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11-24-2009, 11:46 AM | #1 |
What?
Drives: 2007 Yaris LB Join Date: Nov 2008
Location: Safety Harbor, FL
Posts: 1,006
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The final word on this discussion will have to wait until someone does some before and after alignment checking.
My speculation is that it simply improves the toe curve on a lowered Yaris, letting the rear suspension work more like it would at stock height. It's not gonna give you "toe out", just "less toe in". Now... here's a question for those who have done it. (I'm freakin' lazy, could be months before I get around to it) Is there enough slop in those pivot bolts that the alignment of the rear axle becomes an issue? Can you end up "dog-tracking" due to the rear axle assembly not pointing straight along the centerline of the car? Or are they tight enough that it's not a concern? (probably another question that it will take an alignment rack to answer accurately) Last edited by Loren; 11-24-2009 at 12:48 PM. Reason: added the word "not" that was left out |
11-25-2009, 12:20 AM | #2 | |
Slowy getting there
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11-25-2009, 12:28 AM | #3 | |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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11-24-2009, 12:21 PM | #4 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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I should take my car to one of those "free alignment checks" like firestone and wheel works. And see how it looks afterwards.
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11-24-2009, 12:34 PM | #5 |
Drives: 2007 Yaris LB Join Date: Mar 2007
Location: San Jose, CA, USA
Posts: 685
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Let us know what they say. I just did this last weekend and I'm curious too.
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5% Tint Rear | Micro Image LED Ignition Light Kit |
11-24-2009, 02:32 PM | #6 |
AD&D Dork
Drives: 07Liftback/07sedanS Join Date: Oct 2008
Location: US-V.A.
Posts: 83
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I just lowered my yaris a little while ago and I still havent gotten around to adressing the toe and camber alignments yet. I was gunna just shim the rears but I think this in combo with the shims might be a better solution.
here's my basic explanation on what this mod would change(see pictures attached) I think that on a stock height car, this mod isnt needed.
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Mods: K&N filter, Megan Coilovers, Ultra Racing 19mm rear sway bar, Sun tachometer, Window Tint. |
11-24-2009, 02:53 PM | #7 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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So if i go back to my technical schooling days it looks like that mod changes the caster. But caster dosnt really make much difference unless it is on the steering tires.
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11-24-2009, 03:12 PM | #8 |
AD&D Dork
Drives: 07Liftback/07sedanS Join Date: Oct 2008
Location: US-V.A.
Posts: 83
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my uber simple drawing don't really show the effect on the toe and camber very well but this mod does effect both.As the caster angle changes toe turns into camber and vise-versa. If there were absolutlely no stock Toe or Camber than it wouldnt matter, but that isnt the case.
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Mods: K&N filter, Megan Coilovers, Ultra Racing 19mm rear sway bar, Sun tachometer, Window Tint. |
11-24-2009, 03:02 PM | #9 |
What?
Drives: 2007 Yaris LB Join Date: Nov 2008
Location: Safety Harbor, FL
Posts: 1,006
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The way the rear axle assembly is designed, it also changes toe. (caster is irrelevant, as the rear wheels don't steer)
At stock height, the car has a certain amount of toe-in. As the axle rotates up (when the suspension compresses... or when the car is lowered) on its pivot point, the angle goes more inward. If you lower the car and DON'T move the pivot point, you have more static toe-out than stock, which isn't good for turning. (great for going straight) Moving to the higher pivot point on a lowered car should bring the toe back closer to factory spec. |
11-24-2009, 03:05 PM | #10 | |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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11-24-2009, 04:49 PM | #11 |
Awesome discovery. I have had mad rubbing issues on the rear since installing the PG rear hub spacers because of how much toe in there is. Hopefully doing this mod will compensate enough to clear a lot of it up.
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11-24-2009, 06:59 PM | #12 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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I did mine on a rack today and it was a real PAIN in the ass to get the back side of the bushing lined up. Ended up having to disconect the shocks so i could get the torsion beam to move a bit to get it to finally lined up. Took me with a flashlight and another guy with a pry bar prying on the end of the bushing to get the bolt hole to line up.
After test drive i notice you have this feeling like the car is more leveled or like the rear end is sitting lower now. Also going over bumps i started to hear this clank clank sound. Turns out the torsion bar sits higher up now i guess because of the angle. So its banging against my megan tie bar. I am going to see if i can get a file and file it down. If not looks like i may have to remove it. So for those who have that rear little bar by the gas tank that seems like it has no use at all make sure you remove it first before you do this mod.
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11-25-2009, 10:50 AM | #13 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Hmm i can almost swear the rear of my car sits lower now. The fender gap is the same but the rear of the car is lower. Its as if the car has 15s in the front and 17 inch rims in the back. And then i swapped out the 15s back in the back. Before and after. It looks like i lowered the car about a inch more looking strait on from the back. I dont think its some placebo effect either looking strait on it does look lower. But looking from the side from the wheel and fender it looks the same. If someone is planning on doing this mod please take a tape measure and measure from fender to ground and rear bumper to ground before and after please.
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11-25-2009, 12:34 PM | #14 | |
Apexing Egg!!
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HighTach Motorsports 2007 Toyota Yaris-ARGH!! Mods: Tokico HTS, 6.6 kg F, 6.1 kg R custom springs, 23 mm RSB, 2-way TRD LSD, 15x7 +25 Team Dynamic wheels, 195/55/15 Dunlop Star Specs, Cobra Suzuka S |
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11-25-2009, 12:27 PM | #15 |
www.yarisclub.gr
Drives: yaris 1.3 2sz - 1.33 1nr Join Date: Jan 2009
Location: greece
Posts: 199
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from these that you write, the axle going down but the height is the same.
maybe that is... |
11-25-2009, 12:35 PM | #16 |
Apexing Egg!!
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oh, we need a sticky on this topic btw
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HighTach Motorsports 2007 Toyota Yaris-ARGH!! Mods: Tokico HTS, 6.6 kg F, 6.1 kg R custom springs, 23 mm RSB, 2-way TRD LSD, 15x7 +25 Team Dynamic wheels, 195/55/15 Dunlop Star Specs, Cobra Suzuka S |
11-25-2009, 06:48 PM | #17 |
Now that I look back at it as Loren stated it should help lessen the amount of toe out. My only concern is with that part of the axle postioned up higher wouldn't it make the wheel go back towards the rear of the car more when it is flexing. My problem is my tire is rubbing in this area.
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11-25-2009, 06:51 PM | #18 |
pic of my rear wheel after spacer install.
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