Posted by Hurst on October 09, 2011 at 17:15:31 from (76.124.110.245):
In Reply to: Turbo- How posted by farmer boy on October 09, 2011 at 16:20:03:
As you load the engine, more fuel is being injected, and the combustion of fuel is simply a chemical reaction turning those molecules in the fuel into gasses. Thus, more fuel equals more gas, which then means you have faster flow/more exhaust pressure driving the turbo exhaust turbine, which increases the flow of air further into the combustion chamber to support the added fuel. There's also wastegates and variable geometry turbo chargers that have mechanical parts that vary boost, but for a fixed turbo, like the ones seen on older tractors, it's simply controlled by the fuel being burned and the boost pressure that is being built by the turbo (so in a way, it is somewhat self feedback). Hope that makes some sense.
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