Outer Limits 4x4 Board

I have a customer that i am bringing gear in for & I am getting 14" coilovers as part of the order.
It is a '96 model dual cab & is going to be a Winch Challenge style build that will be used in comps.
What I am chasing is if someone has an idea on what coilover rates would suit ?? I was thinking 2 stage 12" top 14" lower but from there I have no real idea on corner weights for this style of vehicle for winch comps. He initially will only be running coilovers , 4" bumps with 4 link fr & rear but depending on how he goes in events as to whether he will go further with Bypass.

Any help would be appreciated.



brooksy

I imagine you have allready thought of this. Would'nt the guys you are buying it from in the states have pretty good idea of what a Hilux is and be able to valve the shocks pretty close and sought you out with suitable springs. Downsouth Motorsports in the states should be able to help you. Theres a few good vendors on pirate 4x4 too. If the spring proves to wrong, as long as there in good condition you should be able to manage some kind of exchange.

Hey broosky have a read of this mate, i asked the same question a few months ago and ended up getting some awesome responses...

http://www.outerlimits4x4.com/viewtopic ... 2&t=205192" onclick="window.open(this.href);return false;

What these guys dont know, aint worth knowing

hope it helps

Normally you start with known ride height and the corner weight in lbs (on the coilovers, not tyre on ground).

From the ride height you can determine how much the coilover springs have been compressed in inches. Then as the corner weight is required to compress the springs by that amount and spring rate is load/deflection (lbs/inch), the required rate is corner weight (lbs) / spring compression (inches).

Usually the coilover is inclined in and back/forward at the top, so you need to adjust the corner load by dividing by the cosine of the inclination angles, before dividing by the spring compression.

Then you have the combined spring rate of both springs - this is different to the rate of each single spring and if you are using a dual rate kit the upper spring is often different to the lower spring.

The top adjusting nut can give final adjustment to ride height.

Good quality coilover springs such as Eibach can be used to check the load on the spring that you used in the calculation above by measuring how far they compress at ride height: load = spring rate x spring compression - best to use a single spring for this check and adjust the nut down to suit the spring height.

You should then calculate the suspension frequency, front and rear and make sure they are both acceptable. See link that Elmo posted.

The guys at locktup4x4 helped me out with my coilover spring rates , maybe give them a call and have a chat .. Specially Jason , they seem to specialise in hilux / 4runner stuff so should be able to help you .