I'm in the early stages of an S54 upgrade on my '95 E36 after dropping a valve and blowing up my S50 motor at Mid-Ohio earlier this year. The S54 I have to work with came without the plumbing for the sucking jet pump, shutoff valve or hoses running from the plenum to the venturi device or from there to the brake booster. Rather than buying the parts (another $200 or so on top of an already mounting bill), I'm considering just running vacuum hose from the big tube on the throttle body assembly to the brake booster.
I know the venturi device creates better vacuum and I'll have to have the valve coded out of the DME to avoid a CEL, but I'm wondering if anyone else has done this with a stock E36 M3 master cylinder and booster and whether there were any detrimental effects on braking under various street, autocross, or track conditions.
Thanks
'91 E30 318is - Dinan chip, K&N cone intake, GC coilovers/camber plates, Koni shocks, ST sway bars, Supersprint exhaust.
'95 E36 M3 - cosmos intake, 3.5" HFM, 24 lb. injectors, Vorshlag AST 5100 coilovers/camber plates, TMS sway bars, UUC exhaust.
Works fine for me, and for two other S54 E36 track cars that I maintain. In fact, I had to look up the jet pump on realoem to see what it was.
'95 M3 S54 Track Toy
'19 X5 40i M-Sport
'16 Cayman GT4
‘23 GR Corolla
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