Based upon this dyno chart, you're not producing near enough whp to push the car into the 4 seconds 0-60 range. You need to be pushing
315+ whp you're nowhere near that let alone 304.5 BHP The dyno charts you have provided are measured at the flywheel, not at the wheels.
So realistically, you're making around 243-244 whp & 340.754 ft lbs or torque ideally, which is not enough to push the combined weight of yourself, the weight of rolling mass, into the mid to low 4 second range. This particular formula doesn't take in account, driver response and friction loss,. With this formula the best you'd be able to eclipse if everything was ideal is; 5.00 seconds and this is without, your weight, fuel weight and traction loss.
Mathematically speaking; Adding in your weigh say 160 ( average male), fuel weight @ 6 lbs per gallon, with 8 gallons in the tank, it's closer to 0-60 mph 5.30 seconds ideally. Of course this is taking in account, ideal ambient conditions, and precise driver response. Less than this, will produce much slower times, due to loss of horsepower from heat soak and and less than ideal air density.
To give you an example;
a tenth of a second is less than a blink of the eye. 1000 times faster than a human breath. So any hesitation by you or the car to responded according, will add to the overall time. Keeping in mind no one is perfect, it doesn't exist on this world. Ideal is as close to perfect as you're going to get.
Of course, I haven't added in altitude, along with a slew of other factors which also need to be considered. This will drop ideal horsepower and torque. All will accumulate additional time. So in reality, the 6.05 to 7:01 second range you posted is about right and the best you can expect.
This
^ is the actual math nothing more or less and it doesn't perceive anything different. There are particular formulas, which will predetermine applicable performance from cars. Based upon particular specifications; power to weight ratios are very important. Even if you shed 500 lbs from the i30N, you still won't be able to eclipse mid to low four second 0-60 times or mid eleven second quarter mile times.
@TarmoT & @Dan_bush27 YES! With you're specific modifications,
NO and you're nowhere near either
! Mathematically speaking, TarmoT and Dan_Bush 27 are smack dab in the 4.40 0-60/low -mid 11 second quarter mile range.