OK but this is how I see it happening: the wheel "grabs" which translates to "flows" more air for each revolution. That means there is that much more exhaust gas that must be forced back out thru the turbine housing that turns one
ne with the comp wheel. Our stock turbos without anything special are already greatly in the need of the larger 1.15 housing or turbine wheel flow to bring things more inline which even with that its still well past 1:1 below 30 psi. Now add this extra air flow going into the turbo inlet from this improved wheel. The way I see ( not real numbers just an example) If you had a new comp wheel regardless of its actual size if it flowed as much as a 4294 comp wheel would you saddle that with a GT38 turbine wheel and stock housing? Things have to match up flow for flow. IMO this is especially critical with the 7.3 because of displacement and head flow design. From what I have seen and I am sure I could be wrong here but the 7.3 needs more turbine flow that other engines. Maybe they all need it. But with the 7.3 you add more turbine flow up to a point and you tend to loose little if any response but gain power on the top end. Same goes for adding WGs. By relieving the back pressure on 38r/D66(latter which has the larger turbine wheel) you pick up HP.
Now here comes a new higher flow comp wheel. Does that now not just create that much more exhaust flow per rev that needs to flow thru that turbine? Would that not create that much more drive pressure? If nothing else about the turbos design has changed i.e. comp housing, turbine housing, turbine wheel, waste gate. For every rev of increased air coming in the comp inlet is there now not just that much more in ratio drive pressure backed up robbing power on the turbine side?
I think the analogy of breathing and underwater swimming is good example. If you are able to inhale a certain amount of air but at the same time can only exhale a fixed amount. Now if you increase the amount you can inhale but still can only exhale the lesser amount other than that first full inflation of your lungs ( spool up and build boost faster) you will not be able to hold your breath or swim underwater any longer as you will never be able to fully empty the used carbon dioxide to refill it with power creating oxygen. Or you could look at it as with breathing air thru two different straws. If I gave you the same straw for breath in and out then switched and gave you a much bigger straw to breath in but left you with the smaller straw to breath out. It can let you build up boost and there for power faster but not to a higher peak.
I could see it spooling up faster and boost building up to its peak faster just not sure on ultimately increased peak power or flow. I fully acknowledge I could be looking at this incorrectly. If so I would find it helpful if someone would explain it. Even better if that has the experience to know they are correct would explain it in enough detail so I can understand it. LOL
