BC7 SUBARU LSi looses stability while straight running after consuming a half amount of fuel tank 30L, then pouring to full level gauge, the stability suddenly regains. Remember the past, initial Legacy model based on the SUBARU strategy planning called 44B as internal designation lacks the angle of frontal caster leading to less sense of calm of steering action, just it is influenced by dynamic noise from the rough ground surface. The opinion dictated by some engineer might have been to the point who had been a member of the SUBARU Research and Development division. According to his saying, factory decided less caster angular value was the agonizing selection to avoid the reverse steering reaction when fully steering turned. They had sacrificed the most important stability of critical straight running only because of the reason for the seldom not unlikely fully steering turned reverse reaction. Now I have made up my mind to select the physical property of straight running rather than full turn.
There are two ways to increase caster angle, one is move the transverse ling forward to reposition the knuckle ball joint position to the same direction, and the another is resetting the upper strut mount backward forming some long holes on the strut tower body side. If I select the former way, all the driving train is moved forward leading to positioning DOJ forward forming inconvenient angular inclination in addition to steering linkage also. On the other hand, I choose latter way, just one critical point displacement would be enough, judging from out side, 3 to 5 mm displacing the strut mount position looks relatively an easy task with a round filing procedure. This would be planned as one of a future interesting modification for BC7 Legacy.
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