Quote:
Originally Posted by teoman
I have one of those fsi engines (passat 2011 1.8 fsi).
How much extra fuel is injected? %1 - %10?
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Depends on the situation. Older engines run hella rich (down to the 10:1 range) when in boost.
The newer engines with direct fuel injection run close to stoich at a cruise... or if you have the stratified fuel injection, it's running extra lean, so no extra fuel is being injected to cool down the engine when you're out of the boost.
Under boost, you'll be in the 12:1 range, so probably around that ten percent more. But then, even with naturally aspirated engines, manufacturers tend to run the engines richer when under load for safety reasons. Even those with direct injection.