Of course you can't increase HP without increasing Torque or RPM.
What I mean is increasing HP without increasing PEAK Torque and RPM.
If you look at the dyno below of a stock G90 M5 as an example, increasing WTorque @7000 RPM from 500 lbft to 600 lbft (way below the 700 lbft peak Torque and way below any TCU Torque limit) will increase WHP from 666 to 800.
As for heat I don't think it's an issue, we've been tuning M5s to 800 HP easily without any heat issues.
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Originally Posted by Crazy1323
That is not necessarily true. Horsepower is torque multiplied by rpm’s divided by a constant. At the same engine RPM it is mathematically impossible to increase power without increasing torque. If torque stays flat and RPM’s increase then horsepower increases.
Transmissions have both a torque limit and a horsepower limit. For example the transmission in the M5 has a max torque of 1,000 nm (737 Ft lbs). If it made this much torque at 10,000 RPM’s (extreme example) then that would be about 1,400 horsepower. The transmission cannot handle this amount of power.
I don’t know if we are currently at the power limits of the M5’s transmission, but I bet we aren’t far.
As RPM’s, and therefore horsepower, increase so does heat. A transmission can only dissipate so much heat which is why they have power limits on them. The Panamera Turbo S has 771hp using likely the same transmission. I bet that is the power limit (about 575 KW)
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