Problem with Boost and o2 Sensor

[b11dragone]

Ok.. after I installed my catback exhaust,upperintercoolerpiping, greddy type s bov, and k&n intake my car runs like shit at wide open throttle. it will be fine untill it reaches full boost....which also increased drastically to 19psi...then as the boost drops ,still at wide open throttle, my car starts to run better....my check engine light came on when i did all this and it is my o2 sensor past the cat...i want to know if it is the o2 sensor that is causing this problem or something else....i heard that as a safety measure when the o2 sensor is out, cars run really rich and keep the wastegate open to prevent damage....so this could be why my car is studdering cause it only does it when my car goes to the insanly high boost...when i get my o2 sensor will the boost go back to normal and my car run better...or do i have to hook up my boost contoller to lower the boost....and why would my o2 sensor go bad when i did these mods...please help...

 

[leet]

Your car is falling on its face @ WOT because you have a serious issue of boost creep. Your cars fuel system was not designed to handle 19PSI of boost. Try porting out your o2 sensor housing. It's not your O2 sensors.

 

[T3/T4GST]

The rear O2 sensor engine light is usually caused when you remove the cat. All it really does is tell the ECU that cat is working properly. If the cat is not working properly or you removed it you will likely get this light all the time. There is a fix around it.

Once you ad the catback you are opening the exhaust path which increases the possibility of boost creep. If you still have the stock turbo it is unlikely that this is happening if your only upgrades are the ones you listed. What kind of boost control do you have?

 

[b11dragone]

i have a greddy profec b but i haven't installed it yet because i wanted to wait till i changed my turbo...i still have my stock downpipe and cat...the rear o2 sensor came out of my stock exhaust and was put in my new exhaust, there was already a bung in the thermal exhaust that excepted the o2 sensor...i ordered the o2 sensor and am going to put it in a couple of days hopefully my problems will go away...but i still can't understand why my car is boosting so high