quick question bout pwm

[gmoneyapplesauce]

okay i've been reading a lot about hho today. I see that if you have a fuel injector you need to use a pwm. im broke college student so i want this to be affordable. i have 07 gmc 4.8L. Could I get away with just using a efie or is a pwm necessary?

[myoldyourgold]

A PWM is only necessary if you live where it gets down below freezing and are forced to run full strength electrolyte to stop your electrolyte from freezing solid and doing some damage. Otherwise you can control heat/amps by using the right strength of electrolyte with no need for a PWM. The EFIE is much more important and necessary to see significant gains. Cheap EFIE's are next to useless is the bad news.

[gmoneyapplesauce]

http://www.amazon.com/Dual-Edge-Sensor-Enhancer-Water4Gas/dp/B001G48TCA/ref=sr_1_1?s=automotive&ie=UTF8&qid=1323053982&sr=1-1

is this a good efie?

[myoldyourgold]

NO, not in my book. Just controlling the MAP/MAF does not work. You need to control all the sensors and coax the ECM to use the leanest possible tables it has.