Haltech E6A - Manual (Page 58)

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6.3 Full Throttle Map
The manifold and throttle body design can also cause problems tuning at full throttle on
normally aspirated engines. In some cases, the manifold pressure can reach close to
atmospheric pressure before full throttle is reached. This means that bars close to the full load
bar on the Fuel Maps can interfere with the full load bar due to the interpolation between the
two bars.
If you are experiencing difficulties maintaining air : fuel ratio at full throttle, it may be
necessary to use the Full Throttle Map to set the full throttle mixtures. The Full Throttle Map
is activated above the value set in the Full Throttle Threshold in the Fuel Setup, and has one
programmable bar every 500 rpm up to 16000 rpm.