the knock sensor is the main reason for that in hyundai's. if the car isen't knocking at the red line the car will continue to rev but like cottonmouth said your engine isen't making any power up there and all you are doing is hurting your valvetrain.
i think the tach is just off... and sometimes its not... im thinking this because when i paid close attention the car sounded the same at when it was hitting at 6500 as it did hitting at 7800... the car was still accelerating as i approached 7800 so... idk wth
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