I'll be taking the car to a tuner who uses the factory ecu with a SCT chip.IMO, dual wide bands at a minimum - one for each bank. Skip the narrow bands.
OR if you can afford it, thermal couples in each primary pipe..$$$
I just realized I was assuming that you will be using an aftermarket ECU for tuning?
Thanks Kevin. I'll probably run a single WB in the downpipe. I'm not quite sure how to wire it in to the factory ecu.That's a bit tricky b/c the MFR's say that the O2 sensors can't withstand the temps pre-turbo but there are adapters/heat sinks that help dissipate the heat from the sensor. People have put the sensors pre-turbo and had no issues so I would look into this
Can that type of system tune each cylinder or each bank? If not then maybe just installing one O2 in the DP is all that is needed. There are a lot of people that have used only one sensor in the DP too so this is your call on which way you want to go. More than likely for a street car one will O2 suffice but you could also install bungs pre-turbo and post-turbo for future setups.
I'm not sure you can. I think you will need a standalone WB system not just the O2 sensor.Thanks Kevin. I'll probably run a single WB in the downpipe. I'm not quite sure how to wire it in to the factory ecu.
I see what you're saying. I'm a little confused on this turbo stuff but I'm learning. I'd like to maintain the factory narrow band O2's for their factory designed functions. I got confused by a statement someone made about using a WB and getting rid of the factory NB's. I think they have a standalone ecu.I'm not sure you can. I think you will need a standalone WB system not just the O2 sensor.
Example: I use two complete AFX systems one for each down pipe:
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I'm wanting to use the narrow bands for normal ecu operation so the biggest decision is where to place them. The WB will be nice for monitoring afr's visually. I've never had a turbo setup so I'm in a learning curve.Good topic. I've found using a single wideband in the downpipe works well in a blowthrough carb application, multi port EFI has its problems with this setup. Try tuning around an intermittently problematic injector using a post turbine wideband.
Would I run just one narrow band in the dp and shut the other off in the tune?You should run the 02 sensor in the dp. Best setup for you would be to run a wb to log and narrow bands to the ecu. They do make wb's that do put out a 0-1v signal if you don't run to run that many 02s. I have never used them.