Zax Bugeye "Shaggin' wagon" Build thread - Page 20
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This is a discussion on Zax Bugeye "Shaggin' wagon" Build thread within the Builds forums, part of the Tech & Modifying & General Repairs category; Originally Posted by Rambo So aside from replacement, is there anything you can do about the MAF turbulence? The Banish ...

  1. #286
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    Quote Originally Posted by Rambo View Post
    So aside from replacement, is there anything you can do about the MAF turbulence? The Banish book mentioned extra mesh screens (in addition to the OEM one) could help without significant flow restriction. You could also go to Speed Density, I guess...
    A little turbulence is normal. I won't jump to this conclusion just yet. The MAF and fueling system does funny things when the scale is very far off (>8-10%).

    FWIW, I'm going to start performing CL MAFv scaling, which should really focus in that 15-30g/s airflow range:
    http://forums.nasioc.com/forums/show....php?t=1427448
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  3. #287
    zax
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    You can see the affect the Fujita intake had on my LTFT:

    With stock airbox, injectors scaled:


    With Fujita CAI installed, injectors same scale:


    LTFT ranges are -14.99 to 14.99, so you can see column C is pegged and relying on STFT to bring the mixture to stoich for CL.
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    Registered User Heide264's Avatar
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    Plot your AFR errors over RPM at various loads. I bet you'll find it's RPM dependent and not MAFv. Fuel system resonance ftl.

    Never know... That's just at weird place to have such a sharp spike.
    Quote Originally Posted by Trainrex
    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
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  5. #289
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    Quote Originally Posted by Heide264 View Post
    Plot your AFR errors over RPM at various loads. I bet you'll find it's RPM dependent and not MAFv. Fuel system resonance ftl.

    Never know... That's just at weird place to have such a sharp spike.
    I thought about fluid resonance in the rails. I might go back to the stock airbox to see if the same issue is present.
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    Quote Originally Posted by zax View Post
    I thought about fluid resonance in the rails. I might go back to the stock airbox to see if the same issue is present.
    You should see it there. It may have gone unnoticed. Not a bad idea though.
    Quote Originally Posted by Trainrex
    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
    2011 STi Build Log
    -Part 1 - Reading, Data Logging, and Analyzing Data
    -Part 2 - Turbocharger 101 & Basic Boost Control
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  7. #291
    Cheeky Bastage! spirited09wrx's Avatar
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  8. #292
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    Quote Originally Posted by spirited09wrx View Post
    Bro, do you even LTFT
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  9. #293
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    Given the fact that my MAFv peaked at 4.6 volts during my untuned run, I made the decision to move to a 73mm MAF housing, which I purchased off NASIOC.
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    Well the 73mm MAF housing and enormous ridiculous filter is installed!



    Because the diameter of the new MAF housing is 73mm while the stock is 65mm, the new housing has (75^2)/(65^2) = 1.26x more crossectional area. As such, I scaled the MAF sensor by 126% to account for the slower intake velocity per relative air mass. This was a rough approximation since there are other factors involved in the actual MAFv scaling (turbulence, fluid dynamics, etc.). I tell you guys and gals, as an engineer by profession and a physicist by education, I have NEVER seen a rough calculation prove so accurate in the world off-paper:



    Game on.
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  11. #295
    Registered User Phobic's Avatar
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    that filter is enormous.

  12. #296
    zax
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    And REALLY REALLY ugly!
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    Registered User Heide264's Avatar
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    Holy crap zach - I am shocked that is as close as well. Awesome.
    Quote Originally Posted by Trainrex
    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
    2011 STi Build Log
    -Part 1 - Reading, Data Logging, and Analyzing Data
    -Part 2 - Turbocharger 101 & Basic Boost Control
    -Part 3 - EcuFlash, Experimental Defintions, and a Drive By Wire Intro

  14. #298
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  15. #299
    Registered User pete25r's Avatar
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    ugly and big. it works though right?

    +1 to zax for shooting from the hip and hitting real darn close to a bullseye
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  16. #300
    zax
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    Compression test results:

    Cylinder 1:


    Cylinder 3:


    Cylinder 2:


    Cylinder 4:


    Motor was only lukewarm, unfortunately. Compression in cylinder 1 dropped a few PSI, but still well within healthy limits. Still excellent compression for a 2003.

    149 - 155 - 157 - 152
    Last edited by zax; 03-07-2013 at 06:14 AM.
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
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    Zax's Shaggin' Wagon Build Thread Now tuned for 99% pure Unicorn Jizz!

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