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Originally Posted by diamondnik  Last week I looked at the car's original master cylinder, it is also stamped 23/20. I assumed that number pertained to something else, but now I see that my original 318ti MC was stepped as well (Canadian market Ti). I wonder what the relationship is between front and rear line pressure, and how it changes when increasing only front piston size... |
I have asked ATE for an explanation. I hope they respond....
Assuming our latest discoveries are correct (i.e. Ø=23.81/20.64mm) a stock 318ti/323ti has a static front bias of 66.59%. Replacing the stock master cylinder with one with diameters Ø=25.4/20.64mm (e36 m3 3.0 MC) the bias changes to 63.65% - i.e. the static front bias is moved approx. 3% to the rear.
The e36 m3 3.0 (assuming Ø=25.4/20.64mm) has a static front bias of 61.21%...
With e46 330i disc (325mm) and caliper (Ø=57mm) up front, stock ti' rear and m3 MC the static front bias of a ti' is 68.92%...
With e46 330i disc (325mm) and caliper (Ø=57mm) up front, stock ti' disc rear but caliper Ø=38mm rear and m3 MC the static front bias of a ti' is 63.97%...