[Diy_efi] Re: (was: IAC counts) VE tuning issues
David Cooley
n5xmt at bellsouth.net
Sat Jan 1 15:20:07 GMT 2005
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I would still disable it while tuning... even if it diverts air to the
converter it can still affect the O2 readings.=0D
=0D
=0D
-------Original Message-------=0D
=0D
From: Mike Frels=0D
Date: 01/01/05 08:42:44=0D
To: A list for Do-It-Yourself EFI=0D
Subject: Re: [Diy_efi] Re: (was: IAC counts) VE tuning issues=0D
=0D
I was reading HELMS this morning(couldn't keep the eyelids open past 11:0=
0
last night) AIR should only inject into the exhaust manifolds when cold a=
nd
in open loop to help burn converter destroying unburned fuel. When it war=
ms
and goes closed the AIR should then divert to the converter. I interpret
this to mean the AIR system should have no influence on my 02 readings.=0D
=0D
Just the same I am going to double check for proper operation today. Hmmm=
=2E.
could I have switched the two connectors to the diverter valve last time =
I
reassembled after checking lifter preload?...I've done worse before!...=0D
=0D
I will report on progress as it happens. Yesterday's forecast for today w=
as
50% chance of rain.=0D
=0D
Happy New Year,=0D
Mike=0D
=0D
At 10:04 PM 12/31/2004, you wrote:=0D
=0D
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
=20
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<DIV>I would still disable it while tuning... even if it diverts air to t=
he converter it can still affect the O2 readings.</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> 01/01/05 08:=
42:44</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>I was reading HELMS this morning(couldn't keep the eyeli=
ds open past 11:00 last night) AIR should only inject into the exhaust ma=
nifolds when cold and in open loop to help burn converter destroying unbu=
rned fuel. When it warms and goes closed the AIR should then divert to th=
e converter. I interpret this to mean the AIR system should have no influ=
ence on my 02 readings.<BR><BR>Just the same I am going to double check f=
or proper operation today. Hmmm...could I have switched the two connector=
s to the diverter valve last time I reassembled after checking lifter pre=
load?...I've done worse before!...<BR><BR>I will report on progress as it=
happens. Yesterday's forecast for today was 50% chance of rain.<BR><BR>H=
appy New Year,<BR>Mike<BR><BR>At 10:04 PM 12/31/2004, you wrote:<BR>
<DIV class=3Dcite cite=3D"" type=3D"cite">that may be the problem... whil=
e tuning, plug the AIR system as it injects air to the exhaust like a gia=
nt leak...<BR> <BR> <BR><I>-------Original Message-------<BR></=
I> <BR><B><I>From:</I></B> <A href=3D"mailto:mfrels at ix.netcom.com">M=
ike Frels</A><BR><B><I>Date:</I></B> 12/31/04 21:54:09<BR><B><I>To:</I></=
B> <A href=3D"mailto:diy_efi at diy-efi.org">A list for Do-It-Yourself EFI</=
A><BR><B><I>Subject:</I></B> Re: [Diy_efi] Re: (was: IAC counts) VE tunin=
g issues<BR> <BR>Don't you mean 'injectors are much SMALLER than #24=
they are supposed to be?'<BR> <BR>Anyway as far as oxygen getting i=
nto the exhaust stream the only thing I<BR>have really checked is proper =
AIR system operation. That is working as it<BR>should. I have not re-chec=
ked that exhaust manifold bolts since spring when<BR>I put the engine in.=
Yes, I am still running cast iron manifolds. I will<BR>take a wrench to =
the exhaust bolts and nuts tomorrow. Thanks for that<BR>possible pointer.=
<BR> <BR>The injectors are brand new Accel 24 pounders. No, I did no=
t have them<BR>flowed before installing as I believed I could trust them =
from the factory.<BR>Is experience counter to this?<BR> <BR>Mike<BR>=
<BR>At 05:59 PM 12/31/2004, you wrote:<BR>>I look at it this way=
: BLM's greater than 128 means the ECM is having to<BR>>add fuel=
to keep the mixture right. This means it's getting more air than<B=
R>>it should according to the VE tables, which means the table values =
need to<BR>>be raised by the appropriate factor. [(BLM/128)*curr=
ent VE] is a very<BR>>good formula for finding how much to adjust it.<=
BR>><BR>>If you're getting 160 BLM's and you have 80's in the low-r=
pm VE table,<BR>>then either your injectors are much bigger than the 2=
4# that you think<BR>>they are, or you have a pretty significant vacuu=
m leak, or you're getting<BR>>a false lean reading from the O2. =
First thing to do is check for exhaust<BR>>leaks before/near the O2, a=
s that will REALLY screw with your BLMs. Where<BR>>did you get t=
he injectors? Are they new or used, and have they been flow<BR>>=
tested?<BR></DIV>
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