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how to make a boost leak tester!


920vr4
Unregistered


Galant VR-4 org Post #: 333929 posted 05/01/06 05:45 PM     Remind Me!  Send Private Message   Edit Post      
i looked on the vfaq but i was wondering if anybody has used something better and what do i need to make it thankyou

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s_firestone
Ctrl-Alt-Boost
918/1000


Galant VR-4 org Post #: 333951 posted 05/01/06 06:17 PM     Remind Me!  Send Private Message   Edit Post      
Assuming a 14b turbo, a 2" hardware store rubber coupler(with worm clamps), and a 2" PVC cap, a 16G has a tad larger opening, but small enough to squeeze a 2" coupler. Either buy a cap with a 3/8" threaded hole and put a quick connect NPT air fitting(threads are compatible) or just a tire cap fitting by pre-drilling a hole. Essentially you just want to put a cap over the turbo inlet and seal it. Then using compressed air, pressurize no more than 20 to 25 psi(no more than slightly higher than you would under boost) and check for escaping air. I recommend you rotate your engine to TDC to close your valves.

You will likely hear either a little bit or a lot of air escaping. Track down the source or sources by sound, feel, or soap bubbles. Take one leak at a time from easiest or largest. Come research whenever you think you found one that might require a complex part to be disassembled. Some leaks are easy to fix, some are not worth the effort if they are small leaks. Some air will escape. A turbo is not perfectly sealed. You want to get the most obvious. Keep the leaks far under the ability of the air to compress while in boost. The ECU will be able to perform better because the volume of metered air in the system remains the same. If your engine is erratic or lacking in power that is one of the first things you should check.



Stephen Firestone
1992 GVR4 #918 of 1K

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SteveHebert
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Galant VR-4 org Post #: 334067 posted 05/02/06 04:18 AM     Remind Me!  Send Private Message   Edit Post      
Related question-
If on any cylinder an intake and exhaust valve are both even slightly open wouldn't air escape thru there?

If so can you set your crank to a point where you know they are all closed?

Does it matter?

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silverex
Unregistered


Galant VR-4 org Post #: 334068 posted 05/02/06 04:55 AM     Remind Me!  Send Private Message   Edit Post      
you have to change a couple of things but at least it has pics
http://forums.nasioc.com/forums/showthread.php?t=879900&highlight=DIY

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920vr4
Unregistered


Galant VR-4 org Post #: 334105 posted 05/02/06 08:36 AM     Remind Me!  Send Private Message   Edit Post      
what does tdc stand for ?

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Polish
Dr. Pilosh Haagenscodyberger


Galant VR-4 org Post #: 334118 posted 05/02/06 09:00 AM     Remind Me!  Send Private Message   Edit Post      
Top Dead Center.



My car site
Old GVR4 #1186/2000

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920vr4
Unregistered


Galant VR-4 org Post #: 334173 posted 05/02/06 11:50 AM     Remind Me!  Send Private Message   Edit Post      
how can you do that

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jepherz Galant VR4.org Moderator
Too Clean
1881/2000
50/1000


Galant VR-4 org Post #: 334206 posted 05/02/06 01:39 PM     Remind Me!  Send Private Message   Edit Post      
Rotate the crank pulley until the white cam marks line up parallel with the top of the head. Look up timing belt changing on VFAQ and it should show a pic.



-Jeff
1881/2000
50/1000

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sleepyvr4
I Hate Kitty Cats


Galant VR-4 org Post #: 335080 posted 05/04/06 02:40 PM     Remind Me!  Send Private Message   Edit Post      
wow.

anyways - go here for a leak tester please:

click here and you will be saved from yourself...

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Fitch
Unregistered


Galant VR-4 org Post #: 335081 posted 05/04/06 02:49 PM     Remind Me!  Send Private Message   Edit Post      
Sweet jeezus! 21 freakin' dollars? That's quite the tidy profit! I'll stick to Home Depot Racing and avoid MockV.

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sleepyvr4
I Hate Kitty Cats


Galant VR-4 org Post #: 335111 posted 05/04/06 03:35 PM     Remind Me!  Send Private Message   Edit Post   
time or $ ? And how much do you actually save? I made mine for $5, but I have the creativity of the ages. I also have a friend make one out of a coffee cup (not a typo) and we use it frequently.

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