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Old 07-03-2010, 02:05 PM   #23 (permalink)
texanidiot25
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Join Date: Jul 2008
Location: Cypress, TX
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Formula - '96 Firebird Formula/Trans-Am
90 day: 19.31 mpg (US)
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Quote:
Originally Posted by ShadeTreeMech View Post
I suspect not injecting fuel also helps to prevent backfire and the noise I hear from an older carbed car when going downhill; kind of a burbling noise while going downhill, especially if you downshift.
Yup, the average carb doesn't cut fuel based on throttle position, it continues to draw as much fuel as the air pulling it requires. So you get a lot of unburnt fuel when coasting. My truck has a nice thundering coming off the freeway, with the occasional snap-crackle-pop when coming down from 3-4k rpm. I'm confident that if I had a spark plug in the pipes I could have a pretty wicked show coming off the freeway.
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