 adjust mixture for different elevations, variable mixture control for higher elevations |
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| redflagmaclo |
 Jun 2 2022, 12:09 PM
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#1
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I'm new here ... Group: Members Posts: 0 Joined: 13-May 22 From: winston-salem, nc Member No.: 26,544 Region Association: South East States  |
I’m wondering if anyone has reccomendations on how to splice/add a variable resistance potentiometer in the main electric line from the manifold pressure unit to the ECU.. I’m going to be spending a lot of time in the Santa Fe/Los Alamos NM area which covers 5000’ to 7800’ elevations. I need the ability to lean the mixture as I travel from 1000’ MSL to over 8000’. My son and grandkids live there and I can now spend quality time with them and I make 2 visits a year from NC. I’m the original owner of a ‘74 2 liter and have just become a member of this group. Wish I had joined a long time ago.
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| TheCabinetmaker |
Jun 2 2022, 12:49 PM
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I drive my car everyday  Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
I've driven all over that area. Never had any problems with my djet.
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| brant |
Jun 2 2022, 01:58 PM
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#3
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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unless your running a wide band AFR read out.
not sure I'd mess with the mixture the system self adjusts somewhat for altitude already and the risk of damage from turning it lean... by the seat of your pants... would worry me. the motors like to run lean... feel good when they are lean... right up to the point that damage occurs. |
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| StarBear |
Jun 2 2022, 02:06 PM
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#4
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Senior Member Group: Members Posts: 1,885 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States
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Wow, another original owner! That makes maybe 7-8 of us.
Welcome aboard! (IMG:style_emoticons/default/biggrin.gif) |
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| JeffBowlsby |
Jun 2 2022, 03:49 PM
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#5
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914 Wiring Harnesses Group: Members Posts: 8,509 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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D-Jet automatically adjusts for differences in atmospheric pressure. One of the great things about D-Jet.
The MPS mechanically compares intake air manifold pressure to atmospheric pressure to determine its sensor output value (inductance) which is delivered to the ECU as a factor in determining the fuel injection pulse width. |
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| mgphoto |
Jun 2 2022, 04:19 PM
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#6
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
You could add a potentiometer to the head temp sensor but you would need an AFR meter to track fuel ratios to prevent the engine from damage running lean, as stated the MPS is well suited to compensate for changes in altitude.
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| 914sgofast2 |
Jun 2 2022, 08:19 PM
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#7
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Senior Member Group: Members Posts: 617 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
QUOTE(JeffBowlsby @ Jun 2 2022, 02:49 PM)  D-Jet automatically adjusts for differences in atmospheric pressure. One of the great things about D-Jet. The MPS mechanically compares intake air manifold pressure to atmospheric pressure to determine its sensor output value (inductance) which is delivered to the ECU as a factor in determining the fuel injection pulse width. WOW! That’s great to know. So if I drive up to Lake Tahoe from Sacramento then my 1.7L should make it? |
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| mgphoto |
Jun 2 2022, 10:30 PM
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#8
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
QUOTE(914sgofast2 @ Jun 2 2022, 07:19 PM) QUOTE(JeffBowlsby @ Jun 2 2022, 02:49 PM) D-Jet automatically adjusts for differences in atmospheric pressure. One of the great things about D-Jet. The MPS mechanically compares intake air manifold pressure to atmospheric pressure to determine its sensor output value (inductance) which is delivered to the ECU as a factor in determining the fuel injection pulse width. WOW! That’s great to know. So if I drive up to Lake Tahoe from Sacramento then my 1.7L should make it? Not a problem, it was built to do just that. |
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| TheCabinetmaker |
Jun 3 2022, 06:18 AM
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#9
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
QUOTE(StarBear @ Jun 2 2022, 03:06 PM) Wow, another original owner! That makes maybe 7-8 of us. Welcome aboard! (IMG:style_emoticons/default/biggrin.gif) Owner since 73! |
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