Join Date: Dec 1999
Location: Griffin, GA USA
In terms of reliability of the unit, it seems to me that a S/C can hold up longer. Consider engine shutdown. You turn off the key and 2 things happen, your engine stops running, and your oil stops flowing.
For a S/C, when you shut off your engine, the S/C also stops. However, a Turbo is spinning due to exhaust flow, so even though your engine and oil stop, the turbo will continue to spin for a while. But without fresh oil flowing, the bearings can cook.
Some people with Turbos, let the engine idle for a minute or two while the turbo slows down. The fastest way to ruin a turbo is to rev the engine (causing the turbo to spin up), then shut off the engine. This will cause the residual oil on the turbo bearings to "coke".
To increase the reliability, some people use a sump which is higher than the turbo, which will drip oil for several minutes after shutdown. Another approach I have seen is an electric pump with a time delay, which will run for x minutes after shutdown to pump oil over the bearings.
So unless you have one of these 2 post shutdown oiler arrangements, common sense tells me that a S/C should be more reliabable (everything else being equal), IMO.
03 Cobra Coupe DSG
“You don’t need the bullet when you got the ballot.” ~George Clinton