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Old 01-08-2022, 10:30 AM   #1
RoyL
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QA1 Coilovers Spring Rate 650-750-850?

Coil over Spring Rates Discussed in this YouTube Video, says 750 lb is the most used [starts ~2:45]... What have you guys installed in your C10s?

https://www.youtube.com/watch?v=foX1...JClassicTrucks

My Suburban has no engine, fenders, etc., so can't do any weighing. It's been X-member swapped from a 73-87 C10 and have 2" drop spindles for disc brakes and 1" drop front coils. 4" drop coils in the rear. Had a 350 sbc/TH350 trans, planning on a 5.3/6.0 swap with 4L60/80.

POL Coilovers [Aldan American] state their spring rates are:

Small Block Spring Rate = 450#, Big Block Spring Rate = 550#

https://www.performanceonline.com/19...n-kit-stage-3/

RideTech Coilover springs appear to be P/N - 59080800 Coilspring 8” 800lb
https://www.ridetech.com/instructions/11360201_WEB.pdf
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Last edited by RoyL; 01-08-2022 at 10:38 AM.
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Old 01-09-2022, 01:42 AM   #2
SCOTI
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Re: QA1 Coilovers Spring Rate 650-750-850?

Quote:
Originally Posted by RoyL View Post
Coil over Spring Rates Discussed in this YouTube Video, says 750 lb is the most used [starts ~2:45]... What have you guys installed in your C10s?

https://www.youtube.com/watch?v=foX1...JClassicTrucks

My Suburban has no engine, fenders, etc., so can't do any weighing. It's been X-member swapped from a 73-87 C10 and have 2" drop spindles for disc brakes and 1" drop front coils. 4" drop coils in the rear. Had a 350 sbc/TH350 trans, planning on a 5.3/6.0 swap with 4L60/80.

POL Coilovers [Aldan American] state their spring rates are:

Small Block Spring Rate = 450#, Big Block Spring Rate = 550#

https://www.performanceonline.com/19...n-kit-stage-3/

RideTech Coilover springs appear to be P/N - 59080800 Coilspring 8” 800lb
https://www.ridetech.com/instructions/11360201_WEB.pdf
You need to do calculations for the combo to get your target spring rate for starting.

The weight of the front components, suspension pivot point dimensions, & shock angle are some of the things you need to have an idea of to get started. Ridetech has an index w/various component combos to help narrow starting spring-rate choices.

It's definitely not a 'one size fits all' answer so even if you have a similar combo as another guys, the ride quality interpretation is subjective & you may want more/less spring rate vs. what they have.
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Old 01-09-2022, 02:04 AM   #3
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Re: QA1 Coilovers Spring Rate 650-750-850?

My '77 daily driver C10 has Moog 6454 1-ton coil springs, which are rated at 1060lbs/in. They are perfectly fine. But ride quality IS subjective.

I would not go softer. I'm also running "Big 10" leafs in the back as well.
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Old 01-09-2022, 10:22 PM   #4
RoyL
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Re: QA1 Coilovers Spring Rate 650-750-850?

Quote:
Originally Posted by SCOTI View Post
You need to do calculations for the combo to get your target spring rate for starting.

The weight of the front components, suspension pivot point dimensions, & shock angle are some of the things you need to have an idea of to get started. Ridetech has an index w/various component combos to help narrow starting spring-rate choices.

It's definitely not a 'one size fits all' answer so even if you have a similar combo as another guys, the ride quality interpretation is subjective & you may want more/less spring rate vs. what they have.
Thx, understand. I do need to know the basics of my vehicle... still want to know what others have used and their experience with them.


Yes, looks like Ridetech has a nice link to vehicle weights and A and B dimensions on their calculator. https://www.ridetech.com/tech/vehicle-weights/
Suburban is spelled 'Surburban' if you search. Says typical weight with a V8 and 700R4 is 4,500, front weight is 2,280. Used their A-arm data for dimension A and B (10.94" and 16.94"), some trial and error with the angle and spring stroke and spring length.

Guesstimate using the Ridetech coils [73-87 coilover kit includes this spring: 59080800, Coilspring, 8”, 800lb] which results in ~700 lb for a cruiser/daily driver.

If I use QA1's 10" coil, 1OHTXXX, SPRING, 1O" HIGH TRAVEL 2-1/2" ID, results are ~550 lb
I'll have to get QA1's A/B dimensions to be apples to apples, I guess.
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