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Old 01-12-2011, 06:26 AM   #6
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Join Date: Oct 2010
Location: MI
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Also, turbo performance is much more dependent on ambient air temperature and charge air cooler performance. In high elevation, turbo engines perform better than NA (pressurized intake and low ambient air pressure).

On the bad side, turbo engines have more moving components means their long term reliability might not be as good as NA engines.
DI adds into that issue too; high pressure fuel injectors and high pressure fuel pumps with all those turbo complexity (e.g. BMW 3.0L turbo has all kinds of issue with high pressure fuel pump and DI injectors).
It also needs better cooling for turbo components (turbo blade and bearings), many manufacturers run coolant or oil to cool the turbo components. The charge air cooler dumps a lot of extra heat, this usually translate to higher under hood temperature (for cars with front engine) which is usually not good for components such as battery, alternator, belts, etc.
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