Feeding the thirsty injectors was an Aeromotive A1000 fuel pump, 13110 Pro-Series EFI regulator, and 12301 fuel filter. A quality fuel system on a high-horsepower nitrous motor is a must. The motor was run in anger to the tune of 544 hp at 5,900 rpm, and 514 lb-ft of torque at 4,800 rpm. Torque production exceeded 480 lb-ft from 4,000 rpm to 5,900 rpm. Obviously the long-runner LSXRT intake, 281LR cam, and CNC-ported heads were all working well together. Even down at 3,000 rpm, the 383 stroker produced over 450 lb-ft of torque. Such is the benefit of the additional displacement compared to a typical 5.3L. Now it was time to hit the nitrous.
Preparation of the nitrous test included installation of the proper fuel and nitrous jetting (28/52), retarding the timing by four degrees using the XFI management system and heating the bottle until the internal pressure registered 900 psi. Once everything was set, we dropped the hammer once again, then engaged the nitrous. The motor got real happy, and power jumped to 660 hp and 655 lb-ft of torque. The 100hp shot increased power output by 116 hp and 141 lb-ft of torque.
Since the system is adjustable, we decided another shot was in order and stepped up to 150hp jetting (32/64). The timing was retarded another two degrees (total of six) as we once again engaged the nitrous at wide-open throttle. As before, the Zex Perimeter Plate system offered impressive power gains, jumping peak power to 706 hp at 5,700 rpm, and 737 lb-ft of torque at 4,700 rpm. Thanks to the Perimeter Plate system from Zex, Modern Mouse was pumping out some serious power, capable of pushing a fourth-gen Camaro or LS-swap muscle car easily into the 10s, and perhaps even into the 9s.
6 The exhaust ports were given the CNC treatment as well. Note this included modification
7 The dedicated castings feature 2.055/1.60 stainless steel valves and CNC-profiled 64cc
8 Naturally the heads received something other than factory valve springs. The dual-sprin
NA vs Zex Perimeter Plate (100hp Shot)
How do you not marvel at the power gains offered by nitrous oxide? Is it any wonder so many racers use the stuff? Just push a button and you are instantly rewarded with massive power gains. Who couldn't use an extra 100 hp in their street car? Sporting the CNC heads from Procomp Electronics, a Comp cam and LSXRT intake, Monster Mouse pumped out 544 hp and 514 lb-ft of torque. After installation of the Zex Perimeter Plate system, the peak power numbers jumped to 660 hp and 655 lb-ft of torque. These power gains were achieved using 100hp jetting. It is important to note that the Zex nitrous system was designed to run at the factory fuel pressure (58 psi). More pressure will richen up the mixture while less will lean things out. Our Aeromotive fuel system included an adjustable fuel pressure regulator that allowed us to dial in the desired fuel pressure.
NA vs Zex Perimeter Plate (150hp Shot)
As happy as we were with the results of the first test, the adjustability of the system was just too tempting. Stepping up from the 100hp jetting to the 150hp shot, we once again applied the Zex Perimeter Plate system to Modern Mouse. The little stroker that could responded with even more power, jumping to 706 hp and 737 lb-ft of torque.
9 To mix things up a bit, we chose the LSXRT intake over the LSXR version. The intake was
10 Aeromotive supplied an A1000 fuel pump along with an adjustable fuel pressure regulato
11 To establish a baseline for the nitrous test, we ran the combination in normally aspir
12 After running the motor in normally aspirated trim, we installed the Zex Perimeter Pla
13 The plate was labeled for proper orientation. The last thing you want is to have the n
14 The Perimeter Plate system utilized jetting to adjust the power output. We chose 100hp
15 We chose to mount the fuel and nitrous solenoids on the intake. Note the black braided
16 Run in anger with 100hp jetting, the Zex Perimeter Plate system increased the power ou
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