Compression Ignition Addict
Join Date: Aug 2011
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I am researching this subject myself and should have side by side dyno charts in about a month... For now I can show you what 175/stock nozzles and a 68mm vgt turbo can do. I had no other upgrades, no ficm tuner, no intake, no ported manifold, no water/meth, etc. I am hoping in about 1 month to add nozzles to the truck and overlay the graphs to see how it affects performance.
You can see that it made a ton of power/toruqe right away in the lower rpm range (where most people drive daily), but once it go high up in the rpm the fuel started to drop off because of the stock nozzles holding back the injectors. The pulse width of the injector can only go so far. Once the motor starts spinning fast enough the pulse width cant empty the 175cc from the barrels fast enough.
These are of course just my theories and from much research I have done.
Very nice, like to see the differences for sure. Members like you are what is needed to help find truth or not about things, I would love to do dyno things but no dynos around me. The whole injector thing is still up in the air, about the nozzle sizing. The 75% nozzles on my 225 seem better then my 205/150 did.
2004 F250 Ext.cab fabtech 5.5" lift,and traction bars 35" on 18".2005-2007 grill and LED headlights,58v FICM, Warren dual HPOP system, fuel reg. return system, areo 1000a fuel pump, dual fuel filters, ARP studded heads, CCV reroute, EGR delete, 225/75 Warren injectors, water/meth injection (cooling mist),SCT tuner with customs, banks intercooler. MTW stage 4 turbo, built trans by Andy Warren, 4:10 Detroit lockers.