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post #1 of 11 Old 07-30-2012, 06:17 PM Thread Starter
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Boost leak?

I am thinking that I have a boost leak. I typically am driving on the DP 80hp tune and have the mods in my signature. The BD Turbo is a stock replacement, or so I was told. When driving around with my foot on the gas cruising I am sitting at 1-3psi of boost at 1700 rpm. When I am on it at 2500rpm+ I don't see more than 10psi boost until I hit overdrive, then I haven't seen it about 20psi, and I was over 100mph at that point. I have been searching the forums and it sounds like I am low on boost, what do you guys think. I also keep reading about a "boost leak test" but I haven't been able to find a forum on how to do the leak test. Can someone point me in the right direction or tell me how to do a leak test? Also, what else should I be looking at/for?

1999 F250 XLT 4X4


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post #2 of 11 Old 07-31-2012, 05:19 AM
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Could be. what did you used to boost? What does the tune call for? To me that sounds low.. super duty's are more like 25-26psi I though.
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post #3 of 11 Old 07-31-2012, 03:39 PM
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Try a WOT run and see how high you get. You should get to about 26psi on a tune with a stock turbo.

As far as the leak tester it's pretty easy. Just get a 4" pipe cap, an air hose fitting, and a pressure gauge. Drill into the top of the cap and screw in the pressure gauge. Most will tap themselves and it doesnt have to be a commercial grade job. Just use the threads on the gauge to tap it. Same thing with the hose fitting. Put the cap in the intake boot and clamp her down. You dont need to pressurize it to 26psi, 10psi will do. For this you will need a regulator on the compressor or in line. Keep the flow on as you will probably lose pressure just naturally through the tail pipe.

Now just go around with a spray bottle with soapy water and look for bubbles.

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post #4 of 11 Old 07-31-2012, 04:14 PM
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i disagree on not tesing to 25psi... you typically test 5-10psi over your max-boost, to account for overboost and spikes. If your turbo is spooling up to 25psi and a charge pipe pops off sending it to 30, even 40psi, kiss that shaft goodbye.


Also, you should be able to build boost up to 'x' psi, turn the compressor off, and not lose any boost. You should be able to detect boost leaks by boost dropping and it hissing out of the leak.
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post #5 of 11 Old 07-31-2012, 07:40 PM
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Quote:
Originally Posted by 85_305 View Post
i disagree on not tesing to 25psi... you typically test 5-10psi over your max-boost, to account for overboost and spikes. If your turbo is spooling up to 25psi and a charge pipe pops off sending it to 30, even 40psi, kiss that shaft goodbye.
Um, no.

A leak will be present at ANY boost level, not just over boost. If you want to test how much pressure the system can hold then you want to do as you said. But thats not what the OP wants to test. The OP wants to see if the system can hold pressure, not how much. Even at 1 psi the air will leak if he has a leak, there just wont be much air to help find the leak. 10 psi is a safe level where if the tester slips out it will wont have much momentum. At 30 psi its more like a ballistic object.

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post #6 of 11 Old 08-01-2012, 05:14 AM
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Quote:
Originally Posted by AOx4 View Post
Um, no.

A leak will be present at ANY boost level, not just over boost. If you want to test how much pressure the system can hold then you want to do as you said. But thats not what the OP wants to test. The OP wants to see if the system can hold pressure, not how much. Even at 1 psi the air will leak if he has a leak, there just wont be much air to help find the leak. 10 psi is a safe level where if the tester slips out it will wont have much momentum. At 30 psi its more like a ballistic object.
If your gonna be an *******, at least be a correct *******. Because your wrong.

1psi of boost is nothing... thats like sticking your mouth to the IC piping and blowing into it. If you pulled your IC piping and blew into it, do you really think your body would have enough pressure to pressurize the system?

I'll help you out. No, your body wont even phase the gargantuan IC setup.

You need to pressurize to the PSI that truck typically runs at. 32psi is going to have a lot more force behind it than say, 1psi or 10psi. Thats a huge difference in pressure. When your turbo is pushing max boost and your driving down the road, the IC lines are moving, radiator/ic moving, the motor is torqueing etc... which can create boost leaks. You have to do everything you can do to simulate driving down the road to find the stubborn boost leaks.

For instance. My TDI I boost about 30psi. If I juice the IC up to 30psi w/ my leak down setup, nothing will leak. Now, simulating driving down the road, shaking the IC lines and the IC, all of a sudden I have a boost leak popping up that ONLY shows when the motor is tweaking and allowing the boost leak to show.

When you test at pressures this high, put a very heavy rag/towel over the boost fitting incase it pops off.

And lastly, if your IC is sealed off as well as it should be, there should be very little to no boost leaking out w/ the compressor shut off. The gauge should barely move on the decrease when sitting idle.
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post #7 of 11 Old 08-01-2012, 12:48 PM
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The early 99's have a smaller turbo than later 99-03 7.3L's. They dont run much more than 16-18psi from the factory.
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post #8 of 11 Old 08-01-2012, 01:01 PM
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assuming he's on stock tuning, and not boosting anymore than that, I'd still add 4psi on... so I'd test to 20psi.
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post #9 of 11 Old 08-01-2012, 07:06 PM Thread Starter
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Thanks for all the info and opinion. Ill be doing a leak test this weekend and cleaning all my IC fittings. Considering doing a CCV mod too, depending on how much oil I find.

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post #10 of 11 Old 08-03-2012, 11:41 AM
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you could have a leak in your up pipes. I had lower bost then I was suppose to and went looking and found a hole in the up-pipes.

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