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What is your ride height? and what bushes are installed and how old were they when you checked alignment?...

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i would double check with a string line for sanity check. i had one shop tell me i had 3.5mm total toe out at one point and it actually wasn't and confirmed with 2 other shops later and my own basic string...

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Here is the “short” update list (high level). I will try expand in due course with happy snaps where these were taken for the stuff that has been done:

1) I installed new set of wheels mid...

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Remember that the primaries are fairly short so tune in at very high rpm (reflected suction wave arrival time is favorable to assist at overlap basically at high rpm) so the most meaningful way to get...

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all of the 6 cylinder use the same 91mm bore spacing sans M30/S38 and related "big sizes" so i would expect any of the headers would align once you fixed the bolt pattern issue as i dont think...

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This is an interesting project....

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The longitudinal tabs are already in effect gusseted by the lateral piece (connecting the two tabs) that forms a C-channel in plan view and realistically i don't think these significantly affect/stiffen...

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Firstly i find it hard to differentiate feeling/definition of tramlining vs bump steer and reading up hasn't helped this as it is hard to know who is an authority on it and who isn't and is just paroting/perpetuating...

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how did you measure the bumpsteer on alignment rack? i am revisiting this and will take some more measurements...

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This is useful info, is there a diagram showing the white C2 and C1 pin numbering positions? i want to test LH indicator function off the car
I gather apply power to Pin 7 of C2 and ground to Pin...

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How do you know it is full rich ?

put the stock injectors back in...

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probably address the fuel pressure. The fuel pressure should be 3b for m20b25 (43psi w.r.t reference, so depending if idling ~37psi due to vacuum or 43 psi @ WOT ) and this is the pressure as measured...

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i had what might be a somewhat similar issue when i change my e30 188 diff, the output flange wasn't properly seated so would pop out i just has to bang in it fully home

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looks like the bitch tube o-rings not the dipstick...

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can someone remind me if there an o-ring in the block where tube slides in? if so what is the size?

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The positive pressure is caused by the blowby entering the crankcase and not being able to escaping without significant resistance plus some action caused by the piston pumping action inside a "closed"...

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i have had 3 alignment checks done by shops (laser or whatever they fancy machines that they all use) and they all showed notably different results at the rear though two are somewhat consistent. i had...

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The two are always lightly coupled because the pivot axis is 15 degrees from a perfect transverse axis. if the axis was perfectly transverse then adjusting camber would not affect toe one iota
...

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https://youtu.be/dTP-o11B4os?si=t-tgKY6K41NBuviP

shows the use of a smaller 1/12" (instead of 14x20) non braided hose which appear to have made it easier to slide due to physical size...

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I dont think that lowering is going to correct 1mm per side without adjusters based on the numbers in e30sport.net

you can of course add 1mm offset OE rubber bushes (outer or inner/outer)...