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Old 07-10-2013, 06:12 PM   #1
s2kvee
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Member#: 347511
Join Date: Feb 2013
Default Whats the best swift coilover spring rate for 11+ wrx

I'm currently on d2 coilovers for my 11 wrx (I did not buy them new, so please to do not flame, it came along with a used package deal that was too good to pass up) anyways, d2 coilover streets on 9k front and rear spring rates, for San Francisco (hills, bumps, potholes) these are a bit too stiff. I was thinking of swapping out the coilover springs with swifts at a different spring rate...

Anyone with input on which spring rate would work best for a daily driver, I'm not slammed or dunked or whatever... I'm simply lowered a bit, with the occasional circuit track days ...
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Old 07-10-2013, 09:26 PM   #2
jaboyd
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Chapter/Region: South East
Location: Knoxville, TN
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2011 STI
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Default

Not familiar with D2 but I'm running AMR coil-overs on my 2011 STI. I have and recommend Hypercoil springs. For a GR a good DD setup is 450# frt and 400# rears. This gives a nice and slightly frim ride on a 1" drop with good handling. If your roads are poor I might go a little softer with 425# frt and 375# rear. All of these are softer than the 9k you have.

Big question is the valving of your coil-overs. The springs should be matched to the valving for the best overall setup, so if you're valved for heavy springs they won't like light springs. Might want to contact mfr of your coils to determine best match.
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Old 07-12-2013, 12:18 AM   #3
s2kvee
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I may just match a set of the same specs tein springs.. Tein ride never failed me before so ill probably use teins spec as a blueprint... From what I've read tein ss-p models have spring rates of like 5-6k
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Old 07-12-2013, 08:08 AM   #4
Scooby921
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'13 JCW

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Quote:
Originally Posted by jaboyd View Post
Not familiar with D2 but I'm running AMR coil-overs on my 2011 STI. I have and recommend Hypercoil springs. For a GR a good DD setup is 450# frt and 400# rears. This gives a nice and slightly frim ride on a 1" drop with good handling. If your roads are poor I might go a little softer with 425# frt and 375# rear. All of these are softer than the 9k you have.

Big question is the valving of your coil-overs. The springs should be matched to the valving for the best overall setup, so if you're valved for heavy springs they won't like light springs. Might want to contact mfr of your coils to determine best match.
This is important. While stiff springs contribute a lot to a stiff ride you will gain very little by putting a soft spring on a damper that still maintains high compression and rebound damping.


Quote:
Originally Posted by s2kvee View Post
I may just match a set of the same specs tein springs.. Tein ride never failed me before so ill probably use teins spec as a blueprint... From what I've read tein ss-p models have spring rates of like 5-6k
If Tein has never failed you then you don't really live where roads are rough. Tein, along with most coilovers designed and manufactured in Asia, are valved and sprung very stiff. The roads in Japan are much smoother than most roads in the US. They don't worry much about pot holes and can take advantage of performance benefits with stiffer springs and damping. It's possible that you can get away using a much stiffer spring than the rest of us, so recommendations will likely be all over the place.




When it comes to aftermarket coilover springs Swift, Eibach, Hyperco, and H&R are all relatively equal. I did some testing many years ago and found that Hyperco and Swift are a bit lighter and maintain a longer linear range. They also tend to cost a bit more than others. For what it's worth, the last time I bought new coilover springs for a vehicle I went with H&R because they offered exactly what length and rate I wanted at the lowest cost. For what we do with a daily driver you aren't going to notice the difference between the top brands.
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