On went the new head gaskets secured by ARP head studs, followed by a Kenne Bell 3.6L supercharger. Designed for a 2012 Camaro, the Kenne Bell supercharger featured a dedicated air-to-water intercooler, massive single-blade throttle body, and 4.5-inch air intake system. Also present to ensure uninterrupted airflow to the supercharger was the Kenne Bell Mammoth intake manifold. Supercharger systems are only as efficient as the airflow going to them. Recognizing the fact that airflow restrictions to the blower equate to reduced flow and boost out of the motor, the gang at Kenne Bell took all the necessary steps to maximize airflow through the induction system.
Due to available dyno time, we did not have the opportunity to test the 418 in NA trim after reducing the static compression ratio. In previous testing, we know that every point of compression was worth 3-4 percent in power, so 6/10ths of a point could drop power by roughly 2.5 percent, or around 15-16 hp. Since the Kenne Bell supercharger also eliminated the factory long-runner intake, the comparison between NA and supercharged power was less direct anyway.
What we do know is that as much as LS engines love boost, modified LS3-based strokers love it even more. It does, however, bear mentioning that the key to a successful supercharged motor is starting with a healthy normally aspirated combination. With our stroker pumping out over 600 hp in normally aspirated trim, we were already well on the way to reaching our self-imposed goal of 1,000 hp.
Testing the supercharger kit from Kenne Bell required installation of the factory accessories. The blower shared the same belt as the accessory drive, and required the components for proper belt orientation and tension. Obviously it was necessary to augment the fuel system to feed the supercharged stroker. Normally the kit comes with 47-pound injectors when run at 9 psi on the stock motor, but we stepped up to 75-pounders combined with 60 psi of static fuel pressure and a boost-referenced fuel pressure regulator. Aeromotive supplied both an A1000 pump and adjustable fuel pressure regulator for our testing, so we had no concerns about fuel delivery.
9 All testing was run through a set of 1- 7/8-inch American Racing Headers pipes.
10 Tuning was provided by a Holley Dominator EFI system while fuel came courtesy of an Ae
11 Run in normally-aspirated trim, the Mast-headed, Texas Speed stroker produced impressi
Tuning was provided by a Holley Dominator EFI system, while exhaust chores were handled by a set of 1-7/8-inch headers from American Racing Headers. Initially the boost was set at just over 10 psi and run on pump gas. Putting a maximum of 10.75 psi of boost to Monster Mouse on pump fuel resulted in 883 hp at 6,700 rpm, and 769 lb-ft of torque at 5,100 rpm. True to form for a positive displacement supercharger, torque production was impressive, exceeding 700 lb-ft from 3,500 to 6,500 rpm.
We added a mixture of Rocket Brand race fuel to the mix before cranking up the boost, then increased the pressure to a maximum of 13.5 psi. Monster Mouse responded with a jump in power to 951 hp at 6,500 rpm and 866 lb-ft of torque. Being ever so close to our goal of 1,000 hp, we turned up the boost one more time to 18.7 psi. The supercharged stroker pumped out 1,051 hp at 6,600 rpm and 988 lb-ft of torque.
We can't help but suspect this is about the reasonable limit for the 8-rib serpentine system, though race applications have run successfully at higher boost and power levels. The most impressive thing about this exercise with Monster Mouse was how easy it was to make 1,000 hp. Time was when 1,000 hp was the holy grail of power outputs, even for a big-block. This thing could be driven around on a daily basis at a reduced boost level, and then with a pulley swap and race fuel, transformed into a serious track animal.
An argument can be made about just how necessary 1,000 hp is in a street car (or many racecars!), but the fact remains that combining a big-bore Texas Speed stroker LS with big Kenne Bell boost can yield four-digit power levels. Stick around--we aren't done with Monster Mouse just yet.
12 To lower the static compression, we removed the Mast heads and replaced the 0.041 gask
13 The reason for the drop in compression was a Kenne Bell liquid-cooled 3.6L supercharge
14 The Kenne Bell supercharger system for the 2012 Camaro features an integrated air-to-w
15 This standard system for the Camaro included 47-lb injectors, but we upgraded to a set
16 Wanting to maximize airflow to the 3.6L supercharger, we opted for the massive single-
17 The guys at Kenne Bell designed the Camaro kit with a 4.5-inch air intake system. Why
18 In previous testing with Monster Mouse, including our normally aspirated test, we reli
19 Boost supplied by the blower was a function of the blower speed relative to the engine
20 Run at 10.75 psi, the supercharged stroker produced 883 hp, while 13.5 psi brought 951
21 [Monster Mouse 418-NA vs Kenne Bell (10.75 psi)] Upgrading Monster Mouse with a set of
22 [Monster Mouse 418-NA vs Kenne Bell (13.50 psi)] Stepping up to 13.5 psi and a race-fu
23 [Monster Mouse 418-NA vs Kenne Bell (18.80 psi)] The final test increased the boost to
330 NW Stalling Drive
Texas Speed & Performance
329 East HWY 62/82
1801 Russellville Road
7805 Barton Street
10743 Bell Ct.
1830 Holsonback Drive