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Old 05-05-2009, 02:46 PM   #1
A1337STI
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Default Struts for stock class (2005 STI)

Howdy!

I've been autocrossing for a few years now. I have an upgraded front sway bar 27-29, A Cat back (was cheap) and some Hoosiers (though a bit narrow) .

Well I'm still on my stock struts and they are starting to make a lot of noise. I'm looking for possible solutions and the only thing i know of that are stock legal are those Ohlin fixed perch struts for 2k

One thought i had was using the SPT Pink coil overs, taking them apart and re-using my stock springs. As long as the resulting alignment capabilities are the same, and the throw is +/- 1" they should be stock legal.

Anyone know if the stock springs would fit into those?

anyone have any other ideas that don't cost 2k ?
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Old 05-05-2009, 02:48 PM   #2
A1337STI
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http://content.subaru.com/mys/accessory/perf_parts.pdf

the inverted struts and springs kit that says it was made for an 05-07 Is what i'm thinking about. visually it looks like its using the big diameter style springs. The rule book also says ride height changes are okay as long as the spring perch is relatively in the same spot. (what ever that exactly means) ?
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Old 05-05-2009, 03:25 PM   #3
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Old 05-05-2009, 04:06 PM   #4
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+1 for konis

Having to replace your struts could also be the perfect excuse to mod the car and go to STU or BSP!
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Old 05-05-2009, 04:51 PM   #5
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As far as stock class shocks go I would either just stick with stock or get koni yellows with the rears revalved stiffer. Don't waste your mony on anything less. Also I think Vorshlag has a set of AST shocks for stock class on sale right now!

Quote:
Originally Posted by A1337STI View Post
The rule book also says ride height changes are okay as long as the spring perch is relatively in the same spot. (what ever that exactly means) ?
Ride height changes in stock class are NOT ok. The spring perch has to be in exactly the same spot as stock. You measure it 'relative' to the mounting points. The use of the word relative must have confused you...
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Old 05-05-2009, 04:56 PM   #6
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Correct me if I'm wrong, but I belive you'd be violating Konis warranty terms though as the "literature" doesn't say they fit on an 05 STi and they do require a copy of your car's title to do warranty work.

http://www.koni-na.com/warranty.cfm
http://www.koni-na.com/pdf/warranty.pdf
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Old 05-05-2009, 06:45 PM   #7
A1337STI
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Yes Cody you are correct i'de be violating Konis warranty right off the bat, and thus would have no warranty.

I sent an email to Vorlash motorsports

Really i'm hoping to find a damper solution for 1K or less.. maybe i should hit up a casino with $50 and assume my budget is 950 + winnings (if any )

Yes Davidss 13.5 .A.2-3 confused me :

It still seems does.

the wording of says what can not be altered, and it excludes ride height as "can not be altered"
But no where does it specifically say ride height can be altered. :

2: Suspension geometry and alignment capability, not including
ride height, may not be altered by the substitution of alternate
shock absorbers. This includes the position of the steering
arm attachment point in the case of struts with integrated
steering arms.

3: Adjustable spring perches are allowed, but the spring loadbearing
surface must be in the same location relative to the
shock mounting points as on the standard part. Shims may
be used to achieve compliance.

does that mean if my steering arm, and spring perch are in stock locations, and i'm on stock springs, but somehow due to the new damper my ride height is different, its okay?

Also is the tophat part of the mounting hardware or is it a suspension bushing?

13.5.B says i can change mounting hardware and 13.8.C says i can not change any suspension bushing
I've always assumed i have to use the stock top hats. is that correct?


thanks for the ideas and help btw
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Old 05-05-2009, 06:57 PM   #8
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Most of the noise comes from the rears. You can replace them with Tokico D specs or AGX's. Relatively cheap, no noises, comfy ride, and adjustable.
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Old 05-05-2009, 07:30 PM   #9
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^^

Ever try to find those for your 07 STi? He does have an '05...
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Old 05-05-2009, 07:54 PM   #10
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Koni.
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Old 05-05-2009, 08:08 PM   #11
dave bruener
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for autocross i don't think the D Specs are up to the job. They are fine for street but they do not work well for autocrossing. Yes I am talking from first hand experience.

I think Koni is the way to go
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Old 05-05-2009, 08:54 PM   #12
A1337STI
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Konis for $650 ish + install :| lots cheaper than Ohlins hmmm... if i could just find the subaru 4-way coilovers for cheap (like $1k ish) which should be technically be do-able considering how much the dealer markup is (over 100% on subaru parts?)
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Old 05-05-2009, 09:11 PM   #13
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REAR Sti struts are all the same bolt pattern.

Quote:
Originally Posted by Splash View Post
^^

Ever try to find those for your 07 STi? He does have an '05...
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Old 05-05-2009, 09:32 PM   #14
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As much as I like Koni, there's no direct application for the 05 - 07 STis. WRX struts will fit in the rear, so you can get a pair and gut them for (WRX) Konis. However, the fronts will need some custom work so this may not really be an option (see KC's link).

Alternatively, you could regrease the struts until you can afford the Ohlins or find a used set in the classifieds.
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Old 05-05-2009, 10:49 PM   #15
A1337STI
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This would work right?

http://forums.nasioc.com/forums/show...light=sti+pink

The 05 unit that is, (what the newer pictures are of) and if you looked at my above link (and scrolled down to the SPT STI inverted coil overs) you'll notice that the struts look ... identical . with the same 1,2,3,4 adjustment !

(too bad he sold those!)


Am i just an insane or is that like the same thing?

also anyone have any amazing deals / cheap Evenders for SPT Stuff? if i could get the usdm setup for like $1200 ish i could sell the springs and top hats and end up with what i want for 800-1000.

Saving up for the Ohlins is still an idea. but won't help me for the 09 Reno autoX series
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Old 05-05-2009, 10:52 PM   #16
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Quote:
Originally Posted by A1337STI View Post
does that mean if my steering arm, and spring perch are in stock locations, and i'm on stock springs, but somehow due to the new damper my ride height is different, its okay?

Also is the tophat part of the mounting hardware or is it a suspension bushing?

13.5.B says i can change mounting hardware and 13.8.C says i can not change any suspension bushing
I've always assumed i have to use the stock top hats. is that correct?

thanks for the ideas and help btw
Ok first off you do NOT have integrated steering arms so just forget any references to them.

Next let me make it simple: If you have a strut that has an adjustable perch you need to carefully measure a stock strut and set the perch on your new strut to EXACTLY the same height. BUT, the new strut may have more or less gass pressure in it which may affect the final ride height and that is OK. If you want to play with ride height you can have you shocks 'degassed' or have schrader vavles put in so you can adjust the gas pressure to fine tune the car.

A few notes: Lowering the car with degassing isn't automatically better. The nitrogen gas pressure adds spring rate and degassing doesn't affect the ride height much when you get moving. Many people always want to degass but now for many cars I think it's better to leave it alone or even overgass to add spring rate and change weight distribution.

In the end I wouldn't worry too much about degassing or nitrogen pressure at all especially if you're trying to spend a few hundred bucks. And please don't get anything cheaper than koni's. Personally I would get the vorshlag AST's.
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Old 05-05-2009, 11:01 PM   #17
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Quote:
Originally Posted by watchdoc View Post
REAR Sti struts are all the same bolt pattern.
So... You're saying he should use D-Specs or AGXs in the rear and something else up front? Not trying to be an a$$, I'm just not sure where you're going with this...
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Old 05-05-2009, 11:54 PM   #18
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Quote:
Originally Posted by Splash View Post
So... You're saying he should use D-Specs or AGXs in the rear and something else up front? Not trying to be an a$$, I'm just not sure where you're going with this...
Stock fronts with Dspec or AGX rears is an inexpensive solution since the clunking harsh bouncy ride is 95% due to the rear struts. The stock fronts actually work quite well at stock or slightly lowered ride heights. With that huge front bar, he's got plenty of front wheel rate. A pair of rear D specs including bump stops and spacers is less than $400. Comfy quiet ride that you can stiffen up for events. AGX's are about $100 cheaper but don't offer nearly as much adjustability. If you wanna spend a lil more, add Group N tophats. Sure, the "I gotta shave that last tenth of a second guys", are gonna say get the Konis but this setup works really well and makes the Sti much more liveable at the same time.

Yes, Koni's are nice but they're more expensive and don't exactly bolt on. You can install the rear D specs in less than an hour.

The original poster wanted a less expensive solution. This is the cheapest adjustable solution I'm aware of.

Last edited by watchdoc; 05-06-2009 at 12:25 AM.
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Old 05-06-2009, 01:06 AM   #19
A1337STI
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Thanks David Think i'll leave the gas alone in what ever struts i buy.

Are the D-specs inverted? or are we allowed to change to a non inverted in stock class? (and that's buying 04 WRX and using the rears only?)

are group n top hats Stock legal? (I thought no?)

Those sound like a good deal (assuming they are stock class legal)
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Old 05-06-2009, 07:37 PM   #20
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There are not really any good options for the 05-07 sti's other than Ohlins (which are above your budget), making some using Koni inserts (I looked into this and decided it was not worth the time spent), or those one off custom AST struts (on sale are $3k = out of budget - I considered them already long ago). I would, and have already picked up light used stock struts to replace the noisy originals. You have everything else you need, just get 275's r-comps and stick with that. The ohlins are nice, but not that much better than the stockers from experience.

It sucks, but our model just does not have many realistic/cheaper stock strut options. Probably why I have decided to move on to STU with coilovers myself.

Group N top hats are NOT legal.

Again, I would just get some much newer stock struts from a autocrossing standpoint.
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Old 05-06-2009, 07:48 PM   #21
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If, by noisy, you mean the infamous clunk, when you take the inverted inserts out of the housing you will see two teflon coated guides in the housing. There is normally grease packed in between those and under the 2nd guide. Most of that should be missing if it's clunking. Repacking the grease between them with a good stiff grease and reassembling will make them quiet again.

It's not permanent, but then, it's faster/easier than the work to fit Konis and should last long enough to save for Ohlins.
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Old 05-06-2009, 10:45 PM   #22
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So what about adding grease fittings to the stock struts to grease them easily? If it worked you could add grease without even jacking up the car...
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Old 05-06-2009, 11:27 PM   #23
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I know you have mentioned not wanting to get the Ohlins due to cost but I highly recommend them. I have been running them for the last 2 years and am very pleased with them. They can be adjusted to be very stiff for off the shelf struts. They made a great improvement on the car. I went through the same thing you are a couple of years ago and came to the conclusion that it was easier for me to just spend the extra money to get the Ohlins instead of getting Koni's and having to hack some struts. I priced some double adjustables and didn't want to spend that much money.
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Old 05-07-2009, 09:09 PM   #24
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take a peek @ the fixed perch Ohlins dyno's posted in the suspension forum, then peek at the 8610 Koni's

the installation of Koni's into the front STi strut isn't overly involved and has been done by numerous folks

the AST's that Vorshlag build are pretty nice (you do have to have a donor set ready to go under the knife however as they re-use the oe perches), but they are very spendy

there are also a couple of Koni authorized centers that will build you custom DA dampers as well (a little spendy as well)
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Old 05-08-2009, 12:55 AM   #25
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Hey Alex, this post is interesting as it's harsh on the Ohlins: http://forums.nasioc.com/forums/show...7&postcount=23

You should read that whole thread. It's a good read.
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