Huge potential. Choose your HP 658-801 & Boost 10-23 psi. Outpowers a 3.3.
Exclusive: Mammoth 168mm Manifold / Throttle Body. +68HP vs. wimpy stock 60mm.
New "BIG BORE™" Billet 2.8H.
2.8 Fits under stock Shelby hood.
3.6/4.2 requires engine lowering mounts, hood or engine lowering kit.

 

Kenne Bell factory tuned with OEM grade equipment. No expensive custom tuning by others is required or recommended unless adding headers etc. that require re-tuning. Includes Dual "POWER" & "SHOOT OUT" tune.

Note: All boost ratings above based on tests on Kenne Bell '07 Shelby through the stock exhaust system, cams, heads, etc.

Boost is “peak” data logger reading on our Dynojet Dyno measured after the intercooler. Actual boost will vary depending on 1. pulley size 2. inlet components and 3. engine rpm. See “BOOST RATINGS” below.

Headers, exhaust, cams and heads can also lower boost.

Bone stock Eaton 3” pulley 8.5 psi = 441HP.

HP numbers are SAE on Kenne Bell Dynojet.

We recommend Dynos that use the AFM1000, ETAS or Horiba AF ratio meters/sensors (oxygen sensors) with a bung - no    tailpipe sensors. See “Dyno Testing Variables.”

CAUTION: These kits were designed to produce maximum power and performance. BE CAREFUL. Traction is a problem. The driveshaft needs to be upgraded and a safety plate installed at higher power levels.

STAGE 3 KIT 2.8
OVERVIEW

The perfect technological match - Kenne Bell and the fabulous Ford 5.4 4V. Never have there been kits with so much HP potential and flexibility in choice and never has there been a Ford engine like the 5.4 4V. The Shelby 5.4 engineered cars are strong and durable because they were designed specifically for a supercharger. Best of all, the 5.4 4V has tremendous HP potential, given the Kenne Bell supercharger and inlet component upgrades. And it all fits under the stock Shelby hood.


We Replace the stock restrictive 60mm throttle body and inlet tube with the Kenne Bell Dual 75mm Throttle Body and Inlet Tube (+26-74HP depending on pulley size). +26HP (692 vs. 666) with the stock 3” pulley size. That’s almost 700HP at 15.5 psi. Then there are the smaller pulleys. 2-7/8” (728HP), 2-3/4” (764HP) and 2-1/2” (801HP) - all the HP the stock engine and drivetrain can handle. This is truly a “max” performance kit.

Also larger pulleys that lower kit power to as little as 627HP for those who want less HP. Overall HP range is 627-801 (+100-257HP) with NO other engine or fuel system mods except for the Kenne Bell DUAL BOOST-A-PUMP™ and a set of 1 heat range cooler plugs. See “Shelby Dyno Test Summary” for HP and TQ matrix and select the HP that best suits your needs.

WHY MORE HP WITH THE SAME BOOST/PULLEY?
We’ve published a lot of information on the Shelby, but the following HP examples will explain why we talk so much about inlet systems. If we’ve learned one thing in our 24 years of Ford Twin Screw kit design, it is KEEP INLET SYSTEM LOSSES TO A MINIMUM. Supercharger size, efficiency and even boost are secondary if the inlet system is undersized and cannot supply sufficient air flow to the supercharger. It acts as a restrictor plate. Like a 2bbl carburetor on a 500” engine. The supercharger must spin faster to make up for the inlet boost loss. It then uses MORE engine HP to make the same boost. Oops! Remember that inlet restrictions LOWER the atmospheric pressure into the supercharger - and the actual boost the engine therefore sees. It’s a lose-lose situation. Example: Here is why the Kenne Bell 75mm manifold, throttle body etc. are so important to the HP a supercharger develops.

DO I NEED UPGRADES?
Our kits were designed to leave no one hanging and wishing they could step up the power with some quick simple supercharger bolt ons. Note that any one poor flowing component can limit the flow of the other inlet parts anywhere in the chain. The mammoth sized Kenne Bell Dual 75mm “Mammothfold” flows more air than even the big 75mm throttle body. It blows away the competition. The engine makes more power because the supercharger uses less engine HP with a cooler air discharge temp.

THROTTLE BODY
For max performance above 725RWHP, the 168mm throttle body is recommended up to 1300RWHP.

DO KENNE BELL 2.8H SHELBY KITS COST MORE?
Except for our Authorized Kenne Bell Installers, the majority of parts dealers (speed shops, web vendors, and other retailers) typically do not “recommend” Kenne Bell superchargers. The reason is simple. THEY CAN’T BUY, SELL THEM AND MAKE A PROFIT. So they recommend what they CAN sell at a profit. We can’t really blame them, but it’s been our way of doing business since 1968 - and we’re still here, stronger than ever - selling factory direct to our customers or Installer/Dealers.

All Kenne Bell supercharger kits are designed, assembled, calibrated and tuned in house and then sold and serviced (tech support, repairs, warranty etc). factory direct. Selling factory direct to our customers and select Authorized Installers/Dealers eliminates the middleman (web retailer) profit enabling us to offer a better product for less money. And Kenne Bell kits are complete with the industry’s best Installation Instructions. Our kits are not “finished up” or cobbled together by some web vendor and custom tuned by yet another. There are no hidden extras, add ons, custom tuning, agendas etc. And they are 50 State Legal.

Compare the advantage of buying factory direct, the features, what’s included, and all that “room to grow” and you’ll see that a Kenne Bell kit offers far more but can actually cost less than the competition. And it makes more HP.


STANDARD EQUIPMENT INCLUDED IN KENNE BELL 2.8, 3.6 SHELBY GT 500 KITS

$______ “POWER” & “SHOOT OUT” (Street & Competition) Dual Calibration. Turn the key and it's ready to go.

$______ Kenne Bell Factory Direct Tech Support. Best Mustang tech people in industry.

$______ 1000HP fuel system (DUAL BOOST-A-PUMP™). More reliable / less heat than larger pumps.

$______ Pump voltage / fuel delivery / pressure regulated 100% accuracy with Dual BOOST-A-PUMP™.

$______ Mammoth dual 75mm inlet manifold.

$______ Dual 75mm throttle body (1880 cfm) + 74HP.

$______ Intergral meter.

$______ Billet (not cast) high rpm - high boost Twin Screw. Less heat soak from engine heat.

$______ Room to grow. TVS 2.3 Roots Style very limited on HP potential vs. KB 2.8 or 3.6 Twin Screw.

$______ Includes all gaskets.

$______ Includes instructions (some kits don't furnish instructions).

$______ 2.8 fits under stock hood. 3.6/4.2 require motor mounts and/ or hood..

2.8 5.4 ('07 - '12)
FORD / EATON TVS 2.3 vs KENNE BELL 2.8H KIT COMPARISON
The Eaton's (90, 112, TVS 2.3) all make or made "good power." So does a non supercharged engine make "good power." The Twin Screw, as always, simply makes "MORE" power." The Twin Screw costs more but look at all that HP potential and the capacity/boost difference (2.8L vs. 2.3L).The Kenne Bell 2.8H is the ideal upgrade for the Ford OEM Eaton TVS 2.3L. Engineered by Kenne Bell to be second to none. With the same size 3” pulley, the larger more efficient 2.8H Kit pumps more air, develops more boost and produces more HP and torque (+112HP / 61 FT LBS). And there’s room to grow with the 2.5” pulley - another 9 psi and 114HP (801 vs. 687). Both kits were tested at the same optimum tune (24° and 11.5 AF). To guarantee accuracy, only the kit was compared on our Super Snake test car.

Unquestionably, the new 605HP Ford (Eaton TVS 2.3L) kit is superior to the 500HP ‘07 Shelby (Eaton 2.1L) kit or the 550HP ‘08 KR (Eaton 2.1L) kit - but the Kenne Bell also keeps improving in efficiency. The Eaton TVS 2.3L is available on the lower HP 605HP version of the Shelby “Super Snake.” The Kenne Bell high HP 2.8H Kit, which is also available on the “Super Snake” is rated at 725HP WITH ROOM TO GROW! The TVS is used up at 14.5 psi. Statements about how “efficient” a new supercharger is can be misleading. The real test of a supercharger kits output and potential is to simply compare both with 1. the same size pulleys and 2. with the smallest pulley on a dyno and then datalog the numbers. Below are 3” and 2.5” comparisons.

SUPERCHARGER – INLET MANIFOLD DESIGN & HP POTENTIAL (ONE PIECE vs TWO PIECE) Any superchargers potential is ALWAYS limited by the inlet system. If the inlet manifold is too small, it becomes the restriction to higher HP. Imagine an engine block and inlet manifold cast as a “one piece” casting that cannot be separated. An intergral supercharger – inlet manifold casting is used by the OEM because it costs less to manufacture. Unfortunately, the manifold cannot be replaced or upgraded for a larger throttle body, etc. and “porting” results in minimal, if any, gains. So if it is too small for your HP requirments, you are stuck as both the manifold and supercharger are too small. Kenne Bell billet superchargers and cast inlet manifolds are independent of each other and larger than the competition. They may cost more, but larger manifolds coupled to larger and/or more efficient superchargers means more HP for your dollar up front – and more room to grow.

THROTTLE BODY SIZE
The Kenne Bell Mammoth Manifolds (Ford, Dodge & Camaro) incorporate a huge 79mm x 168mm opening to accommodate the huge Dual 75mm (1880 CFM) or Mammoth Big Oval (2150 – 2350 CFM) Throttle bodies. A big HP throttle body doesn’t work very well on an “undersized” supercharger inlet manifold.

Click here for Mammoth System Tech

Click here for engine vs. chassis dyno tests & HP ratings

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STOCK VS. KB DUAL 75MM THROTTLE BODY

SAME KIT USED ON 750HP SHELBY SUPER SNAKE
Fits under stock hood*. *Notch on X brace required. No new hood or "Body Lift-Engine Lowering Kit" required.
Most flexible kit design. Easy to “step up” for racing or “dial down” for street with easy pulley change or Kenne Bell   bolt ons.
Largest 168mm Manifold for most HP, lowest parasitic losses and coolest air charge.
Standard “Mammoth” 168mm Inlet Manifold accepts exclusive Kenne Bell Dual 75mm or 168mm Mammoth 2150 and   2350   Throttle Bodies.
Kenne Bell designed Dual 75mm Throttle Body (+26-74HP low restriction meter/filter (48-63HP). Eliminates “mixing   and matching” parts from others. 168mm is up to 40 more at higher HP levels.
BIG BORE™ 2.8H (2.0 PR).
Billet anodized or polished case vs. painted cast aluminum.
+125HP (606 vs. 481) over stock Eaton 122. Same 3” pulley and tune.
+138HP (655 vs. 517) over stock Eaton 122. Same 2.6” pulley and tune.
+ 357HP over stock (801 vs. 444). Stage 3 Kit 2.5” vs. stock Shelby 3”.
Kenne Bell Flash Tuner included with each kit.
Exclusive Kenne Bell Dual BOOST-A-PUMP™ included with all kits. Larger pumps, fuel rails, lines etc. not required up   to   1000HP.
Smog Legal. EGR etc. not removed.
Tested by Muscle Mustangs & Fast Fords and 5.0 Mustang Magazine.
Quick easy install.
Complete kit. No cobbling together a grab bag of parts and then paying a tuner to make it all work.

2.8 5.4 ('07 - '12)

The secret to the Kenne Bell kit’s superior performance is the exclusive mammoth sized 168mm x 79mm Inlet Manifold, Inlet system and matching Dual 75mm or 168mm Throttle Body. No other kit has it. Supercharger size and efficiency are meaningless if even ONE inlet system component is restrictive or undersized. That’s the best way to kill HP and efficiency (boost, temp and parasitic loss) with ANY positive displacement supercharger i.e. makes it work harder. So, at what HP level does the little stock 60mm throttle body begin starving a supercharged Shelby and killing off HP? One look at our back to back - one change at a time Kenne Bell Shelby dyno tests tells us the answer is approx. 435HP, the average for a STOCK Shelby. So don’t buy a larger throttle body for any Shelby supercharger that only makes 435RWHP @ 6200. At a mere 435HP, the 60mm begins to show it’s limitations. Then at 6300 rpm, the 75mm pulls away by 26HP (658 vs. 632)! And in the 700HP range, the highly restrictive stock 60mm is choking the supercharger off even more by up to 74HP. Note the higher the HP/air flow, the greater the power gains from larger inlet components. Again, ANY positive displacement supercharger responds especially well to a SERIES of larger inlet components (throttle body, hose, meter, filter). If ONE is restrictive, it chokes off the air flow to ALL of the others, including the supercharger. Anyone who doubts that Kenne Bell 75mm components are a must need only ask Ford engineers why they used a 70mm on the Ford GT Supercar - an engine that makes up to 100HP LESS than a Kenne Bell Shelby.

Note: For ultra high HP competition applications use the KB 168mm 2150 - 2350 Throttle Body.

Our flow bench and dyno testing indicated the Kenne Bell 2.8L was capable of inhaling a lot of air - up to 1200HP. So we designed a huge oval shaped inlet system with a Big Oval 130mm Meter and Filter that measures 130mm and flows 1830 cfm. It feeds our own Dual 75mm Throttle Body and matching Inlet Manifold through an equally oversize Inlet Tube.

Designed for the Shelby GT 500, ’05 up Mustang GT, ’03 Cobra & Hemi. Mammoth Kits. Rated up to 800RWHP/940EHP. Stock 60MM and other replacement 62-66MM throttle bodies are too small and lack sufficient air flow for higher HP applications.

Note:
Must be used with Mammoth inlet. Note: Smaller filter, meter, inlet pipe & manifold will restrict air flow and limit HP potential of the throttle body. Recommended for Mammoth manifolds only.

 

line

Rated 800RWHP/940EHP
+ 48-84RWHP vs Stock 60MM
+ 24RWHP vs 66MM
Matches Mammoth Manifold Opening (79MM x 168MM)
Special Tuning Required
Mirror Polished Billet Aluminum
Available DBW or Manual Throttle

+15HP @ 700RWHP and
Recommended for any application over 700RWHP
+15HP @ 700 and +50HP @ 835RWHP

*BOOST LEVELS 18 PSI AND HIGHER WILL REQUIRE HIGHER OCTANE FUEL. 18-23 PSI FOR COMPETITION USE ONLY.
MAXIMUM RECOMMENDED SUPERCHARGER RPM = 18000. MAXIMUM RECOMMENDED STREET BOOST IS 18 PSI.
3” PULLEY IS MAX FOR STREET AND PUMP GAS (93-94 OCTANE). 3-1/4" IS STANDARD PULLEY.
2-1/2”, 2-3/4”, 2-7/8” ARE COMPETITION ONLY - RACE FUEL PULLEYS.

Read what Technical Editor, Tom Wilson, has to say about dyno testing and driving the new Kenne Bell 2.8H 800HP Shelby Kit.
Cover Car: March '07 issue 5.0 Mustang Magazine

"Click here for article"

 

"Click here for '13 Shelby GT500 Tech & Tuning Tips, Comparisons, Dyno, Boost, HP"