Racer Tech

Drag Racer - - Over Center -

HOL­LEY’S LAT­EST CRE­ATION, THE SNIPER EFI RACE SE­RIES FABRI­CATED MAN­I­FOLD, IS AN IN­NO­VA­TIVE NEW DE­SIGN THAT AD­DRESSES, POINT BY POINT, EV­ERY­THING THAT

RAC­ERS THEM­SELVES CAME UP WITH TO MAKE THE ORIG­I­NAL SNIPER EFI IN­TAKES LAUNCHED IN 2015 EVEN BET­TER.

Th­ese all-new man­i­folds, de­vel­oped for the Ford Coy­ote 5.0L and GM LS1/LS2/LS6 plat­forms, de­liver im­proved per­for­mance for hard­core drag rac­ers search­ing for a com­pet­i­tive al­ter­na­tive to one-off sheet-metal in­takes. “The big­gest thing we learned from work­ing with rac­ers was that un­der boost, en­gines—es­pe­cially en­gines with a two-step—need a man­i­fold that’s welded both inside and out,” said An­thony Coles, di­rec­tor of busi­ness devel­op­ment for Hol­ley Per­for­mance Prod­ucts. “The weld fa­tigue that boosted en­gines can throw at a street/strip in­take can some­times be too much, so th­ese have welded seams inside and out. They’re also 1mm thicker.”

A mil­lime­ter may not sound like much, but it rep­re­sents a 25% in­crease in both over­all strength and rigid­ity, and the greater weight of the stur­dier sheet metal is more than off­set by the strength gains. Man­u­fac­tured from 5mm (13/64inch) T6061 sheet alu­minum, each man­i­fold is pre­ci­sion-fix­tured for a per­fect fit and 100% TIG-welded for max­i­mum struc­tural in­tegrity.

Sniper EFI Race se­ries fabri­cated man­i­folds fea­ture equal run­ner lengths with a ta­pered top to in­crease ve­loc­ity and more evenly dis­trib­ute air­flow to all eight cylin­ders. Longer in­takerun­ner lengths cre­ate a wider op­er­at­ing range (2,100-8,200 rpm), and a larger in­take plenum makes them ideal for boosted ap­pli­ca­tions in gen­eral and race en­gines in par­tic­u­lar.

Once again, what rac­ers wanted, they got, and what they wanted was more. “A lot of the pow­er­ad­der guys wanted big­ger plenums—they don't care about hood clear­ance —so we made the plenum wider,” Coles said. (It’s now a full liter big­ger.) “We length­ened the run­ners, too, but rather than change the over­all height of the in­take, we moved the run­ners fur­ther into the plenum.”

The Race se­ries man­i­folds are avail­able in two dis­tinct fin­ishes, bright sil­ver or black-an­odized. Ready to bolt on out of the box, they come com­plete with a high-flow fuel rail kit with a larger -10 cross­over line, a throt­tle­body spacer and a re­mov­able top that makes them easy to in­spect, mod­ify and add sen­sors to.

“This is geared for a group of rac­ers, but it’s geared specif­i­cally for them,” Coles said. “It eas­ily han­dles up to 1,400 horse­power, and that’s where a lot of th­ese guys are, the Drag LS guys and the Rene­gade guys. In so many ways, they’re lim­ited to fac­tory stuff to keep the class af­ford­able and some­what stock. And this is a lot more ro­bust than stock.”

If you hap­pen to com­pete in a cat­e­gory with a 90mm limit on throt­tle bod­ies, such as NMRA’s Rene­gade divi­sion, you’re in busi­ness. That’s ex­actly the size for­ward-think­ing Hol­ley en­gi­neers made the throt­tle body. “In the not­too-dis­tant fu­ture, we’ll more than likely ex­pand this same se­ries of in­take with 92mm and 102mm throt­tle body sizes,” Coles said.

Run­ning a first-gen­er­a­tion Sniper in­take, Rene­gade star “Bad” Bart Tobener, who was in­stru­men­tal in the de­sign of both that man­i­fold and th­ese new Race se­ries Snipers, made the first seven-sec­ond run for the S550 plat­form last year at Indianapolis on just his sec­ond full quar­ter-mile pass ever in the car.

Ini­tial re­sponse to the Sniper EFI Race se­ries fabri­cated man­i­fold has been great. “It’s al­ready been ap­proved for the Rene­gade cat­e­gory,” Coles said, “and we ex­pect to see it on a lot of cars in that class, Drag LS and Coy­ote Mod­i­fied in 2017.”

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