How to Adjust Insufficient Supercharger Pressure?
2 Answers
Methods for adjusting insufficient supercharger pressure: First, remove the outer cover of the supercharger. Inside, there is a small screw with a nut at its end. Loosen this nut, then shorten the screw to increase the supercharger pressure. After adjustment, tighten the nut and reinstall the cover. It is advisable not to adjust new superchargers arbitrarily, as manufacturers explicitly prohibit unauthorized adjustments to avoid machine damage and more harm than good. If an old supercharger fails, simply replace it with a new one. When experiencing insufficient supercharger pressure and lack of power during uphill driving, consider making an adjustment. The supercharger is pre-adjusted upon leaving the factory and will automatically release pressure when it exceeds 4Mpa.
I spent a long time troubleshooting this issue last time. Insufficient boost pressure is most commonly caused by air leaks in the piping. First, you need to use a flashlight to check all rubber hose connections by pinching them and listening for any hissing sounds. Pay special attention to the thick pipe between the turbo and intercooler—just half a turn loose on the clamp can cause a 30% pressure drop. If the pipes are fine, there's an 80% chance the blow-off valve is slacking off—external blow-off valves on modified cars are prone to sticking. Last month when tuning boost for my buddy's GTI, tightening the adjustment screw half a turn increased pressure by 0.2 bar. Oh, and for older cars, don't forget to check turbo blade clearance—if you can wiggle the blades more than 3mm with your finger, it's time to replace the turbo. When adjusting boost pressure, it's best to do it gradually with a pressure gauge. Cranking up the pressure too aggressively risks blowing the engine.
