Haltech E8 - Manual (Page 41)

Haltech E11/E8 Instruction Manual
• Decel Cut Delay - This is the time in seconds that the ECU will wait before starting the decel cut
phase, after seeing a zero throttle condition. This delay stops any unwanted fuel cutting or ignition
changes between gear changes or momentary zero throttle conditions.
• Max Decel Cut Retard - The amount of ignition retard used to smooth the transitions to fuel cut.
• Decel Cut Enrich - Upon restore of deceleration cut, the intake manifold walls will be completely
dry. This enrichment factor will eliminate any lean conditions upon fuel being restored.
The following example assumes a constant load so that injection times and advance does not vary. Of
course this is not realistic since load will change with movements in TPS. The example aims to simply
demonstrate the timing interaction of fuel and ignition in the event of a deceleration cut condition.
Figure 36 - Decel Cut Cut Illustrated
Maps Group
• WOT Map Enrich - Click on the check box to enable the use of the WOT map. When the throttle
position exceeds the WOT value. When the WOT map is used and the WOT condition is met, the
injection values are taken from this map and the base fuel map values are ignored.
• Zero Throttle Map Enable - Similar to the WOT map described above, but for a zero throttle
condition. This can help some cars achieve a stable idle.
• Fuel Map Select - This selects which map to use. If an external input is used to select the map,
then this setting is ignored.
Throttle Pumps
Throttle pumps aid in improving engine response when the throttle on a conventional fuel injected vehicle
is opened rapidly. The throttle pumps work by adding additional injection pulses (asynchronous
enrichment) and enriching the current fuelling pulses (synchronous enrichment) when it sees a change in
throttle position. The throttle pump setup allows the tuning of:
* How much enrichment is needed for a given RPM, throttle position and TPS rate of change.
* The biasing of the enrichment between asynchronous and synchronous types according to a given RPM.
* The speed at which the synchronous enrichment decays.
Copyright © Haltech 2008 Page: 41
TPS
Ignition Advance
Injection
Time
Injection
Time
Advance
TPS %
Decel
Cut
Decel
Cut Restore
ignition