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<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 2px solid; 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 2px solid; 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 2px solid; 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>