Hey Art, how do you know the exact PSI?
Here is another question for you which I have wondered about before. Since the vapors are what ignite instead of the liquid, why don't they heat/evaporate the gas before injecting it? It seems to a layman (me) that this would increase fuel economy. Can you help explain this?
PSI - google…. Lol. I'd have to get some thermodynamic data for gasoline but there's an issue with the thought. In order to get to ~2000 psi and remain in a gaseous state the temp would need to be really high. No doubt beyond a point where it would auto ignite or decompose. Either would be problematic not to mention needing to run at say 2000 degrees (just a wild guess to make a point). As it is, the vaporization of the fuel in the combustion chamber reduces the temperature of the compressed air (not sure if it's a big factor or not with the 11.5 to 1 CR) thereby reducing the likelihood of detonation due to the higher compression ratio (we won't get into the timing of the injection event..).
Fuel economy, getting the most efficient burn of the least amount of fuel to produce the power output you need. It's not so much about the state of the fuel (gas or liquid) but how it's used. The direct injection gives you a finer control of how much fuel you need based on the other parameters the computer is reading from the engine.
Keep in mind the above is all a thought process for which I have no real data to back up….
