Thursday, Dec 02, 2004 at 12:28
OK, myth No 1 to dispell from your reply
The articulation is controlled by the shock compression and length and bump stop location, lifting the vehicle doesnt change these unless you change the shock [like I have which now improves total travel] and vehicle hieght change just changes the position the vehicle sits between the upper and lower limits, just like a live axle.
The advantage then comes from having all your front end settings being able to ensure the car handles correctly, and to suit the tyre you run [I tend to sent more neg camber for mud
tyres to help turn in with tread squirm] which is certainly easier and cheaper on a IFS than a live axle unit.
Now, yes, when compressed the crossmember becomes closer, but the
tyres are still adding traction to the ground, but the reverse is also true, where clearance improves when
suspension extends, like when pointing uphill.
As for dragging the crossmember, well, it wouldnt have a nice smooth bash plate fitted to it, if it wasnt meant to drag sometimes ;-)
Now going back to your original reply of "long rutted hill raining etc, live axle for you, I simply added my experience to show what you were thinking wont always be correct either, as on the hill we were on, it was very wet, in a pine plantation, on a yellow clay hill, up to a switchback, where water had erroded a deep rut on one side, along with bike/4wd use, and there wer esome pine trees across the rut as well, and because it was uphill, and my IFS had more clearance, and my rear diff was smaller it also had more clearance for the same tyre size, I was dragging, but only enough to notice, not to stop,a nd I managed to get my car over excpt for the rear axle not only the ground, but the pine trees as well laying over the top, where as the vehicle behind me with same
tyres as mine, same pressures, was unable to get out of the rut, and it had a 12-15 ft drop off the side if you did anyway, and it was dragging the front diff, the rear diff, and the gearbox xmember, and we had to dig, shovel in the ruts, broke an ARB extension strap on the winch, and had to snatch block with his 10000lb winch, while i turned around and hooked my 9500 HS onto him as well to get the car to move, which took us 3 hours to do.
I also find that the iFS works extremely well on snow, with one front tyre not upsetting the other, when making fresh tracks in fresh snow, [as some people here who have been snow driving with me have seen] and it also makes for a great vehicle in sand when the front wheels are independent of each other,a nd more neg camber is introduced as the
suspension compresses.
Now Im not going to say pajero and hilux early IFS hasnt tainted some peoples ideas on IFS, but like everything that devlops, its doesnt mean it cant improve, be improved, or simply be no good, because you dont understand it.
Off road racing truggies run IFS with 32" of wheel travel, sure its expensive to make, but its possible, and as IFS gets 100 years development or more, like the cheap to produce live axle version, it too will become better price orientated, but until you have actually tried it, I feel you may struggle to comprehend it, hence your statements in your replies, though at least your asking some questions as well to try and better understand the differences.
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