Hi Guys,
Done a search but nothing has come up.
Just in middle of wiring up the first of the LS400's , waiting for a hose so should have it running next weekend. Because the engines are pre 1995 we can run here (UK) without cats, and therefore there is an opportunity to ditch the second set of O2 sensors ( sub o2 sensors as they are called.)
Two questions. ( Long ones however.)
1. If we run without the sub O2 sensors will it buggar up the fuel maps in the ECU, ie will the engine run badly? I read the manual and it states that the second set of sensors gives feedback compensation and corrects the "skip amount" generated by the initial information from the main O2 sensors. If I read this correctly basically the sub sensors back up the main sensors and fine tune the AF ratio. If I ditch the sub sensors would I really notice a drop off in performance.
2. If we run without cats and use the sub O2 sensors will the ECU recognise that the cats are absent/ non functioning and default to emergency settings, ie run inefficiently. Will the absence of cats affect the ECU in any way?
Of course we will always run with pre cat sensors in situ so the ECU will be getting most of the info it needs to run closed loop.
Thoughts please.
Cheers,
Tony
Done a search but nothing has come up.
Just in middle of wiring up the first of the LS400's , waiting for a hose so should have it running next weekend. Because the engines are pre 1995 we can run here (UK) without cats, and therefore there is an opportunity to ditch the second set of O2 sensors ( sub o2 sensors as they are called.)
Two questions. ( Long ones however.)
1. If we run without the sub O2 sensors will it buggar up the fuel maps in the ECU, ie will the engine run badly? I read the manual and it states that the second set of sensors gives feedback compensation and corrects the "skip amount" generated by the initial information from the main O2 sensors. If I read this correctly basically the sub sensors back up the main sensors and fine tune the AF ratio. If I ditch the sub sensors would I really notice a drop off in performance.
2. If we run without cats and use the sub O2 sensors will the ECU recognise that the cats are absent/ non functioning and default to emergency settings, ie run inefficiently. Will the absence of cats affect the ECU in any way?
Of course we will always run with pre cat sensors in situ so the ECU will be getting most of the info it needs to run closed loop.
Thoughts please.
Cheers,
Tony