No mater what you set it at with an induction pipe 1 meter long at 2inch dia it really strugles when the engine is under max load going up hill.Trust me ive tried! It may make a difference if you use a bigger bore pipe that tapers down to a 2 inch for the carb venturi conection.Ive got mine running great now ive just clocked another 300 odd miles up in mine and with the new exhaust system ive made up it really does pull well up the hills now i can hold a steady 50mph up a hill now.Feels like stacks more tourque. Most the time i use my van its to do big journeys mostly motorway.I will put a list of the mods on here when i get time. Its doin about 18miles to the gallon sitting at about 55-60mph on the motorway cost me just over 100quid in juice it aint cheap now days!lol Anyone else do long haul journeys in there van?? What miles to the gallon are you doing?