Had some MPG gain on other engines drawing water vapor into the intake- (i.e.- dulp. the effect that moist air creates on a rainny day) I'm not finding a usable port on the 4.7 any ideas- tapping the vac line from the braking system seems a bad idea.

 

You want to purposly create a vacuum leak?

 

No- Looking for a way around it - Getting vac from the intake before the TB would be the ticket but my intake flows too well to generate enough pull thru a small tube connected to it. there is an unused and undrilled hose barb behind the TB in the intake- im not sure if it can be opened without issues- doing this would disrupt the airflow into the intake and that could be a neg. Ideally splicing it into a existing air
input to the engine would be ideal. I miss carbs-

 

Any added air after the throttle body will create problems, since the idle is created with the IAC inside the TB. I would suggest looking in to an alcohol injection setup, and run 100% water or a 50/50 ratio with alcohol. This would involve a holding tank somewhere in the truck, and then it would be pumped to the intake and injected before the TB.

 

It already has plenty of water vapor in the intake...look for my catch can post!

 

isnt this a bad idea? couldnt you hydrolock you cylinders this way? i thought water/alcahol was to cool forced induction (turbo) in hi boost racing

people run this on a daily basis for MPG?