5M-GE Air Flow Meter Upgrade

Discussion in 'Engine/Drivetrain' started by Justin Danger, May 2, 2020.

  1. Justin Danger

    Justin Danger Addict

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    Hi all,

    I've had some questions here and there recently about the AFM upgrade that I recently did, so here is a little run through for ya.
    First off, I went with this upgrade because it increases the diameter of the intake. I have a 22rte with a performance head and exhaust system (see Betsy) and I wanted to allow more air into my engine. I don't know if this will work for you, but I had fun with it, and I do believe that it has improved performance.

    These are the AFMs next to each other with their dimensions
    Front:
    20200502_131549[1].jpg
    Back:
    20200502_131423[1].jpg

    If you manage to get an AFM that is from a later year than an '82 5m, the internal circuitry will be different. I ended up with one that was not an 82. Easy enough, you can just swap out the internals and everything jives!

    20200502_131704[1].jpg

    For the piping, I just kind of pieced it together. From the AFM down, it is a 3" to 2.5" silicone reducer with a 45 degree angle, a 2.5" metal intake pipe with a 45 degree bend, and a 2.5" 90 degree silicone elbow. The metal 2.5" pipe is the most constrictive point on the system, so I gave ya a little maths showing how much bigger the new intake is compared to stock.
    20200502_133614[1].jpg

    20200502_132832[1].jpg
    The stock pipe has an intake port for the front vent on the valve cover. My system doesn't, so I was recommended to tap the bottom of the AFM for a port behind the vane to hose to. for now, it just have a vent filter on the hose coming out of the valve cover.
    20200502_132404[1].jpg

    One great thing with this upgrade is that the 5m AFM has an adapter for a cone style filter.
    20200502_131757[1].jpg

    I'm running the cone filter for now, but it sounds obnoxious, so I'm trying to modify the stock air box to allow more air though and mount to the 5m AFM.

    Thats my story, cheers!
     
  2. TRUCK ACTION

    TRUCK ACTION Grand Toyotaholic

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    Nice write up & photo's!
     
  3. Justin Danger

    Justin Danger Addict

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    Thanks Truck Action! I'm just doing my thing and hoping to spread the knowledge. It seems like around 2009 to 2012 there was a lot of things being done and said with these trucks and a lot of knowledge out there. I do my research, and want to make sure that this info is still available for everyone.
     
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  4. sirdeuce

    sirdeuce Newbie

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    I've thought about this, but I believe the AFR would be lean. Any other necessary parts to make this work? If the injector volume is increased to work with the greater flow through the AFM the idle would become overly rich. Can't find any straight-up answers out there.
    Just spitballin'.
     
  5. Justin Danger

    Justin Danger Addict

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    Didn't have a problem with that. I read a lot about lean concerns, but didn't experience it. Only problem I had was fuel cut under high acceleration due to the more air passing through. My AFRs were steady in the 14.7 range even with this upgrade and all the other upgrades on my engine.
     
  6. sirdeuce

    sirdeuce Newbie

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    Was that 14.7 under power or just at idle, or cruise? Fuel cut should only occur at a specific programmed RPM. Acceleration rate and airflow wouldn't be an issue. I would rather see AFRs at cruise closer to 14.0 and under power closer to 13.0, maybe a bit richer, and that's still a bit on the lean side. Still looks questionable to me.

    This truck I have, is my first 22RE, Since I live in CA I want to stay within the smog Nazi's guidelines, at least make it seem like I am. I know all the things I can get away with with a carbed 22R. The EFI tune for this engine has a few "what the hell" areas in it's maps that I can't access or change. I'd like a stand-alone, but those wouldn't pass visual, let alone functional tests here. So I look at mods like the Supra AFM, at least the tech shouldn't notice the difference, unless they're really sharp. Would be nice if a piggy-back unit, like the e-manage, was available for this ECU.

    There is a company out there, Toyoyech or something like that, that can solder in a socket and burn a new tune to a chip, but they want your vehicle on they're dyno and they won't give you your maps. I would like that, but I would want the tuning software so I could burn my own chips.
     

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