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Old 05-18-2009, 08:58 PM   #1
qualityracer
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Member#: 176016
Join Date: Mar 2008
Location: boston ma
Vehicle:
2002 2.5rs impreza
dark blue

Default 03 GR2 with 05 sti prodrive spring with 04 top hat

is the 05 sti prodrive spring's rate too agressive for the 03 gr2 shock?
i do not want my strut to blow too soon from aggressive spring, I know the 02-03 prodrive / swift sport spring would fit perfect. just wondering if
this set up gona be too bumpy or not.


I currently have 03 gr2 with 02 RS stock spring on, so comfy level on bumpy wise, how different?


thanks

also, where do you guys find those (match or not match) data? is there a formula or website? I tried KYB / prodrive website to get their spec, but can't find any...
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Last edited by qualityracer; 05-18-2009 at 10:11 PM.
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Old 05-20-2009, 06:35 AM   #2
indytruckboy
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Chapter/Region: MAIC
Location: Reading, PA
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Old 05-20-2009, 08:50 AM   #3
Scooby921
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Quote:
Originally Posted by qualityracer View Post
is the 05 sti prodrive spring's rate too agressive for the 03 gr2 shock?
i do not want my strut to blow too soon from aggressive spring, I know the 02-03 prodrive / swift sport spring would fit perfect. just wondering if
this set up gona be too bumpy or not.


I currently have 03 gr2 with 02 RS stock spring on, so comfy level on bumpy wise, how different?


thanks

also, where do you guys find those (match or not match) data? is there a formula or website? I tried KYB / prodrive website to get their spec, but can't find any...
Yes it'll be too stiff. If the vendor doesn't have spring rates listed you can usually find them at the manufacturer's website or around here on the forums. Link posted above is a table of known springs and rates. Very useful. The column about what struts they work with is just opinions from peoples' use. Some may like a strut spring combo more than others.

If people say your GR2 struts are 10% stiffer then I wouldn't go picking a spring that is more than 10-15% stiffer. Stock WRX springs are 160/120. That means you should look at springs in the 185/140 range, maybe a little higher.

That means your best options are:
Prodrive WRX spec
Swift WRX spec
Tein H-tech bugeye spec
Espelir ASD


As you increase spring stiffness you need a stiffer damper to control it. As you add a stiffer damper you begin to increase the vertical acceleration felt inside the car. You are reducing the amount the suspension compresses and rebounds over a given bump. You will feel more of the bumps and road imperfections. Without having test data to compare one setup to the next its hard to say how anything will compare to your stock setup or what you are running now.

I don't know of the RS spring rates are softer than WRX rates or by how much. I have a feeling that your GR2 dampers are the same ones designed/sold for the WRX. If RS springs are softer then you could very well be over-damped. The car isn't oscillating properly when you hit a bump and the shock you feel is much larger. It is entirely possible that you could improve ride quality just by switching to a set of stock WRX springs.
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