Quote:
Originally Posted by tpepmeie
Stock LT5 injectors flow around 20.5 lbs at 43.5 psi. The fuel pressure specification is actually 350 kpa, or 50.76 psi. There is likely some production variation, but 55 would seem really high.
So the conversion factor from 50.76 to 43.5 psi, is 1.080272, making the stock injectors flow 22.1 lbs/hour.
The calibration is actually specified in "seconds per gram" of flow, but most consumer software converts this to lbs/hour for convenience.
0.3484 sec/gm is the stock value. 22.78 lbs/hr or so.
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Running your numbers through this calc
http://www.csgnetwork.com/fiflowcalc.html
Gets exactly the same numbers you get.
Stock flow=20.5
Fuel pressure used for rating the injector=43.5(3BAR)
Actual rail pressure(unreferenced) 50.76 psi
Gives me 22.1 b/hr of fuel at the fuel pressure the injector will actually be used at.
22.1 lb/hr converts to 2.78 g/sec
22.78lb/hr converts to 2.87 g/sec
Never seen seconds per grams before, but it all converts to the same nomatter the unit.