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Re: Ford injectors (& Question) MORE



> Thanks for the verivication!
>
> The heads are Dart (Jegs cat 11311111) Pro-1 Alum, angled plugs, 200cc
> intake runners, 2.02 / 1.60. Yea, I know.. you don't have to say it.

OK,
but what cc are the chambers?.

> Perhaps a superram is in my furure and still the head's intake runners are
> too large.

Velocity velocity velocity.
I made 320 easily with the oem vette ones at 175
But, I think Mike R is running some largish ones,  with good numbers.

  10:1 CR and pump gas on nearly the stock ARAP binary (lots of
> timing removed from 3400 to 4600 at high load) . full roller setup L98
> block, Timing at WOT is 19 19 18 18  with a 10 degree base setting.

Afterr rereading this, must be a smaller chamber head which is about what I
was running.

 One
> point seven five 60 foot time on 8.5 inch BFG drags. TORQUE TORQUE TORQUE
> I can stick with the 11 second 'trailer queens' for about 100 ft   :-))

That's why I watch MPHs

> More tuning and I'll be brave anough to post the binary.  Latest adventure
> is quickening the knock restore, and applying anti-launchspin tweaks for
> that mindless 'just nail it' take off.

Is there any other?...
Bruce
>
>
>
>
> ----- Original Message -----
> From: Bruce Plecan <nacelp@bright.net>
> To: <gmecm@diy-efi.org>
> Sent: Monday, August 21, 2000 7:09 PM
> Subject: Re: Ford injectors (& Question) 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!
> >
> > Yep.
> >
> > > 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???
> >
> > 10 at 6K rpm, means your in trouble as well as 20 msec at 3K rpm
> > Your DC (assuming your math is right) is fine.
> > What heads, max timing ya running?
> > Bruce
> >
> >
> >
> > > 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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> > >
> >
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