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Old 12-16-2007, 03:56 PM   #1
ButtDyno
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Default The STi Strut FAQ

This is meant to be a fairly short FAQ devoted to all the wacky quirks of the STi struts in all their forms.

I have some red struts in front of me. Which ones do I have?

The paint codes on the spring should help identify them.
http://forums.nasioc.com/forums/show...ruts+dots+spec

I want to put STi struts on my car. Will they fit?

Check out the "Will this suspension part fit my car?" thread:
http://forums.nasioc.com/forums/show....php?t=1303381

Short version: The 05+ STi's have different hubs, and the mounting points on the front struts are different. 05-07 front STi struts won't fit any other car (the rears did not change) because when the 2005 STi got the new 5x114.3 hubs the bolt locations changed. The rest of the details are covered in the thread including what you have to do to make 02-03 stuff fit 04+ stuff and vice versa.

My STi struts are making a clunking noise. I think it's in the rear. What gives?

There are many threads about the STi strut clunk. This is the most famous:
http://forums.nasioc.com/forums/show...ighlight=strut

Is the clunk of doom dangerous? Will it affect my car's handling?

There is no definite answer. The strut may be sticking, which may be affecting the car's performance. (This link is okay, but I'm always looking for a better one.)
http://forums.nasioc.com/forums/show...clunk+stiction

What can I do to fix the clunk?

Greasing them can help make the symptoms go away. This thread discusses it:
http://forums.nasioc.com/forums/show....php?t=1362104

So does this one:
http://forums.nasioc.com/forums/show....php?t=1415706

What springs should I put on my STi struts?

Start here:
http://forums.nasioc.com/forums/show....php?t=1383366

It discusses a lot of the issues related to the STi struts and MacPherson struts in general. The short version is - a lot of the lowering springs out there are too low.

How stiff a spring can I put on the STi struts?

*waiting for a better answer to this question
I know someone local who ran 325/300 lb/in Ground Controls on his STi and liked it as an autox setup. I'm not sure what the upper limit is but it's probably something in that range.

Can I put Koni WRX inserts in my 2004 STi struts?

Maybe (see below) but your best bet is to just pick up some WRX housings since they will definitely fit, and those housings will definitely fit your car.

Can I put Koni WRX inserts in my 2005-2007 STi struts?

Mojambo and jamesohoh7 hav experimented with this. The short answer is "probably but there's some work involved":
http://forums.nasioc.com/forums/show....php?t=1276865
More here:
http://www.iwsti.com/forums/suspensi...t-housing.html
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Last edited by ButtDyno; 01-08-2008 at 04:17 PM.
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Old 12-16-2007, 03:56 PM   #2
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Default

expansion 1. Feedback appreciated, this isn't remotely comprehensive

Last edited by ButtDyno; 12-16-2007 at 04:01 PM.
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Old 12-16-2007, 03:56 PM   #3
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expansion 2
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Old 12-16-2007, 04:30 PM   #4
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Wow someone's bored today. And why do we even need this you should just get coilovers.

kidding. Anyway, might not be a bad idea to just say flat out that 05-07 STi struts do not fit any other car.
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Old 12-29-2007, 01:13 PM   #5
ButtDyno
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Old 12-29-2007, 07:57 PM   #6
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I like the "how to make the STi strut work w/ Koni insert thread"- particularly handy for 05+ guys that can't use WRX strut housings
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Old 12-29-2007, 08:04 PM   #7
ButtDyno
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Quote:
Originally Posted by BIGSKYWRX View Post
I like the "how to make the STi strut work w/ Koni insert thread"- particularly handy for 05+ guys that can't use WRX strut housings
Good suggestion - added
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Old 01-07-2008, 01:36 PM   #8
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Also, you should clarify that only the fronts aren't compatible from 05-07. The rears didn't change.
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Old 01-07-2008, 02:54 PM   #9
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^ and include your talking STi to WRX
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Old 01-08-2008, 04:17 PM   #10
ButtDyno
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Edited first post. Does that look okay?
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Old 01-08-2008, 11:04 PM   #11
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looks good, maybe a short discussion on inverted vs non-inverted, not many cars come w/ inverted struts
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Old 01-08-2008, 11:46 PM   #12
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still confused dyno! im looking into possible v7's on my 2002 wagon
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Old 01-09-2008, 08:28 AM   #13
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Quote:
Originally Posted by jdubya301 View Post
still confused dyno! im looking into possible v7's on my 2002 wagon
That's largely a bolt on, but you'll need to do something to help correct the front camber since sedan struts on a wagon == camber challenged. The usual, cheap solution is... an extra camber bolt (Whiteline makes some) in the lower clevis bolt hole on each front strut. Camber plates are probably a better, but more pricey solution. A friend of mine did both when he had a V7 STi strut setup on his wagon.
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Old 02-06-2008, 10:40 AM   #14
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Fantastic thread as are all of these suspension threads.

How stiff a spring can I put on the STi struts?

*waiting for a better answer to this question
I know someone local who ran 325/300 lb/in Ground Controls on his STi and liked it as an autox setup. I'm not sure what the upper limit is but it's probably something in that range.

This is a question that could use a lot of focus for those on a budget. I bought Pete's set up you mentioned above and will use it on my 04 STi this season along with the GC camber/caster plates. I'm sure we'll cross paths at some point since I like to hit the Frederick CDC events and Cumberland events. So I'll work on a second opinion. Pete seemed very pleased, but then again he had to sell them
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Old 02-06-2008, 10:59 AM   #15
ButtDyno
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I think that Tom Hoppe spec'd em originally, so it must have been based on data. He's pretty good at that sorta thing
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Old 03-31-2008, 11:07 AM   #16
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Quote:
Originally Posted by jamal View Post
Wow someone's bored today. And why do we even need this you should just get coilovers.

kidding. Anyway, might not be a bad idea to just say flat out that 05-07 STi struts do not fit any other car.
but with work they might tom at kartboy has quoted on this section
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Old 01-16-2009, 01:55 PM   #17
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can you use stock wrx top hats with sti struts?
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Old 01-16-2009, 03:07 PM   #18
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stock WRX tops (front and rear) = stock STi tops from 04-07- same part #'s
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Old 01-16-2009, 03:17 PM   #19
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Quote:
Originally Posted by BIGSKYWRX View Post
stock WRX tops (front and rear) = stock STi tops from 04-07- same part #'s
thanks!
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Old 12-31-2009, 10:43 AM   #20
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So, anything here that we should add for the 08-09 cars? Anyone have a good link about the new suspension (and how little travel it has) to include here?
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Old 12-31-2009, 02:38 PM   #21
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the front has almost identical travel (still strut based) to previous gens, the rear does have less (shock based w/ the double wishbone)

iwsti had a thread that went into some detail on the rear configuration
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Old 09-18-2010, 11:14 PM   #22
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has anyone written/figured out the 1 inch mystery drop?
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Old 06-23-2011, 01:21 PM   #23
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anyone know if its possible to swap 09-10 STI struts into a 08 WRX. Im looking for a stiffer lower ride.
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Old 06-23-2011, 03:13 PM   #24
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not possible (not w/o a lot of complex machining anyways ) ever since the STi (in 05) went to the thicker knuckle the front struts have been a no go for WRX guys

the rear shocks MAY possibly fit, but I don't what that would gain you- and not even certain if they will

I'd say Bilstein or Koni are going to be your best bet, don't bother w/ the 09-11 WRX struts/shocks- they are only mildly firmer than the 08 ones
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Old 01-09-2012, 11:33 PM   #25
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Default Bottom STi Strut Mount Thickness??

Hi everyone, I have an 06 STi and am having some [COLOR=blue !important][FONT=verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif][COLOR=blue !important][FONT=verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif]coilover[/font][/font][/color][/color] fitment issues. The bottom [COLOR=blue !important][FONT=verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif][COLOR=blue !important][FONT=verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif]strut[/font][/font][/color][/color] mount on my STi is 1 7/16" wide and the stock strut is 1 1/2" so stock fits perfect, however on the coilovers the opening is only 1 1/8" wide therefor the strut wont fit onto the bottom mount....do I have the wrong coilovers or has my suspension been changed? what is the factory width on your guys stock struts bottom mount? im confused haha

Thanks
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