I am currently using a TurboXs dual stage controller, and love it. The 1st stage is completely stock (adjustment screw completely clockwise) Even though it yields no boost gain, the spool up of the turbo is quicker. I did not go to stage 2 until I installed an EGT gauge to compliment a boost controller. I also waited until i installed a HKS SSBOV (sequential blow off valve) It did not take much of a boost gain to see that the surge valve which BTW vents back into the intake, could not handle the pressure. I have defeated the Surge valve and the boost is much more steady and less spikey. If you are going to boost turbo pressure signifigantly a Boost gage is a MUST, and either a EGT gauge, or an A/F mixture are a must as well. This way you can tell where you are in boost adjustment, and if at any time you lean out the fuel mixture too much, before any damage can happen. From all that I have read and seen posted here on this forum, the engine can run without damage and with enough fuel in the mixture up to about 15 PSI. So I make sure that I do not boost past 14 (except for the occasional spike to 15). The problem is that you cannot just raise boost and ignore any kind of engine monitoring/management. I have installed a 2.5" dual exhaust system with a turbo flow glasspack that is tuned (by physical size and vent rotation inside the glasspack) for Supercharged/Turbocharged engines. I have installed a low restriction intake setup (currently Air Raid) to insure that I am getting all of the air that I can thru the intercooler. The first rule of boost increase is monitor & Control the second rule is to insure that the intake and exhaust are sufficiently open so that the pressure has a place to go. As far as the MBCs go, they all work pretty well. I did have 1 hallman pro with the ceramic ball that I had issues with. However that being said, the Hallman pro with the stainless ball & stock pressure spring worked well. The only reason that I changed was to go to the dual stage TurboXs. This way when my wife drives the car I don't worry about the extra performance that the 14 PSI adds to the PT. It is also handy to be able to drive stock when I need or want to (mostly for fuel economy). Sorry that this is so long winded, but I hate to see anyone go into boost increase without being armed with what to watch for and how to watch for it. Good Luck, and Happy Boosting
Alan (Black GT w/Purple flames)
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