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It can also be used to assist in economical driving if that's your bagīy driving while keeping the boost pressure -ve you can use it as a pseudo economy gauge.įorge Motorsport produced a TT specific model which was nice but it wasn't popular, I think more because of the image a boost gauge has and that the benefits are not understood too well. If the boost pressure is too high then perhaps a diverter valve or wastegate is malfunctioning, If the boost is too low then perhaps there is a leak in the vacuum system or again a DV failure, either issue could lead to engine troubles and boost gauge will give the advantage of an early warning of problems to get looked into. With these figures a boost gauge will give you an additional warning of problems that may be impending. for mine (in bar) -0.77 vacuum deceleration, -0.60 at idle, 1.4 nominal, 1.7 peak. With a healthy car you can get used to the optimum Vacuum and PressuresĮ.g. The whole turbo system around the TT engine relies on a sealed vacuum system that controls the turbo pressure, the fuel pressure regulation, the diverter valve opening and the turbo wastegate. So apart from a fancy moving dial that provide the dash with a bit more animation, WHY would you want to fit one? Why Audi didn't fit a boost gauge to a sports car like the TT is any ones guess. With a lot of modern turbo charged cars one of the most common gauges on the dash is a turbo pressure boost gauge.