My question is, do you actually need an EFIE in your fuel injected vehicle?
It sounds like you do, but i keep hearing stuff about MAP sensor adjustment, and EMU EMC resetting.
What really works, do you need to do all three or what?
It depends on the vehicle you are using. To have complete control you will want to do all three. It's so much easier with non-computerized motors. Why not try a gas powered lawn mower first?
I guess it would depend on the vehicle , As far my case goes I have a 97 nissan altima and have managed to get a 7 mpg gain with no efies or map enhancers ,I tried a map enhancer , my advise on those is to not waste your money on one , they dont work , you can lean the gas down with one but after a little while the computer adjust and it's right back to where it was ...waste of money in my book ....I done test with and without map enhancer and get no difference in results whether I use it or not ,..
The way I got around an efie is I just reset the computer then drove around for 4 days to let it learn and adjust to the hho and it did ...I average 35 mpg was only getting 28 mpg..And one other on the efies there is one guy on you tube done alot of testing, he injected pure oxygen into the motor and it didnt affect the reading on o2 sensor at all...Most of the hydrogen generators out there dont put out enough oxygen to affect an o2 sensor ....No one really knows for sure what it does affect , but I know it affects something ...and besides the hho burns the gas more thoroughly and if that is what is happening then the computer should (from my understanding) lean the gas down automatically...THat has my experience anyway ....Someones elses may be different ... Hope this helps
The first thing to do is try it with no enhancers and if you get no gains then try an o2 sensor extender that is found in auto part stores as (spark plug anti fouler) they only cost a few dollars. You may have to drill the hole bigger to fit your sensor and if it still dont work try to add another one. What this does is it takes the sensor out of the main flow of the exaust. It may or may not work for most vehicles but its the least expensive.
I put HHO on a 94 S10 and didnt have to add anything else. I've heard that most vehicles 98 and newer need o2 sensor modifications like: EFIE or extenders.
I'm going to try it on my newer 8 cly truck soon and I will try to post the results of what worked or didnt work.
I've also heard that it may take up to 2 weeks for a vehicle's computer to learn how to utilize hho, and increase fuel efficiency