Here are my numbers on the dyno run this summer:
First pull, no LPG
HP 183.15 Torque 325.45
2nd and 3rd pull with LPG
HP 205.35 Torque 362.64
HP 205.51 Torque 361.55
So 22.96 increase in HP and 37.19 increase in Torque with the propane.
One of the guys figured that is 298.5HP at the crank with the LPG. not bad for a stock pump, just turned up, stock injectors, old style Banks turbo, and homeade LPG. Oh yea, little exhaust work also.
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Darrin
"Big Ed" 1989 F-350 XLT Lariat, King Ranch, Crew Cab, 4x4, Banks Turboed 7.3 IDI, C6, Gear Vendors, 4:10ls, Propane Injection, Ram Air Hood Scoop, Air Compressor/Horns/Bags/Tank/Conditioning, 17x10" wheels, 35" BFG's, Dual 5" Sidepipes, Edlbrock Shocks, Dual Steering Stabilizers, Add a Leafs, Full Guages, Custom Counsol, CD, Amp, Sub, Rear Power Slider, Brushguard, Headache Rack, Spray in Bedliner, Diamond Plate, TCI Deep Trans Pan, Super Duty Cooler, and Aux Filter, Amsoil Dual Oil FIlters and Synthetics, Lots more,... check out the video,.. D