LSD (not narcotics)

Mihajlo · Post by **Mihajlo** » Sat Nov 04, 2006 11:24 am

Greetingz to everibody!
I have a fiev simple questions...

1. did anibody put a LSD in their car?
2. how smart is to put a LSD in a car that will be sometimes driven on track and mostly on public roads
3. price of LSD and manufacturers and also availability of those mentioned before...

thankyouwerymuch!

Daniel · Post by **Daniel** » Sat Nov 04, 2006 3:25 pm

Hi,

Sorry to ask. What is LSD?

Daniel

daewoomofo · Post by **daewoomofo** » Sat Nov 04, 2006 4:16 pm

limited slip differential

kinkyllama · Post by **kinkyllama** » Sat Nov 04, 2006 7:44 pm

Mihajlo wrote:Greetingz to everibody!
I have a fiev simple questions...

1. did anibody put a LSD in their car?
2. how smart is to put a LSD in a car that will be sometimes driven on track and mostly on public roads
3. price of LSD and manufacturers and also availability of those mentioned before...

thankyouwerymuch!

1. Yes I have, at least 10k miles ago.
2. As far as my LSD goes (Quaife) I'd say its safer on the street and track.
3. I think I paid around $1,200usd for my unit.

I do road racing and lots of daily driving and I'd have to say its safer than without one. You grip much better in a straight line and much much better through corners and it makes the car much more predictable. Before you hit the gas through a corner and it'll push to the outside and be a bit less predictable. With the Quaife lsd it goes exactly where you want it too.

Mihajlo · Post by **Mihajlo** » Sat Nov 04, 2006 10:31 pm

thanks kinkyllama that's what I wanted to hear!

Slammed · Post by **Slammed** » Sun Nov 05, 2006 12:43 am

well this sounds interesting does anybody have any links to lsd for lanoses?

Mihajlo · Post by **Mihajlo** » Sun Nov 05, 2006 10:32 am

I think there is no specific link for Lanoses because it shares gearboxes and engines with GM family....
here, try these http://www.quaife.co.uk/catalogue/index.asp

daewoomofo · Post by **daewoomofo** » Sun Nov 05, 2006 4:17 pm

i heard that a guy on here "GSE Turbo" was making lsd difs, he is making a "plate style" not sure what that means but they are suposd to be alot less expencive. Tom said they do make noise when you take a corner but its normal and ok. when i can afford a lsd thats what im gonna look for

Mihajlo · Post by **Mihajlo** » Sun Nov 05, 2006 6:12 pm

daewoomofo wrote: when i can afford a lsd thats what im gonna look for

+1

Post by **PrecisionBoost** » Sun Nov 05, 2006 8:01 pm

Lanos,Nubira,Leganza, Optra,Optra5, Forenza, Reno, Aveo and Lemans use the same quaife F16/F20 ATB differencial Kinkyllama purchased.

Actually it's PontiacJeff that makes the plate type LSDs and he's waiting for me to send him a differencial from a spare F16 in my garage.

I have to either purchase or make the tool to remove the differencial (special notched tool ) then it will be on it's way down to him.

Plate type LSDs and torsen gear type ATB's (such as Quaife) are very different in operating method.

Torsen = torque sensing
ATB = Automatic Torque Biasing

A quaife ATB will never wear out because it's a series of gears... there is not slippage at any point.... where as the plate type differencials have a limited life which primarily depends on type of use and how it's set up (preload settings determine when the LSD kicks in )

Plate type differencials are like a clutch.... and the preload is like the pressure plate..... any time you turn a corner or one wheel moves faster than the other it's like engaging the clutch.... the plates start to slip... and as one tire starts to move faster it clamps down like a pressure plate causing the clutches to grab and send torque to the other tire.

The plate type LSD's are cheaper and are very good in a straight line where as the Quaife ATB will be better around corners.

Typically Drag racers will pick the plate type LSD's because they are adjustable and easy to setup exactly how they want them and road race guys will use the Torsen based differencial (quaife).

Chris

daewoomofo · Post by **daewoomofo** » Mon Nov 06, 2006 12:57 am

ah ok, i thought it was GSE, i stand corrected (sorry). good info on the difference. can a plate style be rebuilt if it wears out or is it a one time use?

Post by **PrecisionBoost** » Mon Nov 06, 2006 2:41 am

Yes.... you can rebuild it.... change the preload... change the friction disk material (more aggressive or less aggressive)

That's part of the reason why they are popular with drag racing.... the LSD can be adjusted to what ever specifications you want.

A Torsen ( stands for Torque Sensing ) system such as the Quaife ATB isn't a true limited slip.... it will let one tire spin freely under certain circumstances.

The Quaife ATB is very smooth.... where as the plate type can "grab" and then "let go" and then "grab" if your at just the right amount of torque and speed differencial between tires.

Thus.... the Quaife is prefered for road racing.... they make the transistion of torque very smooth which makes the car extreemly predictable.

There are a few variants to the plate type LSD.... I think most are completely flat pieces.... others have small "ramps"

The ones with Ramps tend to "click" as you drive around the corner.... it's almost like a ratchet.... hard to explain without a good picture.

There is also another type of LSD.... viscous type.... which can be very very good if the fluid is new and it's setup well.

Basicly..... as one wheel spins the fluid imparts torque onto the other wheel.... so it doesn't have the "grab" "let go" problem.

Some Viscous LSD's are so good that they will give better lap times than a Quaife.

Unfortunatly I doubt there is a Viscous LSD for our transmission.... I know there are Torsen and plate types in production in the UK

delphis · Post by **delphis** » Mon Nov 06, 2006 2:48 am

the vlsd are a very popular add on to the 240s but like chris said I have never seen a VLSD for a gm product.

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LSD (not narcotics)

LSD (not narcotics)

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