Rear Coilover Spring Rate Help

CMcAllister · 05-28-2021, 10:16 PM

For any situation, there will be 3 or more spring rates which will support the car at the desired ride height with the shock at the the desired center to center (which should be maintained). This will have the different rate springs compressed to different heights. Compressing a spring stores energy which makes the suspension more "lively".

Heavy springs compressed a little will react differently than light springs compressed more. Which you use depends on many things in your combination and personal preference. Lighter springs will usually require better shocks to control the housing, especially with ladder bars, certain 4 link settings and/or higher power levels, allowing you to tune it accordingly.

Marty's recommendation of 125# on that 14" spring (I assume) and the Santhuffs is likely spot on.

Mike Rietow · 05-30-2021, 03:10 AM

I bought a set of D/A Koni's Bickle valved in the late 90's. He suggested a 175 on this all steel Nova.

If you look at his spring recommendations in one of his catalogs, 1500-1800 rear weight he suggests a 175.

I did put a 125 spring on this to run some local 370 Pro Tree races. It did work for the fast tree, however it acted more so than previously, like it needed a ARB. Ladder bar sbc 10x28 bias, 3200 lbs.

Eibach or PAC coilover springs are the good ones, if you can find PAC, they've stopped producing , coil springs.

I just bolted a set of PAC 165 on this, i bought and made one hit on in 2017, went 1.28 60ft last car down on a Thursday night test n Tune prep n/a sbc. 1550 lbs on back tires.

Not criticizing anyone's suggestions here, just stating my experience, light vs heavy spring.

CMcAllister · 05-31-2021, 01:05 AM

OP stated he was using a 19" shock. I made some assumptions from that as far as shock travel, installed length at ride height, spring free length and compressed length at ride height, etc. All of which make a difference.

MROD7007 · 06-01-2021, 01:29 PM

Mike Rietow

Give me a call when you gat a chance. I would like to discuss further.

Mark
210-392-9902

05-28-2021, 10:16 PM	#1
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 614 Likes: 16 Liked 920 Times in 259 Posts	Re: Rear Coilover Spring Rate Help For any situation, there will be 3 or more spring rates which will support the car at the desired ride height with the shock at the the desired center to center (which should be maintained). This will have the different rate springs compressed to different heights. Compressing a spring stores energy which makes the suspension more "lively". Heavy springs compressed a little will react differently than light springs compressed more. Which you use depends on many things in your combination and personal preference. Lighter springs will usually require better shocks to control the housing, especially with ladder bars, certain 4 link settings and/or higher power levels, allowing you to tune it accordingly. Marty's recommendation of 125# on that 14" spring (I assume) and the Santhuffs is likely spot on.

05-30-2021, 03:10 AM	#2
Mike Rietow Junior Member Join Date: Apr 2017 Posts: 93 Likes: 19 Liked 30 Times in 16 Posts	Re: Rear Coilover Spring Rate Help I bought a set of D/A Koni's Bickle valved in the late 90's. He suggested a 175 on this all steel Nova. If you look at his spring recommendations in one of his catalogs, 1500-1800 rear weight he suggests a 175. I did put a 125 spring on this to run some local 370 Pro Tree races. It did work for the fast tree, however it acted more so than previously, like it needed a ARB. Ladder bar sbc 10x28 bias, 3200 lbs. Eibach or PAC coilover springs are the good ones, if you can find PAC, they've stopped producing , coil springs. I just bolted a set of PAC 165 on this, i bought and made one hit on in 2017, went 1.28 60ft last car down on a Thursday night test n Tune prep n/a sbc. 1550 lbs on back tires. Not criticizing anyone's suggestions here, just stating my experience, light vs heavy spring. __________________ 7x S/Pro 'Sunshine" http://ottm.store https://youtu.be/I8QWEaqeFRw

05-31-2021, 01:05 AM	#3
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 614 Likes: 16 Liked 920 Times in 259 Posts	Re: Rear Coilover Spring Rate Help OP stated he was using a 19" shock. I made some assumptions from that as far as shock travel, installed length at ride height, spring free length and compressed length at ride height, etc. All of which make a difference.

06-01-2021, 01:29 PM	#4
MROD7007 Junior Member Join Date: Jul 2018 Posts: 9 Likes: 1 Liked 1 Time in 1 Post	Re: Rear Coilover Spring Rate Help Mike Rietow Give me a call when you gat a chance. I would like to discuss further. Mark 210-392-9902