[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: BPW numbers
This is a multi-part message in MIME format.
------=_NextPart_000_002C_01BF7E36.16CB01C0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
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.
Lyndon
-----Original Message-----
From: Programmer <nwester@eidnet.org>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: February 23, 2000 8:06 AM
Subject: Re: BPW numbers
=20
=20
Thanks for the info Dave,
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.=20
Here's some more specs...Cam duration 283 INT and 286 EXH, Intake =
lift is .435=20
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...=20
=20
Lyndon.
-----Original Message-----
From: Dave Zug <dzug@delanet.com>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: February 22, 2000 9:35 PM
Subject: Re: BPW numbers
=20
=20
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 =3D 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)
=20
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 =3D =
21.66 amazingly... keeps the injectors below something like 80% of max =
duty cycle.
=20
and you're "off road" so no problem with the feds.
=20
Please anyone correct anything. I'm not a pro, I just play one =
on TV.
=20
PS - my soon to be dropped-in 383 will start out with 350 =
injectors. (MAF too).=20
----- Original Message -----=20
From: Programmer=20
To: gmecm@diy-efi.org=20
Sent: Tuesday, February 22, 2000 4:46 PM
Subject: BPW numbers
=20
=20
Greetings guys,
=20
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 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 ?
=20
Lyndon.
------=_NextPart_000_002C_01BF7E36.16CB01C0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 =
HTML//EN"><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<META content=3D'"MSHTML 4.71.1712.3"' name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT color=3D#000000 size=3D2>Thought I'd keep ya'll up to speed. =
I added 12=20
points to the fuel map from 50kpa through 100 and from 1200 RPM +. This =
brought=20
the BL #'s right in the green at 128-129. I also added 4-8 degrees of =
spark at=20
varying areas...now this little rig really honks !! The customer is all=20
grins.</FONT></DIV>
<DIV><FONT size=3D2>Lyndon</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: =
5px">
<DIV><FONT face=3DArial size=3D2><B>-----Original =
Message-----</B><BR><B>From:=20
</B>Programmer <<A=20
=
href=3D"mailto:nwester@eidnet.org";>nwester@eidnet.org</A>><BR><B>To: =
</B><A=20
href=3D"mailto:gmecm@diy-efi.org";>gmecm@diy-efi.org</A> <<A=20
=
href=3D"mailto:gmecm@diy-efi.org";>gmecm@diy-efi.org</A>><BR><B>Date:=20
</B>February 23, 2000 8:06 AM<BR><B>Subject: </B>Re: BPW=20
numbers<BR><BR></DIV></FONT>
<DIV><FONT color=3D#000000 size=3D2>Thanks for the info =
Dave,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>This thing =
(now that=20
I've got some other numbers)--runs at 154 BL at cruise. Idle is at =
132=20
(close enough) ---so I'm assuming WOT is going to be pretty lean.=20
</FONT></DIV>
<DIV><FONT size=3D2>Here's some more specs...Cam duration 283 INT =
and 286 EXH,=20
Intake lift is .435</FONT> </DIV>
<DIV><FONT size=3D2>and exhaust is .455. Compression ratio is 9.4 to =
1 and the=20
heads have been ported to match Vortec specs (this truck is a 1988). =
3.42=20
ratio diff is what we're working with--and actually the truck peels =
around=20
pretty good the way it is...we're just a little concerned about the =
lean=20
ratio at cruise and WOT. I'll try adding 15% across the upper end of =
the=20
fuel map to start with...</FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Lyndon.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; =
PADDING-LEFT: 5px">
<DIV><FONT face=3DArial size=3D2><B>-----Original=20
Message-----</B><BR><B>From: </B>Dave Zug <<A=20
=
href=3D"mailto:dzug@delanet.com";>dzug@delanet.com</A>><BR><B>To: =
</B><A=20
href=3D"mailto:gmecm@diy-efi.org";>gmecm@diy-efi.org</A> <<A=20
=
href=3D"mailto:gmecm@diy-efi.org";>gmecm@diy-efi.org</A>><BR><B>Date:=20
</B>February 22, 2000 9:35 PM<BR><B>Subject: </B>Re: BPW=20
numbers<BR><BR></DIV></FONT>
<DIV><FONT face=3DArial size=3D2>On a MAF system, if you UP the =
fuel=20
pressure 7 - 10 %, and set the flow rate to a value 7 - 10% =
higher,=20
the 305 injectors will have the best chance on a un-hotrodded =
350 motor=20
IMO. you can add 20% more FP and mess up idle and cause =
BLM=20
skewing, and the WOT will have more fuel, or you can leave the =
FP alone=20
and idle will be great but WOT may have the injectors static and =
still=20
have low o2 readings. Either is a comprimise. 305 to =
350 =3D=20
bit more than 14% more air, need 14% more fuel and thats with no =
other=20
intake mods. If you were using 12ms at WOT on the 305 you'll use =
the=20
same injectors 14% longer in the 350 - closer to static (or=20
over)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>dont just change the BPW by =
14%, (in a MAF)=20
you'll do the opposite of what you are after. the injector base =
PW=20
should be the actual setting for the injectors used - then you =
adjust it=20
a bit for more FP.. which makes the injectors have a higher flow =
rate=20
than they are "stamped". a better spray pattern =
too. On=20
a TPI (not TBI) each of the 8 are rated at 19#/hr for a 305 and =
22#/hr=20
for a 350. 19 * 1.14 =3D 21.66 amazingly... keeps the injectors =
below=20
something like 80% of max duty cycle.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>and you're "off road" =
so no=20
problem with the feds.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Please anyone correct anything. =
I'm not a=20
pro, I just play one on TV.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>PS - my soon to be dropped-in =
383 will=20
start out with 350 injectors. (MAF too). </FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:nwester@eidnet.org"=20
title=3Dnwester@eidnet.org>Programmer</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:gmecm@diy-efi.org"=20
title=3Dgmecm@diy-efi.org>gmecm@diy-efi.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, =
February 22,=20
2000 4:46 PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> BPW =
numbers</DIV>
<DIV><BR></DIV>
<DIV><FONT color=3D#000000 size=3D2>Greetings =
guys,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Just wondering what BPW =
numbers=20
would do when a guy changes a 305 to a 350. The 1988 TBI =
injectors=20
are different, PROM BPW numbers are 148 for a 305 and 135 =
for=20
</FONT><FONT color=3D#000000 size=3D2>a 350. This is based =
on flow in=20
grams/sec...what would you have to set a 305 injector to, to =
work in=20
a 350 properly -- or is the flow rate too low already =
?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000=20
=
size=3D2>Lyndon.</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BOD=
Y></HTML>
------=_NextPart_000_002C_01BF7E36.16CB01C0