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04-08-2009, 09:04 AM | #1 |
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AutoX suspension setup help
I've ran a few AutoX's now and I'm ready to try to get a little more serious and tune my suspension, problem is I don't really know what to do. I'm not going to be winning anything with my car but I do want to be able to perform as best as possible. I'm looking for a general tune that really just wakes up the car and makes it more responsive. Can anyone help with a nice standard setup (alignment/camber/caster/toe) for my car?
2007 Impreza 2.5i (STX prepared - at least I was told, let me know if that's wrong) Mod list (at least the relavant ones) Megan Racing 32-way adjustable coilovers Rallitek 22mm front sway bar Rallitek 22-24mm adjustable rear sway bar Rear endlinks/Heavy duty mounting brackets/poly bushings STi Front strut bar STi rear strut bar 17x8 Enkei RPF-1's Continental ContiSport Contact 3's (225/45/17) I currently have the coilovers set at a 2in drop in the front and 1 3/4in drop in the rear.
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04-08-2009, 09:19 AM | #2 |
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You have a nice setup. But since you are running 17x8, why don't you try 235/45/17 too?
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04-08-2009, 09:28 AM | #3 |
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04-08-2009, 10:19 AM | #4 |
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Here's some crazyness about your classing.
5 speed? You should be in ST. Automatic? STX is correct due to having something other than a) all open diffs and/or b)viscious limited slip. What's your spring rate? People have had sucess from anywhere between 250lb springs to 500lb+ springs. Dependent on if your dampers can handle them. What about alignment? I don't see any camberplates for the front, unless they're included with the Megans. I would get as much [edit] negative [/edit] camber as you can in the front. And then toe out the rear a hair and go from there. --kC Last edited by KC; 04-09-2009 at 08:31 AM. |
04-08-2009, 10:34 AM | #5 | |
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I'm not sure on my current spring rates, how can I get that number? I've been running the coilovers at their mid-range level (8 clicks I believe) They have camber plates, so positive camber in the front? |
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04-08-2009, 11:56 AM | #6 | |
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To be competative in STX you will also have to get a lot better tire. |
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04-08-2009, 12:13 PM | #7 | |
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04-08-2009, 12:19 PM | #8 |
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Your setup looks pretty sound, some STX WRX drivers go a lot bigger on the rear sway bar to force the car into oversteer but the secret is to find a good balance in handling between oversteer/understeer.
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04-08-2009, 12:21 PM | #9 |
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With the drop you're running, some roll center adjusters to get camber under load back?
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04-08-2009, 12:38 PM | #10 |
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^^^ where do I buy them?
I dont have the money right now but I'll put them on my list...unless someone else says it's a bad idea OT question: Can you remove your rear seats and stuff for STX? |
04-08-2009, 12:49 PM | #11 |
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04-08-2009, 12:56 PM | #12 |
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04-08-2009, 02:25 PM | #13 |
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http://www.legacygt.com/forums/showthread.php?t=38837
http://forums.nasioc.com/forums/show....php?t=1055510 About all the info you need on roll center adjusters. Lower beyond 1", and you mess up the suspension geometry, which leads to bump steer and an even worse camber curve. |
04-08-2009, 04:11 PM | #14 | |
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04-08-2009, 04:35 PM | #15 |
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According to the links, this mod is illegal for STX
"Q. I Autocross. What class will the kit put me in? A. For Autocross, installing our ball joint relocation kit will put you in Street Modified. Unfortunately neither Stock, Street Prepared or Street Touring classes allow modifications to suspension geometry. Unlike an ALK, which relocates suspension points and puts you straight into Prepared class, our kit adjusts a part of the "moving suspension," which is legal in Street Modified." OP..Dialling in a good amount of negative camber to your front tires will make a big difference for you, and Megan coilovers allow you to do this. Question, how does the car feel now on the limt? Does it understeer? |
04-08-2009, 05:03 PM | #16 | |
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Yes, the car understeers right now. |
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04-08-2009, 05:17 PM | #17 |
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04-08-2009, 06:38 PM | #18 | |
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I know I've already said this, but you have megans which allow you to slam your camber to a huge negative amount for free! so do it. Invest in an allen key that fits your coilover screws on top of your camber plates, then jack up your car and slam the front camber before your run. That will dial out a lot of understeer right there. |
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04-08-2009, 06:49 PM | #19 | |
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04-08-2009, 07:42 PM | #20 | |
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Your biggest issue is your tires. Get some wide/sticky. You may be too low. I don't know though. Could you measure it a different way for us? The Nasioc Motorsport and Suspension forums generally measure suspension height from center of the wheel hub to the metal part of the fender directly above the hub. "Drop" means nothing to us because includes several things. Wheel diameter, tire profile and spring height. That is, I can install 2" drop springs, 19 inch wheels with 225/35R19 tires and ride higher than a stock WRX. |
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04-08-2009, 07:59 PM | #21 | |
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I still don't know how to tell what spring rate I'm at since it's adjustable (help?) but Megan's site says they're 8kg/front 6kg/rear. |
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04-08-2009, 10:54 PM | #22 |
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04-09-2009, 07:38 AM | #23 | |
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And to clarify, because it's really really important. You do not want positive camber. KC meant you want as much negative camber as possible. Positive camber can even be dangerous. After that, tires and seat time are going to be your best helpers. -N |
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04-09-2009, 08:24 AM | #24 |
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04-09-2009, 08:30 AM | #25 |
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Just the front. Thanks Niel. Yeah, I always think that I'm talking to someone who may have an idea... gotta work on clarifying a little more. I'll edit the post.
The rear? You want about -.8 to -1. The less the better for rotation. |
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