How To - Tips > Steering / Suspension

coil overs naerc

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AdrianBurton:
here is a calculator
http://www.ridetech.com/info/spring-rate-calculator/

Graeme Stebbing:
Hi Jim, Yes I get what your saying, the shocks are Toyota Soarer Air bags and  don't have springs at all. they have a chamber at the top that acts like a reservoir of air, and a very complicated system of moving air from a reserve tank via solenoids to each of the struts as required, the system is very sophisticated for 1991 and it moves the air around depending whether you are braking, turning or accelerating, it even moves it from side to side of the car if you swerve to change lanes rapidly, to reduce body roll, as well as moving the air to the rear to prevent rear squat. The system also raises the car on gravel or rough roads. and lowers the car the faster you go.
As far as changing the mounts on the bottom I don't think getting a face full of molten metal as the gas escapes is a good choice either. The brackets are about 3mm thick so the best idea I have come up with is to find another bracket off another similar type of shock, and weld the eye from another shock onto the 3mm remains of the original bracket without heating up the bottom of the shock to much, so you don't break through the bottom to the gas charge. Guess I will just have to be very careful but I think it might be doable
Lambo

01Lambiero:
Wouldn't the difference of axle weight factor into the different spring rates required for an optimal drive package?  or is the confines of the front suspension travel that dictates different spring rates up front?  Jim

jdinner:

--- Quote from: lambo on April 22, 2013, 06:12:12 PM ---Thanks Jim that makes it clear. I am trying to use the OEM Toyota air shocks in my project and they are about 630mm extended so some design changes for the top mounting points and the lower arms will be needed, the other issue I face is that the OEM shocks for the front of my donor are much harder than the rears, the fronts have an eye and the rears a u shaped mount, assuming the shocks need to be swapped front for rear so the beefy ones are in the rear for the weight of the motor, then the lower mounts will need to be swapped, which raises the question of how do you weld the swapped mounts on without loosing the nitrogen in the shocks any thoughts.
Regards
Lambo

--- End quote ---

I would not be welding the pressure chamber on a shock ever. Don't do it.
Keep the shocks/struts in their original location and experiment with stronger springs.

jdinner:
MM, I think the naerc widetrack is a single coil spring in the rear, right?
If it is you should be looking at a 450# to 500# spring for the rear.
Above I was merely talking about the naerc replica chassis and geometry in other setups will very widely.
If you have adjustable coilovers in the rear you should start with a 500# spring and set your ride height with that spring.

When I was trying to set things up I contacted a local hotrod shop that has springs for sale and told them my problem.
They said as long as I didn't damage the springs I could return them. Three trips and three different springs I found the combo that works great.

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