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ECMlink Major Crack in JMFab Exhaust Manifold!

Posted by tdykes1234, Dec 15, 2019

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  1. tdykes1234

    tdykes1234 Proven Member

    58
    0
    Joined Feb 12, 2013
    Columbus, Indiana
    I may be putting this inthe wrong forum so feel free to move it if need be. The issue that I'm experiencing is that I can not go full throttle or build over 15psi on my hx40. I've had someone who is an engineer for cummins and a fellow dsmer look at my logs (which I'm unable to post) and he 100% believes that this exhaust leak is the cause of the issue. He mentioned that my mafraw value was too high for the gm/rev that the engine was seeing at that point and this was being caused by the exhaust leak pulling in fresh air and throwing off the o2 sensor. I would like to also mention that I'm running a downpipe right out the front bumper so he said that's why its so sensitive to the readings that it is getting. I'm going to post the data at least from that point so you guys can get an understanding of what we are looking at. I know that an exhaust leak, especially a big one like this, will slow spool and cause a rich/lean condition at idle/cruise while in closed loop. It shouldn't affect the car at WOT in open loop though should it? It shouldn't prevent me from being able to go WOT and actually build past 15psi? And can it truly affect the maf readings in any way, shap,e or form? I'd appreciate the help here because id like to be able to make just one pull on this car without it breaking a part!!!

    Car Mods:
    6-Bolt Swap Fresh Rebuild (185 on all cylinders)
    Dual Fuel Pumps 450intank/350inline
    1800cc Injectors
    Aeromotive FPR (43.5psi)
    Aeromotive Fuel Rail
    6an Feed/6an Return
    E85
    JMFab Exhaust Manifold
    Holset HX40
    FMIC (No Boost Leaks)
    S90 74mm TB
    Crower Springs/Retainers
    Crower 280 Cams
    Aires 9:2 Pistons
    Pauter XBeam Rods (HD Pins)
    1.3mm Cometic HG
    All ARP Hardware

    EcmLink Readings:
    RPM - 5,656
    ThrotPos - 52%
    TPSVolts - 2.90
    Battery - 14.1v
    BoostEst - 13.5psi
    AirflowPerRev - 2.17gm/rev
    Airflow - 204.5gm/s
    MAFRaw - 2419.3Hz
    AFRatioEst - 10.0:1
    AEMInlineUEGO - 18.0:1
    LTFT HI - 0.0%
    LTFT LO - -2.7%
    CombinedFT - -2.1%
    InjDuty - 38.7%
    Closed Loop - 0
    IdleSw - 0
    CoolTemp - 182F
     
  2. madmax4

    madmax4 Proven Member

    30
    9
    Joined Jun 21, 2011
    hartford, Connecticut
    A hole and in your exhaust manifold definitely affects the turbos ability to build boost. Not really the best idea to keep going WOT with a leak of your mani either. Where is the leak? Do you have pictures? Could just have someone weld it for you.
     

    Street Build 148  1

    1997 Mitsubishi Eclipse GST
    awd · manual · 2G DSM
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  3. tdykes1234

    tdykes1234 Proven Member

    58
    0
    Joined Feb 12, 2013
    Columbus, Indiana
    I'm taking it off the car today and sending it back to JMFab for repairs. I'll post pictures later today.
     
  4. tdykes1234

    tdykes1234 Proven Member

    58
    0
    Joined Feb 12, 2013
    Columbus, Indiana
    This picture shows the readings when it starts to break up
     

    Attached Files:

  5. madmax4

    madmax4 Proven Member

    30
    9
    Joined Jun 21, 2011
    hartford, Connecticut
    Yea not really surprising your having trouble building boost, with a crack it’s like a second wastage dumping exhaust gas. Basically the turbo can’t spin as fast because that crack is redirecting exhaust letting it escape before your turbine.
     

    Street Build 148  1

    1997 Mitsubishi Eclipse GST
    awd · manual · 2G DSM
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  6. tk106

    tk106 Supporting Member

    2,064
    620
    Joined Sep 11, 2017
    Cincinnati, Ohio
    It’s too lean in that picture 18 afr. Full log would help. Your leak must be huge to cause 18 afr reading.
     

    213  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    201  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 2K  6

    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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  7. madmax4

    madmax4 Proven Member

    30
    9
    Joined Jun 21, 2011
    hartford, Connecticut
    Damn I didnt even notice that, looks like it progressively leans out throughout the pull too. I wonder what the actual boost is. @tdykes1234 how do you monitor boost? A gauge and BoostEst?
     

    Street Build 148  1

    1997 Mitsubishi Eclipse GST
    awd · manual · 2G DSM
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  8. tdykes1234

    tdykes1234 Proven Member

    58
    0
    Joined Feb 12, 2013
    Columbus, Indiana
    I'm unable to actually post a log because the laptop I'm using doesn't have a wifi card. And the crack is absolutely huge. One runner is completely separated from the flange at the weld. It's cracked all the through and all the way around. That's why I'm sending it back. Did you notice though that AFRest was pig rich though? Shouldn't those be close to each other?
     
  9. tdykes1234

    tdykes1234 Proven Member

    58
    0
    Joined Feb 12, 2013
    Columbus, Indiana
    Yes, I have an autometer boost gauge and then used BoostEst in the log just so you guys could see that. I can go past 15psi and I cant go WOT without it breaking up.
     
    Last edited: Dec 15, 2019
  10. tk106

    tk106 Supporting Member

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    620
    Joined Sep 11, 2017
    Cincinnati, Ohio
    That’s the target afr at that load. You were above 60% throttle and probably in boost so it will target a richer afr. You can track it on the maxoct table
     

    213  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    201  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 2K  6

    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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  11. tk106

    tk106 Supporting Member

    2,064
    620
    Joined Sep 11, 2017
    Cincinnati, Ohio
    I wouldn’t go wot until you get that fixed
     

    213  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    201  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 2K  6

    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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    1990TSIAWDTALON likes this.

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