Let's talk HPOPs, and big oil, a fireside chat
#1
12-04-2007, 08:25 PM
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Let's talk HPOPs, and big oil, a fireside chat
Hello everyone, this evening's miscellaneous rambling wil be about the oil systems in the 7.3. We all know that oil fires the injectors. We all know that more oil under more pressure makes more HP potential with even stock injectors. Get better injectors and well, more fuel blah blah, Injectors are for another evening. 
Soooo, where was I? Oh yeah, HPOP.
What do you know about yours? Really? I will not bore you with how they work or don't work because I do not know the internal workings of one, having never disassembled one. Since I did not know, I thought I might have a look at how my stocker is fairing since I have an AE and that costs way too much money to just sit there. Now I needed a measuring stick. I could have gone to the shop manual but I stumbled across the below information from SWAMPS very informative site. I trust that they have more experience tuning these rigs than the engineers who brought us the through the fanbelt upper radiator hose, among other clever designs. Here is an exerpt:
Armed with this information, I set out to see what was going on with mine. I sure didn't want to be below 2400psi. And the results are........going to be posted in the next post here momentarily. I know, hang on to your seats boys and girls. 
Soooo, where was I? Oh yeah, HPOP.
What do you know about yours? Really? I will not bore you with how they work or don't work because I do not know the internal workings of one, having never disassembled one. Since I did not know, I thought I might have a look at how my stocker is fairing since I have an AE and that costs way too much money to just sit there. Now I needed a measuring stick. I could have gone to the shop manual but I stumbled across the below information from SWAMPS very informative site. I trust that they have more experience tuning these rigs than the engineers who brought us the through the fanbelt upper radiator hose, among other clever designs. Here is an exerpt:
Put your chip in its' highest setting, and go out on the interstate (while having someone watch the ICP value on the datastream) and start at about 60mph...
FLOOR the pedal, and stay in it, 100% from ~60-90mph...what you're likely to see (on the scantool) is that the ICP will spike up rather quickly, to 2800-3000psi or so, and then the longer you stay in the pedal...the ICP will slowly drop and drop and drop...the ICP will eventually stabilize (stop dropping).
WHERE the ICP levels off can be some indication as to the condition of your HPOP.
If your truck can maintain 2800+psi then you are one of the FEW folks that have a terrific HPOP.
I would estimate that 90% of the Power Strokes can only maintain ~2200(+/- 200)psi of HPOP pressure, or ICP...5% are above 2600, the other 5% are below 1900psi...
depending on how low (or high) of ICP you are able to maintain will greatly affect which model of injector I would recommend. .......
....... If you can maintain 2800+ psi of ICP, then any injector 250cc's and under will perform exceptionally well.
If you can maintain 2400psi then that's not bad, not great either.
2200psi is mediocre, and full performance from any injector will not be achieved with that HPOP, though power WILL go up with nearly any injector, driveability (excessive smoke) might be an issue.
If you cannot maintain 1900psi, you might seriously consider an aftermarket dual HPOP system, or our Gen3 HPOP. Nearly any larger injector is going to make the truck feel sluggish, and smoke excessively.
FLOOR the pedal, and stay in it, 100% from ~60-90mph...what you're likely to see (on the scantool) is that the ICP will spike up rather quickly, to 2800-3000psi or so, and then the longer you stay in the pedal...the ICP will slowly drop and drop and drop...the ICP will eventually stabilize (stop dropping).
WHERE the ICP levels off can be some indication as to the condition of your HPOP.
If your truck can maintain 2800+psi then you are one of the FEW folks that have a terrific HPOP.
I would estimate that 90% of the Power Strokes can only maintain ~2200(+/- 200)psi of HPOP pressure, or ICP...5% are above 2600, the other 5% are below 1900psi...
depending on how low (or high) of ICP you are able to maintain will greatly affect which model of injector I would recommend. .......
....... If you can maintain 2800+ psi of ICP, then any injector 250cc's and under will perform exceptionally well.
If you can maintain 2400psi then that's not bad, not great either.
2200psi is mediocre, and full performance from any injector will not be achieved with that HPOP, though power WILL go up with nearly any injector, driveability (excessive smoke) might be an issue.
If you cannot maintain 1900psi, you might seriously consider an aftermarket dual HPOP system, or our Gen3 HPOP. Nearly any larger injector is going to make the truck feel sluggish, and smoke excessively.
#3
12-04-2007, 08:32 PM
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#6
12-04-2007, 08:45 PM
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and here is the graph. I started the data log on the on ramp. I will point out that the first trough was because the truck downshifted as I was merging onto the interstate and I wanted it to shift into OD. I got in there and looked for an opening and floored it again without a downshift. At about 95 I was a lawbreaker and stuff was coming up quickly so I backed out. Have a look.
#7
12-04-2007, 08:45 PM
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12-04-2007, 08:51 PM
#11
12-04-2007, 09:05 PM
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Now it is time to talk about the numbers. What do they mean? Well, I am not sure because I forgot that my chip was in the stock tune when I logged the earlier Romp graph, and I usually warm the truck up when it is cool. So what you are looking at is my DP stock tune HPO numbers. Dang it. I needed to put it in the 120 race. I bet the numbers would be better with the tune. Sounds like I need to go back out there tomorrow.
So, back to the topic. Those estimated stock HPOP #s from swamps are disturbing. Now for the musings. How do dual HPOPs make more than 3000 PSI without modifying the pumps themselves? Do you need more than 3k psi to run injectors? Is not 2x the volume of one HPOP, both systems running 2500 all you really need? What parts of the HPOP wear out resulting in a weak one and what constitutes a good one? Or do they start out that way?
Let's look at the Stealth. You can use your own pump along with a new one and install the DIY kit. Is there a gear multiplication or are we just doubling volume? Although injectors are for another day, what is a good safe pressure for those without beating the crap out of them leading to a premature demise? Perhaps we are better off with a good volume at a healthy pressure.
So the door is open, I will post my 120race results when I get them, and my fire is going. Have at it.
So, back to the topic. Those estimated stock HPOP #s from swamps are disturbing. Now for the musings. How do dual HPOPs make more than 3000 PSI without modifying the pumps themselves? Do you need more than 3k psi to run injectors? Is not 2x the volume of one HPOP, both systems running 2500 all you really need? What parts of the HPOP wear out resulting in a weak one and what constitutes a good one? Or do they start out that way?
Let's look at the Stealth. You can use your own pump along with a new one and install the DIY kit. Is there a gear multiplication or are we just doubling volume? Although injectors are for another day, what is a good safe pressure for those without beating the crap out of them leading to a premature demise? Perhaps we are better off with a good volume at a healthy pressure.
So the door is open, I will post my 120race results when I get them, and my fire is going. Have at it.
#12
12-04-2007, 09:13 PM
Now it is time to talk about the numbers. What do they mean? Well, I am not sure because I forgot that my chip was in the stock tune when I logged the earlier Romp graph, and I usually warm the truck up when it is cool. So what you are looking at is my DP stock tune HPO numbers. Dang it. I needed to put it in the 120 race. I bet the numbers would be better with the tune. Sounds like I need to go back out there tomorrow.
How do dual HPOPs make more than 3000 PSI without modifying the pumps themselves? Do you need more than 3k psi to run injectors? Is not 2x the volume of one HPOP, both systems running 2500 all you really need? What parts of the HPOP wear out resulting in a weak one and what constitutes a good one? Or do they start out that way?
Let's look at the Stealth. You can use your own pump along with a new one and install the DIY kit. Is there a gear multiplication or are we just doubling volume? Although injectors are for another day, what is a good safe pressure for those without beating the crap out of them leading to a premature demise? Perhaps we are better off with a good volume at a healthy pressure.
#13
12-04-2007, 09:20 PM
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Originally Posted by Izzy351
So is your truck holding 2500 or 2750? Not sure which part of the curve is which.
#14
12-04-2007, 09:25 PM
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#15
12-04-2007, 09:26 PM
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Originally Posted by Pocket
Actually, with a hotter tune those numbers will drop significantly. Several stock trucks I've data logged held higher PSI than what your graph shows. Doesn't look too good for you.