H&R Race spring rates

[craz azn]

How do you measure spring rates on a progressive spring? I know the advertised number that floats around the forum is 315~ or so... is this measured at like 1" of compression or something?

[whiltebeitel]

H&R race is 315 lbs/in front, 570 lbs/in rear.

[JGood]

How do you measure spring rates on a progressive spring? I know the advertised number that floats around the forum is 315~ or so... is this measured at like 1" of compression or something?

I think progressive springs rates are advertised in a range or as a static number. I've seen lbs/in ranges for Turner J-stocks, but everything else I've only seen static numbers.

It seems to be common belief that H&R's, Eibach, etc... are all static, but I believe they are indeed progressive.

So I'm not sure how they are measured, or if a standard even exists. Maybe H&R measures from 1-2 inches of compression and Eibach measures from 3-4? Wouldn't that just throw a curve ball at picking out springs...

[craz azn]

I think progressive springs rates are advertised in a range or as a static number. I've seen lbs/in ranges for Turner J-stocks, but everything else I've only seen static numbers.

It seems to be common belief that H&R's, Eibach, etc... are all static, but I believe they are indeed progressive.

So I'm not sure how they are measured, or if a standard even exists. Maybe H&R measures from 1-2 inches of compression and Eibach measures from 3-4? Wouldn't that just throw a curve ball at picking out springs...

Thanks for the comment, definitely some food for thought... :D

BTW, here is some more food for thought. Remember everyone saying the top coil on H&R Race is dead? Haha. Try again, I surely won't call it a dead coil...

[Philo]

What happened? Oh, and post some more shots of the red E30 on euroweaves. Looks clean :up:

[reelizmpro]

Ok, so why wouldn't u call it a dead coil? enlighten us. Do the top coils not bind when compressed by the weight of the car?

[craz azn]

What happened? Oh, and post some more shots of the red E30 on euroweaves. Looks clean :up:

Thanks. I took a quicky cell phone shot. Excuse the car, its mad dirty from the track and dust. Only the rims are clean :p

New 'stance' I guess, H&R Race front springs, one top coil chopped; H&R Grp G 100 rear springs. Undersized R Compound Toyos.

Ok, so why wouldn't u call it a dead coil? enlighten us. Do the top coils not bind when compressed by the weight of the car?

I didn't pay attention to the coils and whatnot as I was more intrigued with the spring rate. Everyone blabbers on about cutting progressive springs saying it won't affect it, but it surely did when I tried.

[Wh33lhop]

I think progressive springs rates are advertised in a range or as a static number. I've seen lbs/in ranges for Turner J-stocks, but everything else I've only seen static numbers.

It seems to be common belief that H&R's, Eibach, etc... are all static, but I believe they are indeed progressive.

So I'm not sure how they are measured, or if a standard even exists. Maybe H&R measures from 1-2 inches of compression and Eibach measures from 3-4? Wouldn't that just throw a curve ball at picking out springs...

I would not call the spring rate static, as it is not. No spring rate is truly static, they are all dynamic.

Linear rate springs is a better term I think, as they are DESIGNED to have a static rate more or less, whereas progressive springs ramp the rates up as they are further compressed. Someone needs to get access to a damn spring dyno and put all these springs to test.

[Wh33lhop]

Thanks. I took a quicky cell phone shot. Excuse the car, its mad dirty from the track and dust. Only the rims are clean :p

New 'stance' I guess, H&R Race front springs, one top coil chopped; H&R Grp G 100 rear springs. Undersized R Compound Toyos.





I didn't pay attention to the coils and whatnot as I was more intrigued with the spring rate. Everyone blabbers on about cutting progressive springs saying it won't affect it, but it surely did when I tried.

Saying it won't affect what, the rate? Your car will sit lower and for the most part have a similar spring rate, which also means the rate won't ramp up as early as it is designed to and you will be smacking the bump stops more.

Of course, you probably figured that out by now. ;)

[craz azn]

Saying it won't affect what, the rate? Your car will sit lower and for the most part have a similar spring rate, which also means the rate won't ramp up as early as it is designed to and you will be smacking the bump stops more.

Of course, you probably figured that out by now. ;)

Umm... actually more the opposite. Its quite a bit stiffer now than it used to be untouched. I would say the rate ramps up much faster now (also verified by a spring tester). Also, I took it on the track this past Friday at Mosport, and I didn't feel it bottom out... I was disappointed though because the car didn't feel as tail-happy as it used to be last year with my previous suspension setup (probably due to the now fairly highish spring rate).

[JGood]

I would not call the spring rate static, as it is not. No spring rate is truly static, they are all dynamic.

Linear rate springs is a better term I think, as they are DESIGNED to have a static rate more or less, whereas progressive springs ramp the rates up as they are further compressed. Someone needs to get access to a damn spring dyno and put all these springs to test.

Yes, I meant linear, not static. When I wrote that, I was multi-tasking at work, trying to diagnose DS3 failures and whatnot