MARK DREW’S HR Holden Premier has been making huge gains in the past couple months – going from a reasonably quick 10-sec streeter to a full house eight-second street ‘n’ strip warrior.
Last time we looked at it the column shifter street and strip machine was running 9.22 at 155mph, but with the intake temps starting to get out of hand Mark decided some changes were needed. They fitted a bigger intercooler to start things off and changed the rear housing on the turbo to reduce back pressure. That made a difference, but the car still seemed to have something holding it back so they took things to the next level.
“I got my brother Rod to make me a custom intake manifold,” Mark says, “The cast alloy one I was using was holding it back a bit I think. Plus we fitted a tighter Dominator converter, added a 4in dump and exhaust system, and cranked up the boost to 19psi.”
On the MPW dyno this pushed the power up over the 800rwhp mark with a best of 807.3rwhp (602rwkw) and the car certainly responded at the track. Standing up on the back wheels the HR ran 8.84 @ 159mph, quickly followed by an 8.88 @ 161mph and then an 8.76 at 160mph. A pretty solid result for a car with no roll cage or parachute. Something that Mark is looking to remedy soon.
“It’s cool doing it the way it is, but the car starting to move around a bit now so it’s time to put a cage in it and get it tech’ed,” Mark says. “It weighs 3650lbs with me in it, and the cage will add a bit extra, but it should stiffen things up too. If we get it done in time I’ll look at taking it on Drag Challenge in October.”
Check out this awesome video from fullboost.com.au and watch this Holden fly!