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Thread: E24 CSI ITB's with AFM

  1. #1
    Join Date
    May 2023
    My Cars
    1986 635csi

    Lightbulb E24 CSI ITB's with AFM

    I've been looking into putting ITB's on my 635CSI but everyone says I need to have a standalone ecu inorder to do that. Is there any way I can install it without? Is it possible to fab up a plenum around the ITB's and then have an intake tube with the sensor inbetween or am I just being a little slow and stupid. If it helps I could mock up a quick sketch of what it would look like. Just wondering as I havent seen anyone on either forum mention this or think of it but I do know its a thing in the honda community.

  2. #2
    Join Date
    May 2023
    My Cars
    1986 635csi

    - - - Updated - - -

    like this
    Last edited by 635Cami; 05-20-2023 at 12:26 AM. Reason: cant figure out how to add link

  3. #3
    Join Date
    Jul 2004
    Houston, TX
    My Cars
    36 Cylinders
    Many of the BMW engines have a similar setup to your drawing. If you do it well without causing turbulence across the air mass meter or changing the diameter of the AFM, then it should work fine.

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #4
    Join Date
    Dec 2005
    Melbourne, Australia
    My Cars
    E24, E34 x2, E36
    The M635csi does this exactly. The only issue using the airflow meter is you are drawing all the air through a 2"x2" flap, and you would need to extend the wiring loom approx. 3 feet. I've changed to full standalone and the intake noise is much better without the air meter, so is the power.
    90 E34 M5
    84 E24 M635csi standalone ecu with coil on plug
    94 E34 540i/6 SC 5-17psi Flex fuel/standalone ecu
    97 Z3 2.8
    97 E36 M3 euro SC still u/c

    11 Audi S5 APR stg2
    19 Volkswagen Amarok V6

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