RE: Ask the expert: All you want to know about differentials
Discussion
How about a bluffers guide to differentials - including the pros/cons of
Standard (whatever that really means)
Limited Slip Diff
ESP Diff's
Torsen Diff
Viscous Couplings ? (I think I'm out of my comfort zone now, but I'm sure you can add to the list)
And what parameters you can introduce on each type - so with an LSD how you can limit the slip and the control behind this.
All of the above is generally available on t'interweb but great to have all in one place on this site.
Rog
Standard (whatever that really means)
Limited Slip Diff
ESP Diff's
Torsen Diff
Viscous Couplings ? (I think I'm out of my comfort zone now, but I'm sure you can add to the list)
And what parameters you can introduce on each type - so with an LSD how you can limit the slip and the control behind this.
All of the above is generally available on t'interweb but great to have all in one place on this site.
Rog
Kawasicki said:
Is it always the case that a lsd will induce corner entry understeer?
Surely partially locking the rear tyres together can also induce (non power) corner entry oversteer, as the total grip of the rear axle will be reduced because each tyre is not independently free rolling, and therefore not capable of producing maximum lateral grip.
A couple of questions I was going to ask too.Surely partially locking the rear tyres together can also induce (non power) corner entry oversteer, as the total grip of the rear axle will be reduced because each tyre is not independently free rolling, and therefore not capable of producing maximum lateral grip.
Edited by Kawasicki on Thursday 23 February 10:42
Also what sort of difference in reaction times is there between a mechanical limited slip diff verses an electronically controlled device?
clarkey said:
Yes, an LSD can induce understeer. If you are going round a bend, the inside wheel needs to turn more slowly than the outside wheel. An LSD will limit the difference in turning speed between the two wheels, which could cause the car to push on in the bend rather than turn (ie understeer)
Think of it like a kart, which has no differential. To avoid understeer in a kart you have to get the inside rear wheel to lift.
Once an LSD starts to "lock" under acceleration it will promote understeer, the idea is that you should be winding off the steering and adding power when it happens. If you get on the power too early the result can be quite embarrassing...possibly even expensive just in a different way to a car without an LSD.Think of it like a kart, which has no differential. To avoid understeer in a kart you have to get the inside rear wheel to lift.
Different types of LSD show different behaviour though. Some give up if you lose traction completely on one wheel - that really does give big understeer.
doogz said:
Stuart said:
Please could someone explain the offside rule. Ideally with (not too complicated) diagrams.
Once I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
Only as long as you reverse with your left arm around the back of the passenger seat.Once I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
clarkey said:
Yes, an LSD can induce understeer. If you are going round a bend, the inside wheel needs to turn more slowly than the outside wheel. An LSD will limit the difference in turning speed between the two wheels, which could cause the car to push on in the bend rather than turn (ie understeer)
Think of it like a kart, which has no differential. To avoid understeer in a kart you have to get the inside rear wheel to lift.
Surely the delta between the inside and outside wheels will be below the threshold at which an LSD begins to intervene?Think of it like a kart, which has no differential. To avoid understeer in a kart you have to get the inside rear wheel to lift.
Otherwise you'll get one wheel dragging like a truck in a tight turn.
Stuart said:
Please could someone explain the offside rule. Ideally with (not too complicated) diagrams.
Once I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
The basics:Once I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
A player is offside if there aren't two opposition players closer to their goal line than he, at the moment the ball is played.
A few details:
The offside law only applies to an attacking player, who is 'interfering with play', whilst in the opposition's half. It only applies to a ball played forwards. You can't be offside from a corner or other ball played backwards. Nor a throw-in. In too-close-to-call circumstances, the referee is to give the benefit of the doubt to the attacking player. To be level with the 2nd to last opposition player is to be onside.
To explain it in proper bloke style I will need 4 or 5 items from a normal dinner table, and you will need to be much more attractive.
BarnatosGhost said:
Surely the delta between the inside and outside wheels will be below the threshold at which an LSD begins to intervene?
Otherwise you'll get one wheel dragging like a truck in a tight turn.
Indeed, I always presumed this was why they were 'limited slip', rather than 'locked'!Otherwise you'll get one wheel dragging like a truck in a tight turn.
Stuart said:
Please could someone explain the offside rule. Ideally with (not too complicated) diagrams.
Once I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
Here you go, courtesy of Chrysler in the 1930s. http://www.youtube.com/watch?v=K4JhruinbWcOnce I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
Stuart said:
Please could someone explain the offside rule. Ideally with (not too complicated) diagrams.
Once I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
http://www.youtube.com/watch?v=QxSpovGp65wOnce I've understood this and how a diff works, I'll get some sort of badge which confirms that I've qualified as a bloke, right?
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