Hello all,
I heard a few comments today regarding the S50 ECU re. VANOS control.
It was suggested that the S50 ECU 'learns' VANOS cam position adaptive values (i.e. classic closed loop control), and that the learning process is affected by driving style etc etc.
The purpose of these adaptive values is to correct the steady-state error between the ECU-requested cam position and the actual physical cam position. Fine in theory, but what if the feedback loop or cam position sensors are malfunctioning or corrupt or just plain wanky (tech term) ?
Anyhow, apparently a simple ECU reset will clear the adapted VANOS position values. For some E36 M3/ZM owners an ECU reset has improved the perceived performance of their S50-powered cars.
The question is: how do you reset the S50 ECU (I assume it's an EPROM) ??
Cheers, Will
I heard a few comments today regarding the S50 ECU re. VANOS control.
It was suggested that the S50 ECU 'learns' VANOS cam position adaptive values (i.e. classic closed loop control), and that the learning process is affected by driving style etc etc.
The purpose of these adaptive values is to correct the steady-state error between the ECU-requested cam position and the actual physical cam position. Fine in theory, but what if the feedback loop or cam position sensors are malfunctioning or corrupt or just plain wanky (tech term) ?
Anyhow, apparently a simple ECU reset will clear the adapted VANOS position values. For some E36 M3/ZM owners an ECU reset has improved the perceived performance of their S50-powered cars.
The question is: how do you reset the S50 ECU (I assume it's an EPROM) ??
Cheers, Will
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