2002 172FF LSD or not ???

[D1CKY]

I have an 02 plate ff 172 and was wandering does my car have an lsd ?

Or something else that stops like the left front whell spinning and puts power to the one on right if it has grip ??

E.g in snow mud etc ???

Cheers

 

[Chad]

No LSD but you may have ESP (you'll have a button on the lower dash to the right of the steering wheel to turn it off if you have ESP). Personally I don't like the ESP on my 172 so I always turn it off. It probably saves a few people from totalling it but I find its either too slow or over intrusive and makes the car react in an unatural way on the limit. Also the only time you should need it (on snow or ice) the manual tells you to turn it off as it won't cope with slippy conditions.

 

[MillerLight]

If the ESP is off does that effect the ABS?

 

[Chad]

If the ESP is off does that effect the ABS?

no

unfortunately, it would be easier than removing the fuse.

 

[D1CKY]

BUMP

 

[team_penetrator]

No they dont. Although the muppets in my local Reno dealer thought it did...

Think the ESP works by reducing power/applying brake to the spinning wheel.

 

[GordonD]

No they dont. Although the muppets in my local Reno dealer thought it did...

Think the ESP works by reducing power/applying brake to the spinning wheel.

The ABS is designed to cope with loss of traction under acceleration. It reduces engine power if either front wheel is spinning. So your acceleration is limited by the amount of grip the wheel with the least amount of grip has. An LSD in the same circumstance would transfer the power to the wheel that has grip.

The ESP is designed to cope with possible loss of control. It applies the brakes, I think only on the rear but I'm not certain, and may also reduce engine power.

Interestingly GM Holden produced an off-road capable 4WD that doesn't have any form of limited slip diffs. It uses the ESP. If, say the front left wheel is spinning it doesn't reduce engine power, it just applies the brake enough on the wheel that's spinning to transfer the power being wasted to the wheel on the other side that has traction. If both wheels on the same axle are spinning it applies the brakes on both so the power is transferred through the central diff to the other axle. Its a simple obvious idea that's only disadvantage is that it must wear out the brakes quicker. You wonder why other manufacturers don't do it. If one wheel is spinning apply the brake on that side. And only if both are spinning do you reduce the power. No hardware required to get the equivalent of a limited slip diff, just software changes in the ABS/ESP computer.

 

[Peperami]

The ABS is designed to cope with loss of traction under acceleration. It reduces engine power if either front wheel is spinning.

What does abs do??

Abs, or the 'anti-lock braking system' stops the wheels from locking up on the limit of braking grip, by pumping the brakes on and off really quickly...

 

[Fred@BTM]

ah ha mr peperami, the abs sensors also detect wheel speeds during all conditions, if they detect one wheel traveling faster/slower than another traction control/esp comes on

ABS and traction control are often linked together in this way

 

[Peperami]

Ah, i see. So its the abs sensor that stops the wheel spin, by telling the esp to reduce power to those wheels. But not the abs itself?

 

[Fred@BTM]

erm, kind of, if both front wheels are spinning faster than the rears then it will cut engine power

but if you c**k the inside rear right wheel, it will jab the front left brake on etc etc

it controls both

 

[Chad]

but if you c**k the inside rear right wheel, it will jab the front left brake on etc etc

it controls both[/QUOTE]

Thats the bit I don't like about the ESP, if you lift off mid bend at speed and the rear slides out it brakes the front to straighten the car up just as you start to give it some opposite lock. It just doesn't feel right to me as it takes over too much.

 

[Rob_]

Not all 2002 172's have ESP either

 

[Clart]

esp is for gheys

 

[psycho]

The ESP on my 182Cup is so friggin lazy that I reakon I'd have to be already in hospital before it activated. That said, I'm pretty smooth with control input on the race track so that may be why its not kicking in (even in 3 wheel mode it dosnt/bearly kicks in). All in all im leaving it on cause it definitly dosnt cause me any dramas and may save my bacon if something unforseeable happened.

 

[D1CKY]

Ok cheers boys for info, i must have a poor boys 172ff as its got no ESP