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Sub8 Sub8 is offline
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Join Date: Aug 2014
Location: PA
Posts: 65
Disconnecting the hego sets the duty cycle to 50% at the frequency valve.

You still get 65% duty when cold.

You still get 65% duty cycle when throttle microswitch opens, for 2sec.

So easiest way is just disconnect the hego, assuming everything else is working correctly.

Lambda does not give you continuous enrichment at WOT, only a 2s burst of 65% duty cycle.

Without hego fuel control pressure at the WUR can be modified to make WOT leaner or richer. Of course your part throttle cruise AFR will also be affected by this. This is an area that the hego system can help with as when closed loop it will still target a lambda of 1 helping fuel economy.

Same true the other way as well; if you want it slightly leaner at WOT. But without the Hego if you go in this direction you will have drive issues at part throttle as you are now lean of stoich fuelling (lean misfire).
Old 04-26-2018, 06:36 AM
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