Don't sweat it. Just build it...
I agree totally. For the Newbies, Build the W4Gas first , it is quite simple to do, forget about everything else for the time being. Next test and check for mileage under different conditions.
Learn everything you can about the unit you have built, for example....Check MPG in the City without W4G power turned on, then check with W4G running. Do the same with Hwy driving.
Check amperage being drawn, quit worrying about voltages with the W4G unit. Amperage is determined by the amount of baking soda used and can be read with an inline ammeter.
Here are some things that I have learned that may be of use....
City driving 15.95 mpg W4G turned off.
City driving 23.42 mpg W4G turned On.
Output of W4G connected to Intake Manifold gets me 15.89 MPG
Output of W4G connected to Air Intake after air filter gets me 25.04MPG.
Interested in hearing from others that have checked this out.
Noticed sudden increase in amperage to 6 amps running Windshield Washer Fluid in jar. Checked, found lots of gunk in jar and the jar was so hot that I could not handle it with bare hands. Removed jar and replaced with new WWF, 2 tsp of baking soda in another jar. Current was around 2 amps, no heating of jar in next 50 miles.
MPG can vary considerably due to outdoor temperatures like we have in Ontario. Once you have fairly consistent data from running W4G, then start on the other things that will improve your mileage.
All the above has been done without changes to the various sensors. Have tried switching in the home built MAF enhanzer several times and have got dramatic boost in MPG to as high as 41 mpg on 03 Venture.
Have fun and don't sweat it... Ted