M1tch Posted December 12, 2018 Report Share Posted December 12, 2018 Hi all, I currently have my Bosch LSU 4.9 wideband attached to one of my exhaust manifold bungs (there are 3 on my engine, 2 in the exhaust manifold and 1 post cat) so I am getting readings from a combination of cylinders 2 and 4 which is giving me a stable reading. I have a full race manifold to go in which doesn't have any O2 bungs in it, would it be ok to use the post cat bung location or should I see if I can get a bung welded into the pre cat pipework just before the cat? I am guessing that the AFR would be slightly different post cat, however I know that a lot of dynos use an exhaust sniffer in the backbox which would be post cat for tuning. The engine is currently NA but will be running a turbo at some point in the future (with a bung in the downpipe pre cat) - was just wondering if I would be ok to run the wideband sensor in the post cat position until I swap to the turbo setup - I guess I could log the AFR in the current location and then again in the post cat location to see how much it might be different - guessing something like 0.5 AFR points perhaps. Anyone have experience on this matter? My current fuel table is pretty close to the target AFRs I am aiming for and am currently using the auto fuel correction option to adjust where needed - not wanting to run the engine lean if its trying to fuel differently to the current table. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
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