HPOP performance question
Thread Starter
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Freshman User
Joined: Oct 2011
Posts: 45
Likes: 0
From: McMinnville, Tennessee
HPOP performance question
Just wondering how much of an improvement an upgraded HPOP would be over my stock one now. It will only hold about 1800 psi at 90%+ ipr duty cycle now. I do have stock injectors (which I know are oil hungry 
), but the truck runs good and starts good and seems to have decent power. Am I missing something? Everywhere I read says that the HPOP is weak and I should be down on power..
), but the truck runs good and starts good and seems to have decent power. Am I missing something? Everywhere I read says that the HPOP is weak and I should be down on power..
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
Could be just the IPR. That's not much pressure. And I believe anything over 60% is not good. Someone will pop in to verify this. I think the T500 is the best deal for the price if your going to change one out. But there is others out there. You could try unplugging the ICP is see if it changes, if not install a new IPR it that don't work install the new IPR in your new HPOP. You don't have smoke in the exhaust do you? Some times injector O-rings can cause low HPO also.
More Turbo
Joined: Oct 2009
Posts: 655
Likes: 18
From: Randolph County NC
In my case changing out the HPOP made a huge difference performance wise. My truck ran fine on the old HPOP but would throw the CEL when I got on it. Like you my ICP would drop to 1800 and duty cycle was >70%.
After adding the Adrenaline HPOP, ICP stays above 2800 and duty cycle is 40%. Replacing the HPOP is one of the biggest performance improvements I have made to my truck.
After adding the Adrenaline HPOP, ICP stays above 2800 and duty cycle is 40%. Replacing the HPOP is one of the biggest performance improvements I have made to my truck.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
A tuned truck can and does allow the IPR to go up to 100%. What are you using to get your IPR reading? Can you read your Fuel Injector Pulse Width? I'd put money on the table that your FIPW is sneaking up on 4.5 ms (or higher). If you can graph the ICP, you will see a huge spike well above 3000 PSI when you let off the throttle. Try the same test in stock calibration.
There are too many things that can cause your issue. I had an ICP of 1800 PSI at WOT on a tune, and adding the T500 got me up to 2400 PSI. While that was an impressive jump - the target ICP was 3000... I still came up short. I changed so much hardware that my Buck$Zooka melted, yet I could never get over that 2400 PSI... until I changed one key item.
I now get 3000 PSI with an IPR of 40%.
There are too many things that can cause your issue. I had an ICP of 1800 PSI at WOT on a tune, and adding the T500 got me up to 2400 PSI. While that was an impressive jump - the target ICP was 3000... I still came up short. I changed so much hardware that my Buck$Zooka melted, yet I could never get over that 2400 PSI... until I changed one key item.
I now get 3000 PSI with an IPR of 40%.
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
With my stock HPOP (15°) My duty cycle would max out at 65% in my 100hp tune (BTS tunes) and I could barely get 1500 psi to the Stock injectors'
After I installed a Terminator T500 I'm seeing 2700 PSI at 40-42% duty cycle.
Same 100hp tune.
I now have single shot injectors, but I haven't done any data logging since the install.
Huge improvement on paper & SOTP (seat of the pants)
After I installed a Terminator T500 I'm seeing 2700 PSI at 40-42% duty cycle.
Same 100hp tune.
I now have single shot injectors, but I haven't done any data logging since the install.
Huge improvement on paper & SOTP (seat of the pants)
Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
It's not the kind of power that goes away over night. It slowly fades and takes someone who really is honed in on their truck. My truck does the same exact thing as yours. People who ride in my truck think it's quick for what it is.... I on the other hand with it being my truck knew something wasn't right and told my wife I thought it was down on power. With tugly and the guys help here I've narrowed it down and as soon as funds come in I will be going through the same process that tugly did.
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Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Just remember folks, the HPOP is a fixed displacement pump. It will always push a certain amount of oil per pump revolution. When demand from the injectors exceeds that of what the pump can supply, pressure will fall. Doesn't necessarily mean it's a bad pump, it's just working as it was originally intended. Throw a tune on it and you'll quickly find the limitations.
Now will a modified pump designed to supply a greater volume of oil help? Of course. Is it absolutely needed? Well that is up to you. Some of that can be corrected with tuning by dialing back the injection pulse width. In rare cases there are weak pumps out there. It happens. But you'll see performance issues in stock tuning if that's the case.
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Thread Starter
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Freshman User
Joined: Oct 2011
Posts: 45
Likes: 0
From: McMinnville, Tennessee
I used my Edge Insight to monitor ICP and IPR %. I'll have to check and see if it monitors pulsewidth as well. I do set p1211 in any tune above stock. From what I gather, I need to have my tunes revised along with a modded Hpop. Am I right?
Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
Try pulling the tuner and see what you end up with then. Don't pit it to "stock" setting because a tuned stock setting and a tuners stock setting may be different. With my tuner in and on 80economy my icp pressure will go up to 2700-2800 psi at half throttle but the second I floor it icp drops to 1800
I pulled the tuner awhile back and did another run, foot to the floor my icp pressure was at 2900
Do that too and well see whats going on. I don't recall what my duty cycle was at but I k now it was way up there.
That was a little test Tugly told me to do... Thanks again Rich.
I pulled the tuner awhile back and did another run, foot to the floor my icp pressure was at 2900
Do that too and well see whats going on. I don't recall what my duty cycle was at but I k now it was way up there.
That was a little test Tugly told me to do... Thanks again Rich.
As Adam would say in a gravelly voice on "Mythbusters"... well there's your problem.
Trailering
Joined: Dec 2022
Posts: 22
Likes: 4
A tuned truck can and does allow the IPR to go up to 100%. What are you using to get your IPR reading? Can you read your Fuel Injector Pulse Width? I'd put money on the table that your FIPW is sneaking up on 4.5 ms (or higher). If you can graph the ICP, you will see a huge spike well above 3000 PSI when you let off the throttle. Try the same test in stock calibration.
There are too many things that can cause your issue. I had an ICP of 1800 PSI at WOT on a tune, and adding the T500 got me up to 2400 PSI. While that was an impressive jump - the target ICP was 3000... I still came up short. I changed so much hardware that my Buck$Zooka melted, yet I could never get over that 2400 PSI... until I changed one key item.
I now get 3000 PSI with an IPR of 40%.
There are too many things that can cause your issue. I had an ICP of 1800 PSI at WOT on a tune, and adding the T500 got me up to 2400 PSI. While that was an impressive jump - the target ICP was 3000... I still came up short. I changed so much hardware that my Buck$Zooka melted, yet I could never get over that 2400 PSI... until I changed one key item.
I now get 3000 PSI with an IPR of 40%.
