IDI VS early PSD

[6 Nebraska IDIs]

Any ECM controlled engine will out perform a non ECM controlled one. If you have taken any classes for ECM controlled cars or understand how the ECM controls every parameter of how the engine runs then you'd understand how they do it.
Carbureted engines can be tuned for one specific climate condition, and run perfectly in that climate. However, if any one of the several parameters of that climate condition change, that engine will no longer perform at peak efficiency without retuning.
However with an ECM controlled engine, the majority of the engines efficiency related parameters are controlled via the ECM. The ECM precisely calculates the climate conditions and engine efficiency sensors, then compiles the data and makes adjustments to the engines tune to accommodate for any changes in the climate conditions. The ECM does this all in less than a second (actually probably several times every second) and does this every second the engine is running.
So putting this into perspective towards the IDI Vs PSD topic, an IDI is much like an older carbureted engine, they can be tuned for optimum performance at whatever the climate conditions were during the tuning procedure. Where, as explained above, the PSD is an ECM controlled engine and is no different than any other modern ECM controlled engine, it is continuosly tuning itself based on current climate conditions.

So basically, this is how that modern turbocharged 4 banger just whipped the pants off of your 450hp 429 Cobra Jet. Leaving you sitting there wondering how an engine less than half of your displacement just gave you a spanking, and a mile down the road is cruising along getting 35mpg. lol

 

[6 Nebraska IDIs]

I do have to add that when I was driving my brown truck this spring, I was averaging 17mpg. That's with all the mods listed in my signature. Just sayin. Its possible to get decent mileage with an IDI if its tuned well.

 

[oldmisterbill]

I didn't think there was such a thing as a 98 powerstroke

??? why?

 

[Double-S-Diesel]

??? why?

leftover 97s were branded 250hds and had the psd, the 99 body came out in 3-98
the only 98 250s were the light duty with the 7 bolt wheels, and looked like a f-150
there was never a 98 PSD truck

I had a 99 SD v-10 that was built 3/98 and bought 5/98, but it still was a 99 model