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and not linear. Mike Kojima's Project Z, has a dual coil set-up and his is semi-progressive also. He uses 500lb stiff spring and 200/250/300lb tender spring for fronts. For the rear it's 300lb stiff spring and 150/200/200lb tender spring. I talked to the tech guy at Ground Control and said that all their springs are semi-progressive, as that's the way Eibach likes to sell it to them for performance reasons. The tender ERS springs however are progressive and not semi. Still semi-progessive isn't as good as progressive, as far as ride and spring seating(underload) goes but still better than just plain linear, for street applications. In this situation, its a good idea to go with a Ground Control dual coil set-up for a softer ride and performance, instead of just the single set-up which will sacrifice one or the other. The other coilovers out there offered use more of an agressive spring rate set-up for their tender springs and don't come with a progressive tender spring but a linear. This is because the other kits offered,are for track applications and not intended for the street. If you have
ever ridden in an HKS Hiper Damper set-up it still feels like it should be used for track applications, although tolerable for the street. I haven't been in a TEIN dual coilover set-up, so I wouldn't know but still based on the same design as HKS one, only difference is HKS is much lighter because the struts and mounts are made of aluminum. So, for anyone with money Ground Control,would be the best set-up for the street if your only buying the springs but if your buying the full coilover set-up it best for street and track because it offers the best of everything(materials)down to the oil used. The design of the strut/shock is even a nice piece of work which is designed for street use. You can even customize the shocks for a more tolerable street use. So, basically, it all comes down to the perfect customizable shock and coilover spring, just costs too much money. I used to love the TEIN's because of they were the most affordable ones out there, until HKS came along with a better set-up being that it was half the weight, if you compare and pick up a TEIN and then pick up an HKS full set-up you can see there is a dramatic weight difference and at the corners were weight is being constantly shifted,it makes a difference. That is why pro-alignment shops add weight on the drivers side before doing alignement.The TEIN's don't even come with the pillow ball mount and it's optional. The HKS ones come with it so,
between the two,HKS is a better choice. Ground Control
set-up is in another league of it's own with it's thicker shafts, customizable shocks/struts/ and springs and the fact that you can rebuild them.
Regards,
Jeff
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