Eibach pro-kit spring rates

[eyeballs]

A phone call to eibach gave me some good info:

Front - 137 lbs/in (24N) linear
Rear - 77/114 lbs/in (progressive)

1.2" drop front and rear.

I'm currently trying to track down the OEM rates and will update.

 

[skullsroad]

Found spring rates for Tanabe DF210, for comparison sake.

Front - 123 lbs/in with a 1.7in drop.
Rear - 90 lbs/in with a 1.6in drop.

So, lower and softer than the Eibachs....

 

[eyeballs]

great...lets keep this going. BTW I had the tanabe GF's ("grip feeling"...their stiffest spring) on my WRX with STi struts and and they were still too soft...had to roll my fenders. Before that I had a set of the tanabe coilovers...they sheared apart on me at a track event. I'm not such a big fan of tanabe anymore.

 

[skullsroad]

Wow. I got hit and dragged by an 18-wheeler and my right front Progress coilover, on my NX2000, only bent at the mounting point. I emailed them hoping they would start R&D for the MZ2.

 

[eyeballs]

Wow, hope that was at low speed. You must've been a little nervous in that little nissan. I've heard good things about progress (or at least GRM always seems fond of their stuff). If I was in the market for coilovers for mainly street use, I'd consider the ST's since they are essentially non-stainless steel bodied variant-1's. We've actually got it pretty good as far as aftermarket options go for mild suspension upgrades (if you forget about damper-only options). I'm sure Koni's got to be working on something though...I can't imagine they'd ignore us for too long. Sport and FSD options would be nice.

 

[Max Archer]

Wait, linear front with progressive rear springs? Is that a thing on these little FWD cars? I've never heard of that before but I've also never built an FWD car for the street before this one.

 

[inspekt]

Anybody have spring rates for Racing Beat and H&R springs for comparison's sake?

 

[eyeballs]

OK here is who DOESN'T know the OEM spring rates:
mazda parts
mazda service (not in the shop manual)
mazdaspeed
mazda usa customer service
racing beat (don't know their own rates either)
h&r (don't know their own rates either)
corksport
tri-point engineering (guy I spoke to is going to get back to me if he can find out, but seemed doubtful)

how is this possible???

Maybe someone on here that has theirs laying around can find a shop who can measure the rate from a front and rear spring. It just doesn't make sense that info as simple as the OEM spring rate is this hard to find out.

 

[Racebrewer]

The aftermarket guys know their rates. They just don't like to give it out. Possibly some misguided liability issue.

H&R in Germany gave me rates for my Integra years back. No qualms.

John

 

[DrWebster]

Try calling Tein, they're apparently developing S-Techs for our cars now. There's a good chance they'd measure the rates of the OEM springs so they know what targets to hit with the S-Techs (my understanding is that the S-Techs are really meant for the drop only, and try to match OEM performance).