Suspension Spring Rate/Coilovers advice when used with roll bars.
I would run softer spring rates than most of us do here in the U.S., especially if your B-roads really are horribly rough. I would suggest a 6kg/mm front and 4kg/mm rear as a good starting point. This will allow the car to use its suspension travel and rely on the stiffer swaybars to keep the corner frequency in check. With these spring rates you will need to preload them a little bit in order to get the car to sit about in the middle [or biased towards more droop travel if you're emulating the stock feel of the car] of its overall suspension travel.
As reference, the stock MCS spring rates are about 4.5kg/mm front and 2.3kg/mm rear. The reason you do need a stiffer set is because coilovers usually reduce overall travel, and you need more resistance [coupled with higher damping shocks] to reduce travel required per instance.
The BC's do not come with rear adjusters however they are easily ordered. You can use a standard 2.5" coil with the BC's. I use Swift springs as they are superior to others in terms of rate consistency over travel and they're also lighter using a higher grade material.
I hope that helps,
Ryan
As reference, the stock MCS spring rates are about 4.5kg/mm front and 2.3kg/mm rear. The reason you do need a stiffer set is because coilovers usually reduce overall travel, and you need more resistance [coupled with higher damping shocks] to reduce travel required per instance.
The BC's do not come with rear adjusters however they are easily ordered. You can use a standard 2.5" coil with the BC's. I use Swift springs as they are superior to others in terms of rate consistency over travel and they're also lighter using a higher grade material.
I hope that helps,
Ryan
4th Gear
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I think I'll go with the 6kg/4kg setup too, streets here in Italy are pretty bad...
Are the 6kg springs for the front linear shaped or barrel shaped?
Eibach lowering springs won't be much stiffer than stock in order to stay within the stock dampers capability. This is the case with most lowering springs. I don't have exact rates for them however.
I would run softer spring rates than most of us do here in the U.S., especially if your B-roads really are horribly rough. I would suggest a 6kg/mm front and 4kg/mm rear as a good starting point. This will allow the car to use its suspension travel and rely on the stiffer swaybars to keep the corner frequency in check. With these spring rates you will need to preload them a little bit in order to get the car to sit about in the middle [or biased towards more droop travel if you're emulating the stock feel of the car] of its overall suspension travel.
As reference, the stock MCS spring rates are about 4.5kg/mm front and 2.3kg/mm rear. The reason you do need a stiffer set is because coilovers usually reduce overall travel, and you need more resistance [coupled with higher damping shocks] to reduce travel required per instance.
The BC's do not come with rear adjusters however they are easily ordered. You can use a standard 2.5" coil with the BC's. I use Swift springs as they are superior to others in terms of rate consistency over travel and they're also lighter using a higher grade material.
I hope that helps,
Ryan
As reference, the stock MCS spring rates are about 4.5kg/mm front and 2.3kg/mm rear. The reason you do need a stiffer set is because coilovers usually reduce overall travel, and you need more resistance [coupled with higher damping shocks] to reduce travel required per instance.
The BC's do not come with rear adjusters however they are easily ordered. You can use a standard 2.5" coil with the BC's. I use Swift springs as they are superior to others in terms of rate consistency over travel and they're also lighter using a higher grade material.
I hope that helps,
Ryan
fyi, the bc's now come with the rear adjustable cable included
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