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2005+ Ford Mustang v6 4.0L Tech Technical discussion about the 2005+ Ford Mustang 4.0L v6

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Old 05-11-2017, 11:06 AM   #1
Benwhite911
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Default Shooting From The Hip: Rear Spring Rate

I've been monkey'ing around with the suspension on my 05 V6 now for about 2 years. I originally started because the shocks and struts were shot and needed replacing. So I looking into lowing the car, and that's where my interest took off. Now I'm going to jump ahead to my current set up and then ask my question.

Shocks Struts: Strange Engineering 10 Way Adjustable
Front Springs: H&R Super Sport Springs
Rear Springs: No Name Generic
Front Swaybar: 35mm Granatelli
Rear Swaybar: 25mm Granatelli
Upgraded Control Arms both Front and Rear.

So here is what I'm looking to do. I bought the Steeda Rear Ride Height Adjuster Kit and I want to install a set of rear coilover springs. The rate I'm toying around with is 400 lb rate. Does this sound link an awesome or an absurd idea?
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Old 05-11-2017, 01:50 PM   #2
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400# in the rear is a lot especially with your sway bar size. I imagine you will need huge rear tires to support the extra wheel rate. I would choose the tire compound & size you're going to run and set up the car around the tires. A properly setup suspension and brakes can easily overpower most street tires so there's no point in building those components if the tires aren't up to the task.

FWIW I have a 335lb spring waiting to be installed and Vorshlag (among other track junkies) didn't recommend going higher for a street car. I am still on the 21mm (or is it 19?) stock swaybar in the rear.
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Last edited by 46addict; 05-11-2017 at 01:54 PM.
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Old 05-11-2017, 01:53 PM   #3
Benwhite911
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Thanks for your insight. I wouldn't mind getting rid of the rear swaybar. I never noticed a change when I installed it.
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Old 05-12-2017, 02:45 AM   #4
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Quote:
Originally Posted by Benwhite911 View Post
Thanks for your insight. I wouldn't mind getting rid of the rear swaybar. I never noticed a change when I installed it.
Most V6's came without a rear sway. I could tell a little difference without it. Not sure how it would feel without both the front and rear sways; would it be dangerous on the street?
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Old 05-12-2017, 08:13 AM   #5
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Originally Posted by TexasBlownV8 View Post
Most V6's came without a rear sway. I could tell a little difference without it. Not sure how it would feel without both the front and rear sways; would it be dangerous on the street?
But what about the 400 lb rate rear springs? What is your opinion on that?
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Old 05-12-2017, 10:01 AM   #6
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i've got BC Racing coils on my car, they come with 7k front and 5k rear, which converts to 392# front and 280# rear.
Had an 8k in the rear for awhile, which is 448#, it was SUPER stiff, I felt every single bump, crack and divot in the road. Put the 5k back in there and it's tolerable.
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