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| Limited Slip Diff https://ausmini.com/forums/viewtopic.php?f=5&t=6735 |
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| Author: | MrBob [ Thu Apr 28, 2005 11:52 pm ] |
| Post subject: | Limited Slip Diff |
I wanna know everything. Who can help me?? I have a potential LSD (not the drug!!  ) lined up for $500, but know nothing at all about them. The guy told me it was made by a guy in Qld, and it looks pretty neat. If I got some photos, would it be possible for someone on here to identify what type it is and whether it's worth investigating further??
Thanks Guys. |
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| Author: | drmini in aust [ Fri Apr 29, 2005 7:11 am ] |
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These are made from a standard diff centre, by Fred Sayers in Brisbane. PM justminis, he had one and recently sold it to Ozmotorsport, might be worth asking Oz too. 
<edit> Oz is/was using his on the road, it's a 1380 with a 3.76 diff.. 
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| Author: | TK [ Fri Apr 29, 2005 7:20 am ] |
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The good doctor is right. Made by Fred Sayers. They are a cone LSD made out of standard diff. They work on the same principle as the Phantom LSD. I know of a guy using them for the street but I reckon there only good for the track. Fred will make one up for you for about $450 if you supply your own standard diff. |
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| Author: | drmini in aust [ Fri Apr 29, 2005 8:28 am ] |
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TK, do these things fill the oil with shavings? Someone on MM reckoned having a Phantom Grip LSD was like having a lathe in your gearbox... 
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| Author: | Boostedmini [ Fri Apr 29, 2005 9:20 am ] |
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oooh not good to have a lathe in your gearbox, i was only thinking the other day how Oz's LSD is going? but he does not seem to post much any more. |
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| Author: | TK [ Fri Apr 29, 2005 12:52 pm ] |
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I hope not Kev. I spent too much money on this engine. Fred has been using these for a very long time without any problems, in street and race engines. My guess is that if there was any problems it would have been discovered. It's similar to the phantom but different in design it doesn't use plates. |
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| Author: | 68matic [ Fri Apr 29, 2005 1:04 pm ] |
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whats the diff between a normal diff and an LSDiff? looking at the name, 'limited slip', i would say its a differential that doesnt slip. but all diffs couple the gearbox to the driveshafts, and they shouldnt slip at all. so that could be nonsense. i know that when normal gear teeth contact, there initially is slip between the teeth surfaces, then a point of rotation, then slip as they part. and i also learnt of a gear coupling using circloid shaped teeth, not the average teeth that use pure rotation between teeth, and no slip. are my assumptions along the lines of what an LSD is, or am i just hullicinating again? |
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| Author: | fuzzy-hair-man [ Fri Apr 29, 2005 1:46 pm ] |
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A LSD is a thing to control traction. normally as you go round a corner the outside wheel is required to move faster than the inside wheel. If you had a solid diff this would not happen and the car would try to go straight ahead and you would litterally have to drag it around the corner. As a result a diff lets the power be shared between the two wheels whilst still allowing the outside whell when cornering to move faster. All this is fine until you encounter a loss of traction, in this case the normal diff will transfer all power to the wheel that is slipping and none to the wheel that has maintained grip. This is bad news particularly if you are a 4wd you just sit there spinning your wheels uselessly. So a limited slip diff is used to provide some amount of difference in wheel speeds but it will then transfer power to the wheel that maintains traction. The reason this is useful in racing is going round corners on two wheels means the inside wheel has no traction  OK this doesn't happen all the time but it does mean that the inside wheel is more inclined to slip. the LSD prevents all power going to that wheel and hence a loss of forward momentum.
The phantom LSD works by packing the middle of the diff with two plates seperated by some pretty hefty springs which force the plates against the cogs(for want of knowing the correct term) at either end of the diff this provides a resistance to the two wheels moving at different speeds. There are also different types of LSD Viscous couplings Clutch pack types The one they use in the Hummer (Torsen?) and some more as well Apparently the Skyline one is quite innovative it allowed the car to behave like a rear wheel drive (oversteer tendencies) but when the LSD cut it it let you have the traction to drive out of the corner. Now with traction control a computer monitors the speed of each wheel and if a wheel is more than some tolerance faster than the rest the computer applies braking force to that wheel which distributes the power to the other wheels. Oh Apparently the early racing minis used a solid diff so that gave them more traction but they really had to man handle the cars around the track. Minis being lighter than most cars this wasn't the problem it would have been with a heavier car. The following link can explain it far better than me though http://auto.howstuffworks.com/differential.htm
Will a LSD help to control torque steer  I would have though it would go towards helping
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| Author: | 68matic [ Fri Apr 29, 2005 7:52 pm ] |
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Thanks, man, with fuzzy hair. very informatve
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| Author: | drmini in aust [ Fri Apr 29, 2005 7:54 pm ] |
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If you use an LSD for road use you would not want the slip torque set too high, or it will tend to understeer like a pig and go ahead on corners. Ask kazjim, he found this out...
Race ones need to be driven hard to overcome this. |
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| Author: | kazjim [ Fri Apr 29, 2005 8:02 pm ] |
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Yea yea.. as you keep reminding me .... Here's the scene .... Wakefield park... Good day, Mini running great.... Chris (Oz) has his Supermini Race car there (Ex John Wakefield) "She'll be right Jim, have a go, you'll be fine" me - "you sure ? - well ok, but its my first time" "Yea, it'll be gentle.. just remember to power through the turns...." me .... vroom, vroom, brake, turn, crap.. no turn.... ferk, grass infield.... *CRACK* (Insert sound of front spoiler breaking on contact with nice soft goulburn soil. . . . ) "umm Chris? - I broke your car dude...." "no probs Jim, Saved me doing it" .... Top guy.. Guess I wont be using a LSD on the street. . . . . . 
J PS - there is a vid floating around somewhere of it ...... Chris ? |
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| Author: | TK [ Fri Apr 29, 2005 8:43 pm ] |
| Post subject: | |
Yes don't back off or you'll lose it. Just keep the pedal to the metal with a LSD |
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| Author: | 9YaTaH [ Fri Apr 29, 2005 9:48 pm ] |
| Post subject: | Re: Limited Slip Diff |
MrBob wrote: I wanna know everything.
Who can help me?? I have a potential LSD (not the drug!! ) lined up for $500, but know nothing at all about them. The guy told me it was made by a guy in Qld, and it looks pretty neat. If I got some photos, would it be possible for someone on here to identify what type it is and whether it's worth investigating further??Thanks Guys. Bob, go and have a chat to Greig Malaure...most of the top racers use an LSD these days AFAIK.....he should be able to advise you...
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| Author: | TK [ Fri Apr 29, 2005 10:25 pm ] |
| Post subject: | |
All racers use a LSD |
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| Author: | min13k [ Fri Apr 29, 2005 10:58 pm ] |
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man last time i had LSD i never came down it is a real downer man .... oh wow wrong lsd man (say it in a chong voice ie chech and chong) makka |
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