4 link conversion discussion

[oldcorollas]

looks good so far!

do you anticipate the rotation/roll force applied to the diff, induced by the weight of the car, will be a problem? ie, turning the nose of diff upwards..

and also the large difference of moment arm length between the upper and lower links and the axle centre line?

[MWP]

Going to these lengths but still using Panhard instead of Watts?

[roadsailing]

yeah what lateral control method are you going ot use? considered a satchell link?

[Dimitri]

OC.

ill be honest and say i dont completely know what youre talking about.

design is based on what ive seen work/applied to competitive scratch built race cars that use a live axle.

the set up allows for pinnion angle adjustment, with top arms set to stock length the pinion is a few degrees misaligned from the t' shaft "flatter", as this seems to be convention.

as for the other comment, it does look a little extreme, but it is partially the mis-match of the other dimensions like the width of the bracket the are accentuating the perception.

i dont have or have access to a suspension analyzing program, so i guess ill just have to wait and see. over distance between the mounts is such that i can "move the diff down in the brackets" if i need to at a later date, though this will require another set of bracket of course.

decided on panhard for a few reasons.

its a drift car. has fuck all travel anyway.

its cheaper.

its easier.

its lighter.

it doesnt take as long to fab.

[oldcorollas]

what i was meaning was that, previously the weight of car is centred on the diff housing.
now, the coil over is at the rear of the diff centreline. all the weight of the car will be pushing on the back of the diff and trying to turn the front of the diff upwards (rotating around the axle line). as the car bumps ad rebounds, the force trying to rotate the diff, purely from car weight, will change, and change the loading on the trailing arms etc..

may not be a problem, so was just wondering if you had considered it.

but as you say, it is a drift car, so it will not have much roll or squat to affect geometry, and no real hassles with traction
(edit: i mean no hassles in that no traction is a lot softer on geometry changes than trying to maintain traction, and i was thinking along the lines of tramp control etc)

[Dimitri]

hadnt really considered it. its basically convention to set up a live axle coil over in such a manner, especially in a sedan/uni body vehicle with packaging constraints.

not a whole lot of leverage really for it to have much effect, considering the length of the lower radius arm bracket.

should note the lower coil over mount position has not been finalised, and the diff isnt sitting where it will be at ride height in any of the photos.