810 HP/745 FT/LB KENNE BELL BIG BORE 2.8H SHELBY GT 500 KIT
On November 9th Kenne Bell made history. Our new 2.8H("H" for 2.0 high pressure ratio) Big Bore Twin Screw kit recorded an incredible 810 hp and 745 ft/lbs(SAE corrected). Our Earl's Automotive test car was 100% stock except for cooler plugs, a Kenne Bell boost-a-pump and optional throttle body and inlet system. That's with a stock fuel system (lines, rails, pumps and injectors) through stock cats and exhaust. No headers, cams, nitrous
etc., only the 2.8H kit. All with an ultra efficient, compact and lightweight 2L series Twin Screw. The supercharger itself is so efficient that bolting on the big discplacement 2.8H with the same size stock 3" pulley increased power by 125hp(606 vs 481) over the Eaton 122 (2.0L). Same pulley size - same tune. Only a kit change with 100% stock car. The kits HP range is 568 - 810. Preliminary tests indicate it can make 725 hp on pump gas at 16 psi. The new supercharger is so efficient that 1 psi of boost is 25 hp. Remember the "H" series requires less engine HP to drive, By upgrading pulleys(12-20 psi) and optional inlet components(throttle body and cool air kit) there's plenty of room to grow.
Preliminary testing indicates the Shelby makes 725HP on pump gas at only 16 psi and 810 hp at 19 psi. The unusually high HP output is possible because of the 2.8 H's radical 2.0 internal pressure ratio. Other 2.2, 2.3 and 2.4 Twin Screws use a 1.4 built in internal pressure ratio. The new design Kenne Bell 2.8H consumes up to 40 less engine HP to drive, that means 40 more rear wheel HP at the SAME boost. Discharge air temps is also 30 degrees cooler at high boost levels. These two 2.8H features(less parasitic HP loss and lower air temps) are responsible for it's unusually high HP levels.
Equally important to the overall high effeciency of the kit is the cavernous high flow 1000 hp + inlet and a huge new Kenne Bell dual 75mm throttle body.Both were developed on our new 1000 hp flow bench.
Our goal was to engineer a flexible kit with a compact lightweight, highly efficient - low parasitic loss billet twin screw that would make all the HP 99% of our customers would ever need. 810 hp and 670 ft/lbs at only 2500 rpm is more than enough to exceed the design limits of the stock engine and drive train.
Literature and Tech Tips will be posted on our website on Dec. 15th. or sooner. Next we'll gut the cats and test headers, exhaust and cams on the dyno and drag strip. Earl will be doing all the driving. The "Shelby Tech Tips" will include everything we've learned about the car's fuel system, ignition, clutch, inlet system, calibration etc. along with 50 dyno tests from the stock 444hp / 428 ft/lbs to 810 hp / 745 ft/lbs.
We have 2 months of development time and over 500 dyno runs on the Shelby. It is the most exciting, efficient and insanely powerful production engine we've ever done a kit for. By comparison, our GT Supercar made 710hp with a 2.3 Lysholm and Kenne Bell HCD Drive Conversion with 2 1/2 pulley. The KB 2.8 H Shelby made 810 with the same 2 1/2 pulley, throttle body, tune etc.The heads, cams and CR are also the same for both engines, the Supercar even having a perceived power edge with it's exhaust and dry sump. Yet the KB 2.8H equipped Shelby developed another 100 hp (810 vs. 710). The 2.8H is definitely capable of pumping 800 + HP into these engine. Kits should be available Jan. 15, 2007 or hopefully sooner. Again, our kits are designed so yu can customize the desired HP by selecting the pulley, cool air kit and dual 75mm throttle body. Tuner kits are also available and no problems with the pulley to hood clearance at the lower boost/HP levels. 25 HP increments from 568 - 810 with a direct bolt on on upgrade kit and all stock engine components.
The first dyno graph is the KB 2.8H Shelby kit vs. Ford GT Lysholm 2.3 kit with same 2 1/2 pulleys, same timing, and same A/F ratio.
The second dyno graph is the same KB 2.8 Shelby kit vs. stock Shelby Eaton 122 with same 2 1/2 pulley, same timing, same A/F ratio.