Fuel cutoff on overrun - an alternative method

Give input on tuning as well as any tips and tricks you may have. Also feel free to share base mapping files for various engine types.
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rjwooll
Posts: 81
Joined: Wed Jan 28, 2015 5:42 am
ECU Model: S40 Pro
Distributor: Lotusbits
Firmware Version: 75

Fuel cutoff on overrun - an alternative method

Post by rjwooll »

I have posted before that this feature, when set, can cause snatching when the throttle is released - as it suddenly cuts fuel to zero when throttle position hits zero.

Today, I successfully tested an alternative method which doesn't use this parameter at all. I set the fuelling to zero at throttle position zero above 1250rpm on the main fuelling map. Cutoff now comes in more softly - I guess because the system is fuelling to an interpolated value between the next throttle position and zero, rather than suddenly hitting zero.

This should, incidentally, fix a minor bug that I noticed whereby the real time monitoring screen still shows fuelling even when the cutoff parameter is active. I guess it just shows what should be happening according to the fuel map.
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