93celicaconv":osz9hcfy said:
Do you have an otherwise stock ST185?
How is your wb02 installed (maybe said differently, are you still using your original nb02 sensor and your wb02 sensor is a 2nd sensor)?
intake, fueling and exhaust is stock other than the following:
cat-back resonator and muffler
st205 wta intercooler core
CT27 turbo mod
aftermarket BOV (in bypass mode, like stock)
greddy EBC, disabled (stock pressures)
FCD set to ~ 16PSI, so about 20% up from stock.
wbo2 AEM gauge in-line with nb output to the ECU to replace the stock nbo2
93celicaconv":osz9hcfy said:
Are you still running the stock ECU?
If running a stock ECU, are you getting any check engine lights / trouble codes?
Yes. Only code is excessive lean condition. It usually comes on after ~ 200 miles of driving, or after any amount of boost following a reset.
93celicaconv":osz9hcfy said:
I know on one of our two all-stock ST185's, one of the MAP sensors wasn't putting out a linear output signal relative to pressure changes (the others all are), and when using the particular MAP, the engine doesn't have the same torque at higher RPM's as when using a good "linear output" MAP sensor. So on a complete stock ST185, it sure feels like the MAP has some effect on fueling, even though I think the AFM has the primary influence.
Also, if your fuel quantities are being properly controlled, you should go towards rich when the engine needs to put out a high level of torque, and towards lean when coasting. If yours doesn't change at all - it almost seems like you are not getting a sensor input to the ECU - the air:fuel ratio should be changing. But if the ECU isn't getting an input, it should trigger a check engine light (at least a stock ECU). If you are running an aftermarket ECU - I don't know anything about those.
Do you think the FCD Then could be a problem child here? or perhaps a problem with the ECU itself?
I installed the FCD and CT27 before the problems began, but the engine was throwing the lean code already when I replaced the nbo2 with the wbo2, so I have doubts it is the o2 reading, despite the decidedly *odd* behaviour that the AFR is reading so steady across the map (and occasionally stopping reading at all... but I suspect that may be from the sensor exceeding the max safe exhaust gas temp---something the lean condition is likely causing, judging by the fact that my 2000 degree F ceramic header paint is burning off the heat shielding near the o2 bung.)
Do you think it is safe to drive *at all* in this condition? I feel worried that I may be harming the engine every time I start it up to test another change since I need to drive it x miles for the ECU to re-learn... even though I am careful not to get on boost *at all*.