[hayjayhorses]

I ran this truck almost 800 miles since the last post, and I like what I have experienced. I ran half of the miles empty (gross 17,260#) and the other half loaded 37,940#. I from western Mass to central NY yesterday to get the hay then from home to southern CT to deliver the hay.

I was getting less that 7mpg round trip the last few runs, This time a I did 13ish empty on my way to NY (topped off the diesel just before I loaded). I ran 65-70 mph effortlessly.

On the way to NY there is a 6 mile hill on I90 westbound that is about a 7% grade (I could be wrong). This truck has always had to run in 3rd gear like 50 mph with my foot to the floor to pull this hill, yesterday I was able to pull it 65-68 mph with about 2/3 throttle and I was able to stay in 4th gear (OD) the whole way there.

The boost was low with the red waste gate actuator hose hooked up, I could only get 11 psi and the EGT would only get to 1200*, So I unhooked the red hose and was able to do max boost of 19-21 psi and the EGT would only get to 1050*. I don’t think I am getting any turbo surge.

On the way home I was able to pull the load 60-65mph (that’s the fastest I will run loaded) with ease, before 50-55mph was a struggle. There is 4 or 5 hills I would normally be in 2nd gear by the top, I was able to hold 4th most of the time and only down shifted to 3rd, no 2nd gear on any hills. I didn’t fill up yet but judging by the fuel gauge level, I think I got 10mpg (70% loaded 30% empty) I did not refuel yet.

A few things to keep in mind, it was a picture perfect 2 days in the north east high in the 70’s and no wind. Keep in mind wind is a big factor, all winter long there is a good west to east wind, so on my way out to NY I am fighting a head wind (it can really hurt mpg’s) and on my way home I am getting a little push (it helps). Also before I put in the single shot injectors and replaced the HPOP, I was only able to get 1200psi HPOP with my foot in it, this is not a marical, the truck is just running correctly now.

As for the HPOP pressure, it will max out at 2800psi, but not until I get it to 2650rpm. It will hold 2500-2600psi @ full throttle from 1800rpm and up.

I you are scratching your head I will fill in the blanks, maybe. ’00 F550, 7.3, 290k, 4R100, billet low stall converter, 4.88, 4” turbo back, 8R19.5 Cooper C140, 6637 intake, SP TCC lock, 90cc single shots. No tuning but I need/want it.

Now for the issues, Rough idle sound like a lame cammed up gasser. Has a very high idle (950rpm) in gear, but smooth. You need to stand on the brake at a stop with the low stall TC. When cruising with a light throttle, it is a bit herky-jerky, the power is on and then off. This is what Bill should be able to straighten out.