The Tuning "Benchmark" Performance Index Is Often Wrong, This Is Bad

For a D-Class event race in career, I slightly tuned up a Alfa Romeo Giulietta Verde, I added a back wing, an additional 5 horse power, 1 set of anti roll bars and a Racing differential. The performance index says it goes 0-60 in 6.5 seconds but I did test drive and counted and it was about 4.5 seconds. Has anyone noticed the performance Index is often wrong and off by 1-2 seconds for 0-60?

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No one cares about this serious problem?

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  • It’s Sunday morning/afternoon.

  • It’s only been 30 minutes since you made your post.

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I care, but all the pi is good for is containing your car into a class. The numbers on the graph and in the tuning menu are irrelevant, and inaccurate. Use the actual performance of the car to give it its real performance. I have cars that have higher numbers in handling, but handle worse ( same drivetrain layout and suspension setting, similar size) than one that has lower handling numbers. They are barley a guideline to tuning.

They are performance estimates. Just like in real life 0-60s vary due to temperature, road surface, bla bla bla.

I only use the benchmark for a baseline. I will uses that number in comparing diffrent builds or tuning changes,
but only to that car.

As others have stated, the benchmark is rarely very close to the actual numbers you will get from the tune. It is more for just a general quick snapshot of what changes a tweaked slider has on performance. The actual numbers are WAY off what you will observe in a test drive.

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I think it tested in an auto. Like the AI

I don’t even look at this benchmark because I don’t remember it really being accurate in any Forza. Why have it? I guess a general guideline??? I don’t know but don’t care about it really anymore.