IMPREZA BEST BOOST GAUGE LOCATION HOW TO
This will give you some good info on how to do your boost leak test and show you how to properly pressurize your engine. For example if your turbo boosts 14 psi stock, then you don't really want to put more than that while doing the boost leak test.Īlthough the pictures shown will be from a 2004 STI, this same steps apply to all Turbocharged Subaru EJ22/25 Engines including Impreza, Legacy, WRX, Forrester, Outback.īefore getting started be sure to read the " HOW TO BOOST LEAK TEST 101" posted in the categories section. This is a good target boost to use while pressurizing the system with the boost leak tester. You want to have a rough idea of how much you boost while driving. It will cause your turbo to operate at higher speeds that will cause overheating and bearing damage. Keep in mind a boost leak can be anywhere in the boost path, and any leak is bad news for performance and especially your turbo charger. However since we are now boosting the intake pipe which normally does not ever see boost, putting pressure through this line will require blocking off the lines that are attached to the intake pipe, otherwise the pressure you put into the pipe will just escape through these lines to atmosphere, or into the crankcase, and you will not be able to build pressure.Ĭommon leak areas on these motors is the diverter/blow-off valve flange, intercooler connections and the turbo intake pipes have been known to get damaged at the turbo inlet flange. However, since the turbo inlet pipe is easily accessible, we can perform the boost leak test more upstream from the turbo. On the Subaru EJ Engine platform, the turbo inlet is difficult to access causing the traditional way of doing a boost leak test more of a task. Boost Lea k Testing A Subaru at the Intake Pipe