| Dortiz |
11-17-2013 12:52 AM |
the wastegated setup will spool quicker and build more boost. However, a non wastegated turbo will have a larger turbine, and thus less exhaust backpressure at a given flow rate. Some people suggest this makes a nonwastegated unit better for towing due to lesser backpressure.If you have the option between a wastegated kit and a Non-wastegated kit then go for the wastegated. You will build boost sooner and have more response. The wastegate allows the use of a smaller exhaust housing that can be spooled quicker and when the desired boost level is reached the wastegate opens to prevent overboost/turbo overspeed. If you choose a non-wastegated setup, then you have to pick a turbo that your engine can't over speed and will only make your desired boost at full load full Rpm, so it will be harder to spool than a wastegated turbo.
A "smaller" turbo will spool up more quickly (minimized "turbo lag") and offer better driveability in most cases. It will not generally, flow enough air at peak engine speeds to make big power. You'll make smoke, elevate the EGTs and risk the turbo. You will NEED a wastegate on the "smaller" to prevent turbo overspeed under load.
A "larger" turbo will spool more gradually (have noticable lag) and offer better performance under high engine loads because it can move relatively more air. This will keep EGTs low for a long happy life if fuel is reasonable. The "larger" turbo can get by without a WG IF chosen carefully.
Also as far as the intercooled idi , I can't really think of a disadvantage to it other then overheating of the oil in the turbo due to a faulty part, but rarely happens that I'm aware of haha, more or less it happens to the mini coopers where the oil burns up in the turbo due to the distance between the headers and turbo itself most only last 35,000 :ouch: (ask me how I know)
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