Is increasing the boost achieving a similar result to diesel/gas?
Please
check my logic here.
I have noticed a few posts on diesel with gas (LPG) injection.
The benefits being more complete combustion of the diesel, hence better economy and more power on full throttle. And a slight saving in the cost of fuel since some diesel is replaced with cheaper gas.
The cost is about $1500.00 after the government rebate.
However, I have been playing with boost on the pajero and increased it from 12 psi to 16 psi. I have installed a boost gauge and EGT. The fuel pump settings have remained stock factory settings. Boost obviously is only really higher at full throttle settings, but checking boost levels before and after increasing the boost at set speeds on the same section of road, at the same time of day, the boost is slightly higher (1 to 2 psi) at part throttle settings from 1/3rd throttle up.
I only use full boost ocassionally, maybe once a week or every 500 km, since I drive for economy.
During this experiment, I have noticed less soot, particularly on higher throttle settings. The pajero has an increased fuel setting on the fuel injection pump when boost rises. So I assume that getting more air into the engine has increased the efficiency of combustion. I am getting better fuel consumption, but only being able to
check it from tank to tank during normal road use, it is hard to measure accurately, but a rough figure might be 5%. Maybe I am just driving more carefully. (Accurately measuring fuel consumption in every day use is open to many uncontrollable variables.)
Power has increased at the higher throttle settings, so also put this down to the efficiency of combustion.
So is the $50.00 spent on installing the manual boost controller a cheaper alternative to diesel/gas, giving almost the same result?
If diesel gas gives 10% saving in fuel bills, gas & diesel compared to just diesel, and I have already saved 5% with my simple modification, the $1500.00 gas installation will take about 170,000k, or 7 years at 25,000k & $1.70/l to pay itself back.
Sound about right?