SteveW
Well-Known Member
- Joined
- Jun 3, 2015
- Threads
- 8
- Messages
- 700
- Reaction score
- 271
- Location
- Columbia Gorge area
- Vehicle(s)
- 2015 Mustang GT PP
- Thread starter
- #1
Hey guys, thought I'd share something I'm MacGyvering into my setup.
I'm running my car in CAMC this year and if you look at wheel rates and/or hz of typical national level ST setups none of the common aftermarket springs available for this car are anywhere close the rates people run on other cars at the pointy end of the classes. I don't have a shock package right now that is setup to run a true coilover rear where you could run 2.25" race springs and get to the rates I think we'd need to be at, so did some google-foo on springs that might work in the OEM location of the rear control arms and found this Hyperco spring.
It's a 1440 lb-in, 5.5"OD x 9.5" long spring ground on one end, open coil on the other. I figure that rate gets me in the 2.08ish hz range with about double the wheel rate of a GT PP. I'm pairing it with a 350 lb-in 60mm spring on my front struts although, I had been running a 450 lb-in spring. A 350 lb front spring gets me around 1.97ish hz and about double the GT PP front wheel rate too. So, balanced with the rear according to book theory.
The rear springs on my Roush kit are somewhere in the 950 lb-in range and the car rode like crap paired with the 450 lb front springs. This combo also doesn't appear to be working good as an autox setup so far this year.
Anyway enough jabbering on about that stuff. So far, I've just installed them and they fit in there like they were made for the car. No slack at full droop with the shocks hooked up and rode fine on a short around the block test before calling it an evening. I'll drive the car to work tomorrow and get a few miles on that way.
If you have an adjustable perch for the OEM rear location you could probably make these springs work. Hyperco also has a whole pile of rates in this size spring although, 1440 is the stiffest. 1440 is the stiffest spring I found that seemed like it would fit on the car in the OEM location.
Thought I'd share what I was up to :ford:
I'm running my car in CAMC this year and if you look at wheel rates and/or hz of typical national level ST setups none of the common aftermarket springs available for this car are anywhere close the rates people run on other cars at the pointy end of the classes. I don't have a shock package right now that is setup to run a true coilover rear where you could run 2.25" race springs and get to the rates I think we'd need to be at, so did some google-foo on springs that might work in the OEM location of the rear control arms and found this Hyperco spring.
It's a 1440 lb-in, 5.5"OD x 9.5" long spring ground on one end, open coil on the other. I figure that rate gets me in the 2.08ish hz range with about double the wheel rate of a GT PP. I'm pairing it with a 350 lb-in 60mm spring on my front struts although, I had been running a 450 lb-in spring. A 350 lb front spring gets me around 1.97ish hz and about double the GT PP front wheel rate too. So, balanced with the rear according to book theory.
The rear springs on my Roush kit are somewhere in the 950 lb-in range and the car rode like crap paired with the 450 lb front springs. This combo also doesn't appear to be working good as an autox setup so far this year.
Anyway enough jabbering on about that stuff. So far, I've just installed them and they fit in there like they were made for the car. No slack at full droop with the shocks hooked up and rode fine on a short around the block test before calling it an evening. I'll drive the car to work tomorrow and get a few miles on that way.
If you have an adjustable perch for the OEM rear location you could probably make these springs work. Hyperco also has a whole pile of rates in this size spring although, 1440 is the stiffest. 1440 is the stiffest spring I found that seemed like it would fit on the car in the OEM location.
Thought I'd share what I was up to :ford:
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