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Thanks for the reply Treeve. So can you elaborate on the cycling a bit? I do run the standard GM ECU with GM supplied (presumably) narrow band O2 sensors, so does my ECU do that cycling?
The test we do over here, called a 5 gas test, is just done with car in neutral and engine revving at 3000 RPM. Will the engine exhibit the traits you suggest in this test mode?
Also I wondered if running a touch richer might help reduce the NOx (at the expense of some Hexane) but then again, the engine is prolly running closed loop at the test point so I may not be able to effect much of a change.
Thanks again.
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Tim
FFR Mk4 Roadster
HSV Clubsport R8
Last edited by Jethrow; 05-29-2015 at 07:35 AM..
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