When it was time to hit the button, we went from 91-octane pump gas to 110-octane VP Racing fuel for the 100- and 175hp NOS pulls. Then we ran C-16 VP race gas for the 300hp NOS pulls. When it was time to hit the button, we went from 91-octane pump gas to 110-octane VP Racin Since Holley's inline EFI fuel pump could not provide enough fuel to feed the engine and nitrous combined, Vrbancic used this Product Engineering pump and matching regulator. It had no trouble feeding the engine and nitrous system at a constant 43-45 psi. Since Holley's inline EFI fuel pump could not provide enough fuel to feed the engine and n Checking flowing fuel pressure with any nitrous system is critical. The NOSzels use a -4 AN fuel line, so we made this -4 to -3 AN adapter by slicing the tapered end off the -3 side in a lathe and securing the proper jet with a -3 nut. Then we turned on the fuel pump and set the pressure to the recommended 43 psi with the gas flowing into a 1-gallon can. Checking flowing fuel pressure with any nitrous system is critical. The NOSzels use a -4 A Instantly spraying 300-plus-hp worth of nitrous is hard on the engine's bottom end. We prefer to use NOS's Progressive Nitrous Controller and gradually bring the system up to full power in about 1.5 seconds. To the left you can see the Commander 950 ECU for the Holley MPI fuel injection system. Instantly spraying 300-plus-hp worth of nitrous is hard on the engine's bottom end. We pre Coolest Squeezin' RatThis engine really did kick! Not only was it rock reliable, it still purred like a kitten even after making almost 950 hp on squeeze! The plugs looked fine, although a bit on the rich side, but that's how most nitrous systems are set up to run, and there's still not a drop of oil leaking out anywhere. The Coolest Rat made so much power and worked so well that it would be equally at home in a 4x4, tow-rig, Pro Touring/g-Machine, or any street/strip play toy! Once we hooked the system up and started squeezin', the fun really began! It's so cool to be able to make so much power this easily. And as long as you're careful with your tune up and always use the proper fuel for the amount of nitrous you're spraying, there's little chance of a mishap. Check out the huge jump in power with just the 100hp setting. Then compare that to the 300hp setting! Any street engine that can max almost 1,050 lb-ft of torque is a force to be reckoned with! Note: We started all nitrous pulls at 3,500 rpm to keep from possibly damaging the engine. Click here for the big-block Chevy nitrous system dyno chart SOURCES Accufab 1516 E. Francis St. Ontario CA 91761 909-930-1751 www.accufabracing.com Product Engineering 528 N. Marine Ave. Wilmington CA 90744 Dept. SC Holley Performance Products 1801 Russellville Rd. Bowling Green, KY 42101 KY 42101 270-782-2900 www.holley.com VP Racing Fuels 210-635-7744 www.vpracingfuels.com Nitrous Oxide Systems (NOS) 2970 Airway Ave. Costa Mesa CA 92626 Vrbancic Brothers Racing 1463 E. Philadelphia Ontario CA 91761 909-930-9980 « | 1 | 2 | 3 | View Full Article Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!