Announcement

Collapse
No announcement yet.

New cams and MAF need retue?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • New cams and MAF need retue?

    I plan on adding upgraded cams 256 intake and 264 exhaust on a redtop s13. I was wondering if I will need a retune if I am using a MAF. Dosen't the MAF take care of this?

    Thoughts?

    Thanks!
    Chicago Region SCCA SM # 688 http://www.scca-chicago.com
    TSSCC SM # 688 http://www.tsscc.org

  • #2
    You definitely need a retune. the MAF will make it run during WOT, but you'll make a lot more power (and know you're safe) if you get it tuned properly.
    Originally posted by SoSideways
    I don't care what color they are as long as they are LONG AND HARD.
    '04 G35 Sedan 6MT- The DD
    '96 240SX- The Track Toy

    Comment


    • #3
      Thanks. It has to do with time frame. I have to send my ECU out to get tuned as I can't find a local tuner that doesn't require a stand alone solution. I just have an eprommed ECU and don't feel the need to replace it.

      I need to time it where I can send it out, install the cams, get it back and reinstall it, all between events. Hopefully even slip in a dyno session as well to make sure its safe.
      Chicago Region SCCA SM # 688 http://www.scca-chicago.com
      TSSCC SM # 688 http://www.tsscc.org

      Comment


      • #4
        It will work fine without a retune. The fueling should be spot on if your tuner doesn't completely fail.

        Your timing at WOT will go down slightly from where it was at the same manifold pressure, but it'll still be within safe boundaries if it wasn't horrible before. You're probably giving up 10-20 rwhp without a retune, but again, safe to run.
        '18 Chevrolet Volt - Electric fun hatch for DD duty!


        DefSport Koni Sleeve and Spring Perch Buy!!!
        http://www.nissanroadracing.com/showthread.php?t=5902

        Comment


        • #5
          You shouldn't need one. If you overrun the last TP column, it will pull your timing and fuel values from there. It will continue to add fuel based on what that says, so it will only lean out if you run out of fueling capacity.
          Most mail order tunes and base maps have the last few TP columns spaced far apart, but they usually put something safe in the last column for this very reason.
          If you have a way to monitor AFR and listen for knock, try it out.

          Comment


          • #6
            The reason why people say you should re-tune it is because you start operating in "uncharted waters"(e.g: fuel/timing cells that you couldn't access before), and so the tp and timing settings are now merely extrapolations of what you were able to access at wot.

            If you tuned with a wideband before, your current tune will now be in the ballpark at best. You'll need to retune to get the most out of your new setup, but I personally wouldn't worry about it unless your injectors are too small.

            Comment


            • #7
              Thanks for all of the replies. I did have an opportunity to get it re tuned before the cams went in. Just had to blow the engine and then I had all the time in the world. As soon as my engine refresh/rebuild gets broken in, I'll do a dyno at the same place I had it done before. I'll let you know the results.
              Chicago Region SCCA SM # 688 http://www.scca-chicago.com
              TSSCC SM # 688 http://www.tsscc.org

              Comment

              Working...
              X