Rich,
How does it compensate for other altitudes? (MAP voltage changes)
COOL Deal though!! :)
- Bernd
> Hi Bob,
> The MAP feeds vacuum information back to the PCM in the form of a voltage
> level. It used this level to determine the engine load, and adjust the
> amount of fuel being delivered accordingly. With my cam only drawing 11" of
> vacuum, the PCM was receiving a voltage of approximately 2.8v. I built a
> voltage divider to insert between the MAP sensor and the PCM. I then
> adjusted the divider circuit to deliver an approximate voltage of 1.9v to
> the PCM, so it thinks it is drawing 16" of vacuum instead of 11".
>
> Now it doesn't flood out when you take your foot off the throttle. The
> beauth of this is that the divider does not provide a constant fixed
> voltage. It varies just like it normally would with the changing conditions
> of the engine. All it does is offset the voltage level back to the PCM.
> Best of all, it can be made to work on any engine.
>
> Here's something else real cool about the "adjuster". Since it's
> adjustable, you could use it to curve your fuel delivery to pass an
> emissions test if you ever fail one. What you wind up doing is leaning out
> your mixture to correct an overly rich condition. Real sweet, hun?
> Rich
>
>
> -----Original Message-----
> From: Bob Tom [mailto:tigers@bserv.com]
> Sent: Tuesday, July 10, 2001 10:43 AM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: MAP "Adjuster" Works! :'B
>
>
> At 09:35 AM 7/10/01 -0400, you wrote:
> >Just wanted to report the initial results on my MAP "Adjuster". As you may
> >recall I had a vacuum problem after installing a high lift cam in the 'ol
> >318. After some early setbacks, I can happily report the Dak is street
> >worthy now and definetly has an "attitude" to go with it. -- SNIP --
>
> Hey, Rich
>
> I'm glad to hear that you solved your vacuum problem!
> Now, you can reap the benefits of that MPI-matching,
> wild cam.
>
> What does this MAP "adjuster" exactly do? Thanks.
>
> Bob
>
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