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HELP! Only 18 lbs of boost with a Magneti Marelli ECU
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Thread: HELP! Only 18 lbs of boost with a Magneti Marelli ECU

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    HELP! Only 18 lbs of boost with a Magneti Marelli ECU

    Here my story I jumped in my little abarth to head over to moms for Christmas Brunch . I look forward to a fast ride on Christmas day do to the lack of highway patrol Im hitting it on the freeway and notice im am not able to hit 21 lbs of boost . God knows how long ive looked down to see the
    exact amount ive been getting but norm is 20 with a hit and miss on 21 lbs. I then down shift to third and notice at 5000 rpm my boost drops from 18 to 8 as the speed increases. Can anyone PLEASE HELP?

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    Lifetime Member Lifetime Member Abarth619's Avatar
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    When did you install the MM ECU? Do you have the stock boost gauge? If you have the stock boost gauge it will not give you a accurate reading with any piggyback.
    Last edited by Abarth619; 12-25-2014 at 09:30 PM.

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    Sales@roadrace (12-26-2014)

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    I have an ATM boost gauge

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    Super Moderator Tweak's Avatar
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    Did you still feel the power increase?

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    I do except in 3rd it does not seam as violent feels weak!
    Last edited by Carcraz8; 12-25-2014 at 11:40 PM. Reason: Added info

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    Super Moderator Tweak's Avatar
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    Quote Originally Posted by Carcraz8 View Post
    I do except in 3rd it does not seam as violent feels weak!
    Perhaps a temp change has at least slightly changed things? Maybe try resetting the ECU? I never did own a MM so I am not 100% certain of all the ins and outs that might factor into running it. Each ECU mod is varied enough to have to be learnt with time. I'd try resetting and see if that improves things since it is such an easy troubleshooting step to take.

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    Yeah i'm seeing 20lbs in 5th and 18lbs in 4th since i installed the MM... quite disappointed with it... others report 22-24lbs of boost. I have the ATM gauge as well. I've reset the ECU a few times. I've tried beating on it after reset and i've driven nice for 80+ miles and then checked boost levels.

    I'm getting rid of it and going to go with something else, appears to much better options out there now.

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    Alright I'll unplug it this morning and plug it back in . I'm driving to Nebraska today we will see how it does and I'll report back a few hours in to the trip.

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    Lifetime Member Lifetime Member Abarth619's Avatar
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    I know when I first installed my RRM Ulitimate it took a while before the car would make 22 pds of boost. I also have other mods as well that would help it get to that level of boost. Give it a couple weeks and let the car learn the piggyback a little.

  11. #10
    Super Tech Lifetime Member shadowshaggy's Avatar
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    Also, you're in Wisconson. Temp affects how much boost it'll make. Reset the ecu and go from there.
    Mods I don't have:
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    ....pretty much everything else

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