Racer Tech

Drag Racer - - Contents -

IF YOU EVER WANTED THE ES­SEN­TIAL FEA­TURES OF A TOP-OF-THE-LINE HOL­LEY GEN 3 UL­TRA CARBURETOR BUT WERE HES­I­TANT TO SPEND AD­DI­TIONAL MONEY FOR HIGH­END EX­TRAS YOU MIGHT NOT USE, HOL­LEY HAS THE CARBURETOR FOR YOU: THE DOM­I­NA­TOR SP.

Avail­able in a three-cir­cuit 1,150cfm de­sign and two 1,050-cfm con­fig­u­ra­tions—two cir­cuit and three cir­cuit—Dom­i­na­tor SPs give you the best as­pects of the sta­teof-the-art Gen 3 Ul­tra carburetor in a bud­get-friendly ver­sion that's per­fect for street/strip ap­pli­ca­tions and even some all-out bracket cars.

Th­ese in­no­va­tive new carburetors, in­tro­duced late in 2016, are 28% lighter than tra­di­tional Dom­i­na­tors yet cost more than 40% less than a new Gen 3 Ul­tra. “It’s a huge sav­ings,” said Hol­ley Se­nior De­sign En­gi­neer Laura She­han. “This carburetor se­ries is for the guys out there that may not take ad­van­tage of the pre­mium fea­tures of­fered by the Gen 3 Ul­tra, such as the idle by­pass sys­tem and high ca­pac­ity fuel bowls, but want the per­for­mance gains that the Gen 3 of­fers. That’s ex­actly why we came up with the Dom­i­na­tor SP.”

For a sig­nif­i­cantly lower price, Hol­ley Dom­i­na­tor SP carburetors of­fer the same patent-pend­ing main body as the Gen 3 Ul­tra, which is 5⁄16-inch taller than Hol­ley’s pre­vi­ous gen­er­a­tion. The added height cre­ates larger ra­dius air en­tries for smoother air­flow, greater con­sis­tency and im­proved throttle response. “The Gen 3 lineup is cal­i­brated for today’s en­gines, today’s fuel,” She­han said. “So is the Dom­i­na­tor SP. Func­tion­ally, they’re the same; the Dom­i­na­tor SP is just stripped down a lit­tle to be more bud­get friendly.”

The Dom­i­na­tor SP in­cor­po­rates an ex­tended air-cleaner flange for easy air-scoop installation with an avail­able air-scoop adapter. It fea­tures all-alu­minum con­struc­tion, tun­able bil­let me­ter­ing blocks, throttle-po­si­tion­sen­sor mount­ing points and han­dad­justable knurled curb-idle screws. Each cal­i­bra­tion has been dyno- and track-tested for proven per­for­mance; like ev­ery Hol­ley carburetor, Dom­i­na­tor SPs are wet­flow tested be­fore they ever go out the door. “It’s not go­ing to leak; it’s not go­ing to fail; it’s go­ing to be ex­actly what you ex­pect when it comes out of the box,” She­han said.

Each one is fully CNC-ma­chined, from the ven­turi throat to the throttle bore, for con­sis­tent, pre­dictable, re­peat­able per­for­mance. “Dom­i­na­tor SPs have the same bil­let me­ter­ing block as the Gen 3 Ul­tra, but in­stead of screw-in emul­sions, they have drilled-in emul­sions,” She­han said. “It’s still a bil­let me­ter­ing block, which is the brain of the carburetor, the same as Gen 3 Ul­tra. If you’re not a su­per high-end racer, rac­ing a lot and run­ning your en­gine on the dyno all the time, you prob­a­bly shouldn’t touch the emul­sions stack any­way. You can get in trou­ble if you don't know ex­actly what you’re do­ing.”

In­stead of an ad­justable sec­ondary throttle link­age like the Gen 3 Ul­tra, the Dom­i­na­tor SP comes from the fac­tory with a pro­gres­sive ex­ter­nal link­age al­ready in­stalled, and you get a one-to-one link­age in the in­cluded kit.

“The Gen 3 Ul­tra is ‘pre­mium pre­mium,’ the best of the best,” She­han said. “We worked with race en­gine builders on the dyno and at the race­track to make it the best high-end carburetor on the mar­ket. Dom­i­na­tor SPs are for the racer who has the abil­ity to tune his carburetor but doesn’t want to mess with it ev­ery day: the bud­get-con­scious guy, the street/strip Satur­day night racer who likes mak­ing a few jet changes based on the weather. You can take your car out a cou­ple times a month, maybe change jets a few times, but be­fore long you’ll prob­a­bly just leave it alone be­cause it’s al­ready set up per­fectly with the same proven cal­i­bra­tion as Gen 3 Ul­tra carburetors.”

/ Hol­ley SP carburetors are 28% lighter than tra­di­tional Dom­i­na­tors but don’t cost much more than half what a state-of-the-art Gen 3 Ul­tra carburetors does.

/ An in­cred­i­ble amount of thought has gone into ev­ery as­pect of the new SP carburetor right down to the knurled curb-idle screws that make it so easy to ad­just by hand.

/ Three vari­a­tions are avail­able: a three­cir­cuit, 1,150-cfm de­sign and two 1,050-cfm con­fig­u­ra­tions, a two cir­cuit and a three cir­cuit.

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