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Re: Ford injectors (& Question) MORE
It has been said and I think I mostly understand the explanations...
Thus far I am still in total control of the AFR. safe at 0.93 then power
chip set down to 0.87 - 0.89.
using the o2 method, if the AFR is controllable that is, works but if you're
at 97% DC thats no good even though the o2's and the EGT says its fine....
least thats what I gather from reading, and like I've said before, I'm
reading more than I am 'doing' so no real experience going in.. so the
feedback is definetly appreciated!
Thanks carl.
PS - I'm still in search of that bargain blower ;-)
----- Original Message -----
From: Carl Summers <InTech@writeme.com>
To: <gmecm@diy-efi.org>
Sent: Monday, August 21, 2000 6:48 PM
Subject: RE: Ford injectors (& Question) MORE
> Hi,
> I can't get into the right/wrong stuff but can tell you programmable
pw
> and actual pw are different...I think this has been said before....If ya
> want to know whether you're getting maxed out....it's when the AFR starts
to
> not repeat...ttyl
> -Carl Summers
>
> Click on this link below to see the easiest way to handle internet
> transactions.
>
> https://secure.paypal.com/refer/pal=drsagan%40pacbell.net
>
> -----Original Message-----
> From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
> Of Dave Zug
> Sent: Monday, August 21, 2000 9:56 PM
> To: gmecm@diy-efi.org
> Subject: Re: Ford injectors (& Question) MORE
>
>
> Sorry to keep this going, but I have more:
>
> I analized the pulse widths that I am getting (383 CI TPI w/ stock 22#
> injectors, 360 HP est) verses the max PW for a range of RPM's (3600 -
5500
> : My "drag zone") and although I am seeing 13 ms pulses, they occur in an
> rpm range that allow a maximum of 16 msec thus my duty cycle times are
FINE!
>
> RPM/ MAX Allowable PW/ Measured PW /Measured Duty Cycle
>
> 3600 16.7 12.9 77.4
> 3750 16.0 12.3 76.875
> 3900 15.4 12.4 80.6
> 4050 14.8 12 81
> 4200 14.3 11.6 81.2
> 4350 13.8 11.2 81.2
> 4500 13.3 11 82.5
> 4650 12.9 10.8 83.7
> 4800 12.5 10.5 84
> 4950 12.1 10 82.5
> 5100 11.8 9.3 79.05
> 5250 11.4 9.2 80.5
>
>
> Conclusion: My stock 22# TPI injectors are correctly sized for my stroker
/
> large tube / header / 13.1 E.T. setup, even though I have PW's that are
over
> 10 ms.
>
> Right or Wrong???
> TIA (again)
>
>
>
> ----- Original Message -----
> From: Dave Zug <dzug@delanet.com>
> To: <gmecm@diy-efi.org>
> Sent: Saturday, August 19, 2000 2:19 AM
> Subject: Re: Ford injectors (& Question)
>
>
> > Thanks Roger.. I see my mistake. Much thanks.
> >
> > ----- Original Message -----
> > From: Roger Heflin <rah@horizon.hit.net>
> > To: <gmecm@diy-efi.org>
> > Sent: Friday, August 18, 2000 3:50 PM
> > Subject: Re: Ford injectors (& Question)
> >
> >
> > >
> > >
> > > On Fri, 18 Aug 2000, Dave Zug. wrote:
> > >
> > > >
> > > > So if I have this right, Let me write this in other terms...
> > > >
> > > > Lets say for example a car cruising is doing 5 ms pulses at a
constant
> > 6000
> > > > rpm (for math's sake).
> > > >
> > > > Its pulsing like this:
> > > >
> > > > each bit is 0.5 ms: (2 crank revs = 1 cam rev =20 bits). 20 ms time
is
> > > > represented (4 engine "strokes").
> > > >
> > > > 1111100000 1111100000 1111100000 1111100000 Left
> > > > 0000011111 0000011111 0000011111 0000011111 Right
> > > > <----------10 ms--------> <---------10 ms--------->
> > > >
> > > > Alternating left and right for HALF the PW time each 10 ms to
complete
> > the
> > > > full PW time within one CAM rev.
> > > >
> > > > Then we go to WOT and for math's sake lets say we gain no RPM's or
> > fueling
> > > > requirements.
> > > >
> > > > Its pulsing like this:
> > > >
> > > > each bit is 0.5 ms:
> > > >
> > > > 1111100000 1111100000 1111100000 1111100000 Left
> > > > 1111100000 1111100000 1111100000 1111100000 Right
> > > > <----------10 ms--------> <---------10 ms--------->
> > > >
> > > > Now to the (almost) REAL world.. Heres what WOT looks like (constant
9
> > ms
> > > > requirement) :
> > > >
> > > > each bit is 0.5 ms:
> > > >
> > > > 1111111110 1111111110 1111111110 1111111110 Left
> > > > 1111111110 1111111110 1111111110 1111111110 Right
> > > > <----------10 ms--------> <---------10 ms--------->
> > > >
> > > > The above example has the injectors on IN UNISON for a total of (0.5
> ms
> > *
> > > > 18) or 9 ms over each 10 ms (1/2 valvetrain cycle) period. the
listed
> PW
> > > > then repeats itself for the next 10 ms with no recalculation taking
> > place
> > > > (??) to complete the valvetrain cycle.
> > > >
> > > >
> > > > Do I have it right?
> > >
> > > Close, I believe they actually pulse the given pulsewidth at once, so
> > > when the computer says 9ms it actually opens it for 9ms, and then
> > > closes for 1ms, not (4.5ms, close .5, 4.5, close .5) On the
> > > sequential cars it would list 9ms as 18 ms, and keep it open for I
> > > believe the entire time or almost the entire cam rotation. I don't
> > > know if they alternate banks, I would need to look at the code to
> > > figure out that and how exactly it compares to the actual cylinder
> > > timing. My guess is that it may not really even match up consistantly
> > > with the cylinder timing, just close enough, I suspect also since the
> > > injectors have difficulties with being closed for short periods of
> > > time that that may be the reason to not even try to time single
> > > cylinder events, since this would required bigger injectors to avoid
> > > getting the close time too low.
> > >
> > > Roger
> > >
> >
>
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