29th December 2018, 02:24 AM
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Senior Member
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Join Date: Jan 2014
Location: Belgrave, Australia
Posts: 803
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I learned a little lesson from someone on here about EGR on the D3's (and presumably other FSI engines) where the valve overlap between exhaust and inlet strokes is such that some exhaust gases remain in the cylinder for EGR purposes.
EGR should have been fitted to all petrol engines since the 70's. Its purpose is to reduce the production of Nitrous Oxides formed during high combustion temperatures (by reducing combustion temperatures). It does so reasonably successfully, but at a cost to engine efficiency.
So far as emission requirements are concerned, the D2 should have EGR in some form. But in the case of the D2, the indirect injection helps to wash the inlet valves with solvent (petrol).
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Cheers
Marty
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Current:
2001 Audi S8 - Brilliant Black with Black interior, C5 RS6 rims (whenever I actually put them on...), Solar Sunroof, Tinted side and rear glass, RNS-D, Grom, Bose, clunky old phone in arm rest!
2002 Audi S8 - Project
Replacement head coming arrived  thanks to MJ
Silver with Black interior. All features as the '01, with the 'S' mode auto shifter. Dodgey rear tint (need to find a way to get rid of that).
Family:
2009 Volvo XC90 V8 R Design - has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car!
Sold:
1997 Audi A4 - Hamilton's Club Sport, Achat Grey (will miss the old girl)
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