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Engineering/Technical Ask technical questions about cars. Do you know how a car engine works? |
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09-28-2007, 08:17 PM | #16 | |||
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Join Date: Sep 2007
Location: South Mississippi
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Re: Performance upgrades that don't lower fuel efficiency
Quote:
How much the throttle's open also really doesn't seem to matter much of anything with my car either, but I have 17" low pro rims on a Corolla. It's pretty crazy that no matter how much I drive in city vs hwy and how fast on the interstate I drive 70 to 95mph... I consistently get 26mpg with these rims. The only way I can get better than 26mpg ever is if I know where I'm going, haul ass and cut the car off way before I see a stop sign or a light that I'm familiar with it's timing or a long 2-lane road with a 90deg turn. Once I've gotten to the line or rounded the turn, I pop it in third and drop the clutch in to place so no damage is done to my starter. By doing this I've gotten ~31mpg, my only variation from the number 26. Quote:
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09-28-2007, 09:15 PM | #17 | |
Professional Ninja Killer
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Re: Performance upgrades that don't lower fuel efficiency
No... when an EFI engine is braking (when your foot is off the gas but still above idle) it injects zero fuel. When your foot is off the gas, the computer will inject enough fuel to maintain idle... which, if the engine is being spun faster, means it needs to inject no fuel.
If you push in the clutch or put it in neutral, it returns to idle where it begins injecting fuel again.
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