Quote:
Originally Posted by oil pan 4
EGR in diesels hurts fuel economy.
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It depends on the application. I build EGR deletes for 15L Cummins ISX engines. My customers that haul lighter loads and/or stay in the city tend to get a small increase in mileage, maybe 15% or so. The real gain is the elimination of the notoriously unreliable EGR valve that plagues these particular engines and the need to replace them every 2 years at a cost of around $1000. My customers with very heavy loads, Super-B Trains at 140,000 lbs in the mountain highways, tend to lose mileage by about 15%. I do not sell them to these guys anymore because they are never happy with the results.
In a pickup or VW TDI where overall load is very light, there will definitely be an improvement with an EGR delete.