What's the difference between a CR and PD engine?

thexav

Pro Tuner
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357
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2002 Clio 172
I know that PD was dropped and replaced with CR engines but I don't know the difference between a PD and CR engine.

Are they just different badges or do they actually mean something important.
 

obi_waynne

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From
Deal, Kent UK
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A3 1.4 TFSI 150 COD
They are different technologies, and affect the way the fuel is delivered to the injectors.

CR is superior in terms of allowing the ECU finer control of fuel timing the injectors are able to be individually controlled for duration and timing so each injector has phased control.

The PD engines create fuel pressure using camshaft driven pumps - one per cylinder it's clunky but has worked very well.

CR engines use a common high pressure pump - this is not timed or pulsed at all. The injectors are controlled electrically by the ECU.
 
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