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I don't think the ABY/ADU engines have an EGR system. At least they don't show one on ETKA for them.
I know the PD Diesel boys have found that by decreasing the cycle on the EGR valve they can increase power and spool up on their turbos. Revo have done it on a PD 150 Golf for one of the lads in our Coventry workshop. He's now running 200bhp+.
No EGR on all 20V turbo I5 engines that I know of.
The 3B, AAN, ABY & ADU do have an EVAP system for venting fumes from the fuel tank, and they do have a PCV system for recirculating blow-by fumes (and yuck oil vapour) from the crankcase back to the inlet... but definitely no EGR.
EGR is for nothing but better emissions. Its crap and who helps it. The S2 was never fitted with it. As for the Mondeo system..... best off replacing the valve for a couple of blanking plates. EGR casues many running faults on nearly every make and model of car. Especially diesels.
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Tom C - www.rcmr.co.uk
Audi UR Quattro
Audi 100 C3 2.0 5 cyl 115ps
Audi S2 - 07k engine project aiming for 800ps
Audi B5 RS4 645ps 911nm
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