I have a hks gt2 purple wastegate. I bought it brand new. I dyno'd the car today and the car wont go past 26lbs of boost! I was told the screw on top was the adjustment. I have a halman boost controler. Does that screw have to be backed out or in?
Hks gt ii wastegate question
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I dont know what spring is in it! The boost controller is working. I have a precision 71billet and hks manifold that the wastegate come with. I know the problem is with the wastegate and has something to do with that screw adjustment. The instructions are in japanese!
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As trbstng said, screw inward to increase boost.
But whether that works for you or not depends on the spring. I think it would be important to establish what boost pressure you get on just the wastegate spring, no boost controller. From there you can figure a maximum of about twice that much boost using a boost controller...that's a rule of thumb, not cast in stone. So if your spring gives you about 10 to 13 psi, you won't normally get more than about 26 psi with the boost controller.
But whether that works for you or not depends on the spring. I think it would be important to establish what boost pressure you get on just the wastegate spring, no boost controller. From there you can figure a maximum of about twice that much boost using a boost controller...that's a rule of thumb, not cast in stone. So if your spring gives you about 10 to 13 psi, you won't normally get more than about 26 psi with the boost controller.
That makes perfect sense! On wastegate with no boost controller i am getting 18 psi boost so i should be able to get at least 36 psi??? Another question i have is...By turning in that screw will i get more boost also without boost controller hooked up???
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How do you have the wastegate lines run? The hose configuration will have a huge effect on min/max boost. I have a 10ish (don't know exactly) pound spring in my ITS wastegate and I can run 11-12ish PSI with the EBC off and up to 31-32psi with the Ratio turned up to 100%. I have also not observed any real difference in peak boost pressures by adjusting the spring pre-load on my wastegate; rather, I think it has more to do with when the valve begins to crack open.
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Assuming you have the top port vented then? With your current configuration the MBC is bleeding off the pressure that would be acting on the diaphragm to open the valve. If you switch to the top port, then the MBC would be bleeding off pressure that would be acting on the the diaphragm to hold the valve closed. You need to be careful with this config, though, as you will run a LOT more boost, so start slow and make sure you've got more than sufficient octane in case of an overboost.
Another option is to T the pressure source off of the compressor to IN side of boost controller and the bottom/side port, and run the OUT side of your boost controller to the top port -- this is how my EBC solenoid is run.
Another option is to T the pressure source off of the compressor to IN side of boost controller and the bottom/side port, and run the OUT side of your boost controller to the top port -- this is how my EBC solenoid is run.
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