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2004 Pontiac Grand Prix GTP Turbocharger Installation – 401 HP Out Of 231 Cubes

Since you can never have enough horsepower, I worked with my good friend, Kevin Margitta of Cartuning to replace the Eaton Gen IV M90 Supercharger on my 2004 Grand Prix Comp G with an intercooled turbocharger.  While Kevin had the hardware worked out, I contributed to the project by creating the software necessarily to reprogram the engine’s control module.  With the intercooled turbo & software updates in place, this swap easily put down 401 HP to the wheels before I decided I had enough fun at the dyno shop for the day.

A couple of months after the swap was complete, I ran into Don Keefe and asked him if he would like a ride in the car.  While he didn’t seem very interested at first, he became very interested after the boost kicked in!  Shortly thereafter, the following awesome article was published in High Performance Pontiac:

http://www.hotrod.com/how-to/engine/hppp-0603-2004-pontiac-grand-prix/

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Getting ready to make an 1/8th mile pass

 

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Engine Bay View Post Turbo Install

 

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Turbo Installation Closeup

 

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Supercharger Rotor Block-off Plate

 

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Another view of Turbo / Inlet piping

 

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Air-to-Air Intercooler

 

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Turbonetics Wastegate

 

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Cartuning Turbo Kit Display Model

 

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Stock Appearing Car