Technical Single Turbo O2 sensor install and data

nyt

Sergeant
Sep 15, 2019
288
253
0
Ride
2010 335xi
how much boost do you have. i saw with other speedtech setups that till 30-32 psi there is no problem. (ADV backpressure 35 max.)

It may have started after bringing the boost up above 30psi or so, but happens even at 20psi now. Also, bank 1 and 2 were off by about 0.8, with bank 2 reading lean. When I pulled my plugs, bank 1 was clearly running lean and bank 2 was not. Have new sensors on the way. Are you still running the ADV? Are you happy with them still?
 

Scorpstan

Specialist
Feb 27, 2017
96
99
0
Ride
335i
if they get damaged one time than its over.
on 30psi they should work.

yes still on advs. this time with bigger AR and less boost (30psi) same HP level. testing Phase will be in mai. waiting for my 6hp28 Adapter.
 

dubgtr

New Member
Nov 4, 2021
9
0
0
Are all these results with Docrace manifolds for their Top Mount mani? If so, does anyone have info on how well the log style bottom mount manifolds do with those sensors? I'm installing a bottom mount kit this weekend (or about as much as I can finish) and I plan on installing new NTK sensors, mostly because NGK has always been good to me, and after working at a vw dealer for 5 years, Bosch left a bad taste in my mouth. Oh and because of the lack of a need for new calibration data. I'm interested to know how many are using log mani's. Mine has heat syncs installed and where the bung attaches to the manifold the hole drilled in the mani is actually smaller than the bung. I'm thinking it will limit some of the direct flow from the exhaust ports and the o2 will get whatever gas happens to flow up through the hole.
 

rac

Sergeant
Nov 14, 2016
312
171
0
Australia
Ride
135i ST
Are all these results with Docrace manifolds for their Top Mount mani? If so, does anyone have info on how well the log style bottom mount manifolds do with those sensors? I'm installing a bottom mount kit this weekend (or about as much as I can finish) and I plan on installing new NTK sensors, mostly because NGK has always been good to me, and after working at a vw dealer for 5 years, Bosch left a bad taste in my mouth. Oh and because of the lack of a need for new calibration data. I'm interested to know how many are using log mani's. Mine has heat syncs installed and where the bung attaches to the manifold the hole drilled in the mani is actually smaller than the bung. I'm thinking it will limit some of the direct flow from the exhaust ports and the o2 will get whatever gas happens to flow up through the hole.

if the system is dead ended there might not be any flow up to your sensor, you will not get very good afr readings if the gas their stays stagnant.
you would be relying on good turbulence to get that gas turned over - i hope the hole is not too small and your not set back too far. if i understand your set up correctly.
 

nyt

Sergeant
Sep 15, 2019
288
253
0
Ride
2010 335xi
My issues don't seem sensor related. I've captured some logs where it goes open loop before sensor leans out. Something is just disabling bank 1, and not sure what.
 

rac

Sergeant
Nov 14, 2016
312
171
0
Australia
Ride
135i ST
My issues don't seem sensor related. I've captured some logs where it goes open loop before sensor leans out. Something is just disabling bank 1, and not sure what.
is this happening on start up? the dme does start up checks bank to bank on afr response, if it doesnt like what it sees it throws the banks that it thinks has an issue into open loop.

i cant recall all of the incidents as i had so many teething issues, googling my own username and open loop i found this: https://www.n54tech.com/forums/showthread.php?t=51137

anyway point being there's a good chance that the sensor is not reporting what the dme expects either because the amount of fuel or the returned afr is not matching what it expects and then goes into open loop. that's a safety mechanism such that closed loop fueling based on dodgy information doesnt spiral the actual afr in the wrong direction.
 

nyt

Sergeant
Sep 15, 2019
288
253
0
Ride
2010 335xi
is this happening on start up? the dme does start up checks bank to bank on afr response, if it doesnt like what it sees it throws the banks that it thinks has an issue into open loop.

i cant recall all of the incidents as i had so many teething issues, googling my own username and open loop i found this: https://www.n54tech.com/forums/showthread.php?t=51137

anyway point being there's a good chance that the sensor is not reporting what the dme expects either because the amount of fuel or the returned afr is not matching what it expects and then goes into open loop. that's a safety mechanism such that closed loop fueling based on dodgy information doesnt spiral the actual afr in the wrong direction.

No, under load it kills bank 1. The greater the load and higher the rpm, the more likely it is.
 

dubgtr

New Member
Nov 4, 2021
9
0
0
if the system is dead ended there might not be any flow up to your sensor, you will not get very good afr readings if the gas their stays stagnant.
you would be relying on good turbulence to get that gas turned over - i hope the hole is not too small and your not set back too far. if i understand your set up correctly.
If you imagine a hole about an inch in diameter, then about an inch down from that hole there is a hole about a half inch in diameter. Thats what it looks like, actual sizes aside.