Stage 1 map?

[Ruan]

I think you'd see the same improvements going from 200bar to 500bar in economy... But to see the gains in emissions it seems that you just need to keep pushing the injection pressure - the reason people re programming the EDC have to ramp up the rail pressure is to see increases in power, since the nozzles are standard - I personally rekon (and this is only my theory - I'm more than happy to be proven wrong on all of this - I'm probably being naive...) that you could bump the orifice size of the nozzles, recalibrate the ECU's injector calibrations and keep the stock rail pressure, but drop the durations RIGHT down and you'd see nigh on the same efficiency and economy, but there would be massive gains in torque, even though theoretically the atomization would be worse... The only reason PSA didn't do this is due to emissions - you just wouldn't see the same emissions out of the engine, and possibly more noise...

The power and economy seems to be perfectly acceptable at around the 1200bar mark... Well saying that, I'd be perfectly happy with a normal 200bar DI engine running 200hp - it'll still do 55mpg easily! The noise is worse and the emissions are worse - that's the only thing I can attribute it to... But pushing to 1500, 1700, 2000 bar injection just seems like alot of work done, for not much gain in economy... Since an almost 1950 theory design, 175bar indirect injection engine is seeing 55mpg, yet a HDi is seeing maybe 65mpg - a 10mpg increase for 50 years technology and another thousand bar of injection pressure on top can't be right - it's got to be something else!