MSPNP: Fuel Table Cells Peak at 255

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • ovo_e30
    Noobie
    • Aug 2020
    • 30
    #1

    MSPNP: Fuel Table Cells Peak at 255

    I've been trying to tune my M20 Turbo, however, Tuner Studio doesn't allow me to add more fuel into my fuel map.
    Whenever I go into boost my AFR's go into 13-14 which isn't a good thing.

    Ignition: WastedSpark/Bosch Multicoil Pack Module
    Fuel: High Flow in-tank Fuel Pump + 42lb injectors.
    FPR: stock

    There's no way I should be getting lean AFR readings at 1-5psi. I have the stock FPR with the reference vacuum line running directly to the manifold with NO tee's on it. I'm thinking maybe I have a setting improperly set.
    Any thoughts?
    2 Photos
    Tags: None
    • Andre3127
      Wrencher
      • Dec 2017
      • 291
      #2
      Is your FPR working? Pull the vacuum line off the FPR and smell for fuel. Try to rig up a fuel pressure gauge. Just because you have a good pump doesn't mean that a line couldn't be clogged. Doesn't hurt to verify.

      Budget E30 Parts - Used and Reconditioned parts for your BMW

        Comment

        • Jaxx_
          E30 Mastermind
          • Dec 2009
          • 1880
          #3
          What are your deadtime settings? Do you incorporate AFR target? What is your AFR table? Are you multiplying MAP?

          You should really post the whole tune and ideally a data log to really diagnose this.
          '84 318i M10B18 147- Safari Beige
          NA: 93whp/90ftlbs, MS2E w/ LC, 2-Step
          Turbo: 221whp/214ftlbs, MS3x flex @ 17psi

            Comment

            • varg
              No R3VLimiter
              • May 2014
              • 3287
              #4
              If you don't have low fuel pressure, you've made some mistake(s) in your basic settings if this is happening; MAT air density, general settings, injector dead-time, all should be double checked.

              IG @turbovarg
              '91 318is, M20 turbo
              [CoTM: 4-18]
              '94 525iT slicktop, M50B30 + S362SX-E, 600WHP DD or bust
              '93 RX-7 FD3S

                Comment

                • ovo_e30
                  Noobie
                  • Aug 2020
                  • 30
                  #5
                  Got my hands on a Fuel Pressure Test Kit and low n’ behold, I have low fuel pressure at the fuel rail as well as between the filter and fuel pump. I pinched off the vacuum reference line going to the FPR and got no change in pressure. I forgot to pinch off the return line in the midst of my troubleshooting but I have a hunch it’s the FPR.
                  Edit: ok so I did a quick check on the fuel pump to see if anything was astray and noticed that the hose that comes off the pump and goes into the hanger broke. Apparently the strap I wrap around the pump/hanger wasn’t holding on tightly enough so the pump was dangling from the hose and wearing it out causing my issue. FIXED the hose and now I have normal fuel pressure. The fuel table needs to be re-tuned but that’s okay.
                  Last edited by ovo_e30; 12-10-2021, 09:07 PM.

                    Comment

                    • ADEN
                      Mod Crazy
                      • Feb 2008
                      • 620
                      #6
                      Keeping the vacuum hose attached to FPR made tuning off idle WOT harder for noop like me lol.

                        Comment

                        Previous template Next
                        Working...