7.3L to 6.7L comparison
I replaced my '99 7.3L with a '15 6.7L recently. The two trucks are as identical as you can make from the order book: Supercab F350 dually 2WD Lariat 3.73 gears. For several years I have made the driv...
Forum Discussion
This '15 is 14,000 GVW, the '99 was 11,500, both dually F350. Which means in California, it isn't a pickup anymore.
With these highly electronically controlled engines, the amount of boost is set as much for smog and other engine management as for power. The '15 has no waste gate, but a variable vane housing. That's also what they are using for the exhaust braking function. The 30 psi was absolute manifold pressure read from the OBD port, so only about 16 psi above atmospheric. I think they run up to about 40 psi absolute.
One of the interesting byproducts of the immense electrical complexity is the ability to monitor literally hundreds of parameters via an OBD scanner and aftermarket display device (I'm using my iPhone with ForScan lite). There are four EGT sensors scattered down the exhaust system to watch, boost, turbocharger vane angle, DPF particulate load and back pressure, on and on. Occasionally I even look out the windshield too!
With these highly electronically controlled engines, the amount of boost is set as much for smog and other engine management as for power. The '15 has no waste gate, but a variable vane housing. That's also what they are using for the exhaust braking function. The 30 psi was absolute manifold pressure read from the OBD port, so only about 16 psi above atmospheric. I think they run up to about 40 psi absolute.
One of the interesting byproducts of the immense electrical complexity is the ability to monitor literally hundreds of parameters via an OBD scanner and aftermarket display device (I'm using my iPhone with ForScan lite). There are four EGT sensors scattered down the exhaust system to watch, boost, turbocharger vane angle, DPF particulate load and back pressure, on and on. Occasionally I even look out the windshield too!
