Originally Posted by kingston73
I've spent days reading through all the "intake" threads I could find so to start with, please don't respond by telling me not to get one, they destroy your engine, search the forum etc. Like I said, I've read through pages of threads but still have questions that I haven't found answers to.
For those of you who have actually installed one and used one, I have a few questions.
1. is the MAF calibration unit absolutely required for the 4.0?
2. have any of you found it decreased mpg's at all?
3. have any of you used more than 1 type? If so, did you like one over another and why?
4. anything else I should know before I get one?
If anyone here bashes on you report it.
Q#1: No, but, because CAI's change the way the airflows past the MAF sensor, it confuses the ECU into thinking there is more air going into the engine then there actually is. The MAF Calibrator intercepts the data from the MAF and changes it, thus 'correcting' it before it goes into the ECU.
Q#2: Most definitely YES! Before I found this forum I was sold a bill of goods that my K&N 63 will improve power and increase MPG. The power gain was minimal and my MPG's went down by 2-3 MPG's. After discussing the problem with Gadget at URD, I purchased and installed the Calibrator which was mapped specifically for my K&N 63. The difference was immediate. The erroneous data from the MAF was causing the ECU to dump more fuel into the engine than it needed, hence it was running rich and wasting fuel. This also meant the truck was 'bogging down' under acceleration unless it was under wide open throttle. The Calibrator largely returned my MPG's pretty much back to where it was before.
Bottom line, had I known all these things before hand, honestly, i don't think it was worth the hassle. To purchase the intake and then find out that you have a whole new set of issues is annoying. But in reality it is to be expected because you are altering the airflow dynamics of these computer designed engines and you end up with unforeseen issues. Yes, my truck is faster, it accelerates quicker and pulls harder than stock. It was just a PITA to get there.
My understanding it the only intake that does add a 'substantial' amount of power is the URD CAI. This is the one which requires cutting a hole in the radiator frame to mount the intake in front of the radiator.