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05-11-2009, 12:40 PM | #1 |
Scooby Newbie
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Alignment setting suggestions for track setup
I'm setting up my WRX for HPDE use (stepping up from a spec miata), and wondered about alignment settings (specifically camber) for the car. It's seen a good bit of autocross on street tires, and with camber plates set at ~3 degrees, it still murdered the outside edges of the tires and didn't touch anywhere else.
I can only imagine body roll getting worse with stickies, so I see the problem being exacerbated. Car mods: Ground Control Coilover kit, stock dampers. 300lb/in springs, F/R. Ground Control Front camber plates in front. Stock wheel bearings, 17" wheels to clear Brembos. Current alignment settings: 0 toe F/R, 1.5 degrees negative camber all around. Can anyone tell me what appropriate settings for this type of setup would be? I'm unwilling to purchase a roll bar at this point; I'd like to run the car like it is, then modify further and watch the improvement. In the meantime, I'd rather not destroy tires. I'm worried that by running enough camber to avoid rolling over the tires, I'll have absolutely no strait-line grip, effectively killing braking zones. Thanks!! -Matt McBride Bigger, Better, Faster Racing |
05-11-2009, 12:46 PM | #2 |
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you went from spec miata to a wrx? I went just the other way from a STi to a spec miata.
I would try to find some bigger sway bars if you're getting a lot of roll. something in the ball park of 24/24 or 27/24. for alignment specs I ran ~-3 in the front, -1.5 in the back, max caster, with a touch of toe in in the rear, and a touch out in the front. |
05-11-2009, 01:14 PM | #3 | |
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05-11-2009, 12:56 PM | #4 |
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Will this car be driven on the street at all for daily use?
I suggest -2 f / -1.5 r What tires will you be running? |
05-11-2009, 01:16 PM | #5 |
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Just don't run 5w-30 at the track.
I'm at -2.5F -2+ R and I could use more up front. 24mm/24mm bars. I wouldn't normally run so much in the back but, I need it to get clearance for my tires and wheels. The car's fairly neutral with a touch of understeer. I could probably dial it out by going one stiffer on the rear bar. I'd had a 27mm front bar and didn't like it for the track. The front end tended to skitter over bumps. I think because the bar prevented the suspension from acting independently. |
05-11-2009, 01:50 PM | #6 |
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^ agree.
Im at -2.5 front with canted front plates with -1.4 in the rear. 24/24 sounds better to me as well then 27/24 ...which i also did not like. right now im at 22/26. But this is an sti.. and there's some difference with a wrx setup. Like spazegun said i think starting with -2.5 front is a great start. |
05-11-2009, 03:10 PM | #7 |
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Also an STi checking in
-3 in front, -2 in rear for me. Caster is almost max in the front. Rear toe 1/16th (total) in, front toe 1/8th (total) out. I used to run straight up rear toe, and the car felt more stable in a straight line... but definitely was unpredictable under braking. The rear toe helped a lot. at -2.25 to -2.5 camber in the front I had terrible problems tearing up the outer edges of tires. -3.0 SEEMS to be good. |
05-12-2009, 07:47 AM | #8 |
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3 degrees of camber... god, that just sounds atrocious.
In terms of tires, I'm planning on running Koni Challenge take-offs. For those that don't know, they're hoosiers, but are essentially an endurance compound, and are harder than your average hoosier. I know sway bars are a must, and plan on running big ones as soon as I can. I'd also like to get 6gun's balljoint relocation kit, in order to run less static camber. |
05-12-2009, 08:14 AM | #9 |
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My ST2 car with full STI drivetrain.
-3.5 in front, -2 in back. 750lb spring front, 650 rear. 22 mm front, 24 rear. 1/16 toe in (rear) Zero toe in the front. -Duncan |
05-12-2009, 12:22 PM | #10 |
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Dunk,
I've followed your build. With that kind of spring rate, you'll be getting almost no body roll compared to me, and you're STILL using that much camber?? That's impressive that it takes so much. I suppose at that point, you're compensating for tire roll-over more than body roll? Thanks for the great, quick responses! It's nice to see there's a reasonably strong group of folks who actually put their subies to use! -Mateo |
04-14-2013, 04:57 PM | #11 |
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Should i get some toe out in the rear to make the car a little more loose?
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04-14-2013, 05:26 PM | #12 |
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Sounds like you have a good range of feedback here. Part of the alignment depends on the overall set-up and how much daily driving the car will do. My logic is that my car does not see lots of miles so I could run a more aggressive alignment but still with zero toe.
I am running -2.7F and -2.2R with TiC coil overs (camber plates F, adjustable lower control arms rear, 8k/7k), 22mm WL F/R ways on full stiff, spherical links f/r, some chassis bracing and 275/40R17 tires. I have now done three track days this spring at three different courses and feel with the tire pressure and dampening dialed in this set-up is nice and quick. But change my tires and would I want different alignment setting and different dampening? Maybe. Suspension tuning all depends on how deep down the rabbit hole you want to go. |
04-14-2013, 07:49 PM | #13 |
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These cars need lots of neg camber and positive caster, I would run -3 at a minimum up front and -1.5 at the rear.
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04-16-2013, 12:36 AM | #14 |
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I try and run as much camber as I can up front, usually -3.9, -4.1 and around -2.5 + in the rear. I was running less in the rear before (the usual -1.5 everyone says) and the car tended to bounce in the rear on tight bumpy tracks, plus you can see on the tires that there was a good inch or more wide line on the inside of the rear tire that wasn't being used at all (looked brand new). This might work fine for autoX but doesn't make the car feel very composed on tracks. Plus it seems the overall grip of the car improved when I upped the rear camber.
24mm front and 27mm rear bar, various braces, bushings, etc RCE T2's 9k/7k 255/40/17 RS3's I don't run any toe up front, run 0 to very slight toe out in the rear (like 1/32) If you daily, -4 probably isn't the greatest idea... |
04-16-2013, 08:40 AM | #15 |
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For any track car setup on a Subaru we keep the front to rear camber difference to no more than 1*. Meaning if running -4 in the front run no less than -3 in the back. We have found that this drastically increases grip and drops time out on track. We used to run much less rear camber on our setups, but not ant more.
On our race car we run -4.5* front and -4* rear. Tony |
04-16-2013, 12:28 PM | #16 | |
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Interesting about the split. I guess I have that going on already. |
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04-18-2013, 11:31 AM | #17 | |
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Quote:
I read what you say you run and wonder if I should run more camber. In the past I ran 17" wheels and 888's. I was planning on setting the fronts at 3.4 and the rears at 1.8. I think I may try .03~.04 degree toe-in on the rear (about 1/32") and at least the same toe-out on the front. What do you recommend for a GR? |
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04-18-2013, 03:33 PM | #18 | |
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08-13-2020, 06:06 AM | #19 |
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i have a stock 17 sti and will have my first track day recently. Any suggestion for alignment set up? My current plan is camber -2.5 F, -2 R. 0 toe and keep current catering
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08-13-2020, 11:20 AM | #20 | |
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Quote:
Zero toe in front, and just a touch of toe IN for the back to help keep the back end stable at speed and hard braking. Caster isn't adjustable as far as I know on stock stuff. What track are you running? HAVE FUN! |
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08-13-2020, 03:33 PM | #21 | |
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Quote:
laguna seca in aug & thunder hill in sep do u think -2.5 F, -2 R still works for daily once we are back to office? it's around 10 miles from my house to my office |
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04-16-2013, 10:37 AM | #22 |
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Tony, what are your spring rates and what sway bars 'settings' are you using? How much caster do you run? Any other top tips? :P
Right now I am running RCE sways and for a very smooth track it's great... but on any bumps it can get crazy, I am hoping to tone it down here soon... |
08-17-2020, 03:58 PM | #23 |
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I would consider geting a vented hood to keep temps down too
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08-30-2020, 12:38 AM | #24 |
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2016 STI Here.
2.9F Camber / 2.0R Camber / 0 Toe - Nankang AR1's 265/35r18 Fortune Auto 510's - 11k Front / 12k Rear Spring 27mm Front bar @ Soft / 24mm Rear bar @ Medium (Can't reach the Hard because the Headlight level arm (Turn In Concepts replacement one for the OEM) gets in the way. September 6th @ Thunderhill will be the first time on these coilovers, alignment and tires. Past setup (10 track days) was with FA 500 coilovers with 8/8k springs, same sway bars and with RE71's on 3.3F / 2.3R. I was never ever able to reach the outer edges of the tires where the triangles were. From my understanding, you're supposed to be taking the tips off of those (Yes i know those are to tell you were the wear indicators are..). I might be sizing down to a 24F bar, or if i can figure out a way to go full stiff on the rear bar, i might give that a try. The large front bar has GREAT turn in, GREAT high speed stability, but is hard to get the nose around on hairpins like Laguna Seca's T2. And... of course.. PFA. |
08-30-2020, 04:00 PM | #25 | |
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Quote:
Whiteline 24mm front sway bsf39xz, two hole adjustment (full soft) KLC139 Front Sway bar - link assembly Whiteline 24mm rear sways bsr49xxz, three hole adjustment (full stiff) SuperPro adjustable links. More here in my journal. I run 285 Hoosiers. I don't know if yours is a street car or not and how heavy, but you might want to go softer on the front sway bars and perhaps the front springs. I also have racing diffs and much more, but I sure like the neutral feel of the car on all but the slowest turn. Even there, it is not the way it ploughed when I first autocrossed it before turning it into a track car. Racing diffs really help. With my stup I can consistently generate 1.3 G's and briefly 1.5. |
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