You would have to run a very large pulse width to get 190/stock to dump all 190cc of fuel. I think 190/30 are a better combo but still pushing it. I sell a lot of 175/stock injectors and some guys love them and some guys claim zero hp gains. I have worked with some shops and without a FICM tune and with a typical pulse width of 2.4ms those tuners see 0 gains over stock injectors. I have narrowed it down to the tuning that is run. I have some IDP tunes that run 2.8ms of pulse width which help to dump most of the fuel... but that is going to really raise the cylinder pressures.
With that said I love the 175/stock and 190/stock option for someone looking for around 500hp. You get great atomization and great fuel mileage and can get them for a really good price. Then later on down the road you can buy a set of nozzles and swap them and gain a lot of power.
I dynoed my 175/stock vs 175/75 with a KC 68mm Stage 3 turbo (nothing changed except for the tune and nozzles). My seat of the pants did not notice a huge difference but the dyno shows otherwise. I think the reason my seat of the pants was off is because the larger nozzles had a lower atomization which moved the torque curve a little to the right, it actually caused the turbo to spool a little later (lost a little bit of driveability)
You can see that the smaller nozzles get more low end torque (not peak torque) it just kicks in sooner. After about 2800 rpms the bigger nozzles take over big time.
Hope that helps :ford:
