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Originally Posted by rcolt75
Just wanted to see if anybody has beefed up a cavalier yet and gotten some real hp out of it. I have 2003 2 door and i'm thinking about either turbo charging it or supercharging it and doing some major internal work to it plus upgrading the brakes and possibly puttings some 18 or 19 inch wheels on it. My cavalier has about 145hp right now, i was just wondering if anybody was up close to 300 or maybe more.
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Unfortunately most people are going for looks, spending all of the money on bodykits etc. If you put larger brakes (although they will be needed with that kind of grunt) and 18s or 19s you will lose some of the power. Is this all for the street or are you planning to Autocross it? You haven't said what motor ou have but I would say 300 is possible. It may not be 100% reliable though. If you have a 2.2 then you would probably need to port and polish the head, fit harder valve springs and say Stainless steel Valves, Some Lower compression pystons and forged rods possibly oversized just for a little more displacement. I'm not sure how tha crank would hold out but would probably be worth investing in a Nitrided unit. You would need the exhaust manifold and intake. a mediun sized turbo a boost controller and a good Blow Off Valve and not just for the sound.
Check
http://www.importperformanceparts.net/ for their Turbo Kit It can run up to 18 pounds of boost with the Garret T28BB upgrade. A large Turbo which will give a fair amount of 'lag'. Although you will need to run this kind of boost or most probably higher for 300hp Or their Kit with the T25BB, a slightly smaller unit that they claim will give 280hp without further improvements so 300hp should be possible with this kit, Usually the T28 is used by Rally teams but they have sofisticated Anti-lag systems that greatly reduce the life of the turbo. These work by controlling the ignition. When the driver eases off the throttle pedal instead of the throttle butterfly closing completely it remains open meaning that air is still entering and exiting the engine and the ignition cut the spark so that the power output is lowered to simulate lower revs, this keeps the Turbo spooled up and then when you hit the throttle pedal again the boost is there waiting for you and then instant power with no lag. What this does though is cause unburnt fuel to enter the exhaust and this results in flames being spouted from the tailpipe with a bang or pop. You would also need some kind of LSD as this much power through the front wheels without one will just mean that you don't go anywhere and just go through tiresa set a week!!!
Good Luck though $$$$$$!!!!!!! Would forecast near $10,000 in engine mods when you're done (tax & hidden costs included)