pressurization of the nissan 300zx twin turbo intake system. intake system holds pressure while closed, and releases pressure when the nozzle is removed.
+Neal Singh The intake filter is replaced with a boost leak test cap (buy from a vendor or fabricate from pluming cap). This cap contains a fitting for pumping air into the system. The cap should also have a pressure gauge, to verify the pressure within the intake tract, to check against over-pressurizing the system. Otherwise, the pressure within the intake tract may be verified using a boost gauge in the interior, or similar means. Air is pumped into intake tract through the boost leak test cap until the desired psi is reached. Since the system usually contains preturbo piping, which always sees vacuum, avoid pressurizing the system more than several psi to avoid damaging the suction side of the intake (again, which only sees vacuum). Keep in mind, some boost leaks will not make themselves evident at lower pressures (no indications at 2 psi, but noticeable at 6 psi). Once the intake system is pressurized to the desired pressure, turnoff the air compressor (and any other noise for that matter), and listen for leaking air. Note, that other leaks may become evident after other leaks are fixed. To help identify the location of leaks, one can spray soapy water in the vicinity of suspected leak. One might find punctures, tears, or holes in hoses or pipes, clamps that need tightening, etc. After fixing the leaks, repressurize the system and recheck for new leaks (or if the last fix didn't quite work). Eventually, once all leaks have been fixed, the intake tract should be able to remain pressurized for a long period of time without losing too much pressure (leakage past piston rings, etc.), similar to a leakdown test. So, step 1: install boost leak test cap in place of air filter. step 2: pressurize the system to a desired pressure. step 3: quiet external noises and listen for leaks. step 4: locate and fix leaks. step 5: repeat until system holds pressure (again, similar to leakdown test). Hope this helps.
z1 motorsports sells the testers
Will a 5 gallon air compressor be large enough to do the test?
where did you get the intake plug w/ gauge that you are using in the video? That is exactly what I need to do!
could you explain how this test works ?
+Neal Singh The intake filter is replaced with a boost leak test cap (buy from a vendor or fabricate from pluming cap). This cap contains a fitting for pumping air into the system. The cap should also have a pressure gauge, to verify the pressure within the intake tract, to check against over-pressurizing the system. Otherwise, the pressure within the intake tract may be verified using a boost gauge in the interior, or similar means. Air is pumped into intake tract through the boost leak test cap until the desired psi is reached. Since the system usually contains preturbo piping, which always sees vacuum, avoid pressurizing the system more than several psi to avoid damaging the suction side of the intake (again, which only sees vacuum). Keep in mind, some boost leaks will not make themselves evident at lower pressures (no indications at 2 psi, but noticeable at 6 psi). Once the intake system is pressurized to the desired pressure, turnoff the air compressor (and any other noise for that matter), and listen for leaking air. Note, that other leaks may become evident after other leaks are fixed. To help identify the location of leaks, one can spray soapy water in the vicinity of suspected leak. One might find punctures, tears, or holes in hoses or pipes, clamps that need tightening, etc. After fixing the leaks, repressurize the system and recheck for new leaks (or if the last fix didn't quite work). Eventually, once all leaks have been fixed, the intake tract should be able to remain pressurized for a long period of time without losing too much pressure (leakage past piston rings, etc.), similar to a leakdown test.
So, step 1: install boost leak test cap in place of air filter. step 2: pressurize the system to a desired pressure. step 3: quiet external noises and listen for leaks. step 4: locate and fix leaks. step 5: repeat until system holds pressure (again, similar to leakdown test).
Hope this helps.