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Hello, I just wanted to relay my findings and promote a little solution I came up with. Most people are aware of rear aftermarket toe arms such as Spoon's or Nagisa auto. (FYI, I don't recommend Megan racing or hardrace because it looks as if it is designed to continue to use the factory eccentric adjustment instead of adjusting the length of the arm plus it still uses a bushing on the inboard side instead of a Heim joint.) There are basically three benefits to running these aftermarket arms.
1. The Heim joints don't flex like the factory arms which helps keep the suspension geometry as intended under high corning loads
2. You can adjust the knuckle side pick up point to improve your bumpsteer curve after lowering your car with the washers/ spacers that come with the aftermarket arms. (lowering your car increases the amount of bumpsteer your suspension will have.)
3. You can run a longer toe arm. I have measured and adjusted bumpsteer on both AP1s and AP2s with lowered OEM suspension and with Wisefab. In every case it was beneficial to have the factory eccentric in the most inboard condition. This means you adjust the factory toe adjustment so the toe arm is as far inboard as the adjustment will allow and you just lengthen the arm by threading out the ends, affectively making the arm longer. see picture.
That all said, your alignment guy may still come in and adjust your factory toe adjustment and worsen your bump steer or if you run slicks and corner at high G's it is possible the factory adjustment might slip. I ended up making these little lock out washers that will prevent that from happening. This way your alignment guy has to use the aftermarket toe arm to adjust rear toe and there is no chance of it slipping. It just replaces the factory eccentric washer so you can still use the factory bolt and nut. You can but them on SplinMota.com
Nice, wish more toe arm manufacturers would include these plates to fixate that adjustment bolt but they probably question the likelihood of those bolts slipping if torqued correctly. But yeah, the innermost location would have the highest arc radius thus the least amount of toe change through the range of motion of the suspension. Thanks for making these.
So far, I've only found ASM to include these plates with their arms: https://autobacs-asm.com/original200...O=ASM-AP122014
They have front tie rod ends with bump steer correction as well. Too bad its hard to get and expensive as hell despite the weak Yen.
Bumpsteer Correction
