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1G maf vs 2G maf

Posted by butcha, May 5, 2011

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  1. butcha

    butcha Probationary Member

    Joined Apr 10, 2011
    carlsbad, New Mexico
    Do i need to upgrade to a 2G MAF in order to turn my boost up past 16 psi in my 1G? If so, do where can I get a 1G-2G wiring conversion?
  2. Carlz0r

    Carlz0r Proven Member

    Joined Aug 30, 2006
    Vernon, BC, Canada
    You'll have to make one yourself more than likely.

    Here's a wiring diagram:
    2G MAF in a 1G TEL/GVR4

    As far as it being necessary for turning your boost past 16 psi I can't tell you for sure. Are you running the stock 14b? Stock injectors?
  3. laser90

    laser90 Proven Member

    Joined Sep 9, 2003
    West Palm Beach, Florida
    No you don't need to upgrade. You can find the harness is the classified. I picked my up for $15. You can also make your own. There are quite a few write ups on how to make one.

    660  0

    1990 Plymouth Laser RS Turbo
    12.652 @ 114.650 · 1G DSM
  4. Boost_Addict_88

    Boost_Addict_88 Proven Member

    Joined Dec 29, 2008
    Brazil, BC, Canada
    Here's the sitch: 1G MAFs, as us 1G owners know, pretty much suck. With that said, they can hold up to 350hp. 2G MAFs flow 29% better then a 1G's, which causes the AFRs to run LEAN. To fix this, a set of 550's, 22% more flow, causing RICHER condition over the stock 450's. This, with a tune, will have your car running better and ready for about 450hp.

    To answer your original question, no, you do not need a 2G MAF to run over 15psi. Before worrying about the MAF, first upgrade your fuel pump if you haven't done so. 190lph is a great pump (had one on my GS-T) and will allow you to run 15psi (not sure the max on that pump though). Are you on the stock Turbo? If so, consider a Small 16G, as its an overall better Turbo (max is about 22psi) as well as upgraded injectors (550's at least), as you can run into leaner conditions with the S16G since it flows more. I had stock injectors on my 1G with a S16G and never ran over 14psi.
  5. Bud92gsx

    Bud92gsx Proven Member

    Joined Jan 16, 2008
    Wisconsin, Wisconsin
    I hit fuel cut with a small 16g on 1g maf with 390 injectors..Upgraded to 450's and lowered fuel pressure and have not hit cut yet..Also been thinking about putting on my 2g maf but don't want to run lean..

    4K  18  14

    1992 Mitsubishi Eclipse GSX
    13.300 @ 102.400 · 1G DSM
  6. MY1GDSM

    MY1GDSM Proven Member

    Joined Apr 26, 2007
    On the beach, Washington
    Never mind what you MAY be able to get away with...
    Regardless the 1g Maf is crap He's a perfect example below of how badly they do. From a car I started to tune with a 1g maf needless to say It ended up with a 2g maf on it after this...
    Notice when the Maf signal starts to break up then AFR spike before Maf clamp saves the day.

    1g Mafs belong in garbage. Hell IMO All Mafs Period all belong there. ;)

    If you have a way to tune using Either a 1g maf or 2g.
    Id say 2g all the way just remember when using a SAFC to tune that when your reducing your Airflow signal that you want to retard Ignition Timing as well.:thumb:

    Attached Files:

    Last edited: May 5, 2011

    949  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    gofer and Boost_Addict_88 like this.
  7. butcha

    butcha Probationary Member

    Joined Apr 10, 2011
    carlsbad, New Mexico
    Thanks for the input guys. I am running a walbro 255, rc 550, small 16 g, 3" turbo back, tuning with a safcII and a wideband, and a fpr set at 43 psi. my problem is at 16 psi, roughly 5500 rpm, my car will buck and back fire. and feels like it hits fuel cut.
  8. burkgonzo

    burkgonzo Proven Member

    Joined Oct 27, 2005
    Wichita Falls, Texas
    Whats your plug gap?

    639  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM
  9. butcha

    butcha Probationary Member

    Joined Apr 10, 2011
    carlsbad, New Mexico
    .28 1 step colder ngk plugs
  10. ilco187

    ilco187 Proven Member

    Joined Jan 3, 2009
    Niles, Michigan
    You mean .028 inches. not .28 mm right? bpr6es or bpr7es is a good plug i run the 6's

    882  0

    1993 Mitsubishi Eclipse N/T
    · 1G DSM
  11. butcha

    butcha Probationary Member

    Joined Apr 10, 2011
    carlsbad, New Mexico
    Yeah, sorry was replying from my phone. I am running the BPR7ES plug set at .028

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