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I'm doing a low boost(5-6psi) turbo set up and I've heard of many people just using a FMU and no type of engine management. Is it always necessary to use engine management with a low boost set up or will just a FMU and bigger injectors work good?
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What's a FMU?
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It's a fuel pressure regulator some people call it a FMU(fuel management unit)Comment
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Are you willing to tear up your engine? That's alot of time invested in your engine to just "get by" on the fuel management.Comment
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So is your statement based on experience?Comment
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There a many supercharged and turbo cars out there with FMU's in them. (my truck included) A FMU basically closes the return line with a vacuum operated valve, forcing the fuel through the injectors. Crude, but it works. They have different calibrations for different applications though.Comment
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I've seen the different kinds that are out there. I would need an adjustable FMU. Just curious if anyone has done it here without any type of engine management. I know it's been done before and it sounds reasonable going low boost with just the FMU. Of course other things would have to be adjusted along with the FMU.Comment
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MSD adjustable fuel reg, plus a 5th injector, a Cold Start unitOriginally posted by Brown-Boy
activated by an adjustable pressure switch, 4 larger injectors from
a Mustang, all fed by larger fuel pump. Around 8psi from a T25, eclipse BOV
Wide O2 plus EGT and A/F ratio gauges.
Need to know whats going on, rather than waiting for pinging/melted pistons.
Someday will do the Megasquirt, but this cheapy setup works
better than I'd imagined. Next stop is a Crane or MSD ignition box
and coil.
Could crank Boost higher, but liking where its at now. peppy,
yet don't need to worry about eating clutchesComment
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