Hi,
thanks for the link. I think i have stored it somwere on my harddisk and read it some couple of years ago, but could not remember before today.
Some nice infos in the paper, especially with measured "hard facts", which i like most. Pherhaps i am a bit self-pleased, but overall i would say that my thougth are in line with the stats from the paper.
I like the comparison chart (Fig. 7 on Page 123) of changed boost pressures with equal fuel injetion at 4000 rpm. Do you agree that the boost pressure is probably in barg and the backpressure in bars? If not, that would mean that the backpresure is nearly 1,0 bar higher than the boost pessure with ~ stock boost with an VNT20 turbo, which i can not imagine.
If we agree that the chart show barg vs. bara, than all three cases shows a postive pressure head (higher boost than emp) and increasing the boost level from 1,6 to 1,8 bar, without adding fuel brings sligtly higher efficiency, less smoke and pullition and reduces the egt from 614°C to 558°C by more than 50°C.
This would be good, as i hope to possibly reach my 230hp goal with around 1,8 bar (26-27 psi) @ ~4500rpm - 4800rpm, with ~ around 82-83% volumetric efficieny due to big valve head and cam. If so, i would like to increase boost by additionally 0,1-0,2 bar to make sure there is more air than necessarry and increase swirl further in hope of incresing the quailty of the combustion as well.
Best Regards
Alleslowbuged