[Gmecm] BIG CAM TUNING ON MAP

[Djfreggens at aol.com]

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. 
 
 
 
 
 
In a message dated 6/17/2005 6:38:52 P.M. Eastern Standard Time,  
dvfagan at yahoo.com writes:

Zach,
People with a "HUGE RACING CAM" don't generally tune.  
Without decent manifold vacuum, all they generally do
is set the  temperature to enter closed loop to 255
degrees (forcing open loop). Then  they mechanically
advance timing till the knock detector retard  becomes
annoying.  The O2 sensor controls closed loop
operation and  can be ignored.  Mechanically adjust
your fuel pressure up until you  see black smoke out
the back. Have fun and go burn some  fuel!!
Dennis

--- zach <fateo6 at excite.com> wrote:

>  
> 
> HI I CAN QUIET FIGURE OUT HOW TO TUNE FOR A BIG CAM
>  ON A MAP SYSTEM. IM RUNING A 730 ECM WITH A $58 CODE
> BUT I HAVE A HUGE  RACING CAM AND I DONT KNOW WHAT
> TABLE(S) TO MODIFY OR HOW I GO ABOUT  THAT; IS THE A
> MATH FORMULA I SHOULD START WITH? 
> THANKS  
> ZACH




-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.diy-efi.org/pipermail/gmecm/attachments/20050617/21b8a821/attachment.html