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No formula. Too many factors.
Honda's older engines often had two torque peaks. The cam is the largest way to shift torque around, and Hondas generally have two (or more) different cam profiles. As you increase the cam's lift and duration (larger lobe size), you shift the torque peak up in RPM (reducing torque at low RPM). VTEC exists specifically so that engines can have a cam that feeds enough air at 7000rpm+, while also not gutting the engine in the range people actually drive in.
Some other factors that move peak torque around:
-Cam lobe phasing
-Intake runner length
-Intake runner width
-Intake diameter
-Header length
-Header width
-Header pattern (e.g. 4-2-1 or 4-1)
-Intake and exhaust valve size
-Engine stroke ratio
-Engine rod ratio
-Compression ratio
-OTTO vs Atkinson vs Miller cycle
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