the 4g63t comes with 450's, which are good enough for about 15 lbs of boost. BUT, this is controlled by fuel maps in the 4g63t ecu. understand this, with ANY type of forced induction, you get heat. a LOT of the extra fuel needed at wot is for cooling. on a n/a motor, you do not have this demand for more fuel. once you cross the line into boost, the need for extra cooling rises dramatically. also, above certain levels, controlled by the tps, the ecu goes open loop, and runs off factory set fuel maps. if you are monitoring egt and a/f, you can see what it is doing, but the o2 sensor has no effect at this level. another thing you have to REALLY watch is knock and timing. for example, on my car, at part throttle, i can get as much as 40 deg timing, with 0 knock. go wot, and max timing drops to 23. bring in some knock, and timing drops off a lot. this is probably overkill, but it is better than no timing/knock control, and getting huge amounts of detonation. the factory dont want the cars blowing up under warranty. fuel control, like an afc would be needed. if your car stock has, lets say, 270cc injectors, and you use 450's, that is about a 65% increase, so at ALL speeds, your car will be running pig rich. however, because timing also needs to be addressed, if you could use the factory 4g63t ecu, that would be your best bet, otherwise, for best results, you are looking at a stand alone system, big bucks, and LOTS of tuning.
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