These mechanical issues can not be solved with tuning alone. The most common cause for a vehicle overboosting, especially any 08+ WRX/STI, is a catless downpipe. The same goes for mechanical problems causing overboost and the LWG map. The most common mechanical issues that may prevent reaching target boost are boost leaks due to a loose coupler, an aged turbo, a clogged downpipe, a failing wastegate, or a torn vacuum hose. For instance, if there are mechanical issues present causing underboost, the HWG map will not be of any benefit. There are certain situations where these maps are not the solution to the boost targeting issues you may be experiencing. These can be found by clicking the “notes available” link on any map or found in the support section of the COBB website. Some vehicles have an acceptable variance of 1.5 PSI so be sure to check the map notes for more details. Overboosting is more likely to occur in higher gears and with colder outside temperatures so verify boost levels during these conditions if you commonly experience them. This figure is only relevant in determining over/underboosting issues at Wide Open Throttle through peak boost. This is a vehicles idling since I wasn’t able to take a screen shot at WOT). Ideally you want this value to be between 0 and 1.0 at wide open throttle (WOT), but – 1.0 to 1.0 is acceptable assuming that you don’t have any significant knock corrections (The figure’s values below are not in this range so it is for illustration purposes only. This parameter shown below is your target boost (including altitude and temperature compensations) minus your actual boost (negative values mean you are over the target by the amount while positive values mean you are under). The best way to determine if you are hitting target boost is to monitor the TD Boost Error parameter on the Accessport. If you are underboosting or not reaching target boost, switch to the High Wastegate version. Then, if you are overboosting or exceeding target boost, change to the Low Wastegate version. You should start with the Normal Wastegate version of your OTS map. Each map has differences in wastegate duty cycle tables that allow a vehicle that may not be running target boost to run optimally. If you’ve recently downloaded a map from the COBB website you may have noticed a dropdown menu presenting the High Wastegate (HWG), Normal Wastegate (NWG), and Low Wastegate (LWG) version of the OTS map you’ve chosen. Here we’ll define the differences in these wastegate options and explain how to make sure you’re using the right version OTS map for your vehicle. For the Subaru platform, most vehicles have a wastegate option that can be chosen to better fit your car for its specific conditions. The COBB Tuning Accessport comes with Off The Shelf (OTS) maps designed to support any vehicle of a specific make and model throughout all climates and elevations. By Kyle on Subaru OTS Maps: High Wastegate, Low Wastegate, Normal Wastegate
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