ok well my setup is as follows:

custom turbo setup, basically a stage two hahn kit.
my fuel is 255l walboro, 4an braided lines, sfmu, and i just installed some ford 440cc injectors.

now first off, i know that the injectors are overkill and am kinda regretting it now but still.

after installing my injectors a couple days ago i have everything running again, the idle was a little rough at first but once the ecu compensated it got better. my idle pressure is 20 and the static is 25. i cant go any lower than 20 because of my 4an lines. my wideband reads a pretty steady 14.7 or around there at idle. 14.7 is stoich right? well when i drive it feels really bogged down and i cant get any boost. i think this may be due to a vacuum leak and i will be testing that as soon as i can find a bike pump haha. but while im driving the wideband shows about 14.xx up until like 3k rpm. at cruising speed around 2k rpm it stays about stoich still.
what is confusing me is that i have an engine code for running rich and my short term trims are around 15-20 and occasionally hit 25 and i guess that is whats throwing the code. but how can i be throwing a code when my wideband says im stoich. and why am i running so bogged down?

Where is the wideband O2 sensor in relation to the stock sensor. Is it possible that there's an exhaust leak between the two?


-http://www.symtechlabs.com/-

the wideband is maybe 6 inches meax after the upstream narrowband...so unlikely unless im leaking from the bung weld for the wideband. would that make a difference?

bump

You're getting the "fuel system rich" code because your ECU is pulling way back on the fuel to compensate. You're running stoich because of that adjustment. When you accelerate, those fuel trims tend to readjust or get thrown out in favor of the accel enrichment which makes the car bog down.

Originally posted by DarkOne
You're getting the "fuel system rich" code because your ECU is pulling way back on the fuel to compensate. You're running stoich because of that adjustment. When you accelerate, those fuel trims tend to readjust or get thrown out in favor of the accel enrichment which makes the car bog down.

Whats the best way to avoid this ? Since ecu cant adjust more with these injectors ?

Buy smaller injectors to have bigger room to compensate ? Use safc to lean out at idle and low rpm ? or just throw all these and buy portfueler ?

Just a thought... but what kind of wide band is it? and how long has it been in? My AEM would bounce between 14.1 and 14.9 when the sensor was unlugged and also when it burned out.

its a zeitronix, brand new. i installed it less than 500 miles ago. it should be fine!

Originally posted by 98dsmNT
its a zeitronix, brand new. i installed it less than 500 miles ago. it should be fine!

unless running too rich or running leaded race fuel fouled it out. i would borrow one from someone and see whats happening. the fact that your stft is 20-25 would worry me concidering the aftermarket injectors. your computer doesnt know you have bigger injectors. do you have a tuner? i recomend a tuner.