The old version has that bug. Please update to version 4.3.3 or later.

The picture below is an image a log screen of a driving for which the Target G was set for 0.3 G.

Learn first to stop your car with constant braking G-force. Unless you can control braking G-force accurately, you cannot maintain cornering G-force constant (= turn the ball neatly). Since cornering G-force depends on the corner radius and the cornering speed, you cannot stably control cornering G-force unless you have a good sense of achieving an […]

The objective of the scoring system is to perform “cornering with constant G-force,” and it evaluates the driver’s ability to control G-force on the car. The driver is evaluated on the basis of “matching Braking G and Cornering G with the Target G (plus acceleration being not delayed).” (The ability to control the driving line […]

First, try to drive your car on general roads without yielding high G-forces. When the detected G-force exceeds the set G Limit (the default is 0.4 G), an alarm bell sound rings. Drive your car trying not to ring this alarm sound. (When you have become good enough, try a new G limit of 0.3 […]

There are videos of using G-Bowl (device) in the Links page. They are videos of driving on a mountain road, a Tokyo Expressway and a circuit and of practicing braking and cornering (steering).  

Many people tend to mix up car vibrations from the road with the vibration of the upholstery. To show their difference, we show graphs (top) when an iPhone was set on the dashboard of a car and those (bottom) when it was set, covered by a floor mat, on the floor of the same car.。 […]

It is best to fix you iPhone in a rigid place, that is, a place near the car body (for example, the floor or the trunk bottom). The center console is good in some cars. It is also good to set your iPhone on the floor of the passenger’s seat (if available, place a floor […]

Fine vibrations appearing in the graph are mostly caused by the vibration of the upholstery. Placing your iPhone on the dashboard or a seat or using one of many iPhone stands available on the market is not recommended. You tend to set your iPhone in such a place to see the screen easily. But it […]

You can switch between the two display modes by long-pressing (1 sec) the lower graph with two fingers.