Just installed a TXS tuner into my car off of a freinds WRX. Im getting my utec tomm and thought it would be a good idea to have a wideband reading. After installing it all i read is 14.5-14.8. whether im idling or WOT at redline my AFR stays at 14.5-14.8. I plugged the plug into the bung on my TXS midpipe and i powered the tuna from the cigarette lighter and grounded it off the parking brake. anyone have any ideas whats wrong?


ERIK

 

You may have a fault with the sensor.

If you have a UTEC then disconnect the serial connection between the UTEC and the Tuner. Use a laptop to display the "dashboard" and see if there are any error messages displayed. Start the engine and give the engine a quick rev. See if the AFR goes rich (reads less than 14.7) then goes lean (reads greater then 14.7).

Contact the TurboXS USA guys with your results.

regards
Pete
(TurboXS)

 

Well i went for a ride with it and the afr in 3rd gear pulls would get down to about 14.53 near redline and then climb back up to 14.78 when i got off the gas, so i guess it is working the way it is supposed to?

 

Its possible you have a defective O2 sensor.. another possibility is the sensor is on the secondary O2 sensor bung after the CAT.. Or its possible you need to perform a free air calibration on the sensor before you try to use it.

 

it is in the midpipe right now, is it supposed to be in the bung that is on the manifold?

 

I think this is possibly the best answer, if so you need to pull it out. also check all your wires and make sure the ground is on firmly possibly if you have someone elses car check and see if it works on theirs. And if everything is working fine with the tuna then you need your car tuned badly and you should be calling for a lot of

 

Not really, you should be running considerably more richer and a lot leaner during deceleration.

Give the TurboXS USA guys a call on Monday.

regards
Pete
(TurboXS)

 

Yeah, I agree with Pete, one thing we forgot to mention is that at higher RPM at WOT, you should be running very rich, 14.7 is the stoichiometric optimum air fuel ratio, at cruise you'll see that in closed loop operation.. But when your tuning and running at WOT, you'll see a tip-in ratio in the 13's very quickly getting richer to 11.8 and even richer to 10 or off the scale rich (depending on your mods since higher boost and other things will affect it)

Now, most of us who have installed their tuner, have had a bung welded in and installed it in the downpipe as close to the turbo's outlet as possible but not replacing the existing sensor. It sounds like you installed yours in the bung where the secondary O2 sensor usually is.. This may result in leaner results, but if you have a Catalytic converter on the car, and the wideband is installed after the catalytic converter, it will read pretty lean (Don't know if it will read THAT lean though)

Since it reads so little variation, it sounds like the sensor may be defective.. HOWEVER, since you state you have an aftermarket midpipe (I can assume its the pipe with the bung that occurs after the catalytic converter or test pipe) its possible that the portion of the pipe has a "CEL eliminator" fitting designed to allow the secondary O2 sensor to function correctly without a catalytic converter.. If thats the case, then it could explain that your getting the reading..

First thing you need to do.. Go to a muffler shop and have them weld the bung in the downpipe, about 8-10" from the turbocharger's mating flange.. Make sure they give you a plug to plug the bung when not in use..

You will need this fitting if you didn't already do it regardless of the tuner since its good to have it there should you ever get the car dyno tuned.

Also, at the soonest opportunity do a free air calibration of the sensor.. You describe that you got this tuner from a friend with a WRX, so the sensor itself may have become poisoned by leaded gas, or just damaged when it was removed and reinstalled.. So its probably a good idea to pick up a new sensor anyway.

 

Got it working. I guess when me and my freind pulled the cable out of the firewall on his WRX we snapped a wire. I had to put it back together and now it works perfect.

Now i just need to fix my forge DV so it stops stumbling and fluttering.


ERIK

 

Cool.. Nice to hear it was something relatively minor..

 

Good to hear everything is fine.

regards
Pete
(TurboXS)