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Rawze

You said it was recent;y rebuilt.. all OEM internals and OEM head?... or after-garbage?.

I am suspecting some after-garbage was used for either the overhaul kit.. or the head?.. or a repaired head?... and not all brand new OEM only? - This assumption for the moment, considering you already said you tried used turbos and other used injectors and crap that was shoved it into an otherwise, should have been precision-built $40,000 commercial engine.

And who knows the quality (or lack thereof) of the overhaul process it went thru.

Every time someone tries to cheap-out on these engines.. it costs them waaay more than if they would have simply gone all in and done things 110% right. And if someone cannot afford to do things right then they should park the truck and go get a company job for a while if need be, so that they can save up towards getting things done correctly, re-group, go thru, and invest in the equipment properly. otherwise, it is nothing but a headache.

You claim it started smoking all the time. .. How and when does it smoke?. Black smoke?.. white smoke?... is there any blo-by coming from the oil tube when you idle it with the oil cap off it?.

Has the crank case filter been bypassed, drilled out, or a maintenance-free one installed?.. so that the engine crank-case can breathe without restriction?. Any crank case pressure buildup at all, and the turbo is going to bleed oil fumes and slobber into the intake.

Also... some engines, after a fresh overhaul, can take as many as 80k+ miles before they break in good and stop smoking a bit.

What boost is it making now that the used crap turbo was replaced with a proper OEM one?.

You claim is had poor performance.,. but then you say its over-boosting a bit. If it is getting above 34 psi in a hard pull.. then have the turbo programming adjusted down a tiny bit so that it only goes to 34 psi.. and this is NOT a sign of poor performance.. but a sign that it is making close to, if not full power.

You also claim it has terrible fuel mileage.. but you don't mention what that is?... what kind of freight you haul>?? what speeds do you run?.. and areas of the country you drive in?... etc? ..

What make/model truck?.. your tag says Pete 579?. if so then at least its an aero truck. - What is the rear end ratio?. and is it an auto-s$itter?.. or stick?.

... and are you driving by your boost gauge and driving it below 63 MPH? .. keeping it under 20-psi to help save fuel?.. and to lower operating costs ??? - I would say likely not if your claiming ita making 35+ all the time.

your doing a whole lot of complaining.. but none of your posts imply or seem to tell us that you are actually doing much of anything about it except throwing parts i=at it. The DRIVERS RIGHT FOOT IS 80% RESPONSIBLE FOR ALL FUEL MILEAGE AND PROFIT MARGINS IN TRUCKING!!!.

Getting the engine healthy and keeping it healthy by keeping it in tip-top shape is the next thing towards this, and you cannot do this if someone is shoving used and after-garbage parts at it, trying to save moneys .. so that it can cost them 2x-4x more in maintenance, more down time, and poor fuel mileage, because none of it works like it should, or was not done correctly.