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The KW coilovers have a spring rate of 970 in/lbs front and 515 in/lbs in the rear, which compares to the stock spring rate of around 680 in/lbs front and 380 in/lbs in the rear. The stock spring rates varies quite a bit year to year in GT-R’s, so yours might be different.
The construction means that they are quite a bit lighter than the stock dampers even with the remote reservoirs. We are striving not to add any more weight to the already super heavy GT-R.
The Clubsports also have a dust shield to help with long seal life and a microcellular urethane bump stop. This allows for a smooth transition to bottoming out that is less likely to upset the chassis in case of the damper bottoming out.
In the above picture of the front coilovers, you can better see the rubber boot protecting the spherical bearing of the top mount. You can also see the bracket that holds the brake line and the wheel speed sensor wire.
A lot of the weight reduction is in the mounting forks at the bottom of the shock bodies. On the stock part, this appears to be a bulky, heavy iron casting.
To get at the upper rear shock mounts, we also found that the entire rear of the car’s interior had to be carefully disassembled as well. Since the GT-R is an expensive car, a lot of care had to be taken to prevent from damaging the interior, which took a lot of time.
