where do you mount the o2 wideband on a rear mount turbo?
02-25-2010, 06:32 PM
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where do you mount the o2 wideband on a rear mount turbo? I am asking this because in my AEM instructions it says on turbo engines you must mount the o2 sensor after the turbo?? I know that someone out there has delt with this so let me know???
02-25-2010, 07:32 PM
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looks like i need to relocate....but thats where i dont understand...Air/Fuel ratio....it would be measuring the amount of air(BOOST) compared to fuel(INJECTORS PUTTING INTO MOTOR TO HAVE MOTOR BURN/USE) right after the source....the motor and pre turbo....
but what's the difference in putting in right after the turbo in the DP when you have pressure there....same as coming out of the front side just pushed further back....and not to mention you have your exhaust side spinning creating a pressure as well?? i would think you would get a more distorted reading from the back due to the O2 exposed to more CLEAN air from the open end of the exhaust.....IMO...clear this up...??
I think to be able to read the appropriate ratio you should measure the pressure or AIR being thrown back out of the motor and FUEL as in the combo being put together making exhaust to spool the turbo....and read that to make adjustments to boost....just keep it in a constant circle...not one that cuts off with exhaust pressure mixed with possible exposure to outside CLEAN air...just a thought...
but what's the difference in putting in right after the turbo in the DP when you have pressure there....same as coming out of the front side just pushed further back....and not to mention you have your exhaust side spinning creating a pressure as well?? i would think you would get a more distorted reading from the back due to the O2 exposed to more CLEAN air from the open end of the exhaust.....IMO...clear this up...??
I think to be able to read the appropriate ratio you should measure the pressure or AIR being thrown back out of the motor and FUEL as in the combo being put together making exhaust to spool the turbo....and read that to make adjustments to boost....just keep it in a constant circle...not one that cuts off with exhaust pressure mixed with possible exposure to outside CLEAN air...just a thought...
Last edited by Rossko85; 02-25-2010 at 08:00 PM.
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02-25-2010, 08:04 PM
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[QUOTE=ZL1Killa;12949440]YES!!. seen it in person. above 4psi the wideband goes kapooey and rails out at 18:1 AFR
I havent had that occur yet??? we have been tuning on mine with no problems? afrs run pretty steady throughout....
I havent had that occur yet??? we have been tuning on mine with no problems? afrs run pretty steady throughout....
02-25-2010, 08:18 PM
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I've been running two AEM's(one per each bank) in the post cat OE O2 locations for a few years now and never had an issue. And mirror results/readings from dyno tune.
02-25-2010, 08:21 PM
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Im thinking this might be ok because there will be significantly less pressure in those locations then where we would have to be placing it on our front mount setups(close to manifolds).
02-25-2010, 09:04 PM
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ok so whats the verdict? Mine is simply in my single exhaust downturn right after the motor and before the race pipe where my cat used to be....you have to look at to how many people have been boosting for years with the 02's near manifolds.....mine was set custom on the downturn...i am a manifold car myself...FWD at that...so my exhaust collects from two manifolds into a singe pipe....then dumps under the car and back from there....but my O2 sits right on the neck.....
remember this is a FWD LS4 that is RM with exhaust manifolds which includes a crossover and this is the aftermarket downpipe and race pipe in place of the cat where they collect....
remember this is a FWD LS4 that is RM with exhaust manifolds which includes a crossover and this is the aftermarket downpipe and race pipe in place of the cat where they collect....
02-25-2010, 09:13 PM
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im lost! If i was going to mount it before the turbo which side should i mount it(i heard one bank runs leaner than the other). Would i mount it just after my first narrow band o2 or further down the pipe??
02-25-2010, 09:57 PM
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i used a lm-1 ; and right above 4psi it rails out. this was placing it in the exhaust stream TO the turbo.
then moved it to the exhaust stream OUT of the turbo and works great
then moved it to the exhaust stream OUT of the turbo and works great
02-25-2010, 09:57 PM
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ok so whats the verdict? Mine is simply in my single exhaust downturn right after the motor and before the race pipe where my cat used to be....you have to look at to how many people have been boosting for years with the 02's near manifolds.....mine was set custom on the downturn...i am a manifold car myself...FWD at that...so my exhaust collects from two manifolds into a singe pipe....then dumps under the car and back from there....but my O2 sits right on the neck.....
remember this is a FWD LS4 that is RM with exhaust manifolds which includes a crossover and this is the aftermarket downpipe and race pipe in place of the cat where they collect....
remember this is a FWD LS4 that is RM with exhaust manifolds which includes a crossover and this is the aftermarket downpipe and race pipe in place of the cat where they collect....
02-25-2010, 10:02 PM
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My AEM is mounted in the I pipe, works good. Tried mounting it after the turbo but my exhaust was to short so my readings would go lean at different rpms because of reversion.
02-26-2010, 06:31 AM
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Your exhaust will never go into "reversion". I have a 10 inch exhaust off the turbo on my car, and with the wideband about 8 inches down, I have never had a false reading.