... I don't have spacers on my Cali .. maybe I would mount them but I don't understand why someone mounts different thicknesses in front and behind ... I have always known that the spacers must all have the same thickness otherwise the behavior of the vehicle changes .. .. or not?!
The theory side is that if you add spacers, effectively your reducing the spring rate. So in a scenario where you add width to the rear and not the front, the front has to control more of the weight transfer. So it loses grip. The rear would gain grip. Promoting understeer.
Another way to consider it. Imagine your wishbone was a wheel barrow. Where the axle in the barrow is the bolt that's holds your wishbone to the chassis. The bucket on the barrow is where your spring presses down. The handles of your barrow is where the van wheel would act upon. The longer you make the barrow handles, the easier it is to lift the load. Likewise, the longer the distance from chassis bolt to wheel (by adding spacers), the easier it is for the spring to be compressed by the weight of the van.
Newton's third law. 'For every action there is an equal and opposite reaction. So your wishbone is pressing up on the spring with the same force as the weight of the van is pressing down. Hit a bump in the road therefore, the longer the lever, the easier it is to compress the spring. Assuming the shock absorber is the same.
However, the difference most folk run between front and rear spacers, seems to be 5mm. So probably depends on how calibrated your arse cheeks are, as to whether you'd notice a difference. Unless of course, your running a track van.
