ok so i was thinking about somthing the other day i did a search but dident come up with much so hear it goes. ex-so if im driving around eyeballing a real deal wideband say lm-1 or uego not a discount cheap-o! alas i reach max boost whatever it might be and my external waste gate which is dumping into the out side world!opens up! so the question at hand is, is my wideband still reading correctly or should i be compensating for the fact that im leaking out exhaust ?

 

you're overthinking this. Why would your wideband be off? Its only going to dump exhaust out, not change the ratio which is reaching the sensor

 

Its not like an exhaust leak because the wastegate wont be drawing in outside air like a hole in the exhaust pipe would, just blasting it out. Thats what I would think anyway.

 

couldnt be explained any better....(someone will be sure to post a 3 paragraph thread on why im wrong any minute now...)

 

thanks gents its what i thought at first but it made to much sence to me right off the bat so i figured i must be wrong! i wasent sure if say i was rich and fuel is heavyer then air would it tend to leave the wastegate, which depending on wastegate position and location might be a path of least restriction there for giving me a leaner reading than it should. but your probably right and im over thinking it. thanks again guys.

 

+1, plus its reading the oxygen content within the exhaust not pressure or pressure differences.

 

the o2 mixture is evenly mixed throughout all of the exhaust gasses, you can dump out all you want and it will still get the same reading because its a ratio of air compared to burnt fuel. (whatever fuel gets dumped out, the same of air is going out with it, keeping the ratio the same.) kinda like a glass of sugar water mixed evenly, theres still the same amount of sugar compared to water no matter how much you dump out.

 

thanks guys just wanted to make sure i wasent missing or missunderstanding anything.