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Old 12-25-2005, 05:40 PM   #26
BigJ04STi
Scooby Specialist
 
Member#: 77239
Join Date: Dec 2004
Chapter/Region: Tri-State
Location: A Town
Vehicle:
2004 Impreza WRX
None

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There's no way to weigh the actual weakness of the stock piston or the stock piston design...

For 1, we only only know which casting method they used and nothing else. We do not know any one the quality control info, on what poercentage of pistons would be expected to fail prematurely due to any number of external or internal related issues...

Also...

We have no control group of pistons or STi engines to compare 1 to another...no one uses the same fuel, lives in the exact environmental conditions (including weather, temp, humidity, etc), same elevation, etc...Also driving methods and distances can cause issues...care of the car can effect things also. Plus there's also tuning and other parts involved here...

We will never know a true number or percentage of failures in STi pistons...

This being said... Using better fuel, keeping tunes mild, not going for excessive boost amounts, or pushing the car at WOT 24/7, along with good car care should allow the pistons to last for their full life.

This all being said...just don't be stupid with your car...and you should be ok. Unless you got the set of pistons that were in the percentage group of premature failure due to manufacturing defects...in that case, there's nothing you can do...

Good write up...it's a solid place for people to begin.
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