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When you are at low rpms, throttle position varies load REALLY fast. Your throttle body is sized to flow maximum horsepower, which for you is 170hp. However, you can only achieve 170hp at 6000 rpm. For example, at 2000 rpm maybe you have a max output of 1/3rd that. So, it makes sense that 0-100% throttle at 6000 rpm is going to give you 0-100% load. At 2000 rpm, 0-33% throttle is going to give you 0-100% load.
In reality its even more sensitive because of the mechanics of a butterfly valve. By the time the valve is 50% open its probably flowing 75% of what it can.
Does that make sense?
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