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RE: Changing 165 / Nother Q

To: "'gmecm@diy-efi.org'" <gmecm@diy-efi.org>
Subject: RE: Changing 165 / Nother Q
From: Mike Rolica <mrolica@meridian-mag.com>
Date: Tue, 20 Jun 2000 14:28:38 -0400
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-----Original Message-----
From: Dave Zug [mailto:dzug@delanet.com]
Sent: Saturday, June 17, 2000 4:07 AM
To: gmecm@diy-efi.org
Subject: Re: Changing 165 / Nother Q


400000000000000000 / 256 =3D 156250000000000 (close)  G/S per single =
unit of
resolution on the sensor....

Your point is understood,  but I'd use MAP for the jet engine ;-)

converting to 16 bit would be useful only if the sensor range was also
raised.  If you turn an 8 bit value into a 16 bit, it just gives you =
the
ability to see the sensor value as more tiny-er steps... not higher =
values.
you would have to change the sensor range at the same time to be able =
to
read more air.  (9 bits will get you to 512 steps,  BTW).  sorry this =
may be
out-of-place rambling, I don't understand how this is done very easily. =
IN
the code, the A2D would see a maxxed input, translate to FFh, and that =
may
trigger some creative code to say "go to the high table" but the input =
still
will be pegged.  you'd almost have to electronically reduce (re-scale) =
the
voltage input from the MAF to the ECM, then allow the internal 9-bit =
(16
bit) value to read 255 when the voltage level was at 4v or something,  =
then
have the internal 9-bit read 320 at 5v... a second "high" table would =
have
entries that were up to (320 minus 255), and would be in use only when =
the
"high flow" bit (9th) was lit.


	yes this is why it is taking so long...
	ps the maf will read up past 255g/s  actualy if you apply 10v
(safely  it will go from 	20g/s 	to 620g/s @ 9.8v  tested on flow
bench... will post the excell graph...=20

	finer resolution is good,, could help eliminate some of the lag that
bruce is talking 	about.



oooh my brain, the POOR '165  ;-)  Please, as always... someone add /
correct me so I don't confuse others browsing the archives.

I have used the RPM based fuel tweak to compensate for what the MAF =
can't
see.  Its a trial and error method, but I got it to work out when I had =
the
Supercharger on.  I started reeeal rich, and used o2 to make sure I =
wasn't
lean, but I should have backed it up with an EGT.

Makes sense to me that if you can increase the size of the MAF (not =
saying
anything new here) that the readout for a given flow rate will decrease
exactly proportionally with the increase in orifice area.  the big job =
is to
go thru EVERY calculated value (on chip) and every comparison made to =
those
values, and adjust them accordingly.  i.e.  trip into PE mode at a MAF =
value
of 40(d) insted of 55(d) because now 40 represents 55 g/s and 255 =
represents
320 g/s (or whatever math...)

To MY Question:

Has anyone scientifically measured the effect on readings between an
unported, stock, screened MAF and a ported (no sink) and un-screened =
MAF? I
figgered roughly the percentage of area opened up, and a little tweak =
for
the reduction in air turbulance and went with that to re-calibrate the =
MAF
tables. I figgered a shop vac and a y-pipe and a volts meter would give =
a
ratio as well.  anyone done it?  share?  of coarse the voltage reading =
will
be lower for the gutted MAF,  but it would be cool to have a graph of =
each
at all flow levels ;-))

got one will post.. been nusy.. had wisdom teeth pulled.. ouch  look =
like
chipmunk...
but once this is done.... i will pass to everyone.. then it becomes =
easy esp
for guy who wants to "stick " a huffer on it.. :)

----- Original Message -----
From: Mike Rolica <mrolica@meridian-mag.com>
To: <gmecm@diy-efi.org>
Sent: Thursday, June 15, 2000 1:05 PM
Subject: RE: Changing 165 fuel delivery was "General tuning question - =
fuel
economy"


Argggg.. yes it can pull in 40000000000000000000times more air  but as =
long
as you are in the range of the maf... ie below it's max sensing cap ie =
254
g/s  then the maf is fine.

Senario 2.. lets say at 2500rpm  and =BD throttle, and you are pulling =
255g/s
then the ecm thinks this is max air it can get....so it cant regognize =
and
more air.... That is why I would like to create a patch to use either 2
tables or go 16 bit!!!!


<BIGSNIP>

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