HHHmmmmm

**Sarge** · 02-02-2006, 05:34 PM

Curious and thinking out loud....
Got the GM EFI Jet schedule from NX....OK....but I am wondering....
these jets sizes for various RWHP shots are calibrated utilizing stock injector size on the GM engines correct? So if a person upgrades injectors from 28lbs to 42 lbs do the jet schedules posted still remain accurate? In other words somebody sat down and said OK this stock engine puts this much volume in the cylinder that consist of this % of fuel and air....we want 100RWHP so based on the above factors we need to add X to the above Y to get the 100RWHP shot into the stock mix....
Of course a dyno tune and A/F readings are taken...but I am curious if there is a "curve" to properly jetting based on existing engine mods/air/fuel flow and pressure etc.

**mrr23** · 02-02-2006, 06:33 PM

injectors would only come into play if you are refering to dry. even then, the MAF readings will make the necessary adjustments.

also, the jetting charts are based on a calculation of this size jet will flow x amount of nitrous. therefore, it will produce y amount of hp.