Describe difference between water-cooled turbocharger, air-air turbo intercooler, water-air turbo intercooler?
The new Porsche 911 Turbo has a "water-cooled turbocharger" (http://www.porsche.com). Does this mean it employs a water-to-air intercooler (really an aftercooler) on that turbocharger as opposed to an air-to-air intercooler, or is it something else?
Is this something new, or have all 911 turbochargers (or intercoolers) been "water-cooled" since the type 996 911 with its water-cooled engine was introduced?
We're getting close to a complete answer. The 996 & 997 Turbos are water cooled.
There are also oil-air intercoolers. What kind of intercoolers are used on 996 and 997 Porsche Turbos?
These answers are good. I should have said "996 and 997 turboCHARGERS are water cooled. I appreciate the descriptions of the parts of the system (I understand; I'm a mechanical engineer). The last part I'm trying to get: are the intercoolers air-to-air or water-to-air heat exchangers in the 996?
Porsche has used water cooled turbochargers since the 944 turbo (and most likely on the race track before that). Basically, the turbo is fed coolant from the same engine cooling system used to cool the rest of the car.
An intercooler is used to cool the incoming air prior to combustion. Most are air-to-air as the size and and added weight of a water-air does not make up for the efficiency gains (near zero anyhow).
The 944 turbo, 996 turbo, 996 GT2, and all 997 turbo variants have water cooled turbos. The water cooling allows them to be run reliably at elevated boost levels. Additionally, there is usually a pump to keep water running through the turbo after the car is shut down.
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