XX4 Carpet set-up

[slimboyfat]

any ideas??

i'm going to use pins but tried for the life of me and the one meeting i've done to stop the thing flipping on every corner an failed!

oil/pistons/springs would be most appriciated and i spose if i could get a base set up i couldd work from there.

thanks

[DA_cookie_monstA]

slam it to the ground, with yellow minpins, you really need to limit the shocks to lower the ride hieght, and most important, stop the inside suspension lifting.

As for oils I never found to need to run much more tha maybe 5 or 10 weight heavier than outdoors with any car, as long as it was lowered

[Doughty]

I would seriously try locking the suspension right up, if you are running yellow minipuns there should be enough flex in that to deal with a flat carpet track

I suggest giving the following a try

us the shock limiters to fill the shaft inside and outside so you have around 3 or 4 mm travel up and down from a nice low ride hight, then fill up that with some soft rubber O rings (same as the shock seals) just keep your standard oil and spings on and see how that does

then dial in the ballance through camber, toe in and chopping spikes off the front tires.

could even look at getting the street weapon shock towers on it and running shorter shocks all round

[tyreman]

Trouble with that setup Chris, is that they will be adding jumps, rumble strips and other obsticles to the track.

ps: have you or your dad seen the astro turf track at the rugby club in Coventry?? ??? looks awsome ;D

[Doughty]

shame, I was under the impression that it was a typical capet track touring stylee.

PS - send me some info then!

EDIT - you should have a look at roll bars of some kind front and rear, see if that helps

[DA_cookie_monstA]

I used to use a slammed setup in Wales, and some of the tracks would use gym mats and all sorts of things, it still works, as you wouldn't be hitting them too fast anyways, and you will kill anyone in the corners with that setup too....

Try it.

[slimboyfat]

if i ran on all inside holes on the towers and outside holes on the wishbones so the thing is as flat as possible would that work??

[Doughty]

yes and no,

it may seem to work as you are making the shocks at more of an angle to the floor but your wishbone will still move in the same direction

what the angle actually does is changes the 'rolling rate' of the springs, this is something that I dont really understand but here goes a quick heads up on the theory

if you have the shock strait up to the wishbone, the 'stiffness' of the spring will be the same pretty much thoughout the whole travel (give or take a bit to compensate for the arc of the wishbone) this is because the shock stays at the same angle to the wishbone for each 1cm the wishbone moves ths shock compresses by 1cm making a 1-1 ratio

no if you have the shock at say 45 degress when you move the wishbone by 1cm the shock compresses by 0.5cm.

however, when the shock it at an angle, as the wishbone compresses the angle of the shock relative to the wishbone gets more

so

at the start of the travel your wishbone moves by 1cm and the shock moves by 05.cm as it is at 45 degrees, but when you get a bit further up the travel your shock will be at a greater angle so when the wishbone moves 1cm your shock may be at 30 degrees and would only move ~0.3cm making it softer as you get closer to the top of the shock

OK, thats all well and good but that is all in a perfect world, in reality the arc of the wishbone is quite a lot so its not as simple as above.

but that is my theory, I would love someone to clarify or correct me on this.

hope that helps.

so to answer your origional question... I dont know! ::)

I know that on the back of the 2WD car we went out on the top of the rear shock tower to stop the back end from 'dumping' in the corners.

[DA_cookie_monstA]

Chris, I think I know what you mean, and it is easy to explain if you had a peiece of paper.

Straight up, you would get a large initial shock compression with the compression movement getting less compared to wishbone travel as the wishbone moves up.

With the shock at 45', you get a large initial wishbone movement for a small amount of shock movement, the shock compresses more and more as the wishbone moves up.

At one angle, the compression will be completely Linear, so the shock reacts exactly the same all the way though the wishbone arc.

The only way to compare it is with the Throttle curve for your transmitter.

Witht he curve on the top and tailing of, that would represent the shock movement for an upright shock, with the curve below the line, that would be for a shock at say 45'.

[Doughty]

indeed some diagrams would be very helpful