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Well im a happy bunny with my results, so here you are
First run was on 97 ron petrol, only mod is ITG air filter.
Engine power measured........251.2bhp@103mph/5024
wheel power measured........227.4bhp@103mph/5024
power losses measured........23.7bhp@103/5024
engine power corrected........253.6bhp@103/5024
torque corrected..................290lbs/ft@2503
pressure/temp standard.........993mBar/ 14 deg c
Second run was done on LPG.
Engine power measured.........235.5bhp@111/5412
wheel power measured..........211.1bhp@111/5412
power losses measured...........24.4bhp@111/5412
Engine power corrected.........237.8bhp@111/5412
torque corrected..................280lbs/ft@2679
pressure/temp standard.........993mBar/ 14 deg C.
So all is running well and not to much losses running on LPG compared to standard.