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Originally Posted by TcmaBoy
700 HP is not a "kit" job. You will have to take the car to a shop and have a custom build done, to include rebuilding the motor with new internals to support the power. It will also require some sort of fuel management with a good deal of dyno time to dial the motor in. This is not a bolt on job that can be done in your garage. At those power levels it will not make a good DD. Reliability and drivability will be issues. So, just what is your budget?
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This guy is speaking absolute truth. I've driven a single turbo Supra that dyno'd 497hp at the wheels, and it was a real handful. Lag was bad, and when it started spooling, it spooled HARD. I drove on some pretty curvy roads with it, and it was no fun. I'd brake hard into the corner, start getting on the gas as I was turning into the apexes, and the turbo still wasn't spooling by time I came out of each corner's exit. Once it did come on, I wasn't really concentrating on charging into the next corner as much as I was just flailing at the wheel in order to keep the tail end behind me. I can only imagine what 700hp would be like in a street driven car.
I also didn't notice that you stated 700 WHEEL horsepower. What would that be at the crank? Somewhere in the 800-900 hp range? A stock bottom end MIGHT put up with 700 at the crank with appropriate fuel, cooling, and probably some alcohol injection, but I really don't think 800 on a daily driven car is going to happen. I've heard of some owners claiming outrageous numbers on stock bottom ends, but their cars spend most of the time sitting in shows and making an occasional dyno pull. If you really plan on driving this car, you've gotta build the bottom end. Also, while the IDEA of having a 700hp street car sound awesome, I wonder if you'll really like the reality of it. Such cars often end up being an exercise in frustration.
Personally, I'd shoot for maybe 500 at the crank, or perhaps 600 max with an alternate tune to put me in a very streetable, low boost mode. I'd also concentrate on getting the head set up to move great CFMs at lower RPMs so you don't have to rely so much on big psi and high revs to make power.
One more thing... Considering the amount of money you would spend on this, and since you want a street car, are you SURE you don't want to consider a very nice used Porsche 911, NSX, or even a Viper?
Sorry for the long post... just some of my thoughts on a topic that I myself have been pondering for a long time.