Quote:
Originally Posted by cleanspeed1
Add a turbo if it is naturally aspirated; get all the pieces from a 740/760 turbodiesel. Diesels run on an excess of air, and the extra air introduced into the system will allow leaner air/fuel ratios during cruise ( improves mpg ), cooler exhaust gas temperatures ( better reliability ), and most importantly, torque ( so you don't have to drive "foot to the floor" all the time, once again lowering fuel consumption ).
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I say save your money and don't put a turbo on. A turbo isn't going to make a lick of difference at part throttle on a diesel (you are very light on the throttle), providing your injectors are in good shape and everything is getting burned. Sure it will provide more air and make it "leaner". But it's just more air, not less fuel.
Despite what the masses say, diesel engines do not behave like gasoline engines when you increase boost pressure or raise compression ratios without changing fuelling. And leaner and richer often don't mean anything in a diesel as long as it remains inside a certain window, namely, not too rich. Chances are your AF ratio is well within this window at cruise speeds.
My two cents? Just make sure your injectors are in good shape. Install new nozzles if you haven't already. Sounds like you are getting awesome fuel mileage already!