if you're changing boost and taking away controll of boost from the ecu it can't control anything. i always advise people to get a wideband as soon as they start to adjust boost levels at all, you'd be surprised how quickly these cars can go lean on you and you don't even know it. the ecu is only designed to control fuel based on stock psi levels, and once you remove it from the boosting equation it has no idea what's going on and can't really adjust fuel accordingly. so don't count on the ecu, it's smart but it's not that smart.

widebands just let you monitor a/f's. you need a seperate unit to control fuel (dtec, neo, etc.). unless you've done some kind of fuel system upgrade (pump, injectors, return line, whatever), you're not really going to have much to control. without those upgrades you have to change boost levels to adjust a/f's. one you do some fuel upgrades though and get a fuel controller, you can pull fuel to tune.

 

Thanks PSI Chick. Its good to know that someone actually answers questions on these forums.

 

glad to help

 

I too was holding 14psi stock as well.......