Low boost, need advice
Thread Starter
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Cargo Master
Joined: Sep 2007
Posts: 2,468
Likes: 531
From: Chandler, AZ
Low boost, need advice
I have noticed that the peak boost numbers have fallen over the last year or so.
After installing a superchip tuner (HP mode), 4" exhaust I would see up to 21 psi, and about 16 psi in stock mode. now I get about 14 psi even in HP mode.
I cleaned and inspected all the clamps, no leaks. Puter has no codes. the truck (2000 F250, 60kmiles) is in good condition and has no other problems (clean air filter, fuel filter, oil, ect).
In searchin the forum I found that a wastegate adjustment may be the problem, is this the place to start? What else can I test or adjust that would cause low boost?
Thanks
After installing a superchip tuner (HP mode), 4" exhaust I would see up to 21 psi, and about 16 psi in stock mode. now I get about 14 psi even in HP mode.
I cleaned and inspected all the clamps, no leaks. Puter has no codes. the truck (2000 F250, 60kmiles) is in good condition and has no other problems (clean air filter, fuel filter, oil, ect).
In searchin the forum I found that a wastegate adjustment may be the problem, is this the place to start? What else can I test or adjust that would cause low boost?
Thanks
Senior User
Joined: Sep 2004
Posts: 329
Likes: 0
From: Carroll County, MD
Look for carbon/soot around where the up pipes go into the Y pipe on the back of the turbo. The donut gaskets leak there ALOT.
Powerstrokeshop.com has a kit if you want to just replace what is there with the same, BWD (Black Widow Diesel) has a kit with the new bellowed up pipes that eliminate the donut gasket (a permanent fix, in theory)
Powerstrokeshop.com has a kit if you want to just replace what is there with the same, BWD (Black Widow Diesel) has a kit with the new bellowed up pipes that eliminate the donut gasket (a permanent fix, in theory)
Posting Guru
Joined: Jun 2007
Posts: 1,501
Likes: 2
From: Henderson, NV
Originally Posted by smoky_diesel
I have noticed that the peak boost numbers have fallen over the last year or so.
After installing a superchip tuner (HP mode), 4" exhaust I would see up to 21 psi, and about 16 psi in stock mode. now I get about 14 psi even in HP mode.
I cleaned and inspected all the clamps, no leaks. Puter has no codes. the truck (2000 F250, 60kmiles) is in good condition and has no other problems (clean air filter, fuel filter, oil, ect).
In searchin the forum I found that a wastegate adjustment may be the problem, is this the place to start? What else can I test or adjust that would cause low boost?
Thanks
After installing a superchip tuner (HP mode), 4" exhaust I would see up to 21 psi, and about 16 psi in stock mode. now I get about 14 psi even in HP mode.
I cleaned and inspected all the clamps, no leaks. Puter has no codes. the truck (2000 F250, 60kmiles) is in good condition and has no other problems (clean air filter, fuel filter, oil, ect).
In searchin the forum I found that a wastegate adjustment may be the problem, is this the place to start? What else can I test or adjust that would cause low boost?
Thanks
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Bad bushings (shaft bearings, not the thrust bearing) would cause a whole lot more than just low boost. 
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
This is a picture from an E450 with leaking up-pipes.
After I replaced the leakers with some of the bellowed pipes from International the owner of the van called me up and asked what that whistling sound was.
I told him it was the turbo making boost now!
After I replaced the leakers with some of the bellowed pipes from International the owner of the van called me up and asked what that whistling sound was.
I told him it was the turbo making boost now!
Thread Starter
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Cargo Master
Joined: Sep 2007
Posts: 2,468
Likes: 531
From: Chandler, AZ
Originally Posted by mustang_gt_350
I would check the wastegate.. I beleive the easiest way to check that would be to unplug the red line and go for a run. If that doesnt help it i would check the UP pipes for leaks.
- same boost = problem elsewhere, check up pipe for leaks
- more boost (back to 'normal') = adjust wastegate w/ this procedure;
Steps:
1. Disconnect red line from wastegate actuator. Connect 35psi air source to actuator nipple.
2. With air source connected, remove spring clip from the end of the pin one the wastegate arm holding the actuator linkage in. Once spring clip is removed, slide actuator linkage off of pin on wastegate arm.
3. Adjust the actuator linkage such that when the 35psi air source is connected to the actuator and the wastegate is shut, the actuator linkage slides down on top of the wastegate pin with little effort or does not push the wastegate open.
4. Reconnect actuator linkage to the wastegate arm and reinstall spring clip (preferably a new one). Reconnect red line to actuator.
Looks from this that applying positive pressure (or atmopheric) to the wastegate actuator will shut the valve. Is the valve operated with controlled vacuum via the 'puter?
Thanks for the inputs
Posting Guru
Joined: Aug 2007
Posts: 1,852
Likes: 1
From: Sonoita Hills, AZ
If the test reveals that waste gate needs adjustment, that means spring is getting weak and a new wastegate might be in order. You also didn't mention if you have exaust upgrades, which tends to make wastegate go a little quicker. A new wastegate would get your also increase your boost, my new wastegate can be adjusted all the way to 30lbs., it is currently at 25lbs. Which is a little safe for turbo.