Originally Posted by bobdoo
Direct injection vaporizes fuel far more effectively than port injection, or carbs. That's one reason *why* auto mfrs use it.
I know my CX-5 dumps a lot of fuel at startup, to force the cat con to warm up faster. That contributes to fuel dilution.
The other big problem is the low-tension piston rings. They, again, contribute to MPG (in the fed testing regimen), but allow massive blow-by.
Improper break-in doesn't help. Those rings require high throttle bursts when the engine is new, to properly bed them to the cylinder wall.
My N/A CX5 did, too. My turbo CX5 seems much "better" tuned, though. The N/A CX5 ran PIG RICH for the first bit. Really tanked mpg and reeked like my old cammed up mustang GT with no cats.
Direct injection vaporizes fuel far more effectively than port injection, or carbs. That's one reason *why* auto mfrs use it.
I know my CX-5 dumps a lot of fuel at startup, to force the cat con to warm up faster. That contributes to fuel dilution.
The other big problem is the low-tension piston rings. They, again, contribute to MPG (in the fed testing regimen), but allow massive blow-by.
Improper break-in doesn't help. Those rings require high throttle bursts when the engine is new, to properly bed them to the cylinder wall.
My N/A CX5 did, too. My turbo CX5 seems much "better" tuned, though. The N/A CX5 ran PIG RICH for the first bit. Really tanked mpg and reeked like my old cammed up mustang GT with no cats.