M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Swaps, Turbos, Buildups => Topic started by: Only1 on December 22, 2011, 03:36:57 PM
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Hi i'm building up my e36 m42 with turbo kit with Original Ecu without programing it and i'm searching for solution to increase fuel sprayed to engine becouse when turbo blows up to 0.5 bar fuel isnt enough and when you push the pedal maximum it doesnt work properly , tryed to fit in 740 injectors nothing changes, maybe its possible somehow to trick original ecu to spray more fuel or try to add Additional fuel injector to intake manifold? Is it possible somehow to canculate fuel mixture? and how much more fuel i need when pressure increases? I would be thankfull if someone could help me to find a solution to my problem. thanks (sorry for my english)
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You need fuel pressure regulator and wide band o2 sensor with gauge.
O2 will monitor your a/f ratio and fpr will be used to add extra fuel. You can use original injectors for it.
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Look up BEGI FMU, or RRFPR (rising rate FPR). These will increase fuel as intake manifold pressure rises.
These are NOT recommended options and you are much better off with some sort of management tuning.
Midnight Tuning does work for these cars on the original ECU. Might be worth contacting them if you don't want to use a standalone.
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1992 Saab turbo injectors are 22.64 lb/hr and work well for 5psi w/ no other mods. They provide approx. 12.5:1 air/fuel ratio @ WOT. These may get you close, then add other mods such as an intercooler and/or RRFPR for higher boost. Perhaps 7-8 psi.
Don't do anything unless you first have an accurate AFR meter. It is of UTMOST IMPORTANCE and will make it much easier to tune with less risk.