[Diy_efi] Low impedence injector flowbench and other flowbench Q's

dustin allmaras PrecisionFuelInjection
Wed Aug 23 21:20:58 UTC 2006


Looking for some advice on building a flowbench. I've built a simple injector flowbench that will comparison flow up to 8 high impedence injectors. It's powered by a megasquirt ECU and stimulator.

I need to run both high impedence and low impedence injectors in the flowbench and while I don't want to ask megasquirt questions here since there's a website specifically for that, I'm leaning towards getting rid of the MS and rigging up an OEM ecu or two that will run the flowbench. All I really need is for a set of  injectors to pulse for simple comparison flowtesting. I've been fumbling with the idea of using two different ECU's, one for high impedence and one for peak and hold injectors and faking all the required ECU inputs to get it to function well enough to fire injectors. I'm familiar with the Ford EEC-IV computers and would probably use one for the high impedence injectors, but I've never worked with anything peak and hold before. I need to fire 8 injectors at the same rate, preferrably batch and wondering if anybody could suggest an ECU that isn't too difficult to work with that might handle the task for peak and hold injectors. I figured the tach or engine position signal to the ecu would be the most difficult and necessary input to reproduce without an engine, but I'm not against spinning a distributor or cam sensor, etc with a small electric motor for the time being. Could I fire low impedence injectors from an EEC-IV computer with injector resistors?

Any thoughts on the issue would be most appreciated.

Another question is regarding firing a strobe or timing light to view injector spray patterns. Anybody know a simple way to fire a strobe from an injector pulse?

Finally, Anybody have an idea or known, simple solution for an inexpensive, accurate adjustable (15-80 psi) fuel pressure regulator? I'm using mineral spirits for a test fluid if it makes a difference.

Please help! Thanks for your time!

Dustin



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