<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=text/html;charset=iso-8859-1 http-equiv=Content-Type><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<META content='"MSHTML 4.71.1712.3"' name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT color=#000000 size=2>Dave,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT> </DIV>
<DIV><FONT size=2>This "was" a 305 TBI circa 1988 truck. PROM ID ADTC.
The new engine was a cam'd up 355 with 9.5 to one comp. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>LW</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 24, 2000 9:18 AM<BR><B>Subject: </B>Re: BPW
numbers<BR><BR></DIV></FONT>
<DIV><FONT face=Arial size=2>Increase the FP until the idle gets bad, see if
the BLM's come down.. only then would I change the fuel stuff cause you're
only masking the problem you'll have at upper load levels. increasing
the upper range wont do anything if the factory value plus the BLM addition
had the injectors static. static is the max and increasing the numbers
will show a longer PW on a scan but its mute. Fuel pressure first.. but
understand the down side. early on, Scott S pointed to me the
concept of static (injectors that is ;-) 31ms on a v-6 at 6000 rpm is like
TRIPLE redundant.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I'm thinking you should keep the fuel table
"personality" as stock as you can (dont change too large a range
to help a rich area get lean) , as long as you can. the heads will change
its shape some but the numbers should not have to change all in the same
direction - this indicates a problem with the FP or more correctly with the
injector sizing but we can play with FP to make an attempt. I think tuning
tips 101 says start with the fueling pig rich and tune DOWN. go read
that.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>you never said if this is a MAF or
not.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>make sure the injectors are clean.
go slowly into that good WOT.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Tuning for CAM I have never done except small
change to the buick.</FONT></DIV>
<DIV> </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> Wednesday, February 23, 2000
7:22 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: BPW numbers</DIV>
<DIV><BR></DIV>
<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></BLOCKQUOTE></BODY></HTML>