A turbo timer allows the engine to continue to run, even after the ignition is turned off,
Another accessory that made it on several of our experts' lists was the turbo timer. This device automatically keeps the engine running, even if the key is turned off, to allow the turbo to cool before engine shut-off stops the flow of oil through the housing. If you don't properly cool a turbo before turning off the engine, the hot oil can coke, or solidify, around the turbo's bearings.
In the end, no matter what kind of engine upgrade or turbo accessory you've put on your car, "the whole turbo system is only as good as its weakest link," said Tanaka. "You won't see the engine's full potential unless the entire system-fuel, ignition, intercooler, intake, and so on-is optimized." There are lots of components that contribute to the overall performance of a car, not just a turbocharger. If any one of those pieces isn't up to the task, the most expensive or exotic turbo kit in the world won't get you where you want to be.
Used Car Buying Tips
Let's face it: There aren't that many turbocharged cars coming from the factory any more. So if you're looking for a ride with a turbo as original equipment, you're probably going to have to buy one second- or even third-hand. How do you avoid buying junk?
Here are a few tips:
·Stay away from high-mileage cars. Ditto cars that have already been heavily modified, so you don't have to worry about the quality of someone else's work.
·Check for oil leaks from the turbo. If you see blue exhaust smoke after the car has warmed up, chances are good there's a leak in the shaft seals. Another way to check: Disconnect the pipe from the compressor and wipe inside.
·Another oil tip: Since oil is the lifeblood of your engine (and especially the turbo), check the condition of the crankcase oil. If it looks dirty or needs replacing, it might be a sign that the previous owner didn't take good care of the car.
·Pull off the compressor's inlet pipe and check for foreign-object damage to the wheel's blades. This is especially important if the car's air filtration system has been removed.
·With the inlet pipe disconnected, reach in and spin the shaft. It should easily turn by hand. Pull back-and-forth and up-and-down on the shaft to make sure the bearings are still healthy. There should be minimal play.
·Some OE turbos are water- and oil-cooled. Check for signs of rust around the water fittings. If rust gets inside the housing, it can ruin the turbo internally.
·Any signs of overheating could spell potential turbo trouble. White hair-line cracks on the exhaust manifold are a giveaway that the engine has been run hot and lean.
·A leak-down and compression test will alert you to sealing problems between the head and engine block.
·Even well-cared-for turbos may need replacing if they have enough miles on them. Try to buy the car after the previous owner spent the bucks on a new turbo.
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