Moderators: Greenleaf, KTA, BC847, Richie O
rbrettctd wrote:How does that work??? Advancing timing drops the boost right?
BC847 wrote:In my earlier post, by injecting the fuel earlier (by advancing the timing), more heat released by the burning fuel is converted to actual work by way of the increased cylinder pressure pushing on the piston.
With that, there's less heat in those gasses shoved out the exhaust valve to spin the turbo.
As such, you've made the engine more efficient in converting fuel to work directly at the crankshaft.
The turbo primarily get it's driving power from those exhaust gasses fed into it, that are still expanding. That point is clearly seen in the typical 300*F or so EGT drop across the turbine (1000*F pre-turbo / 700*F post-turbo for example). That 300*F temperature drop represents the thermal energy being converted to mechanical energy.
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