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This is a discussion on Maus bulids a Racecar because Racecar Build Thread within the Builds forums, part of the Tech & Modifying & General Repairs category; Originally Posted by maus I do have a WB02. Do you think a 73mm maf housing is too big? No. ...

  1. #106
    zax
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    Quote Originally Posted by maus View Post
    I do have a WB02.

    Do you think a 73mm maf housing is too big?
    No. Incidentally that's also what I have.
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  3. #107
    Registered User Heide264's Avatar
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    Quote Originally Posted by maus View Post
    I do have a WB02.

    Do you think a 73mm maf housing is too big?
    Quote Originally Posted by zax View Post
    No. Incidentally that's also what I have.
    I would just get the stock one. You'll lose resolution down low, where it is already picky as is. It's an exponential response, and I doubt you are hitting 4.5V now. Do a WOT pull logging MAF voltage. If you are above 4.8, I'd be concerned.
    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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  4. #108
    Registered User maus's Avatar
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    Quote Originally Posted by Heide264 View Post
    I would just get the stock one. You'll lose resolution down low, where it is already picky as is. It's an exponential response, and I doubt you are hitting 4.5V now. Do a WOT pull logging MAF voltage. If you are above 4.8, I'd be concerned.
    You mean logging over 4.8 on the stock maf? What would a higher number indicate?
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  5. #109
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    Quote Originally Posted by maus View Post
    You mean logging over 4.8 on the stock maf? What would a higher number indicate?
    Yeah. The MAF goes up to 5V. The ECU will only interpret it up to 5V I believe. Hence, people trick the MAF sensor by increasing the housing size. Hence, if you exceed that 5V... you need a larger diameter MAF housing or to convert to speed density. The MAF housing isn't really used to allow more air in... it's to allow the stock MAF sensor to decipher additional air. You basically have to apply a multiplier to your whole MAF scaling. While this allows higher amounts of air to be interpreted by the car... you squish the already cramped and touchy scaling down lower. I believe the difference between stock and 73mm diameter MAF housings in intake restriction of the stock intake is nominal when compared to the inlet plumbing... Either way, its worth noting.

    I guess in a nutshell, people upgrade the housing size because they run out of MAFV. If you are okay with the stock sized housing, stay with it to maintain your best resolution possible - similar to why you shouldn't oversize injectors normally. If you are going to run out of it, which I HIGHLY doubt you will without a significantly larger turbo, then you'll want to get the larger housing.
    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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  6. #110
    Registered User maus's Avatar
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    Gotcha. Makes sense.
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    Quote Originally Posted by maus View Post
    Gotcha. Makes sense.
    Yeah. Another small difference is that the stock sized MAF housing will at least work if you put it on, right out of the garage. I'd apply a scalar to the tune before even starting it with the 73mm.

    Talk to your tuner about it - he'll probably have a preference.
    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

  8. #112
    Registered User maus's Avatar
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    Quote Originally Posted by Heide264 View Post
    Yeah. Another small difference is that the stock sized MAF housing will at least work if you put it on, right out of the garage. I'd apply a scalar to the tune before even starting it with the 73mm.

    Talk to your tuner about it - he'll probably have a preference.
    Will do. Don't know who I'm going to go with for etuning this time yet.
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  9. #113
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    Quote Originally Posted by maus View Post
    Will do. Don't know who I'm going to go with for etuning this time yet.
    Be prepared for quite a few iterations this time around. Equal Length headers really change your boost control tables, a lot. Between those and my EWG... it took me a TON of pulls to get my boost control dialed in. It isn't just your target boost/wgdc anymore =(.
    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

  10. #114
    Registered User maus's Avatar
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    Quote Originally Posted by Heide264 View Post
    Be prepared for quite a few iterations this time around. Equal Length headers really change your boost control tables, a lot. Between those and my EWG... it took me a TON of pulls to get my boost control dialed in. It isn't just your target boost/wgdc anymore =(.

    Things I hate. Pulls for Logging
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  11. #115
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    Quote Originally Posted by maus View Post
    Things I hate. Pulls for Logging
    If you use open source, make sure you set up stand alone logging. Leaving a laptop on is annoying.

    The recent firmware update kinda fouled mine up. It seems like I need to leave it connected to the laptop until after I plug it in now. It was supposed to allow time stamps on the logs (which it does)... but now I can't log unless I plug it in with my laptop connected. The thing has power even when the cars off, so it is only an issue when I actually pull the cable at least.
    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

  12. #116
    Registered User maus's Avatar
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    Quote Originally Posted by Heide264 View Post
    If you use open source, make sure you set up stand alone logging. Leaving a laptop on is annoying.

    The recent firmware update kinda fouled mine up. It seems like I need to leave it connected to the laptop until after I plug it in now. It was supposed to allow time stamps on the logs (which it does)... but now I can't log unless I plug it in with my laptop connected. The thing has power even when the cars off, so it is only an issue when I actually pull the cable at least.
    No, I've thought about selling the AP and going to open source but I like to use my AP as a feedback knock gauge.
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  13. #117
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    Quote Originally Posted by maus View Post
    Things I love. Pulls for Flogging
    fixored.
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  14. #118
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    Nice racekor!!!!

  15. #119
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  16. #120
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    Subscribed. This thread has awesomesauce.
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