Set Back error

The wheel alignment adjustments on NCP10 Vitz and EP82 Starlet have made me realize the importance of "Set Back". However precisely the alignments and geometry may be established, strange and unexplainable steering reaction is not possible to eliminate thoroughly if the existing of set back is ignored. Suppose the wheel bases on both side are so adjust to be the same value according to standard one with the condition of including set back error. The behavior itself is the same as producing "Swung Rear End" error.

So it is said that the initial step of wheel alignment is checking and examining the set back error in any case, otherwise the later efforts are all in vain however hardships may be overcome after that. It took me so long period of time this trifle but indispensable factor.

Today I'll re-examine the error of set back on SXE-10 Alteza.

Written in the evening:

The set back value plus 1,73 min(angle) was found on SXE10 Alteza, so left frontal lower arm bolts connecting with knuckle were loosened and re-tightened for adjusting in combination with toe adjustment.

Tight and solid steering feeling was increased in centric position after correction. The more precise wheel alignment leads to the more confidential and concrete steering stability.