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The Comprehensive DIY Suspension Tuning Guide
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Old 07-21-2009, 05:17 PM   #21
Tanger
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nice info:]
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Old 07-21-2009, 05:19 PM   #22
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nice info:]
Thanks for taking the time to search and read it!
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Old 07-23-2009, 12:50 PM   #23
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Mike at SPD USA has been in the business of improving Imprezas for a long time and I think some of the newer members would benefit from reading his articles. They can be found here- Suspension Area

(Thanks N2x4 for the link as SPD's site is down)

IMO: Mike's articles are great for getting your street car to a fun-to-drive platform. From there you can tweak things for your driving style.
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Old 07-24-2009, 01:46 PM   #24
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I've seen quite a bit of NASIOC hate here but their suspension FAQ is fantastic.

Spring/Strut/Coilover FAQ: Read if you are thinking of buying them! - NASIOC

Here are a few links I've picked out of it that are good reads.

First and foremost, the suspension Bible: Car Bibles : The Car Suspension Bible page 1 of 2

For the visual learners out there: HowStuffWorks "How Car Suspensions Work"

Once you've ventured in to coilover territory you should not only learn how to adjust them but why you should adjust them.

Corner balancing explained: Corner Balancing

If you're really jonesing for suspension information check your local book store for Fred Puhn's book "How To Make Your Car Handle" It's a fantastic read even though it's a bit dated.
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Old 07-27-2009, 11:08 AM   #25
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Another aspect of suspension that is often overlooked but is extremely important, especially in motorsport applications, is suspension travel. For our cars (Subarus) a general rule of thumb is "the more the better". Here is an extreme example of what happens when you add speed and really sticky rubber together from Turn In Concepts posted at NASIOC recently.



Yes, the corner curbing played a roll in this but lifting a tire or tires isn't uncommon with Mac Pherson strut suspensions that have modified sway bars, struts and springs.

*Balance is key.
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Old 08-21-2009, 10:07 AM   #26
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I've noticed that people often mix up different suspension arms and links, so here are two nice diagrams I borrowed from Rallispec.





There is a lot of good information here everyone. Thanks for contributing. However, we're going to need some organization here soon.
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Old 02-19-2010, 05:43 AM   #27
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+1
This thread is awesome. Thanks for the write up.
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Old 03-04-2010, 01:21 PM   #28
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Okay, so I've got a couple of suspension tuning questions.

1. What's the difference between adjusting camber using the adjustment bolt on the bottom of the strut and using adjustable tophats?
2. If I get adjustable tophats on my struts, will a regular alignment shop know what to do with them?
3. What's the difference between stock and STi lateral links (or ebay lateral links for that matter)?
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Old 03-04-2010, 01:48 PM   #29
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Originally Posted by mhj555 View Post
Okay, so I've got a couple of suspension tuning questions.

1. What's the difference between adjusting camber using the adjustment bolt on the bottom of the strut and using adjustable tophats?
top hats move the top of the strut in and out, you change the angle between your lower control arm (LCA) and your strut.

aside from changing static camber, you change dynamic because now the strut moves into the chassis at an angle rather than straight (slight exaggeration)

by using a bolt at the knuckle, you only change the angle between the strut and the knuckle, this does not affect dynamic camber.

if you draw this out on a piece of paper it may make more sense.

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2. If I get adjustable tophats on my struts, will a regular alignment shop know what to do with them?
they may or may not, depends on person doing your work, call ahead and ask.


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3. What's the difference between stock and STi lateral links (or ebay lateral links for that matter)?
depends on which year STi links, because there are a number of differences

GD links are 10mm longer than GC
GD STi links are aluminum vs steel
different sway bar mount design
STi comes with stiffer bushing, maybe even a spherical bearing, sometimes refered to as a pillow-ball. ALthough it depends which exactly you are talking about.. but a simple photo will make it rather clear.

alot of the e-bay links are adjustable.. which in my opinion is a fancy way of saying they are annoying. Your OEM setup is very simple, the front link has a solid adjustment, the rear link has an eliptical hole in the rear cross member which is used to adjust toe in a very minimal way.. and thats all you need, really.

some of these come with pillow-ball joints but i question the construction, in my opinion they are too cheap ($$) to be of proper quality.. but thats just my bias.

Last edited by Gooshin; 03-04-2010 at 02:05 PM..
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Old 07-05-2010, 09:23 PM   #30
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Hey guys got a quick question. im thinking of buying a DD but it has cusco front coilovers and rear tein coilovers is it ok to run 2 different types. Thanks a lot sorta a newb question hehe
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