where to put o2 sensors on Turbo Buick 401 Nailhead

i run a F.A.S.T dual o2 sensors and i want to know where i should run them in the exhaust with the turbo. bank1 before the crossover and than bank 2 after the exhaust of the turbo? would like to moniter both o2 sensors.
Thanks Paul

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hmm.. before and after the turbo...    you are probably better off with oxygen sensors in both exhausts before the turbo.. as there is NO combustion inside the turbo like there is in a catalytic converter.. so the oxygen ratio in the exhaust stream should be about the same..

with an OBD2 system.. there are sensors after the cat to verify the outgoing exhaust is clean from the cat..    measuring a cat at 2500 RPMS.. if the fuel trim is proper its 100F hotter on the output than on the inlet.. both are above 1300F..  this is perhaps what, why you were thinking this..

but i could be totally wrong..

i am taking that you are running the full EFI .. so left and right bank would be left and right fuel trim..  since it looks like you might  running a dual plane intake..  


you can install bungs in several locations.. and leave them plugged..




i am taking that you are going to create some heat shields for the long pipe from the left side of the motor under the crank pulley to block some of the infrared radiation from melting things like the harmonic damper rubber and the pulleys and the  fan belt.. perhaps the radiator hoses. thin polished stainless is enough to block the radiated heat and not have enough mass that air flow cannot cool it almost instantly and still look good..   " (O "  if you get the idea as the O is the pipe and the ( is the thin heat shield that only wraps part way around the pipe..


on a similar thought course..  there is a company.. who has created for piston engine aircraft.. oxygen sensors and pyrometers for each cylinders exhaust with a display on the instrument panel. this allows the pilot to monitor the exact fuel trim for each cylinder..  as many piston engine aircraft have manual control over the air fuel ratio..  to cope with different altitudes and power needs..  they came up with specific flow injectors to allow each cylinder to receive the exact amount of fuel to match the airflow needs of the good and the bad ports of the intake..  so the pilot can lean it out and without melting pistons..  

Nice build.  
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460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005
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October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power."
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"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad