Remember, these numbers came with a static compression ratio of just 8.8:1, hardly what you'd consider optimum for performance use. Two more points of compression (to 10.8:1) would easily increase the power output by a solid 50 hp or more. Best of all, the power gains would occur throughout the rev range (basically a jump of 7-8 percent). As it was, the wild combo produced a broad torque curve, bettering 600 lb-ft of torque from 3,900 rpm to 6,700 rpm. Basically, step on the gas of this 540 and watch the tires go up in smoke. Nitrous 540 Combo Happy as we were with our two distinct mild and wild combinations, we ran one more test. By adding nitrous oxide to the mix we could further transform our wild combination into a serious street/strip terror. Anytime you add an extra 250 hp to the mix, things really start getting interesting. To add the nitrous to the 540, we decided to remove the Weiand tunnel ram and replace it with the Weiand Team G. Unlike the intake used on the mild combination, this team G was designed to accept a larger 4500-sereis carburetor. Plenty capable of supporting the power output of the wilder combo, the single-plane Team G allowed us to install the awaiting NOS Cheater Competition system. Adjustable from 150 hp to 250 hp, the NOS Cheater system was perfect for our large-displacement, low-compression 540. Replacing the tunnel ram with the Team G resulted in a change in peak power numbers from 777 hp and 681 lb-ft of torque to 770 hp and 663 lb-ft of torque. Adding a 250hp shot of nitrous (102 fuel and 93 nitrous jetting) resulted in a final power number of 1,022 hp and 839 lb-ft of torque (though it was necessary to run a smaller fuel jet to lean the mixture out). Given the power output of the 540, we needed plenty of carburetor. Knowing this, we installed a 2-circuit Holley 1150 Dominator carburetor (part number 7320). Given the power output of the 540, we needed plenty of carburetor. Knowing this, we instal Prior to running the nitrous, we made a few baseline pulls with the Team G and Holley Dominator. Jetting was required to dial in the new induction system. Not quite as powerful as the tunnel ram, the 540 still produced 770 hp and 663 ft-lb with the single carb system. Prior to running the nitrous, we made a few baseline pulls with the Team G and Holley Domi The output of the NOS Cheater system was adjustable via jetting for the solenoids. We installed the 102/93 jet combination but eventually reduced the fuel jet down to 91 to dial in the air/fuel mixture (it was rich with the stock jetting). The output of the NOS Cheater system was adjustable via jetting for the solenoids. We inst Once everything was installed and tuned, the wild combo stepped up the power nicely with peak numbers of 777 hp at 6,600 rpm and 681 lb-ft at 5,600 rpm. Once everything was installed and tuned, the wild combo stepped up the power nicely with p Mild vs. Wild 540 Equipped with the Trick Flow Power Port heads, mild XR288HR hydraulic roller cam and Weiand Team G intake, the 540 produced 635 hp and 645 lb-ft of torque. Stepping up to the dart Pro 1 heads, custom solid roller cam and Hi-Ram tunnel ram stepped the peak numbers up to 777 hp and 681 lb-ft of torque. As is evident, the wild version of the 540 shifted the torque curve significantly compared to the mild version. Where the mild 540 produce peak power at 5,700 rpm, the wild version did so at 6,600 rpm. Mild vs. Wild 540 Equipped with the Trick Flow Power Port heads, mild XR288HR hydraulic NA vs. NOS 540 (250 shot) This graph illustrates the great thing about nitrous. It literally transformed the power curve at the touch of a button. After replacing the tunnel ram with a Weiand Team G and Holley Dominator carburetor, the 540 produced 770 hp and 663 lb-ft of torque. After some minor tuning with the 250hp shot, the NOS Cheater system upped these numbers to 1,022 hp and 839 lb-ft of torque. Note that we engaged the nitrous late in the rev range, but huge torque gains are available with earlier engagement. NA vs. NOS 540 (250 shot) This graph illustrates the great thing about nitrous. It liter SOURCES Trick Flow Specialties 1248 Southeast Avenue Tallmadge OH 44278 330-630-1555 www.trickflow.com Dart Machinery 353 Oliver Street Troy MI 48084 248-362-1188 www.dartheads.com Comp Cams 3406 Democrat Road Memphis TN 38118 800-999-0853 www.compcams.com/ Holley Performance Products 1801 Russellville Rd. Bowling Green KY 42101 270-781-9741 www.holley.com Moroso 80 Carter Drive Guilford CT 06437 203-453-6571 www.moroso.com « | 1 | 2 | 3 | 4 | View Full Article By Richard Holdener Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!