Originally Posted by odog422
I've got a 2012 RT 5.7L six speed and want to add some JBA shorty headers. I live in MD with strict emissions so the shortys seem like the obvious choice. My real question is this: I used to have a Durango
that I put shortys on and seemed I got a little more response and definitely a deeper rumble in the exhaust note, and this was without a tune. I've been reading here tunes for headers are a no go yet for the '12's, and obviously performance
expectations are different than from the truck
, but I thought with this bolt on, you can roll as is and be fine. My concern is I've been reading here about people talking about running lean and needing to "add fuel?"
Any insight/comments/recommendations much appreciated.
An R/T with the stock Dodge tune and jba headers your a/f ratio is that of the DiabloSport tunes, so yes.
If you load the DiabloSport tunes you will need to add 3-5% fuel in all rpm ranges.
Yes people run it without tuning, but your a/f ratio is lean and that's not safe.
I have a wideband O2 and measure the a/f ratio, and I have the dyno sheet from DiabloSport where they tuned the car, this is how I know these numbers.
07 3.5L Charger K&N CAI, Magnaflow Cat back, JBA shorty's, DS 93 tune, sold, 2010 Challenger R/T 5 speed. 180 degree Thermostat, fan settings lowered, CC, ceramic brake pads, slotted rotors, red and black caliper paint, Challenger label for calipers, Corsa Cat back, functional hood ducts, and hood struts, 93 DiabloSport tune, Mopar drop in filter, JBA Shorties, Wideband O2, custome tweaked tune, Anti-sway bars front and rear, end links, strut brace, 12" subwoofer with amp.