[Diy_efi] Low impedence injector flowbench and other flowbench Q's
Wed Aug 23 23:55:23 UTC 2006
im no expert by any means, but wouldnt a 555 or simple power supply
with some switches be easier?
On 8/23/06, Bill - Comcast <b.shaw at comcast.net> wrote:
> Hi Dustin,
> The 1227749 SyTy/Sunbird ECM will run both P& H and saturated injectors
> with a simple jumper change. There are a number of '749 equivalent
> GMECMs available, the last one I got was a 16198263 that came from a
> quad-4 I believe.
> Here's a link to my ECM test bench...
> Ryan Hess here on the list is designing a PCB for use in an ECM test
> bench that could supply RPM and other signals you'd need.
> I've been thinking about building an injector flow bench so I'd be real
> interested in seeing what you come up with. It's easy to add to the
> twiki to share your work with the rest of us!
> dustin allmaras wrote:
> > 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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