Thanks for coming to Just Answer to ask a question.
Different expert here
Its your truck and you can do with it as you please but any modification you do which causes damage makes you now the warranty company meaning your now liable for any and all failures. Which is just not limited to the engine alone. It can also include the transmission and axles and steering and brakes and AC cooling.
Diesels a re made to last and there made to last because they are detuned so they dont work so hard. Once you surpass this limit then you open your self up for premature fatigue and stress.
The 6.4L does not have the head bolt concern like the 6.0 so this is not an area of concern. This truck meets emissions compliance. So if you remove the DPF i nthe exhaust thats a federal crime punishable with a 10,000$ fine. If you replace the air filter assembly you will disturb the MAF and cause high emissions and destroy the DPF exhaust. If you chip or program it then there is no need to take it back to the ford dealer since the warranty, all 100k of it is void.
The best mods I have seen on the ford diesel are edge, and bully dog and banks but those were on 6.0L's. I have not had a vehicle come in for warranty repairs on a 6.4 which has been modified. There warranties were voided at the front desk and not in the techs stall.
So to answer the questions:
Can I safely chip a new 2008 F250 6.4L Powerstroke Diesel for fuel economy and not damage the engine/turbos/etc? NO
I just got the truck a month ago, love it, but only get about 14-15 mpg. For an engine this big and a truck this heavy and setup to tow this much weight 15mpg is not bad.
Northwest Customs suggests a superchip ($400), and possibly air intake and then exhaust. These places sell parts, there in no connection to ford or navistar and dont care if you tear up your truck. All they want is to sell parts at whatever expense to the customer.
You run the risk of a 10k fine, 22k engine, 4k engine. Then who is to say these parts will not also fail from the mods. So this can be a endless cycle just to get a few more mpg. It would take alot of mpg in crease to warrant these costs.
Not the answer you probably wanted but the correct one from a ford wrench turner whom deals with ford tech hotline and mad customers blaming ford for there 1000 ftlb torque engines tearing up.