| [ Total Views: 1547 | Total Replies: 11 | Thread Id: 43509 ] |
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 speedster356
A.k.a.: Peter Mcleod
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| posted on September 6th, 2005 at 12:38 PM |
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what style LSD?
Torsen or plated LSD for circuit/hillclimb etc?
I have a Modena Torsen style LSD available but some recommend a plated.
what are your views?
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
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| posted on September 6th, 2005 at 04:17 PM |
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Torsen
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71superbug
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| posted on September 8th, 2005 at 08:12 AM |
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any chance on expanding on this topic for those of us that dont understand.
What is the differences and what are the advantages of each type for what situation?
would be an interesting thing for those of us that have not yet tackled diffs and are wanting to get into a bit of motorsport.
Anthony
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GregWard
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| posted on September 8th, 2005 at 04:10 PM |
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Basically :
The "plate" style LSD uses friction plates or clutches inside it that under load basically end up locking together gradually,but always putting
power to both wheels at the same time.
You can set the "slip to grip" ratio by the amount of preload on the diff.
Advantages? Have some sort of friction even under off throttle conditions, so they are very good for high speed racing, say turn one at Eastern
Creek.
Disadvantages? more of an opportunity to understeer in low speed corners, but you can tune it out with some work!
Here's an exploded view of a ZF unit.
http://www.alfabb.com/bb/forums/showthread.php?postid=33954#poststop
The "Torsen' style LSD uses a series of gears inside it to provide the lock up. The difference here is, because the way the gears mesh against the
drive axles, it can feel which of the two wheels has the most grip and therefore the power is directed to that wheel.
Advantages? The difference here is that under normal driving conditions and off throttle situations, the diff acts like a non-LSD diff, making
cornering easier.
Disadvantages? Only thing I could think of is if you backed off at high speed (say 160kmh) into a corner and you had no form of friction braking other
than the engine, it might snap out at the rear of the car and increase the pendulum effect.
Not sure on that one, you'd have to ask someone who has one and races it, I've only got a ZF..... Craig?
One common theme between both styles....
"They're expensive!!!!"
Here's a torsen link
http://www.quaifeusa.com
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speedster356
A.k.a.: Peter Mcleod
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| posted on September 8th, 2005 at 04:35 PM |
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The Torsen under high lateral loads (and under acceleration) can "unlock".
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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Turbo54
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| posted on September 13th, 2005 at 02:20 PM |
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U2U debiasi4 (drag racing section) about the one he uses in his hillclimb car and drag car. Very strong, never heard of either of these problems
happening but I'm not an expert.
T54
C'mon kids gather round,
there's a new sensation hitting town,
It's moving straight, low to the ground,
it'll pick you up when your feeling down.
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speedster356
A.k.a.: Peter Mcleod
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| posted on September 16th, 2005 at 08:19 PM |
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Well the new diff is ordered from Stuart Wilkins Rallying here in Sydney. Kaaz 1.5 way plated.
$1470 to my door, price in the US was $880USD!!! so I think it's kinda OK....
so now I need.....
Check list...
spare gearbox................check
sprare axles....................check
spare CVs......................check
No real meat for 12 weeks to pay for it.........check
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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rubyred
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| posted on September 29th, 2005 at 08:14 AM |
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ive always heard that the clutch pack type lsds were the best for track..... porsche tried the torsion diff, but quickly went back to the clutch type.
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wombatone
A.k.a.: Michael
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| posted on October 7th, 2005 at 09:18 AM |
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was the LSD for a IRS or swing axle?
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speedster356
A.k.a.: Peter Mcleod
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Plastic not Classic Racing
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| posted on October 10th, 2005 at 06:28 PM |
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The LSD was for a Subaru gearbox.
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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speedster356
A.k.a.: Peter Mcleod
Custom Title Time!
Plastic not Classic Racing
Posts: 1624
Threads: 256
Registered: August 25th, 2002
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Location: CHRIST church NZ
Theme: UltimaBB Pro Blue ( Default )
Mood: Producing boost again in NZ
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| posted on December 8th, 2005 at 07:24 PM |
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Just some follow up. I've had the KAAZ LSD (plated) in for a couple of weeks now, after "running in" the diff doing figure 8s in the car park at
Wakefield Park I hit the track for some laps. I found the car to be transformed and so much easier to drive. When power is applied getting out of the
corner the car sits down and just powers out instead of smoking a wheel as it used to do.:P very happy with the performace........just a problem with
the poor old clutch now, seems hooking up 2 rear wheels at a time was just too much for it. New one being installed tomorrow....I've also found it to
be VERY noisy, I hope that it's not the way I assembled it when I had to fit the output stubs? :P
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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fullnoise
Fahrvergnugen
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| posted on December 11th, 2005 at 04:49 PM |
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Good idea
Hi Peter,
I saw the Buladelah (I'll never spell it right) Hillclimb DVD and you are Mr Squiggle. You come out of the corner put your foot down and leave a
black line with your left rear and back off slightly for the left hander then put your boot in again and leave another line with the right rear tyre.
How's your pulse rate?
Very cool.
CYA CT
esratrams
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