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  • #1

    Adjustable Fuel Pressure.

    I was just looking at a dyno where someone lowered the stock fuel pressure to 36psi. He said he was gaining even more at 35psi.

    How could adjusting the psi increase horsepower.

    If what he was saying is from the factory the car runs rich and by leaning out the mixture he was getting closer to stoichiometric?

    It was on a 96 WS6.

    Information from WS6.com
    Last edited by Fox Slaughter; August 25th, 2010, 10:15 PM.
    Originally posted by Yoshi94
    Mines about an inch bigger than Kyles. I need to get one of those
    Originally posted by ryanwarby01
    Put it this way, if you have a money tree a LT1 is a wood chipper!
    sigpic
    Tags: adjustable, adjusting, afr, don, dow, dyno, eve, formation, fuel, hat, horsepower, increase, ion, loop, lowered, maf, open, possibly, pressure, psi, sensors, stock, stupid, wot, ws6
  • #2
    Leans out the afr at WOT maybe but that is a stupid way to do it.

    Used to own a Firebird.

    Comment

    • #3
      If I am not mistaken WOT goes into open loop and ignores the O2 sensors and the MAF sensor and just dumps fuel correct? So it could possibly dumping to much fuel in and not getting stoichiometric correct?
      Originally posted by Yoshi94
      Mines about an inch bigger than Kyles. I need to get one of those
      Originally posted by ryanwarby01
      Put it this way, if you have a money tree a LT1 is a wood chipper!
      sigpic

      Comment

      • #4
        you dont want stoic at wot

        Comment

        • #5
          Oh yeah don't you want it down around say 12.3 or something?
          Originally posted by Yoshi94
          Mines about an inch bigger than Kyles. I need to get one of those
          Originally posted by ryanwarby01
          Put it this way, if you have a money tree a LT1 is a wood chipper!
          sigpic

          Comment

          • #6
            Mine ran VERY rich with the factory tune. Black smoke at WOT.

            Used to own a Firebird.

            Comment

            • #7
              I have heard of people cranking the fuel pressure to make the injectors flow more.

              Never have I heard of someone turning it down just to lean out the WOT mixture.

              Thats what tuning is for...


              Comment

              • #8
                I have never heard of this either, weird...

                "You can get a lot more done with a kind word and a gun,than with a kind word alone."-Al Capone
                "Ever since we was kids,we always knew that people can be bought.It was only a question of who did the buyin' and for how much"-Charlie "Lucky" Luciano

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                • #9
                  only time I've heard of adjusting fuel pressure to lean out was in a standalone for nitrous. This guy sounds like he is in for trouble.
                  Doing less with more


                  Comment

                  • #10
                    I guess theoretically it's possible. My car got better numbers on the dyno when it was at 14.7 AFR than it did at 12.x AFR. Not to mention the day of the 14.7 AFR run it was a LOT hotter and the day of the 12.x run it was a little cooler. Doesn't mean it'd run good down the track, but if the numbers are all you're looking for...
                    - Brian Meissen
                    Owner, MiFBody.com
                    Administrator, LTxTech.com


                    1994 Camaro LT1 Transplant - 357ci LT1, cammed, stalled, and driven.
                    2022 Camaro LT1 - "Cherry Bomb 2"
                    Michigan FBody Meet & Greet Car Show 2022
                    June 4th, 2022 - 9am to 3pm!!!
                    The HUB Stadium, Auburn Hills, MI

                    Comment

                    • #11
                      Leaner is always going to make more power to a certain extent. Safety and reliability become a factor when you start to lean on them like that.


                      Comment

                      • #12
                        Originally posted by c0ncEpT View Post
                        Leaner is always going to make more power to a certain extent. Safety and reliability become a factor when you start to lean on them like that.
                        Exactly. Keep running WOT at 14.7 and see what happens to your engine.
                        - Brian Meissen
                        Owner, MiFBody.com
                        Administrator, LTxTech.com


                        1994 Camaro LT1 Transplant - 357ci LT1, cammed, stalled, and driven.
                        2022 Camaro LT1 - "Cherry Bomb 2"
                        Michigan FBody Meet & Greet Car Show 2022
                        June 4th, 2022 - 9am to 3pm!!!
                        The HUB Stadium, Auburn Hills, MI

                        Comment

                        • #13
                          Originally posted by meissen View Post
                          Exactly. Keep running WOT at 14.7 and see what happens to your engine.


                          Except, replace the smily with your engine.

                          Used to own a Firebird.

                          Comment

                          • #14
                            Dr Phil didn't even want to do the 2nd dyno run when he saw the 14.7 afr... but when I told him I had mahle pistons he was Ok with it since they're forged.
                            - Brian Meissen
                            Owner, MiFBody.com
                            Administrator, LTxTech.com


                            1994 Camaro LT1 Transplant - 357ci LT1, cammed, stalled, and driven.
                            2022 Camaro LT1 - "Cherry Bomb 2"
                            Michigan FBody Meet & Greet Car Show 2022
                            June 4th, 2022 - 9am to 3pm!!!
                            The HUB Stadium, Auburn Hills, MI

                            Comment

                            • #15
                              Originally posted by meissen View Post
                              Dr Phil didn't even want to do the 2nd dyno run when he saw the 14.7 afr... but when I told him I had mahle pistons he was Ok with it since they're forged.
                              I didn't know you had forged pistons, thats badass
                              Doing less with more


                              Comment

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