[Gmecm] EGT tuning (was BIG CAM TUNING)

Sat Jun 18 18:23:03 UTC 2005

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
> 
> > mailing 
> >
>
list<br>Gmecm at diy-efi.org<br>http://lists.diy-efi.org/mailman/
> listinfo/gmecm<br>
> > 
> > _______________________________________________
> > Join Excite! - http://www.excite.com
> > The most personalized portal on the Web!
> > 
> > 
> > _______________________________________________
> > Gmecm mailing list
> > Gmecm at diy-efi.org
> > http://lists.diy-efi.org/mailman/listinfo/gmecm
> > 
> 
> _______________________________________________
> Gmecm mailing list
> Gmecm at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/gmecm
> 