But to answer your question . . . .
I suspect that the main reason that you can't chirp from a stop is that the torque curve of your motor has "shifted" up 1000 RPM from 2000 RPM stock (at 270 ft-lb (stock Lo-Po rating)) to 3000 RPM (300 ft-lb (stock Mustang rating)). Although the Mustang torque curve doesn't ramp down too quickly (vs. RPM), I suspect that your off-idle torque is lower with the HO setup.
I suspect that the main reason that you can't chirp from a stop is that the torque curve of your motor has "shifted" up 1000 RPM from 2000 RPM stock (at 270 ft-lb (stock Lo-Po rating)) to 3000 RPM (300 ft-lb (stock Mustang rating)). Although the Mustang torque curve doesn't ramp down too quickly (vs. RPM), I suspect that your off-idle torque is lower with the HO setup.
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