[Diy_efi] Re: (was: IAC counts) VE tuning issues
David Cooley
n5xmt at bellsouth.net
Sat Jan 1 04:07:00 GMT 2005
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that may be the problem... while tuning, plug the AIR system as it inject=
s
air to the exhaust like a giant leak...=0D
=0D
=0D
-------Original Message-------=0D
=0D
From: Mike Frels=0D
Date: 12/31/04 21:54:09=0D
To: A list for Do-It-Yourself EFI=0D
Subject: Re: [Diy_efi] Re: (was: IAC counts) VE tuning issues=0D
=0D
Don't you mean 'injectors are much SMALLER than #24 they are supposed to =
be?
=0D
=0D
Anyway as far as oxygen getting into the exhaust stream the only thing I=0D
have really checked is proper AIR system operation. That is working as it=
=0D
should. I have not re-checked that exhaust manifold bolts since spring wh=
en=0D
I put the engine in. Yes, I am still running cast iron manifolds. I will=0D
take a wrench to the exhaust bolts and nuts tomorrow. Thanks for that=0D
possible pointer.=0D
=0D
The injectors are brand new Accel 24 pounders. No, I did not have them=0D
flowed before installing as I believed I could trust them from the factor=
y.=0D
Is experience counter to this?=0D
=0D
Mike=0D
=0D
At 05:59 PM 12/31/2004, you wrote:=0D
>I look at it this way: BLM's greater than 128 means the ECM is having t=
o=0D
>add fuel to keep the mixture right. This means it's getting more air th=
an=0D
>it should according to the VE tables, which means the table values need =
to=0D
>be raised by the appropriate factor. [(BLM/128)*current VE] is a very=0D
>good formula for finding how much to adjust it.=0D
>=0D
>If you're getting 160 BLM's and you have 80's in the low-rpm VE table,=0D
>then either your injectors are much bigger than the 24# that you think=0D
>they are, or you have a pretty significant vacuum leak, or you're gettin=
g=0D
>a false lean reading from the O2. First thing to do is check for exhaus=
t=0D
>leaks before/near the O2, as that will REALLY screw with your BLMs. Whe=
re=0D
>did you get the injectors? Are they new or used, and have they been flo=
w=0D
>tested?=0D
=0D
_______________________________________________=0D
diy_efi mailing list=0D
diy_efi at diy-efi.org=0D
http://lists.diy-efi.org/mailman/listinfo/diy_efi=0D
=20
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<DIV>that may be the problem... while tuning, plug the AIR system as it i=
njects air to the exhaust like a giant leak...</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV id=3DIncrediOriginalMessage><I>-------Original Message-------</I></D=
IV>
<DIV> </DIV>
<DIV id=3Dreceivestrings>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>From:</B></I> <A href=3D"m=
ailto:mfrels at ix.netcom.com">Mike Frels</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Date:</B></I> 12/31/04 21:=
54:09</DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>To:</B></I> <A href=3D"mai=
lto:diy_efi at diy-efi.org">A list for Do-It-Yourself EFI</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Subject:</B></I> Re: [Diy_=
efi] Re: (was: IAC counts) VE tuning issues</DIV></DIV>
<DIV> </DIV>
<DIV>Don't you mean 'injectors are much SMALLER than #24 they are suppose=
d to be?'</DIV>
<DIV> </DIV>
<DIV>Anyway as far as oxygen getting into the exhaust stream the only thi=
ng I</DIV>
<DIV>have really checked is proper AIR system operation. That is working =
as it</DIV>
<DIV>should. I have not re-checked that exhaust manifold bolts since spri=
ng when</DIV>
<DIV>I put the engine in. Yes, I am still running cast iron manifolds. I =
will</DIV>
<DIV>take a wrench to the exhaust bolts and nuts tomorrow. Thanks for tha=
t</DIV>
<DIV>possible pointer.</DIV>
<DIV> </DIV>
<DIV>The injectors are brand new Accel 24 pounders. No, I did not have th=
em</DIV>
<DIV>flowed before installing as I believed I could trust them from the f=
actory.</DIV>
<DIV>Is experience counter to this?</DIV>
<DIV> </DIV>
<DIV>Mike</DIV>
<DIV> </DIV>
<DIV>At 05:59 PM 12/31/2004, you wrote:</DIV>
<DIV>>I look at it this way: BLM's greater than 128 means t=
he ECM is having to</DIV>
<DIV>>add fuel to keep the mixture right. This means it's g=
etting more air than</DIV>
<DIV>>it should according to the VE tables, which means the table valu=
es need to</DIV>
<DIV>>be raised by the appropriate factor. [(BLM/128)*curre=
nt VE] is a very</DIV>
<DIV>>good formula for finding how much to adjust it.</DIV>
<DIV>></DIV>
<DIV>>If you're getting 160 BLM's and you have 80's in the low-rpm VE =
table,</DIV>
<DIV>>then either your injectors are much bigger than the 24# that you=
think</DIV>
<DIV>>they are, or you have a pretty significant vacuum leak, or you'r=
e getting</DIV>
<DIV>>a false lean reading from the O2. First thing to do i=
s check for exhaust</DIV>
<DIV>>leaks before/near the O2, as that will REALLY screw with your BL=
Ms. Where</DIV>
<DIV>>did you get the injectors? Are they new or used, and =
have they been flow</DIV>
<DIV>>tested?</DIV>
<DIV> </DIV>
<DIV>_______________________________________________</DIV>
<DIV>diy_efi mailing list</DIV>
<DIV><A href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A></DIV>
<DIV><A href=3D"http://lists.diy-efi.org/mailman/listinfo/diy_efi">http:/=
/lists.diy-efi.org/mailman/listinfo/diy_efi</A></DIV>
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