Updated/fixed...Stock boost psi?
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Fleet Mechanic
Joined: Apr 2019
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From: South AR
Updated/fixed...Stock boost psi?
Hey guys. I’m sure this has been discussed til beaten to death, but I’m on the road now (stopped fueling at moment) and even hauling a few thousand pounds behind going up hills when I floor it I only get to 13 PSI. I have a edge CTS2 monitor. Everything is stock set up, no chip. It will hold at 12 or 13 psi but never gets more. Is there a chance I have a leak or is this just as much as I should expect?
Also what is the best way to check for boot leaks, exhaust leaks etc.? What all should I check?
Also what is the best way to check for boot leaks, exhaust leaks etc.? What all should I check?
Postmaster
Joined: Nov 2015
Posts: 4,807
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From: Colorado Springs
Defueling occurs around 22-23 psi, before I installed the OCR I would see 22-23 on a stock Tune then it would defuel. After the OCR, I would see 25-26 psi with a modified stock turbo. If you’re only seeing 13 psi it’s time to check for leaks.
Senior User
Joined: Oct 2016
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I have the stock turbo based on torque pro and forscan I get 19.3psi wot up an onramp
I would start with torquing all the boot clamps to 60in/lbs except for the manifold boots, I believe those are 50in/lbs. Can also build a boost leak detector for about $8
I would start with torquing all the boot clamps to 60in/lbs except for the manifold boots, I believe those are 50in/lbs. Can also build a boost leak detector for about $8
Got Data?
Joined: Dec 2012
Posts: 4,248
Likes: 1,381
From: Lake Stevens, WA
^^^ what he said. Here is one example of a boost leak detector. Regulate the pressure you apply to 10-20psi:
Some folks apply the cap to the pipe directly connected to the turbo inlet, avoiding leakdown through the CCV.
Some folks apply the cap to the pipe directly connected to the turbo inlet, avoiding leakdown through the CCV.
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
A fully stock truck (when new) reached about 17-18 PSI max. Over the years, that number has spread a bit because of the age of the components under the hood. The engine is capable of significantly more boost if the turbo system is unleashed, but other components interfere with the quest for air soon after.
Step 1: Look up "7-turn" mod and perform that.
Step 2: Search "Red line" mod and do that.
At that point, you might barely reach 22-23 PSI boost if your air in/out has no leaks and the turbo is in working order - but the stock program will defuel at that pressure when you cross 2800 RPM.
Don't forget to look for soot under the hood (which NEVER belongs there), and exhaust leak can take you down just as quick as a boost leak.
Step 1: Look up "7-turn" mod and perform that.
Step 2: Search "Red line" mod and do that.
At that point, you might barely reach 22-23 PSI boost if your air in/out has no leaks and the turbo is in working order - but the stock program will defuel at that pressure when you cross 2800 RPM.
Don't forget to look for soot under the hood (which NEVER belongs there), and exhaust leak can take you down just as quick as a boost leak.
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Fleet Mechanic
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Thread Starter
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Fleet Mechanic
Joined: Apr 2019
Posts: 1,736
Likes: 660
From: South AR
A fully stock truck (when new) reached about 17-18 PSI max. Over the years, that number has spread a bit because of the age of the components under the hood. The engine is capable of significantly more boost if the turbo system is unleashed, but other components interfere with the quest for air soon after.
Step 1: Look up "7-turn" mod and perform that.
Step 2: Search "Red line" mod and do that.
At that point, you might barely reach 22-23 PSI boost if your air in/out has no leaks and the turbo is in working order - but the stock program will defuel at that pressure when you cross 2800 RPM.
Don't forget to look for soot under the hood (which NEVER belongs there), and exhaust leak can take you down just as quick as a boost leak.
Step 1: Look up "7-turn" mod and perform that.
Step 2: Search "Red line" mod and do that.
At that point, you might barely reach 22-23 PSI boost if your air in/out has no leaks and the turbo is in working order - but the stock program will defuel at that pressure when you cross 2800 RPM.
Don't forget to look for soot under the hood (which NEVER belongs there), and exhaust leak can take you down just as quick as a boost leak.
Got Data?
Joined: Dec 2012
Posts: 4,248
Likes: 1,381
From: Lake Stevens, WA
I don't think @Tugly meant soot on the hood itself, but that would sure indicate a helluva leak.
I had forgotten about the 2 mods Tugly mentioned. I think you'll like the results of those, once implemented.
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Fleet Mechanic
Joined: Apr 2019
Posts: 1,736
Likes: 660
From: South AR
Ok..that observation made me smile, Brian.
I don't think @Tugly meant soot on the hood itself, but that would sure indicate a helluva leak.
I had forgotten about the 2 mods Tugly mentioned. I think you'll like the results of those, once implemented.
I don't think @Tugly meant soot on the hood itself, but that would sure indicate a helluva leak.
I had forgotten about the 2 mods Tugly mentioned. I think you'll like the results of those, once implemented.
just made a 1500 mile round trip. Went well, but got REAL lucky. I was going slow speed on some gravel and heard some clicking noises got out and one of my mile marker hubs was almost falling off! 4, yes FOUR, of the screws had come out of one of the hubs and it was about to fall off. Luckily I was able to take two from the other side and screw these back in and we’re good to go for a while. I wish they would’ve included blue Loctite in the instructions. Ugh
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Fleet Mechanic
Joined: Apr 2019
Posts: 1,736
Likes: 660
From: South AR
pardon my ignorance, but how do you fix this?
