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Old 06-02-2009, 08:34 PM   #1
Legacy
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2007 Forester XT

Default How does raising height impact toe/camber ?

I'm running a set of coilovers on my Forester XT and this year went with a set of 17x9's to replace my Slipstreams. After my first auto-x event I found unless I run max camber (-3) in the rear, I am gettnig some fender rubbing in the rear. While I am planning on rolling the fenders, I am debating raising the height a tad, 1/4 to 1/2 inch to help prevent rubbing in the corners.

My question then is : What will happen to toe/camber if I raise the car up ?
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Old 06-02-2009, 10:35 PM   #2
Storm
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Camber will stay pretty much unchanged. Toe will change....I don't remember what direction it'll go when raising (iirc, inward)...but it will move.

I suggest rolling the fenders and leave the height alone.

Jay
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Old 06-02-2009, 11:41 PM   #3
gregr01
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Camber will move in a positive direction, toe will move in an inward direction. Though with only 1/4 or so height change the, the alteration of camber and toe won't be much. I'd still do an alignment, even if I was only adjusting 1/8".

If rolling the fenders will resolve the rubbing issue it's a much better solution than increasing ride height.

You are losing performance with that much negative camber in the rear. Can you get it closer to -2 by rolling the fenders? When you do roll them, don't mess around; smash 'em as flat and push them out as far as you can get them to go.

I played around the first two times, finally smooshing 'til they wouldn't smoosh any more. Ended up fitting 265/35/18s on 9-inch wide wheels with no problem, running -3.2 front and -1.9 rear--on an '04 STi, which is relatively space challenged (for an STi).

I realize you're Forester is probably space challenged for tire clearance, but what tire size are you running? (Just curious.)
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Old 06-03-2009, 12:06 AM   #4
Jaxx
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do you have camber adjustable strut tops

the old trick is to set the tops all the way negative and us camber bolts to correct

or how about adjustable length lateral links and move the whole hub inboard 1/2"
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Old 06-03-2009, 08:24 AM   #5
Legacy
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Here's my setup specs below. Running Hotbits coilovers with adjustable camber plates. I adjust the plates at Solo II/Track events to max out camber. I like my camber bolts maxed in/out to minimize any chance of slippage.

The (2007 XT)Forester has a suprisingly large amount of room to swallow tires, the fenders are flared nicely from the factory. Originally I had the rear camber bolts set min camber and on my first Solo II run the other week the LR tire rubbed badly. So, I changed to max camber (camber plates already at max camber) and there was minimal rubbing if any. Not sure how much I could push the plates outwards before it rubs again. I just wanted to solve the problem at the event quickly. Maybe after I roll the fenders I'll start moving camber .5 degrees per run and see if/where it starts rubbing. Originally with the rear camber bolts set to min camber + max camber on plates it gave -1.2 on the street and -2 on the track settings, both with 0 toe.

Wheels/Tires: Rota DPT 17x9 ET42 / Kumho V710 245/45/17, will also be running same size wheels + Toyo RA-1 255/40/17 at track events later this summer.



Front
****************LEFT*************RIGHT
Ride Height*******14 1/8 inches ******14 1/8 inches
Camber Bolt position*Full Negative*******Full Negative
Street Camber*****-1.4*************-1.4
Camber Plate Position*8 lines from inboard**8 lines from inboard
Max camber********-2.7*************-2.8
Camber Plate Position*Max inboard*******Max inboard
Toe Front Wheels****Front 177.7*******Rear 177.8
Overall Toe *****1mm difference

REAR
****************LEFT*************RIGHT
Ride Height*******13.75 inches******13.75 inches
Camber Bolt position*Full Negative*******Full Negative
Street Camber*****-1.5*************-1.8
Camber Plate Position*9 lines**********8 lines
Max camber********-3.3************-3.1
Camber Plate Position*Max inboard******Max inboard
Toe Rear Wheels***Front 1.178.35*****Rear 1.78.5
Overall Toe *****1.5mm difference

Last edited by Legacy; 06-03-2009 at 09:17 AM.
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Old 06-03-2009, 11:15 AM   #6
gregr01
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I ran those same 245/45/17 V710s on 8.5 wheels for a while, and then went back to street tires for autox in 255/40 on the same wheel. I also used the RA-1 in 255/40 on 8.5 for track days.

Why not run 245/40/17 in the V710s (now that they're available) and have both shorter gearing and more clearance?

Definitely time to get those fenders rolled!
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Old 06-03-2009, 12:16 PM   #7
Legacy
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Sure but I'm not going to waste a good set of V710's I already paid for. Next set maybe... And the last thing an XT needs is lower gearing. Depending on the track layout I can hit 3rd gear in several sections or bump off the rev lmiter in 2nd.
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