Porsche 928 The Porsche 928 was made from 1978 to 1995, during which time it was Porsche's most expensive model.

1987 928s4 Performance parts estimate

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Old 08-08-2009, 04:53 AM
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Default 1987 928s4 Performance parts estimate

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Old 08-09-2009, 12:28 PM
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All those parts will add a lot of power. How much really depends on if they are all compatible, does the cam kit match the needs of the boost you might add and the boost make enough for the stroker and are the valves the right size for the whole combination?, and is there a performance bottleneck (cat converters?, exhaust) somewhere else? 15 lbs of boost and the right parts and you might get from about 280 HP to the wheels stock to around 450-480. Or you might have only about 380 if the parts don;t work well together.

But I wouldn't do it. First, yours is a 22 year old car, and it is frankly a good deal of effort to keep one in tip-top shape. Second, all those driveline parts were built for 320-350 HP - which was what they could handle when new: add this much power and you are basically going to tear it up quickly. Third, 15 pounds of boost will probably tear the bottom engine of the engine apart (slowly unless you abuse it, but surely) even if you do a rebuild, etc. Finally, this was a great car as built, and there is tremendous joy in just retoring and enjoying one that is, essentially, new looking. Here, you will just create an unbalanced freak, and unless you have a lot of money, one that is never running well or completely to your satsifaction.
 
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