Obioban's 2005 IR/IR Coupe

[Tbonem3]

So FCM says they're linear, but the manufacturer says progressive?

[Mike RT4]

I called H&R just to ask, they confirmed it's progressive. They also refused to disclose their spring rates, but then how did someone get the 360/685 number?...

I fucking hate companies that do that. Makes me want to just forget about their product and go with TCKs – my thought was that the FCM stuff seemed alluring down the road, so I wouldn't have to buy dampers twice.

H&R Germany were more forth-coming .

Andy they said the springs were progressive front and rear....

The kit I am referring to is PN: 29355-1

[Obioban]

What am I looking at here?

817.3 DSC module— the zcp/csl module. More track focused/racey ABS and allows separate buttons for DSC and M track mode (so I can quickly turn off dsc again).

[mrgizmo04]

Can you regurgitate it? Do all pressure? dynos look like that?

Afaik, all springs are technically progressive? They're all harder to compress, as you're compressing them.

Hooke's law: resistance force = spring constant × distance compressed. Force is linear with distance compressed, so force vs distance graph is a straight line.

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[Tbonem3]

Here is the data. Looks linear.

Can you regurgitate it? Do all pressure? dynos look like that?

Afaik, all springs are technically progressive? They're all harder to compress, as you're compressing them.

[HighSchoolDream]

I don’t know what’s goin on, but this winter all my long time project goals with hard to acquire parts are coming together all at once. Not sure I’m going to have any more mods I want to do, come spring.

What am I looking at here?

[duracellttu]

Rears can not be 445lb. They might be a progressive 445-700lb or something but not a linear 445. You'd be on bumpstops all the time. Unless he's measuring at the wheel somehow? Which would mean 445 / 2/3rds = 674 which sounds right.

Funny if the fronts are 323lb, I chose 325lb for myself and feel it's really perfect.

Here is the data. Looks linear.

[Obioban]

I don’t know what’s goin on, but this winter all my long time project goals with hard to acquire parts are coming together all at once. Not sure I’m going to have any more mods I want to do, come spring.

[Tbonem3]

Something like 385-685 from memory. Progressive. Fronts were like 143lb/in, but linear. Looking at the fronts, I would have guessed progressive as well. In fact, I wouldn't be surprised if the fronts were actually something like 143-300lb, but I have no proof.

[r4dr]

Stock rear springs are around 380 aren't they?

[Tbonem3]

Rears can not be 445lb. They might be a progressive 445-700lb or something but not a linear 445. You'd be on bumpstops all the time. Unless he's measuring at the wheel somehow? Which would mean 445 / 2/3rds = 674 which sounds right.

Funny if the fronts are 323lb, I chose 325lb for myself and feel it's really perfect.

[duracellttu]

I called H&R just to ask, they confirmed it's progressive. They also refused to disclose their spring rates, but then how did someone get the 360/685 number?...

I fucking hate companies that do that. Makes me want to just forget about their product and go with TCKs – my thought was that the FCM stuff seemed alluring down the road, so I wouldn't have to buy dampers twice.

Interesting timing on this question. FCM just received my H&R coilover kit and measured the springs for me. Fronts are ~323 lbs/in and rears are ~445 lbs/in. This puts the bounce frequencies at 1.84Hz front and 1.64 Hz rear or as Shaikh put it "pitchville". Sorry H&R, cat's out of the bag...pun intended haha!

[r4dr]

I called H&R just to ask, they confirmed it's progressive. They also refused to disclose their spring rates, but then how did someone get the 360/685 number?...

I fucking hate companies that do that. Makes me want to just forget about their product and go with TCKs – my thought was that the FCM stuff seemed alluring down the road, so I wouldn't have to buy dampers twice.

[Obioban]

Springs are progressive though aren’t they?

If you have a moment, what’s the diameter of the front springs at the adjustment collar? Do they taper down to 2.5”?

I don't believe they're progressive.

They taper down to 60mm up front IIRC. I'm going to use a spacers or custom spring perch so I can run 2.5" springs.

[r4dr]

Springs are progressive though aren’t they?

If you have a moment, what’s the diameter of the front springs at the adjustment collar? Do they taper down to 2.5”?