Coilover question: spring rates

loxxrider · Post by **loxxrider** » Fri Jun 05, 2015 5:47 am

Lol damn sorry that's what I meant haha. At least I had it right for the application at hand

Post by **EDIGREG** » Fri Jun 05, 2015 8:20 am

All true but progressive rate setups can be great for street cars. Just use a softer spring coupled with a stiff one, so that you have the effective combined rate for comfort under most driving scenarios, but when cornering, the softer spring is fully compressed/dead and only the stiff spring is utilized - best of both worlds.

mushasho · Post by **mushasho** » Fri Jun 05, 2015 8:35 am

EDIGREG wrote:All true but progressive rate setups can be great for street cars. Just use a softer spring coupled with a stiff one, so that you have the effective combined rate for comfort under most driving scenarios, but when cornering, the softer spring is fully compressed/dead and only the stiff spring is utilized - best of both worlds.

So in this example using a soft linear helper spring and an even firmer linear main spring would equal a progressive rate... ?

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loxxrider · Post by **loxxrider** » Fri Jun 05, 2015 8:44 am

Yeah, what ed said is exactly how you make it progressive.

mushasho · Post by **mushasho** » Fri Jun 05, 2015 5:57 pm

loxxrider wrote:Yeah, what ed said is exactly how you make it progressive.

So technically anyone who's used a linear 150lb tender spring in conjunction say linear 500lb main spring, effectively have something near an H&R Race spring... hmmm... which is compatible with a Bilstien Sport strut

Like these

loxxrider · Post by **loxxrider** » Fri Jun 05, 2015 9:41 pm

Yeah, but when the small spring is fully compressed, the 500 lb will kick in and work that strut hard. That's when it counts for strut wear, so you still need custom valving in my opinion.

paradox11235 · Post by **paradox11235** » Fri Jun 05, 2015 9:43 pm

Anyone not happy with their rates? I need another pair of used springs...

loxxrider · Post by **loxxrider** » Fri Jun 05, 2015 10:10 pm

Also, that spring rate would be 115 until the lower rate spring collapses.

Post by **EDIGREG** » Fri Jun 05, 2015 10:36 pm

The 150lb spring would never not be collapsed. I ran 250lb tender springs and they were fully compressed/dead under static vehicle weight. The advantage is that they soften the compression following a rebound event (ie hitting a pothole). They also serve as helper springs to prevent the primary springs from being unseated. If you want a truly progressive setup you're going to need a stiffer secondary spring.

ringbearer · Post by **ringbearer** » Fri Jun 05, 2015 11:22 pm

paradox11235 wrote:Anyone not happy with their rates? I need another pair of used springs...

I still have a pair of Eibach barrels in 380, PM me an offer if you want them.

mushasho · Post by **mushasho** » Fri Jun 05, 2015 11:33 pm

ringbearer wrote:
paradox11235 wrote:Anyone not happy with their rates? I need another pair of used springs...

I still have a pair of Eibach barrels in 380, PM me an offer if you want them.

If I match those with 550lb tenders... I know it'll be inverse, but...

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ringbearer · Post by **ringbearer** » Sat Jun 06, 2015 10:10 am

You want the softer spring to be the short one so that it will.compress and then you will.get the stiffer rate of the main spring.

loxxrider · Post by **loxxrider** » Sat Jun 06, 2015 4:13 pm

ringbearer wrote:You want the softer spring to be the short one so that it will.compress and then you will.get the stiffer rate of the main spring.

Yep

mushasho · Post by **mushasho** » Wed Jun 17, 2015 4:45 pm

So in keeping with the rate discussion...

Here we have a box...
a box full of different coil springs...

Using what we see here, what would be the optimal setup for the street? I already have a HAP Rear Sway Bar set on the softest setting in the rear...

Pick & Choose as You'd like...

Top are Eibach 250-550 tender springs
Bottom Left Eibach 8" 475lb
Bottom Right Eibach 7" 350lb

loxxrider · Post by **loxxrider** » Wed Jun 17, 2015 5:38 pm

So the tenders are progressive?

I think with those tenders you're going to need shorter main springs. I predict that that'd make for a setup that would absorb 1-2" bumps really nicely, then firm up on bumps bigger than that. The only downside would probably be a bit more body roll than you would have with straight main springs, but that could be alleviated with sway bars... That's just my initial guess at the situation without any kind of analysis or calculations.

mushasho · Post by **mushasho** » Wed Jun 17, 2015 5:41 pm

loxxrider wrote:So the tenders are progressive?

I think with those tenders you're going to need shorter main springs. I predict that that'd make for a setup that would absorb 1-2" bumps really nicely, then firm up on bumps bigger than that. The only downside would probably be a bit more body roll than you would have with straight main springs, but that could be alleviated with sway bars... That's just my initial guess at the situation without any kind of analysis or calculations.

How about just eliminate the tender all together... Straight single coil setup...
Which Up Front & Which Out back?

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loxxrider · Post by **loxxrider** » Wed Jun 17, 2015 6:04 pm

Longer and stronger out back

mushasho · Post by **mushasho** » Wed Jun 17, 2015 6:16 pm

loxxrider wrote:Longer and stronger out back

We just love oversteer huh...

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ringbearer · Post by **ringbearer** » Wed Jun 17, 2015 6:36 pm

How much room will you have around the gland nut? People have had rubbing issues.

Coilover question: spring rates

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