Quote:
Originally Posted by
66T
Euro 4 must be tough. As we all know, the xt motors run as lean as ******y stock, with air injected exhausts and cat converters.
I don't know what one could do to clean up any engine more than that. Maybe multis can run higher compression, even leaner settings with direct injection and hotter exhausts than singles can.
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Euro 4 is tough. You just can't get an engine to pass these new stringent emissions tests by simply making the fuelling leaner because older engine designs are at their limits of coping with overly lean A/F ratios as they are at the moment. To meet the new standards combustion chamber design, compression ratios etc. and ever more complex engine management systems are required, which is all very expensive. We've gone past the point where an old engine can be made to be clean, new engine designs from the ground up are needed to achieve the desired results ...or cheat like VAG does!
