It seemed like such a good idea at the time. This is what I have done: Slingshot dragster, powerglide, 3:73 gear, 6000rpm(ish) stall FTI converfter 6.0 LS motor, stock with large hydraulic cam. 102 MM single butterfly aftermarket intake. Smart Spark controls for ignition - 8 stock LS2 (truck) coils Belt driven Waterman 700 pump -16T:48T ratio (slightly overdriven) Square black Enderle methanol barrel valve off of bird catcher blower hat. Secondary bypass @ 2PSI Main Jet (as low as 50, as high as 180 --currently 150) High speed currently blocked Injector nozzles 160 cc electric (approx equal to .046" ish orfice) 100% duty cycle (always on with ignition) NOTE: no vacuum break, or air bleed on injector nozzles in conventional LS port position F1X procharger 5.4:1 internal overdrive, 46T:32T external overdrive. this blows through butterfly. Here is the problem, if you have not already guessed. It runs extremely rich at idle, even with barrel valve cut back to 5-10% leakage. Idle speed is unreasonably slow even with butterfly open a bunch -as far as the idle screw will take it Throttle response is predictably lean at that point,and gets reasonably good at 50-60% leakage. Tried playing with main jet- a bunch - after messing with barrel valve for 3 gallons or so. At high idle -- 2500-3000 rpm, it is pulling enough vacuum to hold the surge valve wide open. Still way rich until I let some air in. Any thoughts, ideas, criticisms?