Supercharger Performance and Engine Performance Parts

This is a great article by muscle mustangs and fast fords. A lot of turbocharger and supercharger enthusiasts think that a certain supercharger or turbocharger will produce X hp per psi and that the only way to get more power per psi is to change up to a more efficient supercharger or turbocharger.

This article here takes three related engines, a 4.6 3 OHV VVT mustang engine, a 4.6 4 OHV engine, and a 5.4L 4 OHV engine and subjects all three to 20 psi of boost from the same blower. As we would expect: engine efficiency, head design, and displacement all have a final result on final power and torque figures showing that psi is truly nothing but a measure of engine restriction relative to supercharger flow capacity.
 

Kenne Bell 2.8L on a GT500

As long as the supercharger can support more flow for the same PSI on its compressor map, and so long as the supercharger has not yet been geared to its maximum rpm you can always produce more horsepower at the same PSI level by improving the motor’s flow and making it breathe more (with heads, cams, displacement, variable valve timing, compression ratio and more). Once you’ve increased the engine’s flow capacity you will find yourself watching the PSI DROP and power increase as a result of the increased CFM. After that you can re-gear the supercharger drive pulley system to get back to your original boost pressure and achieve even more horsepower at the same PSI. The Kenn Bell kit uses a 2.8 liter positive displacement superchager and an integrated intake manifold and air to water intercooler, replacing the smaller and less effecient eaton unit that comes stock in the GT-500 and upgrading on the normally aspirated power of the 4.6 L Mustang GT and Mustang Cobra. 

Here’s a taste of the results from a similarly equipped car

Find the full article here:

Supercharger Shootout -- Brothers In Arms

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