Bear with me on this. I run Evans NPG+ in my rotary-engined RX-7's and love it. In my conversations with Piers Diesel, they stated the "ideal" operating temp of the cummins 1st gen is 195º. My 92 D250 consistantly runs at the first mark, ~165º.

SOOOOO............ I wnat to flush my cooling system and switch to evans NPG+. The tstat will be change out to achieve a 195º operating temp. What inj pump adjustments need to be accomplished to optimize running at 195º?

 

The first thing to do, if you haven't already done it, is to do some temp confirmations..
Use a thermal gun to take some readings under various conditions.
Our engines like to run about 190*F. That is in the "optimum" range for proper fuel combustion/efficiency.
Having said that, you should not be using pump adjustments to alter your engine operating temperatures, that is NOT what the pump tweaks are for...
Pump tweaks change EGT's, and only in the extreme do they alter coolant temps....
If you do a good flush and fill, and still have consistently low temps then do what all truckers do... cover a portion of the rad opening.
If you are an auto tranny guy, make sure to leave the tranny cooler area clear though.
Personally the idea of having a slightly cooler operating temp is something I'm comfortable with for a couple reasons.
One, I use additives to help with cetane/combustion/burn quality.
Second, in the event of the need to really work the ole girls butt off, I like the "bit of slack" in the coolant temp that it gives us...
Third, under the circumstances we have one or two cylinders that run a bit hot to begin with... if you make a significant alteration to the daily operating temps of the engine you are raising those "hot cylinders" mean operating temps higher than they already are.

That's my story and I'm sticking to it..... ;D

Pastor Bob.