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Beitrag: [QUOTE="JohnM, post: 575525, member: 9191"] Hi Mel You've got the point I was making. I accept that the ECU will adjust the fuelling +/- depending on lambda readings. Most but not all systems only operate in closed loop mode up to a certain rev limit and only up to certain throttle openings. I thing Russ is of the opinion that the EDS phase3 chip operates in closed loop all the time. The only manufacturer that I know who uses closed loop continuous operation is Honda. However they do not use the same type of lambda sensor. They use a UEGO. This has a much wider range than the usual lambda sensor.,(HEGO). Its output is much more linear and far more accurate. It does not suffer the same degradation in performance with age as the HEGO type as fitted to the Calibra. Hence my concerns. I would be very happy to see a Phase chip produced that operated continually in closed loop mode and that utilised 1 or even 2 UEGO's. I would probably be first in line to buy one. Unfortunately the UEGO is not a direct substitute for the HEGO as it requires a seperate controller. A little more information on the exact working of the Phase chips would be welcome. And if anyone from EDS reads these posts........any chance of a system using the Bosch or NTK UEGO? JohnM [/QUOTE]

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