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<DIV><FONT color=#000000 size=2>Thought I'd keep ya'll up to speed. I added 12
points to the fuel map from 50kpa through 100 and from 1200 RPM +. This brought
the BL #'s right in the green at 128-129. I also added 4-8 degrees of spark at
varying areas...now this little rig really honks !! The customer is all
grins.</FONT></DIV>
<DIV><FONT size=2>Lyndon</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
<DIV><FONT face=Arial size=2><B>-----Original Message-----</B><BR><B>From:
</B>Programmer <<A
href="mailto:nwester@eidnet.org">nwester@eidnet.org</A>><BR><B>To: </B><A
href="mailto:gmecm@diy-efi.org">gmecm@diy-efi.org</A> <<A
href="mailto:gmecm@diy-efi.org">gmecm@diy-efi.org</A>><BR><B>Date:
</B>February 23, 2000 8:06 AM<BR><B>Subject: </B>Re: BPW
numbers<BR><BR></DIV></FONT>
<DIV><FONT color=#000000 size=2>Thanks for the info Dave,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT><FONT size=2>This thing (now that
I've got some other numbers)--runs at 154 BL at cruise. Idle is at 132
(close enough) ---so I'm assuming WOT is going to be pretty lean.
</FONT></DIV>
<DIV><FONT size=2>Here's some more specs...Cam duration 283 INT and 286 EXH,
Intake lift is .435</FONT> </DIV>
<DIV><FONT size=2>and exhaust is .455. Compression ratio is 9.4 to 1 and the
heads have been ported to match Vortec specs (this truck is a 1988). 3.42
ratio diff is what we're working with--and actually the truck peels around
pretty good the way it is...we're just a little concerned about the lean
ratio at cruise and WOT. I'll try adding 15% across the upper end of the
fuel map to start with...</FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Lyndon.</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
<DIV><FONT face=Arial size=2><B>-----Original
Message-----</B><BR><B>From: </B>Dave Zug <<A
href="mailto:dzug@delanet.com">dzug@delanet.com</A>><BR><B>To: </B><A
href="mailto:gmecm@diy-efi.org">gmecm@diy-efi.org</A> <<A
href="mailto:gmecm@diy-efi.org">gmecm@diy-efi.org</A>><BR><B>Date:
</B>February 22, 2000 9:35 PM<BR><B>Subject: </B>Re: BPW
numbers<BR><BR></DIV></FONT>
<DIV><FONT face=Arial size=2>On a MAF system, if you UP the fuel
pressure 7 - 10 %, and set the flow rate to a value 7 - 10% higher,
the 305 injectors will have the best chance on a un-hotrodded 350 motor
IMO. you can add 20% more FP and mess up idle and cause BLM
skewing, and the WOT will have more fuel, or you can leave the FP alone
and idle will be great but WOT may have the injectors static and still
have low o2 readings. Either is a comprimise. 305 to 350 =
bit more than 14% more air, need 14% more fuel and thats with no other
intake mods. If you were using 12ms at WOT on the 305 you'll use the
same injectors 14% longer in the 350 - closer to static (or
over)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>dont just change the BPW by 14%, (in a MAF)
you'll do the opposite of what you are after. the injector base PW
should be the actual setting for the injectors used - then you adjust it
a bit for more FP.. which makes the injectors have a higher flow rate
than they are "stamped". a better spray pattern too. On
a TPI (not TBI) each of the 8 are rated at 19#/hr for a 305 and 22#/hr
for a 350. 19 * 1.14 = 21.66 amazingly... keeps the injectors below
something like 80% of max duty cycle.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>and you're "off road" so no
problem with the feds.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Please anyone correct anything. I'm not a
pro, I just play one on TV.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>PS - my soon to be dropped-in 383 will
start out with 350 injectors. (MAF too). </FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A href="mailto:nwester@eidnet.org"
title=nwester@eidnet.org>Programmer</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:gmecm@diy-efi.org"
title=gmecm@diy-efi.org>gmecm@diy-efi.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, February 22,
2000 4:46 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> BPW numbers</DIV>
<DIV><BR></DIV>
<DIV><FONT color=#000000 size=2>Greetings guys,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT> </DIV>
<DIV><FONT color=#000000 size=2>Just wondering what BPW numbers
would do when a guy changes a 305 to a 350. The 1988 TBI injectors
are different, PROM BPW numbers are 148 for a 305 and 135 for
</FONT><FONT color=#000000 size=2>a 350. This is based on flow in
grams/sec...what would you have to set a 305 injector to, to work in
a 350 properly -- or is the flow rate too low already ?</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT> </DIV>
<DIV><FONT color=#000000
size=2>Lyndon.</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>