Correct mapping for Camshafts

[Programmer]

Mike,

Thanks a million--this guy lives about 2 hours away, so I've got to deal
with this thing long distance. I'm going to burn 3 chips and send them off
with varying maps--and try to get the whole rig to the shop to do the final
fine tuning.

Thanks a million...

Lyndon.
-----Original Message-----
From: ECMnut at aol.com <ECMnut at aol.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: October 26, 1999 7:39 PM
Subject: Re: Correct mapping for Camshafts


>That's a bummer..   MAP & vacuumm killing cams
>can be a PITA.  I went through this with my Syclone.
>and found a table referred to as
> "F29E Base Pulse VE vs RPM And MAP (Closed Throttle)"
>Thought this was the silver bullet to fix a low idle vac problem...
>It help some, but hindsight showed that I should've read more first.
>If I had only gone a few byte farther, I would have found the
> "F30, Base Pulse VE vs RPM"  I just reduced the first 6 values
>of the 15 byte table from all 31's to 24,25, 26, 27, 28, 29  as a rough
>guess to compensate for what the cam did to low rpm efficiency..
>I got lucky..  It worked well...   Use block learn as your seing eye
>dog for rich vs lean..  If it is much higher than 128, you need to lean
>things out.  Much lower, and you need to fatten..  You'll need to lean.
>My numbers were in the basement (90's)..
>Mike V
>
>>  Right now, the guy has put a Comp Cams 280H (.480 Int/exh and 280
degrees
>> duration) in his bone stock truck engine, has only 14" vacuum at idle (
>> needless to say his truck is really overfueling). Runs like crap till
>around
>> 3000 RPM because of the overfueling. Only other modification on the truck
>is
>> headers and a dual exhaust.
>>