Revision [63]
This is an old revision of Forced-Induction made by Atomic0utlaw on 2023-07-26 17:47:38.
A supercharger (or 'blower') is a gas compressor that forces more air into the combustion chamber(s) of an internal combustion engine than is achievable with ambient atmospheric pressure (as seen in a naturally-aspirated engine, see forced induction). The higher mass flow rate together with an increased heat input provided by additional fuel combining with the greater mass of atmospheric oxygen available, increases the specific cycle work and hence power output of the engine.
A supercharger can be powered mechanically by belt, gear and shaft, or chain-drive from the engine's crankshaft.
Contents
1 Eaton MP45
1.1 Tuning
1.2 Pulley Changing
1.3 Methanol Injection
1.4 Porting & Polishing
2 Eaton MP62
3 Electric
Eaton MP45
The Eaton MP45 supercharger kit is the only bolt-on kit currently available for the 2.4L Twin Cam. Add 50 horsepower and 40 ft-lbs of torque with the stock pulley. Designed for 2000-2002 GM vehicles with 2.4L Twin Cam engine, however also can work on the 1999. (How-To: Use MP45 on 1999 Alero)
Kit includes: highly detailed instructions, all mounting brackets, intake manifold with integrated supercharger, adapters, 310cc injectors, serpentine belt, Gen II MAP sensor and 1-step colder spark plugs. Can be installed with normal hand tools in 6-8 hours by anyone with basic mechanical knowledge. Works on both manual and automatic transmissions. The MP45 flows 0.75L air/revolution.
The GM Performance Parts Supercharger (Part # 12498660) can be purchased at CrateEngineDepot and PacePerformance.
Tuning
Tuning is essential when you install the kit. Adding more air requires more fuel, so the kit includes 310cc fuel injectors, and a 2 bar MAP sensor (to read boost), however the stock computer tune does not know how to handle these additions.
In the installation manual is a page with configuration codes for manual and automatic N-bodies and J-bodies. Highlight the correct one for your vehicle and take the car and manual to a GM Performance Parts Dealership. They will have to call Techline and get a calibration code to load a preconfigured tune into your VCM. Ensure the fuel tank is filled with 93 octane beforehand. In order to get your car there, ideally, you should tow it, however you can drive it by putting the stock 1 bar MAP sensor in and drive slowly to the dealership. You want to drive slow and out of boost since the car can't read or compensate for the added air yet. Be sure to let them know to install the 2 bar MAP sensor once the car's reflashed.
The reflash should only cost one hour of labor.
The reflash is an unlocked tune, so one can edit the values and properly tune for any other modifications with ease using HPTuners.
Pulley Changing
If you're looking to increase the amount of boost and power that the supercharger makes, the quickest way to do so is by changing the pulley on the supercharger shaft. Installing a smaller pulley will spin the supercharger faster, allowing you to reach previous boost levels quicker, and increase peak boost pressure.
The most widely available and best choice when choosing a smaller pulley option is a modular quick-change hub. This aluminum hub replaces your stock 2.8" press-on pulley. Modular pulleys are held onto the hub by 5 hex head bolts, so if you want to change the pulley to a smaller size in the future or switch back and forth between track and daily driving, all you have to do is remove the bolts and the modular pulley slides off, and the new one can slide on.
You can purchase modular pulleys, hubs, and the tool to remove the stock pulley and install the hub through Smoothflow (E-Mail them and ask for a 5-rib MP45 hub/pulley) and Pulley Boys.
How-To: Install Modular Pulley/Hub
General Estimates on Pulley Sizes and Boost Achieved
Size PSI
2.8"
4-6
2.7"
5-7
2.6"
7-9
2.5"
8-10
Methanol Injection
Intercooling is always a good idea with boost. Unfortunately with the integrated supercharger-manifold design of the MP45 kit, a physical air-to-air or air-to-water intercooler is not feasible. Instead, those with the kit choose to chemically intercool by spraying methanol.
Methanol suppresses detonation, so more power producing boost and timing can be utilized. Water, with its high latent heat of vaporization cools the intake charge and combustion. Methanol cools the charge and combustion but also acts like an extremely high octane fuel (as high as 120 octane) as well as adding more oxygen to combustion. Most with methanol injection utilized see an increase in boost pressure of 2-3 PSI, and methanol allows one to increase the boost even further from its detonation reducing abilities.
Popular universal kits are available from Snow Performance, Cooling Mist, and Devil's Own.
Porting & Polishing
Stiegemeier Porting has taken modifying Eaton superchargers to the next level, with nearly 2000 units completed to date. We can provide a 1 to 3 working day turn around. Do not be fooled by a cheap imitations. We are constantly testing and improving power output.
We disassemble your blower and inspect for common problems like:
Rotor/case wear
Front drive shaft alignment
Front drive coupler
Flaking and tip scoring
Bypass valve operation
Broken bolts and stripped threads
The blower case is then ported achieving the CORRECT balance of low pressure to high pressure. (Low pressure meaning the inlet side and High pressure meaning the exit side.) Careful attention is paid to ALL areas to achieve the highest airflow rates and still retain case rigidity. Designs are constantly being tested and updated to assure you the largest HP gains available GUARANTEED. All of our airflow test data was recorded using an SF 600 Superflow Flow bench. The rotors are profiled, blueprinted and timed to the case.
After porting all gasket surfaces are checked for flatness and machined if necessary. The machined parts are put through a three phase cleaning process. The last phase consisting of a high pressure 190 degree rotisserie wash. All superchargers are assembled with factory correct full synthetic grease and oil. All fasteners are torqued to spec. After final assembly the superchargers are spun at speed and checked with an amplified hearing system to ensure you of a perfect assembly. In addition all superchargers are cataloged, numbered and dated.
You can have your blower exterior show polished, internally improved, or both, at www.stiegemeier.com.
Eaton MP62
There is a community project floating around The J-Body Organization about fabricating an intake manifold and related accessories in order to utilize the Eaton MP62 supercharger from the Chevy Cobalt SS and Saturn Ion Redline on the 2.4L Twin Cam. Progress has been made by some, but it has been a long process of getting something able to be produced. Overkill Engineering Motorsports and Vulcan Turbo are the key players in designing a system. The MP62 flows 1L air/revolution, 0.25L more than the MP45, and is more efficient.
Electric
The "superchargers" that are powered by batteries or the 12v power your car produces are a complete waste of money. The tiny plastic electric fan that you stick into the intake or strap onto the end simply cannot push enough air to match what the engine pulls in naturally. Even the expensive Thomas Knight electric supercharger which does work, has a cost higher than the real, belt drive superchargers already available, and is powered by a bank of batteries in the trunk for a push button activation system. Real superchargers improve engine efficiency all the time and do not require recharged batteries all the time. The entire concept is simply impractical. For $2500, one can make a real, powerful turbocharger setup or obtain the GM Supercharger Kit for around $1600 and make power all the time.
