[Gmecm] BIG CAM TUNING ON MAP

Sat Jun 18 02:44:25 UTC 2005

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
>