mrx

Hallo,

i have a strange problem and i hope someone can help me out.
Normaly i tune my car's open loop, but this time i have to tune a car closed-loop because it has to pass very strict emission's and i had issues with a changing tune when using crome and tune it open loop and then afterwards switch on closed loop again.


Because the car has only one pre-cat o2 bung, i would like to put my wideband in the o2 bung and feed the ECU with a narrowband simulation.
I have a WBO2 unit and set the output to <14,4:1 = 0,9v / 14,7:1 = 0,5v / < 15:1 = 0,1v

but when i connect it that way, the lambda closed loop frequency is awfully slow.
I checked the voltage with my DVM and it shows 0,9v when rich, and 0,1v when lean but the ECU does not seem to recognize it.
It goes very rich (~10:1) and after around 20sec. it does totaly lean (~17-18:1)

When i connect the stock NB sensor everything is fine and the closed loop switching frequency is normal (~0,25-0,5Hz in idle).

Do i have to mod something in the ecu to use NS simulation from a WBO2?
do i have to do special settings in crome?
do i have to take care about anything else?

I have a real heater resistor connected to the ecu and used a 100% stock P30-G00 map for testing.