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you can make up to 400 whp on stock internals with the proper tuning. Tuning is everything. A ka24de i would expect the maximum to be around the 320 whp mark. ALl you need to do to an sr20det is fuel injectors, t3/t4 turbo, adapter flange for stock manifold, s-afc, or retuned ecu. and z32 mafs. Heavy throttle sells the z32 mafs with injectors and ecu upgrade kit for sr for 575. Plus a turbo, like 650, flange 10 bucks, hone the intake manifold and smooth out the irreqularities where it meets the flange , like 20 bucks at a machine shop. so like 1800 + 1225 = 350 whp with the proprer tuning.
A ka would need heat treated rods, plus pistons for a total of 600 + what i above mentioned for the sr, for around 600 + the turbo and manifold around 800, hopefully youll be doing the labor yourself, also cams. Youll also need a metal headgasket. As long as the sr is tuned properly you dont even need to swap the head gasket, just run better fuel at high boost. so for about 2400 you can have a similar set up making about 350 whp, but you need to remeber all the labor of acutally building the motor properly unless your going to do it yourself and god help you if you are an amatuer. so you could theoretically do it for cheaper if you did all the labor yourslef for the internals, otherwise the ka24det will end up more expensive, the sr20det modifications are all external, basically just bolting stuff on and tuning the fuel map.
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