Injector Confusion

[Mike Swayze]

this may be somewhat totally unrelated but does the vacuum hookup on the
fuel regulator on the 
analog setup in the previously discussed caddy-olds(bendix) perform a
similar function?
curious
Mike





At 06:27 AM 11/12/1999 -0600, you wrote:
>YES, there are some real junk ones (FMUs)!!.
>Yes, you have to be 10x more "expert" on fuel system capacity/pressure.
>(Also, why I kept saying -10 for supply, and -6 (MIN) return).  You have to 
>have things right for high demand.  This using pressure for quanteeing fuel 
>delivery is an evil item in my book.  I can not justify the math/science in 
>it, but it does work.  When ya get really really picky you can pick up fine 
>points, ie, on one bypass system I was changing the bypass hole .003-.005" 
>at a time.  Took probably 20 passes to get just that right..
>But, there is no other way to get the "dynamic" range out of an injector.
>They are "new" to the market, and I hope things get better, I have heard 
>of a limited production one, that is supposed to be right.
>  I'd just much rather use a longer on time, I've seen some injector flow
>stuff for short injector pulses, and they all leave alot to be desired in my 
>book.  ANYTHING, that can be done to hold an injector on like 1.6+msec., at 
>idle is worth it as a min. for what I've seen.
>  This trying to get a decent idle at 1.1s is just too much grief, or maybe 
>I'm getting old.
>Grumpy
>  You numbers may vary, my stuff ain't what you'd call lab grade.
>What's an, INSTAAFL?.
>
>
>At 12:19 AM 11/12/99 -0500, gmecm at efi332.eng.ohio-state.edu wrote:
>>Bruce,
>>I have some experience with these with FMUs on supercharged/turbocharged
>>applications, and I hate 'em.  IME, they are unreliable, not very linear,
>>and not very repeatable.  They depend on restricting the return line for
>>their pressure rise, and what happens at WOT?  You're using most of your
>>fuel and not returning much, and the pressure drops...Boom.  We just pitched
>>the one on my friend's Powerdyne supercharged BMW 2002 , and the fuel curve
>>is much more consistent without it.  We did have to go up considerably on
>>injector size; TNSTAAFL, you know.
>>
>>Kendall Frederick
>
>