Sim Doctor Tuning Handbook

Gran Turismo Setup Secrets

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Finding the correct gear ratios and final drive based on the power visual graph in game. 

Here's a step-by-step approach to help you make informed decisions:


1. Understand the Power Visual Graph: Take a close look at the graph, which represents the power delivery of the car across different RPM ranges. Identify the RPM range where the engine produces maximum power and torque. This range is usually referred to as the "power band"

2. Set up acceleration and braking first to get the car to your liking, then use initial to fine tune the overall effect/engagement of the Braking and Acceleration Sensitivity portions of the LSD

Peak Power is stated here, this is where you ideally want to identify the shifting point (between 6,800 and 7,500 RPM).

Unfortunately the power band in point 1 does not give you an exact start of the powerband, this needs to be done by testing the car on track and eliminating any bogging down between gear shifts.


3. Adjust individual Gear Ratios: Firstly set the Top Speed to the estimated speed you require for the circuit's longest straight. Adjust the first gear and last gear before adjusting the ones in between.
First gear needs to be lengthened or shortened to reduce wheelspin or prevent bogging down when launching from a standing start.

Last gear needs to be set to where you expect the top speed to be reached on track.

The remaining gears should be adjusted to remain in the power band, these also need to be adjusted so that the exit or certain corners allows maximum power delivery without RPM being too high and inducing wheelspin/oversteer, as well as making sure it falls within the power band.

After Gear change

Change Required

Out of Power Band (Bogs down)

Increase Individual Gear Value

Gear too short (not utilising the rev range enough)

Decrease Individual Gear Value


4. Final Drive Ratio: Once you have optimized the individual gear ratios, the final drive ratio should be adjusted to tailor the car’s speed to a specific track. A low final drive ratio provides better acceleration but sacrifices top speed, while a high final drive ratio enhances top speed but may reduce acceleration. Choose a final drive ratio that complements your racing style and the characteristics of the track you'll be competing on.


Remember, the ideal gear ratios and final drive ratio can vary depending on the specific vehicle and track conditions. Therefore, it's crucial to test and iterate these settings to find the optimal configuration that suits your racing goals.