Hi Bernd,
Hum, not quite sure about that one as I'm not currently familiar with how
the PCM normally deals with this. Off hand, I'd suspect it would work fine
as the PCM would normally be computing this anyway. Let me see what I can
find out.
Rich
-----Original Message-----
From: bernd@texas.net [mailto:bernd@texas.net]
Sent: Tuesday, July 10, 2001 6:43 AM
To: dakota-truck@buffnet.net
Subject: RE: DML: MAP Adjuster Works! :'B
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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