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Old 12-13-2008, 10:57 PM   #1
BIGSKYWRX
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Default travel numbers for the 08/09 WRX dampers

been farting around w/ the oe dampers and figured I'd share what I found

front strut total stroke 169mm, rear shock total stroke 160mm
front bump stop 60mm, rear bump stop 78mm

my ride heights 385/375mm f/r (this is almost spot on w/ the factory spec)
at full droop 467/450mm f/r

this gives front droop at 82mm, rear droop 75mm
bump travel would be 87mm x MR (.966), 85mm x MR (? for now) rear- relatively balanced between bump/droop at oe height

you can see you have ~ inch of bump travel before engaging the stop in the front and not very much in the rear
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Old 12-13-2008, 11:12 PM   #2
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Quote:
Originally Posted by BIGSKYWRX View Post
you can see you have ~ 27mm of bump travel before engaging the stop in the front and only 7mm in the rear
YEP..and so when you see these spring companies doing a 1.5 drop you REALLY have to question how functional the springs are meant to be. Hence why we will only do a functional spring and NOT a lowering spring. Granted the oem rear stop is SUPER long. Its like a railroad car bumpstop !!

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Old 12-13-2008, 11:16 PM   #3
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Thanks BIGSKY, these are the numbers I've been waiting to hear. Sounds like this car is really crappy on any sort of lowering.
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Old 12-13-2008, 11:17 PM   #4
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One more reason to go straight to coilovers if you want to lower it.
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Old 12-13-2008, 11:19 PM   #5
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Old 12-14-2008, 12:36 AM   #6
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One more reason to go straight to coilovers if you want to lower it.
Wow, 3rd fail in 3 threads for this guy ^^^^^^
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Old 12-14-2008, 12:43 AM   #7
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Thanks BIGSKY, these are the numbers I've been waiting to hear. Sounds like this car is really crappy on any sort of lowering.
and will lead to NO END of idiot n00b threads and posts with
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Old 12-14-2008, 01:07 AM   #8
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Myles, when do you expect to have some springs out for us? I had your RCE's on Ohlins for my 06, and expect nothing bu the best. no pressure
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Old 12-14-2008, 01:29 AM   #9
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A quick search turned out disappointing. What are the stock numbers for total, droop, and bump travel on the 02-07 cars? Do the 08+'s have more or less travel than the older cars? From watching cars at RX, it looks like the newer cars have much more travel in the rear (or at least they use a lot more of it).
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Old 12-14-2008, 10:41 AM   #10
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the 02-07 WRX's had similar total stroke in the front 165mm, but 200mm (40mm more total stroke) in the rear (longer bump stops yet though 120mm on the 02,03 and 90mm on the 04+)

bump travel front was ~ 70mm (less than the 08/09) and ~ 115mm bump travel rear (more than the 08/09)
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Old 12-14-2008, 12:07 PM   #11
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Quote:
Originally Posted by BIGSKYWRX View Post
been farting around w/ the oe dampers and figured I'd share what I found

front strut total stroke 169mm, rear shock total stroke 160mm
front bump stop 60mm, rear bump stop 78mm

my ride heights 385/375mm f/r (this is almost spot on w/ the factory spec)
at full droop 467/450mm f/r

this gives front droop at 82mm, rear droop 75mm
bump travel would be 87mm front, 85mm rear- relatively balanced between bump/droop at oe height

you can see you have ~ 27mm of bump travel before engaging the stop in the front and only 7mm in the rear
Are you measuring just damper travel or wheel travel? Don't forget to account for the motion ratios.
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Old 12-14-2008, 12:29 PM   #12
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damper travel - which should equate very closely to wheel travel- w/ that little bump travel I don't see the wheel travel limited (ie hitting the fender liners)- the front bump stop does fully compress at 16mm so obviously no travel beyond that

how do these numbers compare w/ the 08 STi?

I'm assuming front motion ratio is very, very close to the same as the previosu gen (.966 is what I used on my 04), I didn't make measurements in the rear yet (should be length of lateral link (bolt to bolt)/inner lateral link bolt to ->lower shock mount bolt- squared)
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Old 12-14-2008, 05:52 PM   #13
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Originally Posted by BIGSKYWRX View Post
damper travel - which should equate very closely to wheel travel- w/ that little bump travel I don't see the wheel travel limited (ie hitting the fender liners)- the front bump stop does fully compress at 16mm so obviously no travel beyond that

how do these numbers compare w/ the 08 STi?

I'm assuming front motion ratio is very, very close to the same as the previosu gen (.966 is what I used on my 04), I didn't make measurements in the rear yet (should be length of lateral link (bolt to bolt)/inner lateral link bolt to ->lower shock mount bolt- squared)
The front MR is the same. Rear MR is very different. We used .8 for our 08 sti. I believe the WRX may be different due to the more narrow track. You'll need to confirm as we don't exactly have 08 or 09 WRX's flooding into the shop yet.

I have a thread in the GR section on iwsti with our measurements.
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Old 12-14-2008, 06:08 PM   #14
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sounds good I'm sure I'll be crawling under then again in the not so distant future
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Old 12-14-2008, 06:55 PM   #15
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We used .8 for our 08 sti.

.
Yep we got those #/s also.

The thread on IWSTI is the BIZZ-ZOMB. First time I read it, I treated it like watching a Blue Ray disc with pop corn and all !!! Very nice thread indeed. PRoblem is MANY people read it and come away with NOTHING because they just dont get it. They still want to slam an 08 and its like banging your head against the wall.

Myles
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Old 12-14-2008, 07:02 PM   #16
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I can has link to thready goodness?
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Old 12-14-2008, 07:16 PM   #17
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Old 12-14-2008, 07:41 PM   #18
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Old 12-14-2008, 08:18 PM   #19
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Hey you can go that link is included in my link

Man, the reading here is really telling me the rear suspension is less than ideal on these cars. So much for better than the GD design.
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Old 12-14-2008, 08:48 PM   #20
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I wouldn't read that much into it
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Old 12-14-2008, 08:58 PM   #21
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True. there is a ton of potential in the rear, but it sounds like it's gonna be pricey to figure out how to take advantage of it. I wonder if running RCA's in the rear would help.
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Old 12-14-2008, 09:34 PM   #22
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good read.. eager to see what changes the new sti's will have with the rear suspension. or how people will figure out how to control the dynamic toe changes without having to cost an arm and a leg.
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Old 12-14-2008, 10:29 PM   #23
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Quote:
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Yep we got those #/s also.

The thread on IWSTI is the BIZZ-ZOMB. First time I read it, I treated it like watching a Blue Ray disc with pop corn and all !!! Very nice thread indeed. PRoblem is MANY people read it and come away with NOTHING because they just dont get it. They still want to slam an 08 and its like banging your head against the wall.

Myles
Sadly, you're spot on with this. I just cannot get people to understand what is going on back there. I've hit a brick wall on the new chassis in trying to get people a) interested b) involved and c) understand.

Quote:
Originally Posted by Daishi00 View Post
Hey you can go that link is included in my link

Man, the reading here is really telling me the rear suspension is less than ideal on these cars. So much for better than the GD design.
In the stock form it's fine for 95% of us. Lower it with just springs, and the suckage increases a ton. yeah, I'll agree it looks good lowered, but there's more to it. Maybe I should make carbon fiber spats or covers to make the car LOOK lowered without having to actually lower it.

I will wholly admit that there is a TON of room for improvement. Problem is that there are no easy fixes for this nor will they be cheap. Seriously, there's just not a cheap way to "fix" a lot of things on this one.

Actually, now that we have the proto coilovers on we'll be taking the stockers down the road to Koni for a dyno and discuss some options on recovering some travel when lowering the car. Sadly, it won't happen until Jan. The dude who dyno's was out this week, then he has to prep all the dampers for the Koni challenge, then they shut down for a couple of weeks for inventory and such.

Quote:
Originally Posted by Daishi00 View Post
True. there is a ton of potential in the rear, but it sounds like it's gonna be pricey to figure out how to take advantage of it. I wonder if running RCA's in the rear would help.
Bingo on the pricey and potential.

We looked at an RCA type of setup for toe control, but you only have about 5mm of space in there due to clash with another arm at full range of motion. We have a VERY good idea on correcting it, but time and money are at a premium. Time because we just don't have much with all the 2.0's blowing in cincy lately. Money because the economy, well it sucks. We're in tight belt mode right now as are a number of other shops.
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Old 12-14-2008, 10:39 PM   #24
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the ICY/Phoenix's LGT competes in the Grand Am Series utilizing an almost identical rear setup- there's definitely potential there
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Old 12-14-2008, 11:03 PM   #25
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Wow, 5mm is all huh? So you'll have to do it on the other side of the arm, which looks like even more of a PITA I don't envy you guys at all.
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