2,483
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Welded diffNick
@rearwheelnick
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still going strong, love it. I'm not having any problems really.
and on the not powerful side, my friend runs one in his 305hp e36 m318.....its just different same with anything you get used to it and then its fine
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idea stolen from rattely eddie.
this weeks car count "5"
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with a 4wd when you lock the centre diff you still have a front and rear diff to wind up. When you lock the diff on a two wheel drive theres nothing left to wind up. With a locked diff when you ease off the throttle when going sideways they stop sliding with a locked diff they just keep on going ;D ;D
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