ICP Pressures
Posting Guru
Joined: Nov 2007
Posts: 2,158
Likes: 0
From: West Texas
anyones guess if your chip is on. In stock mode mine usually idles about 640. down to 580 or so sometimes. Running down the road empty usually 700 to 1500 and I don't think I've seen it go over 4000.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
There are no certain specs are various RPMs. If you have a chip, each tuner tunes the ICP differently. At idle you need about 600psi or close to it. At WOT, you want to be close to 3000psi. What's your ICP doing? Are you having problems with ICP??
Posting Guru
Joined: Nov 2007
Posts: 2,158
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From: West Texas
That's why I said that about the chip. These tuners fudge that number and youre seeing the fudged number if the chip is on and it's an electronic gauge. I've seen it get close to 4000 in tow mode.
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Senior User
Joined: Jul 2006
Posts: 320
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From: Wisconsin
Recently I got a new scanner and have been playing around with it. I've always heard something about 3000psi ICP so for some reason I was under the impression that it was a constant 3000 while the engine is running, kinda like where you maintain a fuel system at 60-70psi constant. But I guess the 3000psi is only under WOT, so my graph don't look so bad then! I was just expecting to see a flat line around 3000, so when I saw 600-700 at idle it just got me wondering. I have my tuning from Bill at PHP and he said he likes to tune to 3000psi, not much more because it doesn't do much for power and it just wears out the parts faster.
My other reason for checking it out was because sometimes it takes a significant amount of cranking to fire and I was just looking into the possibility if the 15* pump was having problems building pressure to fire the 238s!
My other reason for checking it out was because sometimes it takes a significant amount of cranking to fire and I was just looking into the possibility if the 15* pump was having problems building pressure to fire the 238s!
VT Chapter Ldr
Joined: Apr 2004
Posts: 96,096
Likes: 294
From: Orange, Vermont
Pressure fluctuates a lot. I have a round glicerin filled gage mounted to the windshield cowling on my truck and the pressure is dependent on throttle position and load. 60 mph crusing in can be at 1200 or if pulling a hill it could go up to 2700. My truck is stock for tuning and injectors, I do have an Adrenaline HPOP, but I don't think I have quite hit 3000psi. The Adrenaline didn't affect my pressure any, my old stock 15* 200000+mile HPOP appearently was still in decent shape, but I felt the deal was good for the adrenaline and a good time to change it.
Elder User
Joined: Oct 2004
Posts: 782
Likes: 1
From: Olympia, WA
ICP fluctuates with load. Maybe 700psi at idle or coasting, up to 3000psi or so at full load. Soon as you let up on the pedal, ICP drops.
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Butt-Head
Joined: Apr 2004
Posts: 9,415
Likes: 2,910
From: Reed Point, MT
Injection pressure is based on RPM and MFD (mass fuel desired).
OBS truck programming calls for 580 at idle and 2465 under max power rating.
OBS truck programming calls for 580 at idle and 2465 under max power rating.
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Recently I got a new scanner and have been playing around with it. I've always heard something about 3000psi ICP so for some reason I was under the impression that it was a constant 3000 while the engine is running, kinda like where you maintain a fuel system at 60-70psi constant. But I guess the 3000psi is only under WOT, so my graph don't look so bad then! I was just expecting to see a flat line around 3000, so when I saw 600-700 at idle it just got me wondering. I have my tuning from Bill at PHP and he said he likes to tune to 3000psi, not much more because it doesn't do much for power and it just wears out the parts faster.
My other reason for checking it out was because sometimes it takes a significant amount of cranking to fire and I was just looking into the possibility if the 15* pump was having problems building pressure to fire the 238s!
My other reason for checking it out was because sometimes it takes a significant amount of cranking to fire and I was just looking into the possibility if the 15* pump was having problems building pressure to fire the 238s!
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Milwaukee1979F150
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