The HEUI injection system is capable of 1000rwhp. We have more than enough fuel (per injection event) we just don't have enough fuel per time. And that's not the fault of the injection system, but rather the electronics that control it.
Injector "size" or capability equates to how much fuel you can inject on each injection event. And that controls how much torque you can ultimately produce with an engine because it will directly determine the BMEP for that stroke.
So what kind of torque output have wee seen on the 7.3? 1400 or so? Didn't Greg do around that much on his "BD's" ? So that was a ~250cc injector......not exactly a "huge" injector. (Nitrous oxide only bring air to the party, not fuel).
So, we're obviously capable of around 1400ft/lbs of torque with even small injectors as demonstrated by Greg.
Problem is, that's not power. For power you need to deliver not huge shots of fuel per stroke, but lots of fuel per time. Now if you can only do 11,200 injection events per minute (2800rpm 8 injectors) you are extremely handicapped on getting a lot of fuel per time compared to having 15,200 injection events per minute (3800rpm 8 injectors).
At 3800rpm the same injector will inject ~%36 more fuel per minute than it would have at 2800rpm. That's fuel per time, that's horsepower. If you kept the same VE and burn efficiency that's 36% more power all else constant.
Or to simplify, if Greg still made the 1400ft/lbs of torque at 3800 instead of 2800, he would have produced 1012rwhp.....
Same injectors, same torque, same cylinder pressure. Just have to stop progressively turning our injectors off past ~2600rpm is all.
