[Diy_efi] Holley projection help needed

[Shannen Durphey]

If the calibration in software is expecting a 2BAR sensor and a 1BAR 
sensor is installed, the key on engine off pressure reading would be 
approximately double the expected value.  The 1-5 V output of the sensor 
must be scaled for the expected pressure range.  As someone else 
suggested, you might make sure your calibration and sensor agree.

Shannen




Jeff Behrens wrote:
> The orange wire on mine is the supply wire that reads
> 4.8 volts with the engine off.  The signal from the
> map sensor is 4.4 in the same condition.  I made a
> voltage divider tonight and dropped the voltage down
> to 2.5 on the suppply side and the truck actually ran.
>  It really leaned things out.  The system is still
> very unstable as it keeps changing state from idle to
> decel and run.  If any body has any experience with
> projection I could really use some advice.
> 
> 
> Jeff
> Automation specialist
> --- Joe Lutz <joeelutz at hotmail.com> wrote:
> 
>>It sounds like maybe you have two of the three wires
>>going to the map sensor 
>>reversed or you have the wrong sensor.  Is it a one
>>bar sensor?  On the 
>>sensor one wire is 0V, another should be ~4.8ish V
>>and the middle wire is 
>>the wire returning the signal to the ecm.  It may be
>>at ~2v with the sensor 
>>pluged in.  Possible this is what they are talking
>>about.
>>
>>Joe
>>
>>
>>
>>>From: Jeff Behrens <jwg94 at yahoo.com>
>>>Reply-To: List for general do-it-yourself EFI talk
>>
>><diy_efi at diy-efi.org>
>>
>>>To: diy_efi at diy-efi.org
>>>Subject: [Diy_efi] Holley projection help needed
>>>Date: Mon, 2 Jun 2003 07:45:36 -0700 (PDT)
>>>
>>>I purchased a holley projection 4di system and am
>>>having some issues with it.  My map sensor reading
>>>with the key on ignition off is 192 kpa, the book
>>
>>says
>>
>>>it should be 101.  It also states the voltage to
>>
>>the
>>
>>>sensor should be 2 volts with the koio.  Mine reads
>>>4.8 volts.  The other problem I am seeing is the
>>>system is constantly changing states between idle,
>>>run, and standby making the idle terrible.  Any
>>
>>help
>>
>>>would be appreciated.
>>>
>>>
>>>Jeff
>>>
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>>
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