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Originally Posted by Baldeagle
Respectfully disagree. To accomplish the same amount of work with 4.8% less torque multiplication means it needs about 4.8% more torque/hp.
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4.3 gears vs. 4.1 don't give you 4.8% more torque at the wheels *at all speeds*. In 1st gear, they'll give you that until you have to upshift to 2nd gear, and then you'll have WAY LESS torque to the wheels for a couple/few mph. Same every upshift, you have to go to a taller gear sooner, and briefly suffer much taller gearing. On *average* it's the same.
Gearing does not give you more power! It might gain you a bit from 0-30mph, but beyond that it's a wash.
1/4-mile ET is sensitive to gearing, but mph, not so much...
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Using the original HP value from the formula, the 2022 BRZ has 234.4hp. 4.8% is 11hp. What would that equivalent of 11 hp do? If you added 11 hp to 234 hp, you obviously get 245 hp. If you plug 245 hp back into the formula, trap speed should increase from 101 mph to about 102 mph.
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That is not how it works...
Again, gearing does not magic you more power at the wheels! You get an advantage until you have to upshift sooner, then you are at a disadvantage.
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A 2022 BRZ with a 4.3:1 final gear should trap at 102 mph versus 101 mph with the 4.1:1 final gear. We can debate if 1 mph is meaningful or not, but it is related to gearing and equates to about 11 hp given the same gear ratios.
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Gearing is a massively overrated mod, and this basic misunderstanding is why. If I replaced my 4.3 gears with 4.88, it would not make my 205hp car act like it had 233hp. It would surely improve 0-30mph times, but 1/4-mile trap speed would suffer as I'd have to be in 5th gear for a goodly portion of the big end of the track. Power/weight is power/weight. Diff gearing doesn't do anything magical, it gives you slightly more thrust at the wheels at most speeds but a whole lot less at some speeds.