NZ Performance Car - - Inside Line -

As the lin­eage has been around for decades, the op­tions on how to bump power lev­els of the hum­ble SR are al­most end­less. With so much in­for­ma­tion out there, and every back­yard ex­pert hav­ing their own opin­ion, it can get pretty hec­tic try­ing to pin down the right com­bi­na­tion for your car. De­pend­ing on how you in­tend to use it, your ideal com­bi­na­tion may be com­pletely dif­fer­ent to how your mate has done theirs. To get a bet­ter idea on where to start with bolt-on up­grades, we turned to Gen­eral Man­ager of ST Hitec, Ste­wart Mearns. “Be­fore we un­der­take any mod­i­fi­ca­tions with clients’ ve­hi­cles, we work through a thor­ough plan. This con­sists of what they have al­ready done to their car, what their goals are, what driv­ing ex­pe­ri­ence they have, and what the in­tended use is. The rea­son for do­ing this is set­ting up the most suit­able pack­age for not only this ini­tial stage, but for fu­ture mod­i­fi­ca­tions and be­ing able to carry the parts for­ward where pos­si­ble.

“It’s about set­ting a re­al­is­tic goal. For what we’d call a stage one power in­crease (160–170kW at the wheels) you would be look­ing to do a few key up­grades. Firstly, air flow in. We rec­om­mend an A’PEXi Power In­take kit, as it’s tried and proven to be one of the best sys­tems on the mar­ket. Next is flow out. Care­ful se­lec­tion of the ex­haust not only nets you a good sound and im­proved per­for­mance, but can fu­ture-proof your car for the next stage of mod­i­fi­ca­tions — some­thing like a com­bi­na­tion of Tomei or HPI turbo out­let, with front pipe and cat-back ex­haust from proven man­u­fac­tur­ers like HKS, A’PEXi, Tomei, or new player X-Force. The fi­nal piece of the puz­zle for stage one is proper boost con­trol. We rec­om­mend the HKS EVC-S. It’s an ef­fec­tive unit that is easy to use.

“When you even­tu­ally want to make more power, you can look to stage two (200–220kW at the wheels), where com­po­nents such as front-mount in­ter­cool­ers, fuel pump up­grades, and ECU op­tions that will al­low you to run up­graded in­jec­tors, larger air-flow me­ters, and dif­fer­ent fuel types in fu­ture. It’s im­per­a­tive that af­ter each stage, the car is checked over and tuned on the dyno to en­sure air-fuel ra­tios, ig­ni­tion tim­ing, boost con­trol, etc. are all cal­i­brated to give the client a ve­hi­cle that will drive per­fectly and re­main re­li­able.” ST Hitec // 09 573 5575 // sthitec.nz

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