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Thread: Dcoe jetting help!

  1. #1
    LX User InAccordance's Avatar
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    Dcoe jetting help!

    Need a second opinion on what I'm missing here.
    Got new jets, put them in, much better response, spitting back is completely gone.
    Won't idle to save it's life.
    I've followed the book step by step to set lean best idle but it will not stabilize no matter what I do.
    I'm at 1 1/2 turns out on the mixture screws. Turning out further makes it worse.
    I'm not on the progression hole, made sure of that.
    Stop screw is at 1/2 turn.
    Jets are:
    Main 145
    Idle 45f9
    Air corrector 190
    Emulsion tube f16
    Venturi 34mm

    Any tips would be appreciated.
    Originally posted by Shady_Pro:

    ya piggy backing our ecu's is like putting webbers on your lude....useless!...



  2. #2

    Dr_Snooz's Avatar
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    Re: Dcoe jetting help!

    I can't speak to your carbs specifically, but on most other carbs, jets are unrelated to idle. The idle is an entirely different circuit with only two adjustments: mixture and speed. The speed can be adjusted by ear, and the mixture can be adjusted by smell (ie: if it smells rich, you're too rich). I might be missing something important though.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  3. #3
    LX User InAccordance's Avatar
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    Re: Dcoe jetting help!

    Looks like we got it, spent 4 hours out in the heat tinkering with these things.
    Looks like it boiled down to them being out of sync. The right end of the linkage was flexing enough to cause that side carb to open slightly ahead of the other and was being jostled around from engine vibration which was causing the butterflies of said carb to open and close rapidly. At least that's what it seems like and is the best theory I can come up with.
    Redid the linkage to where I am only using one arm now and have both carbs tied to it. Sync'd up just fine and idles smooth at a crispy 900 rpm. No spitting, no shaking or heavy vibrations.
    Fiddled with the timing a bit as well. Advanced it slightly which helped too.

    Did have to take one carb off and got around to finally putting that coolant bypass in so that was a bonus.

    Now, I do need to work on the progression circuit as they still hate it when you feather the throttle. Mild to stomping the throttle does fantastic, no flat spots at all. Just doesn't like to be feathered. If you do, feels like it's missfiring. I know that's not what it is but has a similar feel.
    Originally posted by Shady_Pro:

    ya piggy backing our ecu's is like putting webbers on your lude....useless!...

  4. #4
    LX User InAccordance's Avatar
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    Re: Dcoe jetting help!

    So this is what I'm running with now and it's strong

    Main: 145
    Idle: 55f8
    Air corrector: 190
    Emulsion tube: f16
    Venturi/choke: 34mm
    Aux Venturi: 4.5
    Pump Jet: 45
    Pump Exhaust: 40
    Needle Valve: 2.00

    About 2 3/4 turns out on the mixture screws. Seems a bit high but they like it this way.

    Pretty good power along the entire band from what my butt tells me even in the lower rpm range (aka below 3k). Doesn't drop off in the higher rpms. Taken it to 7k so far and was still going strong. Just slightly rich in the main circuit but I want to keep it that way.
    Originally posted by Shady_Pro:

    ya piggy backing our ecu's is like putting webbers on your lude....useless!...

  5. #5
    LX User Fixedit's Avatar
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    Re: Dcoe jetting help!

    Awesome, glad to hear it. Definitely going to save this info in case I ever get to play with a set of those on these cars. Thank you!

  6. #6
    LX User InAccordance's Avatar
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    Re: Dcoe jetting help!

    Just keep in mind I haven't done any internal modifications yet. Still on stock cam and everything.
    Originally posted by Shady_Pro:

    ya piggy backing our ecu's is like putting webbers on your lude....useless!...

  7. #7

    Dr_Snooz's Avatar
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    Re: Dcoe jetting help!

    Glad you got it working. Congrats!
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 213k miles, MT swap, rear disc swap

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    LX User InAccordance's Avatar
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    Re: Dcoe jetting help!

    Looks like it's going to be one of those thing that has to be adjusted regularly. It's already creeping on me, idle is slowly going up from engine vibration messing with the screws.
    Originally posted by Shady_Pro:

    ya piggy backing our ecu's is like putting webbers on your lude....useless!...

  9. #9

    Dr_Snooz's Avatar
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    Re: Dcoe jetting help!

    That happens with the idle speed adjustment screw on the FI throttle bodies also. A big glob of RTV sealant in the screw hole fixes that right up.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 213k miles, MT swap, rear disc swap

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  10. #10
    LX User InAccordance's Avatar
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    Re: Dcoe jetting help!

    Will have to do, creeped up to 1100. Might actually leave it there though cause at that, when in gear, it drops to 750ish which is actually good. Plus lose about 100 when the lights are on.
    Originally posted by Shady_Pro:

    ya piggy backing our ecu's is like putting webbers on your lude....useless!...

  11. #11

    Dr_Snooz's Avatar
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    Re: Dcoe jetting help!

    Yeah, getting a good idle speed on these takes some tinkering.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 213k miles, MT swap, rear disc swap

    Can't see my car? Install the "photobucket embed fix" Add-On in your Firefox browser.

    Shop manual downloads available here: https://www.dropbox.com/sh/vtyhl48z5...udl0xk_Oa?dl=0

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