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Originally Posted by rallimike
As I understand it, WI lowers combustion temperatures, and, I assume, exhaust gas temperatures. Forgive my ignorance, but wouldn't that mean that the turbo will spool more slowly? Wouldn't both the velocity and volume of the exhaust gases be decreased? Conversly, would WI increase the efficiency of a turbo with a smallish hotside?
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I firmly believe that water injection should only be activated when the combustion temperature becomes destructive. Injecting water when your engine is running at an acceptable combustion temperature (refected by the egt ), will loose power and slow down spooling time for sure.
If there are excess heat available (high combustion temperature), the gaseous water will accelerating the spool up time for sure. I am really having problem explaining this.
Ideally you want plenty of hot gas out of the exhaust without the extreme temperature to make up the volume.