Originally Posted by Tivs
Ok guys im at a loss im still getting crap mileage. im like getting 180 miles to the tank. i kno they arent known for setting mileage recoreds but come on! i changed my plugs and oil doin wires soon (hopefully that helps more) I have a free flowing exhaust with no CATs (I find odd i couldnt find a downstream O2 sensor yet i have no check engine.) Cleaned my TB (looks new) and cone filter. I can literally get on it and it will drop a quarter tank (and slightly come back up) I need help FAST.
First did it just out of nowhere start the bad mileage? For what it is worth I have had similar issues when removing cats, & having too free of flowing exhaust. Engines with cats seem to perform overall better with them on. You may have more power without them but you pay at the pump. These electronic controlled computer engines seem to do better OVERALL with some back flow pressure. I have a 3" two into one MagnaFlow exhaust on my V-10 it helped the power some, but surely didn't hurt the mileage.
The exhaust shop told me to leave the cats that I would loose more than I gain OVERALL.
Please note: OVERALL I mean best power, mileage, driveablility. You can gain more in one area but as a rule loose in others. The only way around this is to reprogram the computer. There are no programers out there for Dodge V-10 that I'm aware off. I even went to a performance Dodge Dealer & they didn't know of any either.