88b16civic

Since there is a problem correlating the external WB data with the internal RPM and Map readings from the ECU, I was wondering if it possible to plug the WB into the coolent temp wire (is it 0-5V) OR use a voltage divider to scale the voltage output down on the wideband to 0-1V and then feed that into the existing O2.

TurboEF9

Both are fieble, but neither will give you the result you want.

The problem with reading WBO2 data is that we can't accept 0-5 volts. Stock it reads ~3.8v (Hondata findings) which is about 17:1 or something.

We basically just need to get the code to not "flip out" when it gets a reading over 1 volt. Then code has to be written to scale it to narrowband for use in the original closed loop routines.

These things are int he works..

88b16civic

i was just wondering if i could do this until the ROM can nativelly accept the wideband signal. I was gonna make a voltage divider and scale the resistance to 0-1V and then feed it into the stock O2 input. Then I was gonna convert the scaled down voltage to AF.

The other possibility was to use the stock water temp input but i wasnt sure if the ecu used this info for any rutines/adjustments or what the voltage scale was.

Thanks for taking your time to resond to a nerd

TurboEF9

Ya.. ECT and IAT will throw check engine lights, and inhibit the vehicle from running.

88b16civic

I bought a breadboard and will be making a voltage divider and feeding the Vout into the stock O2 input. R1/R2=4 to cut the 5V to 1V. Stoik is then .5V like narrow. The only concern is that the ECU will throw a code because the slope on the voltage is reletively flat compaered to a narrowband and it will always think its reasonably close to stoik. This might only work for tuning abouve 80% throttle. Anyone have any thoughts...Ill keep everyone updated. Maybee on the plus side itll always think its close to stiok and then not do a whole lot of internal adjustments.

Heres a diagram of a voltage divider