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Need help with 3406E 3 wire fuel temp mod

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Slow302, May 26, 2018.

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  1. May 12, 2020 #11
    lwlevens

    lwlevens Medium Load Member

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    Well I figure how much hp are you really going to get? Is it worth doing? Like someone said cold fuel only.
     
    lwlevens, May 12, 2020
    lwlevens, May 12, 2020
    #11
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  3. May 12, 2020 #12
    little cat 500

    little cat 500 Road Train Member

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    its not worth messing with
     
    little cat 500, May 12, 2020
    little cat 500, May 12, 2020
    #12
  4. Jun 6, 2020 #13
    Slow302

    Slow302 Medium Load Member

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    Jul 12, 2013
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    I installed both. Fuel mod may add power but didnt see better mpg. Boost mod is better throttle response but its smoke show and soot in oil. I got better boost mod with adjustable switch so you can turn it up or down. 0-11psi on top of yours boost
     
    Slow302, Jun 6, 2020
    Slow302, Jun 6, 2020
    #13
  5. Apr 14, 2023 #14
    landlord

    landlord Light Load Member

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    Jan 14, 2012
    chicago il
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    I bought a fuel wire and on cat et it shows the ambient temp. I thought the ecu was supposed to show higher fuel temper not ambient?
    did I buy a faulty one!!!?
     

    Attached Files:

    landlord, Apr 14, 2023
    landlord, Apr 14, 2023
    #14
  7. Apr 16, 2023 #15
    Slow302

    Slow302 Medium Load Member

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    Jul 12, 2013
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    I got both from good ebay seller. Fuel mod will show ECU that fuel is at 147F. Its not ambient frmp its fake fuel temp. And works better on winter when fuel is cold all the time. On summer fuel is hot enough by it self
     
    Slow302, Apr 16, 2023
    Slow302, Apr 16, 2023
    #15
  8. Apr 16, 2023 #16
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Just get a tune in it. I was gonna do the resistor thingy, I even bought it from radio shack(resistor), then I decided just to get a tuned dropped in(program reflash ECM) it was the best choice I ever made.
     
    Diesel Dave, Apr 16, 2023
    Diesel Dave, Apr 16, 2023
    #16
    Oxbow Thanks this.
  9. Apr 17, 2023 #17
    landlord

    landlord Light Load Member

    60
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    Jan 14, 2012
    chicago il
    0
    I just put the 430 pre low nox tune in!!
    Def better than the 410 multitorque.

    Just wondering why the ecu isn't showing the hot fuel? Checked the ohms and it has low 160 at the resistor.

    Any of you pros have some goof fls fts # for the small block
     
    landlord, Apr 17, 2023
    landlord, Apr 17, 2023
    #17
  10. Apr 17, 2023 #18
    Cattleman84

    Cattleman84 Road Train Member

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    If I remwmber correctly putting the correct resistor inline with the fuel temp sensor only gains you about 35 hp while fuel is cold.
     
    Cattleman84, Apr 17, 2023
    Cattleman84, Apr 17, 2023
    #18
  11. Apr 18, 2023 #19
    landlord

    landlord Light Load Member

    60
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    Jan 14, 2012
    chicago il
    0
    I'm glad you said something I did a dang-on brain fart.

    I DIDNT PUT THE MOD IN series with THE FUEL TEMP SENSOR...stupid me I put it next to my fuel filter housing...

    Stupid me!!
     
    landlord, Apr 18, 2023
    landlord, Apr 18, 2023
    #19
  12. Apr 18, 2023 #20
    little cat 500

    little cat 500 Road Train Member

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    Abbottstown PA
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    Tune it right and forget about this cheap limited trick.
     
    little cat 500, Apr 18, 2023
    little cat 500, Apr 18, 2023
    #20
    Diesel Dave and Cattleman84 Thank this.
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