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The Demon Engines Low-Buck 454 Engine Build Part III

For The Last Installment, We Add A Little Boost To...

By Richard Holdener, Photography by Richard Holdener

Before subjecting the Demon 454 to some boost, we made one final change: swapping the dual-plane RPM Air-Gap for a single-plane 454R. We were concerned about proper fuel distribution with the dual-plane and opted for the single-plane. The single-plane would naturally hurt power down low, but we figured there would be more than enough power to go around once the boost came up. Besides, the reason we assembled the turbo kit in the first place was to test the strength of the internal components in the Demon 454. With everything hooked up and some extra insurance present in the form of Lucas Oil octane booster (with our 91-octane premium unleaded), we started making partial power pulls. A few jets here and there to lean out the mixture, and we were eventually rewarded with peak numbers of 776 hp and 732 lb-ft of torque. Torque production with our quickie turbo kit exceeded 650 lb-ft from 3,500 rpm to 6,200 rpm. There was plenty of power left with even greater boost pressures, but we were satisfied with the results of this exorcism. Obviously, 20 to 25 dyno pulls cannot simulate the years of abuse with a turbo kit, but they do indicate that the Low-Buck 454 should last almost indefinitely at the lower power levels.

DEMON 454-NA VS. TURBO
N/A TURBO GAINS
RPM HP TQ HP TQ HP TQ
3,500 355 533 443 665 88 132
4,000 406 533 527 692 121 159
4,500 461 538 619 723 158 185
5,000 507 533 696 731 189 198
5,500 540 516 743 710 203 194
6,000 562 492 776 679 214 187
6,400 551 452 767 630 216 178

It is amazing what 7 to 8 psi of boost does to a big-block. Already impressive at 564 hp and 542 lb-ft of torque, the low-buck turbo kit improved the power output to 776 hp and 732 lb-ft of torque. Despite the use of a single-plane intake that reduced low-speed power production compared with the Edelbrock Performer RPM Air-Gap, boost response from the 74mm turbo from Comp Turbo was impressive. Of course, the stationary load on the engine dyno is never simulated in the real world, but we had a solid 8 psi of boost available at just 3,500 rpm.

DESCRIPTION PN SOURCE PRICE
Comp Turbo 74mm NA eBay Motors $895.00
Hyper Gate 45mm wastegate TS-0504-1001 Turbosmart USA 300.95
Edelbrock 454R 2907 Summit Racing 299.95
Hedman shorty headers 68370 Summit Racing 59.95
T4 and wastegate flanges N/A Local muffler shop 30.00
Carburetor CSU850BT CSU 1,050.00
Carburetor bonnet CSU1001 CSU 149.00
Miscellaneous fittings and hoses N/A local hardware store 29.95
TOTAL $2,814.80

SOURCES
Comp Cams
3406 Democrat Road
Memphis
TN  38118
800-999-0853
http://www.compcams.com
Probe Racing
2555 West 237th Street
Torrance
CA  90505
310-784-2977
http://www.probeindustries.com
Holley/Hooker
1801 Russellville Road
Bowling Green
KY  42101
270-782-2900
www.holley.com
Comp Turbo
221 West Allen Avenue
San Dimas
CA  91773
909-599-5757
http://www.compturbo.com
Turbosmart
11650 Mission Park Drive
Suite 103
Rancho Cucamonga
CA  91730
909-476-2570
www.turbosmartonline.com
Carburetor Solutions Unlimited
17367 Reed Street
Fontana
CA  92336
909-851-6955
www.camresearch.com
Demon Engines
Sante Fe Springs
CA
562-694-2559
www.demonengines.com
Dr. J's Performance
436 S Montgomery Street
Orange
CA  92868
714-808-9780
http://www.j-performance.com
L&R Automotive
13731 Bora Drive
Sante Fe Springs
CA  90670
562-802-0443
www.lnrengine.com
Procomp Motorsport
Rialto
CA
909-605-1123
www.procompelectronics.com
By Richard Holdener
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