Shortly after this, if the needle doesn't go below 7/8 of full boost, the boost pressure will release and your Overcharged Turbo will engage, giving you a boost of speed.Īfter releasing the boost pressure via your Overcharged Turbo, the needle will need to go below the aforementioned 7/8 mark in order to begin charging your turbo boost again.

This means that the boost pressure is close to release. Once the boost gauge is full, the needle will eventually begin to shake if you have the Epic Tuning Part ' Overcharged Turbo' equipped. On Hot Rod and Muscle Car, you will need to upgrade the Supercharger separately from the Engine.

Note: On Monster Truck, Super Diesel, and Rally Car, you will need to upgrade the Turbo separately from the Engine. This helps determine the Boost power and how fast or slow each boost is. Typically, the engine makes a hissing sound while the boost is on, and makes a whining sound when you turn the boost off.

You will also notice that the higher the Engine level is, the louder the boost will be on each vehicle. Depending on what level you have the Engine upgraded to for the vehicle you're using, the maximum pressure for the boost gauge will vary. Releasing the accelerator or braking will decrease boost, even in the air.

The dial will raise from zero to full as long as you hold down the accelerator uninterrupted. Every vehicle has a Boost Gauge in the bottom center which indicates the current boost pressure.

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