[Diy_efi] RE: Diy_efi Digest, Vol 18, Issue 27

[Cad Company Support]

Matco sells (or used to) an 'injector tester'. The one I have triggers 1
injector with a standard connector, and has 2 jumper leads to power it off
of the vehicle battery. There is no part number on it, and it is over 10
years old, but it was relatively cheap (and still works). It has 2 multi
position switches to handle various types of injectors. I suspect it was
made by OTC, and there is probably one that will trigger multiple units.
This one is smaller than a pack of smokes. JC Whitney used to sell a stand
alone ignition system in a briefcase sort of thing for under $150 - probably
useless for running an engine, but could be a good source for triggering
injectors. 
You may also want to check with an equipment supplier and see if you can get
a replacement injector pulse generator for your 8 unit OTC, RAM, etc
injector testing station. Might be cheap enough to be worth the labor
savings, but that would take all of the fun out of it. 

I'm thinking the EFI injector driver solution would want to be a batch fire
system, not SFI, especially if you want to look at the patterns with a
strobe...

If you can find an old timing light that triggers by a clip on the negative
side of the points coil at a flea market (makes me wish I'd asked for
Grandpas when they were cleaning out his old shop), it should trigger off
the negative pulse wire to an injector. 

If you use an injector driver that will run 10 injectors, one of the extras
could be used to drive your strobe without worrying if the strobe setup will
affect the injector operation. 

You could probably build the strobe out of a $10 Walgreen's camera. The
camera flash (Steve's idea) is a good idea IMHO, but external 35mm stuff is
pretty expensive. The last $10 Chinese 35mm I dropped, the glass lens flash
popped right out, and looked like a 2 wire hookup. Disposable cameras are
probably a plastic lens on the flash, which wouldn't last long in that
environment. 

CW

Message: 1
Date: Wed, 23 Aug 2006 14:20:58 -0700
From: "dustin allmaras" <PrecisionFuelInjection at msn.com>
Subject: [Diy_efi] Low impedence injector flowbench and other
	flowbench Q's
To: <diy_efi at diy-efi.org>
Message-ID: <BAY123-DAV4C225E87600AA4C23F8C7DE470 at phx.gbl>
Content-Type: text/plain;	charset="iso-8859-1"

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