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MS is going to rely on constant fuel pressure when calculating injector pulse width. 35 PSI will work if that is where you created your tune and nothing changed. If you created your tune at the more standard 3 Bar or 43 PSI and its 35 PSI now it is going to be really lean. MS does not have a fuel pressure sensor so it can not compensate. Disabling O2 feedback probably made the problem worse if this is your issue.
JPS, Not related to Bill's problem directly, I'd like to understand this statement a little better. My understanding is that a regulator referenced to manifold pressure is preferred, as it keeps a constant pressure differential across the injector. As the manifold pressure goes down, so does the actual fuel pressure (relative to atmosphere) and the injector "sees" the same pressure differential regardless of (steady state) load. So that should be OK. But using a fixed pressure regulator and a MAP sensor. Under speed/density, we tune the VE table. MS should should still be able to compensate pulse widths for the varying pressure diffeentials at the injector. No? Further, if we run loosed loop with a wideband and tune the AFR table, the MS should be able to compensate no? That is assuming the AFR table is correct. Paramount in this arguement is that the injector(s) all follow the same volume vs pressure differential flow rate. At least that is how I think it should be.
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Chuck.
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