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Old 09-21-2009, 05:23 AM   #1
speedyHAM
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Join Date: Nov 2003
Chapter/Region: MWSOC
Location: "They eat fish soaked in lye"
Vehicle:
1996 Gutted, built
XP class Impreza L

Default GC/ GM suspension setups

So I'm wondering what everyone else runs for suspension setups on the GC/ GM chassis cars that autoX in classes that allow suspension changes.

I'll start.

XP class

600# front and rear springs on Koni yellows in stock housings
22mm front bar
No rear bar
0 toe all around
-3.1 camber front
-1.5 camber rear

Based on tire temperatures it looks like I need less front camber next year. Based off pictures during hard cornering I think I need to increase the roll stiffness. I am thinking about going to a 25 or 27mm front bar and a 13 or 18mm rear bar with -2.7 front camber and 500# rear springs.

Thoughts and suggestions are welcome.
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Old 09-21-2009, 06:49 AM   #2
Storm
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Class: FSP

600F / 450R springs
no bars
Single adjustable D2 coilovers
-3.5 front, 1/8-1/4" toe out
-0.5 rear, 0 toe

Based on tire temps and wear, I need to get rid of the toe out up front and add a little more front roll stiffnes. I'm scrubbing the inside fronts more than I'd like and seem to be overheating them. I like the way the rear stays planted when the front doesn't roll over too far. It's transition from grip to slip is predictable, but the car must be driven hard to get the most from it. We used to run with no toe up front and were still happy with turn-in, but loved the longer wear. Rideheight changes have messed with the toe and I just hadn't gotten back on the rack to zero it out. Me= lazyass.


Jay Storm
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Old 09-21-2009, 09:49 PM   #3
recnelis
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2000 Impreza 2.5RS
#74 ST - RCE Tarmac 2

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Class: ST

500 lb/in front, 450 lb/in rear - RCE T2s
22 mm FSB, 22 mm RSB
-3.2* front, 0 toe
-1.5* rear, 0 tie

My front tires are still rolling over a bit too much, so I have an Addco bar I want to try out at some point. I also need to do something about the RSB though, it rubs on the gas filler neck if I put it on full stiff.
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Old 09-22-2009, 12:01 PM   #4
Patrick L
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Becasue ITS racecar

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DSP

750lbs/F 600lbs/R, Zzyzx coilovers Koni 8611's (may go up to 700's in the rear to get it to rotate better on the concrete at Lincoln)
Camber -3f, -2r
1" front bar, 20mm rear(going to a 22mm rear adjustable one.)
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Old 09-22-2009, 08:43 PM   #5
madlib
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blue

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DSP

9 kg/mm - F, 550 lbs/in - R
Koni 8611 in stock housings
7/8" hollow front bar, 1.25" hollow rear bar
-3 F, -2 R
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Old 09-23-2009, 10:56 AM   #6
neilschelly
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FSP

Springs: Front 10k (~550lb), Rear 8k (~440lb)
Megan Racing Street Coilovers (single adjustable)
Sway bars: 25mm front Tribeca bar, 20-22-24 Whiteline rear bar on full stiff
Toe: 1/8-1/4" front toe out, 1/3-1/2" rear toe out
Camber: -3.5 degrees front, -3 degrees rear
Tires: 255/40R13 Hoosier A6 on 13x9" wheels

I never got the time to really play with the alignment this year. I ran too much rear toe out, which helped with rotation immensely, but I think if I reduced the rear camber, I'd have gotten the same effect with more stability. In general, all those numbers are exaggerated a bit for concrete and should be a little closer to 0 for tarmac, but the following pic seems to suggest that I was just about maximizing my lateral grip in Nebraska.
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Old 11-10-2009, 04:18 PM   #7
DougM
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2000 2.5 RS Coupe
Mitsubishi EVO IX

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been on here researching swaybar options for the 2.5RS that are larger than 22mm... Addco doesn't seem to make the 1" anymore and the Tribeca bar measures 22.25mm. So what's left looks to be the whiteline BSF20XXZ measuring in at 27mm adjustable. Incidentally, I've seen a lot of people referring to this bar as 27/29. From what I've been reading their adjustable bars are listed at their maximum size (27 in this case) and then adjust down from there. So, it would seem the bar is really a 27/26.5 or so. thoughts?

Is that (27mm) too much bar for a street tire autocrosser? If not, what would you recommend for the rear then?

our specs:

ST class

400# front and 340 rear springs on T2's
22mm front bar (BSF19X)
18-22mm rear bar
.25 toe front
0 toe rear... this might change
-3.2 camber front
-1.0 camber rear

OP, are you on race rubber?
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Old 11-10-2009, 06:17 PM   #8
speedyHAM
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XP class Impreza L

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Yeah- 275-35R15 Hoosier A6's.

With your 400# front and 340 # rear springs the 27mm bar could be just the ticket for you.
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Old 11-10-2009, 06:31 PM   #9
DougM
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Mitsubishi EVO IX

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yeah, I'm debating... that or trying to fit the Addco 1" legacy bar...

are you happy with the balance of your car as is? if so maybe just back off the camber for now and see if your times improve/temps get more even. I'd also triple check to make sure your toe is actually at zero/no scrubbing.
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Old 11-12-2009, 10:31 PM   #10
mofugga
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BRP

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i've got a 24-26mm whiteline on my car and love it at 26mm. i get a bit of a rub on the header but nothing too serious.

koni's w/prodrive p1
-1.2 front (my alignment guy sucks)
-.8 rear
0 toe all around
18-22 rsb set at 22
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Old 11-12-2009, 10:48 PM   #11
DougM
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Mitsubishi EVO IX

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thanks for that, do you happen to know the part number for the 24/26? that's not a size listed in their application guide.... (and pretty much exactly the size I'd like to have). Do you have an aftermarket header?
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Old 11-12-2009, 10:55 PM   #12
mofugga
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yeah, i've got borla's. i believe it's this one WLBSF20XZ
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Old 11-12-2009, 11:13 PM   #13
DougM
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Mitsubishi EVO IX

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Quote:
Originally Posted by mofugga View Post
yeah, i've got borla's. i believe it's this one WLBSF20XZ
the bsf20xz is listed as the 24mm adjustable.. adn if you believe this here, they're saying that's 24/23.5~ish

good to know it mostly fits ... can't imagine their 27 would though
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Old 11-13-2009, 10:09 PM   #14
Scooby South
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99 Ver6 Recreation
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Nothing Special:
FSP/STX:
WRX Eibach Pro Springs from SPT
06 Front WRX Struts
07 Rear STi Inverted Struts
25 mm Tribeca front Bar
20-24 Whiteline Adj Rear set at 22
Cusco WRX Front Camber Plates rotated for max Caster and -2.5 Degrees Camber
Kartboy Front Endlinks
Kartboy original Rear Spherical Endlinks
All Diff, Trailing arms, Lateral link Bushings Replaced...

Very Neutral handling...

Bill
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Old 11-17-2009, 10:56 AM   #15
gr8r rex
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www.forced4s.com

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I got a buddy real serious about building a fully competitive BSP STI over this winter. He is very up in the air about what kind of rates to run. For coilovers hes most likely going JRZ Pros but deciding on spring rates is the hard part.

So what do you guys think? Math wise, 900 front and 650ish rear should be good for weight distribution, but he was thinking around 900 all around to start off and work from there? Anyone have an idea? Or does anyone know close to what stompy was running?
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Old 11-28-2009, 06:55 PM   #16
roadkil
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excellent thread. anyone(cough, Jay, cough, Patrick) want to throw up their baseline ride heights and any geometry corrections(roll center, can you even do this in -SP?)

thanks- zach
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Old 11-28-2009, 10:30 PM   #17
Storm
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Developed Beater

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Can't measure from the fender lines anymore.....they're not exactly stock. Start with the control arms a little shy of being flat (hub ends lower than chassis ends) and go from there.

Can't do roll center adjustments in SP, but you can make something reasonably good if you don't slam the car too much.

Jay
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Old 11-29-2009, 01:28 AM   #18
bdi
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Quote:
Originally Posted by gr8r rex View Post
I got a buddy real serious about building a fully competitive BSP STI over this winter. He is very up in the air about what kind of rates to run. For coilovers hes most likely going JRZ Pros but deciding on spring rates is the hard part.

So what do you guys think? Math wise, 900 front and 650ish rear should be good for weight distribution, but he was thinking around 900 all around to start off and work from there? Anyone have an idea? Or does anyone know close to what stompy was running?
This is a better place to get your question answered:

http://forums.nasioc.com/forums/show....php?t=1193491
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Old 12-10-2009, 11:28 PM   #19
flyboymike
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WR Blue

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Quote:
Originally Posted by DougM View Post
the bsf20xz is listed as the 24mm adjustable.. adn if you believe this here, they're saying that's 24/23.5~ish

good to know it mostly fits ... can't imagine their 27 would though
I've got a WRX wagon, which I believes shares the GC/GM/GF track width up front. The 27mm Whiteline bar does work out for me width-wise with spherical endlinks and using my advanced degree in washer stackology. But, I don't know how header clearance would work out for you guys.
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