Anyone know an HKS dealer that holds HKS springs. I know HKS Japan sell different spring rates on their setups but i was just wondering if there are any US dealers that have them.
I'm looking for 10kg springs for the Hipermax III coilovers.

 

bump

 

Might want to try bulletproofautomotive. They carry an extensive amount of japanese company parts that are hard to find. They are a vendor also.

 

You don't need an HKS spring. They don't make their own springs, so all you need to know is the ID and length - Eibach, Swift, H&R, Tanabe, and others all sell universal race springs in various ID and lengths that you could use. I'd be at least 1, if not all, make them in the measurements you need for the front. For the rear, it is more difficult

your options for the rear

1. measure the ID of the rear spring top and bottom from HKS, as well as length, and match it up to one of the other brands to see if it will work

2. buy the SPL rear midlink and then choose your own spring rate, as it uses a conventional diameter/length race spring

3. contact hyperco (or similar, there are many out there) and give them the measurements and see if they will make you something

Personally, I would not even bother - it would take some very sophisticated datalogging equipment and literally hundreds of hours of logs to know if a 1 kg/mm change (~56 lbs) is even necessary or beneficial

 

Thanks for your input. I'll see how it go's at the next track event and then make my decision from there.

 

I wouldn't let 1 track day determine your spring rate choice

 

I mean the next competitive one. I've already done three track days with these coilovers. I just want to see how well i do on the next event and then take it from there.

The coilovers are great, but i just want to reduce the body roll a bit more. I definitely feel as though the dampers could handle and extra kg/mm with affecting the dampening. Although as you say, you would need a lot of testing to see if its actually made any benefit.
Still with the extra kg i should be able to reduce the roll a bit.

 

body roll can and should be adjusted via sways, not via springs

 

I've been told that the sways should only be there to assist the springs.
Either way my progress sway bars are already at full stiff when i'm on the track.

 

This may sound dumb but have you adjusted the coilover?

 

Yeah. I've had it at full stiff. The dampening is great, i just need a little less body roll.