406 xud engine

[ally406]

It's 99% the same, the ECU on the 406 doesn't really do much, it can apply some injection advance (up to 20 degrees) based on information from the needle lift sensor on the injector, temperature sensor and crank position sensor. Likely you will want to swap the pump for a pure mechanical pump to make life easy, you can leave everything else as is I would think. The injector with the needle lift sensor will work fine without the sensor being plugged in.

I can vouch for this, it's what I ran in my old xud.

Incorrect.

This pump relies 100% on the ecu for dynamic timing.

The pump will retain full IPP 100% of the time, and uses an electronic valve ot regulate presure to one side of the timing piston.

Without the ecu, you have fixed injection timing, fixed injection timing will run like utter poo.

I think we are arguing the same point? What we have said is do away with the AS3 and fit a full mechanical pump, and get rid of the ECU? Without the ECU, the AS3 pump defaults to 20 degrees advance, resulting in bag of spanners like running.