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03-14-2012, 12:08 AM | #1 |
0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
Location: so cal
Posts: 926
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Alignment Specs Question
To the AutoX'ers out there what alignment specs are you guys running. My thoughts are to leave the rear in spec to help it rotate a bit and run the front at -1° - -2°. Since I haven't found a way to increase caster its going to say stock.
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03-14-2012, 12:44 AM | #2 |
Drives: 2009 5-door, 5-speed Join Date: Sep 2011
Location: White Rock BC
Posts: 687
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Probably not much help but I'm running in HS so set camber to the maximum legal spec (-0.92° iirc). Tire's are wearing reasonably well from autoX so it probably doesn't need much more for a mild car. I haven't fiddled with toe at all.
Someone must make a camber/caster plate? If not they aren't hard to make. Some measurements and a local machine shop should get you sorted. I love lots of caster in RWD cars but have never played with a FWD before. |
03-14-2012, 12:58 AM | #3 | |
Drives: 2015 H Production Yaris Join Date: Oct 2009
Location: Debary, FL
Posts: 1,953
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Quote:
I would not even consider less than -2 as a starting point. We have -2.5 on the Bspec car (rules limited) and -3.2 on the Prod car. Rear is stock on all of our cars.
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03-14-2012, 01:30 AM | #4 |
0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
Location: so cal
Posts: 926
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I spoke briefly with the chassis engineer helping me out about increasing caster, he though it should provide a small benefit but it would likely not be noticeable.
Coming from RWD cars with crappy front suspension adding lots of caster was a critical change that had to be made in order to get the car to turn in. |
03-14-2012, 01:49 AM | #5 | |
Drives: 2015 H Production Yaris Join Date: Oct 2009
Location: Debary, FL
Posts: 1,953
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Quote:
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2005-2008 SCCA Solo BS National Champion 2017-2018 SCCA H Prod National Champion |
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03-14-2012, 01:52 AM | #6 | |
Drives: 2015 H Production Yaris Join Date: Oct 2009
Location: Debary, FL
Posts: 1,953
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Quote:
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03-14-2012, 09:18 AM | #7 |
Drives: 2012 Yaris SE Join Date: Nov 2011
Location: Northern NJ
Posts: 179
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I'll let you know shortly how much front camber can be had with the thinnest factory crash bolts for Yaris. As far as caster goes, there's always a little 'fudge' in the subframe. Loosen all the subframe mounting bolts, push/pull the subframe towards the front of the car, and lock it down. Alignment will be necessary of course if you found that you moved it a lot.
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03-14-2012, 11:27 AM | #8 |
0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
Location: so cal
Posts: 926
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03-14-2012, 06:41 PM | #9 |
Drives: Scion xA Join Date: Oct 2009
Location: Virginia
Posts: 449
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I run -2.7 degrees in the front, -1.1 in the rear, .15 toe in per side on rear ( yes I did adjust rear... With feeler gauges in between hub and beam flange) . Rear is considered to be within factory spec though.
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03-14-2012, 09:57 PM | #10 | |
Drives: 2009 5-door, 5-speed Join Date: Sep 2011
Location: White Rock BC
Posts: 687
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Quote:
" Both the front and rear suspension may be adjusted through their designed range of adjustment by use of factory adjustment arrangements or by taking advantage of inherent manufacturing tolerances. This encompasses both alignment and ride height parameters if such adjustments are provided by the stock components and specified by the factory as normal methods of adjustment. However, no suspension part may be modified for the purpose of adjustment unless such modification is specifically authorized by the factory shop manual for non-competition purposes. Unless I am missing something, the bold part means in stock class one needs to stay with in the stock specifications. Doesn't really matter as I think I only have one more event in HS. After that it's STF. Cheers. |
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03-14-2012, 11:19 PM | #11 |
Drives: Scion xA Join Date: Oct 2009
Location: Virginia
Posts: 449
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If I were you, I would get a smaller diameter bolt ... Say 2mm smaller. Install in top strut pinch flange hole, and set it in. Or shave down the shaft of the oem bolt and do the same. Hehe
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03-14-2012, 11:49 PM | #12 | |
Drives: 2015 H Production Yaris Join Date: Oct 2009
Location: Debary, FL
Posts: 1,953
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Quote:
13.8.E. If offered by the manufacturer for a particular model and year, the use of shims, special bolts, removal of material to enlarge mounting holes, and similar methods are allowed and the resulting alignment settings are permitted even if outside the normal specification or range of specifications recommended by the manufacturer. If enlarging mounting holes is specifically authorized but no material removal limits are specified, material removal is restricted to the amount necessary to achieve the maximum factory alignment specification. Order the smallest set of Toyota bolts for the Yaris and max it.
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03-15-2012, 08:13 AM | #13 |
Drives: Scion xA Join Date: Oct 2009
Location: Virginia
Posts: 449
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Does the dealership install front camber bolts if need be? We do all the time but I don't work at a dealership lol. I'm just curious, if anyone knows.
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03-15-2012, 10:26 AM | #14 |
Drives: 2015 H Production Yaris Join Date: Oct 2009
Location: Debary, FL
Posts: 1,953
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Yes. Although it is likey rare. They would rather find out why the alignment is out of range and replace the part that generates more revenue.
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03-15-2012, 02:25 PM | #15 |
Drives: 2012 Yaris SE Join Date: Nov 2011
Location: Northern NJ
Posts: 179
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Here are the part#s for those who are interested:
90109-15002, 13.9mm 90109-15003, 13.3mm 90109-15004, 12.4mm Just keep in mind that while using these bolts, there is a risk that they'll slip out of adjustment under high load conditions. |
03-15-2012, 02:31 PM | #16 |
0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
Location: so cal
Posts: 926
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Thank you. I haven't had much luck in finding correct Part#s.
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03-15-2012, 09:45 PM | #17 | |
Drives: 2009 5-door, 5-speed Join Date: Sep 2011
Location: White Rock BC
Posts: 687
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Quote:
Not sure how I missed that... besides being tired and stupid. Thanks. I didn't really look too hard at the Stock rules last night to be honest. Was more interested in STF rules. Trying to not spend money on the Yaris (daily driver) and get the project car done instead. Not sure what I would throw at the Yaris besides tires and align. Maybe a seat so I can left foot brake (instead of using my left leg to brace myself against the door). And lighter wheels... and.... arg! Cheers. |
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03-15-2012, 09:46 PM | #18 |
Drives: 2009 5-door, 5-speed Join Date: Sep 2011
Location: White Rock BC
Posts: 687
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