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Toyota Vienta 3VZ-FE LPG Dual Fuel Conversion

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Hi everyone, I just converted my Toyota Vienta 3VZ-FE to run on Sprintgas LPG. I have no idea which kit was fitted into my car. I got a really good deal from a local installer. About $500 out of pocket after the Victorian government rebate. The system installed is a single point vapour injection system. The LPG vapour is fed at the throttle body.

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I lost nearly half my boot space because of the tank. I didn't opt for the donut tank that some people fit into the spare wheel bay because that would have cost me $300 extra. That being said, I usually only drive by myself or with one passenger. I have the backseat to put all my stuff. The LPG-Petrol switch is located near the fuse box. There was a blank fascia plate which made it convenient for the installer. He didn't have to do any cutting of my dash.

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Performance wise, you can feel that you need to put your foot down more than usual to get the car going. The low end torque that we love so much about the 3VZ is not there. I found that the power increase is now a much straighter curve towards the higher revs. I think I will need my LPG mechanic to tune my AFM such that I get back the lower torque bump. That being said, I'm used to only revving up to 3k to get off the line to 80kmh which is the speed I usually drive at in suburban areas. Cruising on the highway is no problem at all.

I had an issue with the LPG gas causing the engine to idle too low. When I was decelerating from 80kmh, somehow the overdrive/4th gear didn't change up and that caused the engine to stall. Thank goodness I was approaching a red light. Happened another time when I was turning a corner. I brought it back to the LPG installer and he put in a balance line running from the airbox to the LPG mixer. I also decided to change my sparks to the NGK LPG plugs. The loss of low end power was reduced after I switched the spark plugs.

I ran my first tank of LPG to zero and then filled it up. It came up to 46.44 litres of LPG. I'm assuming my tank is a 55 litre tank. I am still running on my first full tank of LPG so I'll update you guys on the milelage later on. I'm currently at 200km at the fuel gauge on the switch is showing 2 out of 4 green lights. (red light = reserve). Hopefully I'll get up to 350km from 40 litres of LPG. With an 8cent discount from Coles/Shell, I am about 58.9 cents per litre of LPG. Works out to be less than $25 for a full tank of LPG.

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