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Old 08-14-2014, 07:06 AM   #1
mbuster
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Default Can 2 BOV's cause a boost leak on a single turbo set up?

Hi everyone I just bought my first supra a few weeks ago. It is a 1995 mk4 targa top. When I bought the car it already had a Garrett 67mm turbo and an HKS intercooler. Long story short I took it to my buddies shop to get it tuned and we discovered that after 9lbs or so of boost it would leak boost. We checked out the piping and it was all good to go but noticed while inspecting the turbo piping that the car has 2 blow off valves. Could this be the reason I am leaking boost? I went from a civic to a supra so any help would be appreciated.
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Old 08-19-2014, 06:03 AM   #2
pwpanas
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Originally Posted by mbuster View Post
Hi everyone I just bought my first supra a few weeks ago. It is a 1995 mk4 targa top. When I bought the car it already had a Garrett 67mm turbo and an HKS intercooler. Long story short I took it to my buddies shop to get it tuned and we discovered that after 9lbs or so of boost it would leak boost. We checked out the piping and it was all good to go but noticed while inspecting the turbo piping that the car has 2 blow off valves. Could this be the reason I am leaking boost? I went from a civic to a supra so any help would be appreciated.
It is unlikely that the BOVs are the source of the boost leak but it is possible. You need to pressurize your intake system. This is done with an air compressor, and typically a jury-rigged adapter - usually with hose clamps, plumbing supplies, and an air valve. Your intake system should hold 25psi at least ... if not, you'll hear where it is leaking. The pros use a smoke machine, and pressurize the intake system with smoky air so you can hear and see the leak(s).

Please let me know if you have any questions.
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NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.
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Old 10-03-2014, 03:35 PM   #3
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HI i have seen a bov leak more then once but usely cheap ones
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Old 10-03-2014, 05:07 PM   #4
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HI i have seen a bov leak more then once but usely cheap ones
Unfortunately, the OEM BOV often leaks after 50k+ miles of exposure to the heat of a turbocharged engine bay. This is one of the few areas it seems the Toyota accountants beat the TRD engineers in selecting components for the Mkiv Supra Turbo.
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Displacement is no replacement for boost.
Life begins at 30psi.


NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.

Last edited by pwpanas; 10-03-2014 at 05:13 PM.
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