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Previously 2001 Suzuki TL1000R, On Order: 2022 Yamaha YZF-R7 BLue, On order: 2022 Honda Grom Yellow.

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Air resistance increases as the square of the speed increase.. It’s a non-linear relationship. Double the speed... you get 4 times the air resistance.

horsepower must increase as a cube of the speed increase... another non-linear relationship. Double the speed, you need 8 times the horsepower.

let’s assume the R7 does have a top speed from the factory of 143 with 74hp. We don’t know exactly how much hp it has yet, so we’ll make some assumptions to figure out what’s needed to get to 150mph:

150/143=1.04895

Cube that and you get 1.154 times the starting horsepower.

So to get to 150mph it requires us to find 15.4% more power than the bike comes with. So can approximate that we need to have 74 * 1.154 = 85.396 hp... with no other changes in circumstances.

So theoretically about 11.4hp more would be needed to get to 150.

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Previously 2001 Suzuki TL1000R, On Order: 2022 Yamaha YZF-R7 BLue, On order: 2022 Honda Grom Yellow.

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24 Posts

So, by way of a claimed data point from Yamaha of the R7 being able to do about 10mph more than the MT07, that means the R7 can do 143mph (again according to Yamaha), with a best guess of 67 rwhp.

67 * 1.154 = 77.318

According to the formula illustrated on the picture, We’d need to find about 10.3 rwhp to theoretically make 150mph, if all other circumstances remain unchanged.

Im such a nerd. Lol

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Previously 2001 Suzuki TL1000R, On Order: 2022 Yamaha YZF-R7 BLue, On order: 2022 Honda Grom Yellow.

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24 Posts

That extra theoretical 3 mph at the same rpm you mention... 3 mph from 133 to 136 at the same engine rpm requires it to put out 4.6 more horsepower to achieve, with the MT07 drag coefficient. This is to illustrate that a taller gear to make rpms available does not equate to higher speed capability. The R7 achieved the higher speed more so through reducing drag.

We’ve wandered into the weeds a bit. I’m going to turn this back toward the original question.

Yamaha has already claimed “about 10 more mph for a stock R7 over a stock MT07” due to a lower drag coefficient, and other small changes so all the details are accounted for and Yamaha told us what they got. If a stock MT07 does 133mph for example, then a stock R7 under the same conditions should do about 143mph(10mph more).

143mph of a stock R7 was the known starting data point in the question. That made answering the question real simple, so we need not overthink it. So we applied a known formula to answer the original question about getting the bike to 150mph under the exact same conditions that established the 143.

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