[Gmecm] EGT tuning (was BIG CAM TUNING)
David Cooley
n5xmt
Sat Jun 18 20:38:45 UTC 2005
I haven't, but people I know that do dyno tuning say at least an A/F and
dyno, EGT helps dial in timing after the A/F is set
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Robert Fleming
> Sent: Saturday, June 18, 2005 2:23 PM
> To: gmecm at diy-efi.org
> Subject: RE: [Gmecm] EGT tuning (was BIG CAM TUNING)
>
> Have you done much dyno tuning with an EGT? Sounds like a
> good idea but I've talked to a few people who dyno tune all
> the time and say its sort of worthless unless you run an EGT
> at each exhaust port.
>
> Robert
>
>
> --- David Cooley <n5xmt at bellsouth.net> wrote:
>
> > Your best bet, so you don't blow the engine is to use a
> wide band A/F
> > meter, EGT guage and a dyno
> >
> >
> > > -----Original Message-----
> > > From: gmecm-bounces at diy-efi.org
> > > [mailto:gmecm-bounces at diy-efi.org] On Behalf Of
> > zach
> > > Sent: Friday, June 17, 2005 8:25 PM
> > > To: gmecm at diy-efi.org
> > > Subject: Re: [Gmecm] BIG CAM TUNING ON MAP
> > >
> > >
> > >
> > > ok thanks for the help but do i just guess at how
> > much
> > > advance and fuel to add?
> > >
> > >
> > >
> > >
> > > --- On Fri 06/17, < Djfreggens at aol.com > wrote:
> > > From: [mailto: Djfreggens at aol.com]
> > > To: gmecm at diy-efi.org
> > > Date: Fri, 17 Jun 2005 19:28:09 EDT
> > > Subject: Re: [Gmecm] BIG CAM TUNING ON MAP
> > >
> > > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> > > <HTML><HEAD> <META
> > http-equiv=Content-Type
> > > content="text/html; charset=US-ASCII"> <META
> > content="MSHTML
> > > 6.00.2800.1498" name=GENERATOR></HEAD> <BODY
> > id=role_body
> > > style="FONT-SIZE: 10pt; COLOR: #000000;
> > FONT-FAMILY: Arial"
> > > bottomMargin=7 leftMargin=7 topMargin=7
> > rightMargin=7><FONT
> > > id=role_document face=Arial color=#000000 size=2>
> > <DIV> <DIV>
> > > </DIV> <DIV> i normally dont reply but i am
> > today. WTF are
> > > you talking about ?
> > > ive tuned sevral small blocks with very large
> > camshafts with
> > > no trouble unless there was excessive overlap like
> > more then
> > > 24degrees or so. youll need to work almost every
> > table in the
> > > ecm. youll need to rework fuel and spark and all
> > of the accel
> > > enrich tables along with the idle conditioners.
> > first things
> > > first start with the fuel tables. then work spark.
> > start
> > > conservative and dont be surprised if the engine
> > needs lots
> > > of spark advance dont in the low rpm low map
> > areas. </DIV>
> > > <DIV> </DIV> <DIV> </DIV> <DIV> </DIV> <DIV>
> > </DIV> <DIV>
> > > </DIV> <DIV>In a message dated 6/17/2005 6:38:52
> > P.M. Eastern
> > > Standard Time, dvfagan at yahoo.com writes:</DIV>
> > <BLOCKQUOTE
> > > style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
> > BORDER-LEFT: blue
> > > 2px solid"><FONT
> > > style="BACKGROUND-COLOR: transparent" face=Arial
> > color=#000000
> > > size=2>Zach,<BR>People with a "HUGE RACING CAM"
> > don't
> > > generally tune.
> > > <BR>Without decent manifold vacuum, all they
> > generally
> > > do<BR>is set the
> > > temperature to enter closed loop to
> > 255<BR>degrees (forcing
> > > open loop). Then
> > > they mechanically<BR>advance timing till the
> > knock detector retard
> > > becomes<BR>annoying. The O2 sensor controls
> > closed
> > > loop<BR>operation and
> > > can be ignored. Mechanically adjust<BR>your
> > fuel pressure
> > > up until you
> > > see black smoke out<BR>the back. Have fun and go
> > burn some
> > > fuel!!<BR>Dennis<BR><BR>--- zach
> > <fateo6 at excite.com> wrote:<BR><BR>>
> > > <BR>> <BR>> HI I CAN QUIET FIGURE OUT HOW TO
> > TUNE FOR A BIG CAM<BR>>
> > > ON A MAP SYSTEM. IM RUNING A 730 ECM WITH A $58
> > CODE<BR>>
> > > BUT I HAVE A HUGE
> > > RACING CAM AND I DONT KNOW WHAT<BR>> TABLE(S) TO
> > MODIFY OR
> > > HOW I GO ABOUT
> > > THAT; IS THE A<BR>> MATH FORMULA I SHOULD START
> > WITH? <BR>> THANKS
> > > <BR>> ZACH<BR></FONT></BLOCKQUOTE></DIV>
> > > <DIV></DIV>
> > > <DIV> </DIV></FONT></BODY></HTML>
> > >
> >
> <p>_______________________________________________<br>Gmecm
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