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Tuning 97's with oxygen sensor

Discussion in 'The Hokey Ass Message Board' started by speedshifter, Feb 6, 2012.

  1. speedshifter
    Joined: Mar 3, 2008
    Posts: 312

    speedshifter
    Member

    Has anyone tapping an oxygen sensor in the exhaust, connected to air-fuel mixture gauge in the cockpit? It would seem that this would be the accurate way to select the proper carb main jets and power valves.
     
  2. 32coupedeville
    Joined: Dec 10, 2006
    Posts: 1,253

    32coupedeville
    Member
    from cincy

    yes! my oxygen sensor had always been my nose . the back up was my eyes . if my eyes water its to rich.
     
  3. Dirty Dug
    Joined: Jan 11, 2003
    Posts: 3,721

    Dirty Dug
    Member

    Well said. This isn't rocket science, rather keep it as simple as possible.
     
  4. I did that and used a Westach air/fuel guage. Helped a lot.
     
  5. Crusty Nut
    Joined: Aug 3, 2005
    Posts: 1,834

    Crusty Nut
    Member

    I did a little experimenting with one hooked to a voltmeter in the cab when I was sorting out the blower on my flathead. I had lakes style headers and just made a new cap with a bung in it. It worked fair, but was too quick changing.
     
  6. F&J
    Joined: Apr 5, 2007
    Posts: 13,281

    F&J
    Member


    That's still pretty interesting though. I wonder if it would read more constant if the sensor was not at the far end of a closed chamber like a capped lake?
     
  7. Crusty Nut
    Joined: Aug 3, 2005
    Posts: 1,834

    Crusty Nut
    Member

    Well, the cap was right next to the tied-in exhaust pipe. It worked well enough to make some changes, you just had to average out the highs and lows.
     
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 59,239

    squirrel
    Member

    I put a wideband sensor on my 55 (blown big block), it's interesting....Holley double pumpers run kinda rich at normal driving speeds.

    I also put one on my old truck (stockish 454 with a Qjet), and it looks pretty good.
     
  9. wayne-o
    Joined: Jan 22, 2006
    Posts: 284

    wayne-o
    Member

    I used a wideband one from Innovate Motor Sports (innovatemotorsports.com) to set the mixture on my Rochester FI unit. Works great. Made a removable adaptor to fit into the tailpipe as I had already had the exhaust coated by taking a piece of 1-7/8" tail pipe about 2' long and slipping it into my 2" pipe with the bung welded into the smaller pipe.
     
  10. gimpyshotrods
    Joined: May 20, 2009
    Posts: 24,403

    gimpyshotrods
    ALLIANCE MEMBER

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