With his pregnant partner and two other young children in the car, Te Ariki Wiringi drove at 120km/h past two Rotorua schools.
He was enraged after having an argument with his partner about her past relationships and later told police he wanted to "scare" her.
His partner begged the 22-year-old to slow down, fearing for the children at Selwyn Primary School and Western Heights High School as he sped dangerously on Old Quarry Rd, an area with a speed limit of 50km/h.
But he didn't stop, saying he didn't care if he crashed and killed them all, details in police documents reveal.
Wiringi is now behind bars as his former partner is about to give birth to their new child after he pleaded guilty in the Rotorua District Court to three charges.