I put a HPOP gauge on my truck today.

[hayjayhorses]

here is a pic of the pushed up square O ring, just a note the only part of the O ring that is pushed up is were the opening is oh the steel ring that holds it down.


How can I make the pics bigger??

[Kwikkordead]

Subscribing.

[hayjayhorses]

so i put in the single shot injectors got the truck started after a few tries and it idle nice for about 10 minuets, then cut out. Now it cranks over make oil pressure at the resivoir but no HPOP pressure, using a mechenical gauge.

I checked all fuses, the fuel heater curcit has power.

Mabye I have some crap in the IPR vavle? I am going to pull it and check it out. If some one has a sugestion you can call me I will be out in the barn working on it.

413-222-8286

[hayjayhorses]

It turns out the HPOP crapped out I had a few hanging HPOP hanging around, so with 907dave’s help I was able to figure out witch one was the 17* pump.
When comparing the bad pump and the pump I decided to use as a replacement I notice the bad pump had some end play (1st when checking the gear bolt torque before I pulled the pump) I could go in and out with the HPOP shaft about 1/16”, the other pumps had no end play that I could tell. Also the bad pump spun quite easy by hand with the gear on it, the good pump was harder to turn.

The weird thing was after I put it all back together, it would not start and only push about 150 psi on the HPOP gauge. So after playing with the wiring and a few IPRs I had laying around I grounded the yellow/red wire (so the IPR would pull hard) I had a friend crank the engine and the HPOP pressure jumped to 2500psi, . Then I undid the ground and the truck stared right up and ran nice

I wonder if the IPR was jammed up and the 12volt was able to free it up.

I took the truck for a drive around the throttle is very snappy, and it sounds just like my ’95Wake up the neighbors. The HPOP pressure was able to maintain 2600-2800 psi at WOT from 1800-3000 rpm. I noticed the boost would only go to 12 psi and the EGT was lower also. I wont know what I am dealing with until I hook up to my hay trailer tomorrow and head west.

It did idle like a big cammed gasser once it warmed up, and also idles at 900-950 rpm at a stop in drive

I will post my finding after I get home from NY with my load of hay tomorrow.

Thanks again Dave and Bill for the help.

[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.

[907DAVE]

Awesome!

Glad to hear it's up and working for you.

[hayjayhorses]

what should a 17* HPOP max out at (pressure), I am also thinking I may need more then 90cc of fuel.

[907DAVE]

All depends on tuning, and injector type/ size.

But with stock programming all you are going to see is 2800psi.

[hayjayhorses]

thats what it's doing.
If I was to crank it up with tuning, high high can it safely go?

Will bumping the HPOP pressure do much for power or economy?

I want to do all I can to squezz out all mpg i can.

[907DAVE]

Originally Posted by hayjayhorses

thats what it's doing.
If I was to crank it up with tuning, high high can it safely go?

Seems like most tuners are raising it up to 3000-3200. After that you run the risk of floating poppet valves.

Will bumping the HPOP pressure do much for power or economy?

Both actually, increasing ICP also increases MPG's because of the higher atomization and slightly increased timing, same goes for HP's. But there can be a limit as the HPOP's can only support so much.

I want to do all I can to squezz out all mpg i can.

See blue.

Do you have a chip on order?