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Old 03-06-2003, 06:22 PM   #1
r_o__
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Dizzy air restriction vs gas mileage

last week i was watching horsepower tv....does anybody esle out there watch this show..it's pretty good...anyways the question is, on the show, they where doing upgrades on buddy's mustang...they installed a bigger throttle body, air intake ,k&n type cone filter,catback system,. having done all of this they gained horsepower..that i understand... but they also said that all this stuff would increase fuel mileage......well on my 98 sc1 ..i have a cone filter on the end of the stock s tube...and a straight through muffler.....with this stuff on my car , my fuel mileage decreased....so what is the problem,,,how can it work one way for me and another for them....can anybody explaint it to me????


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Old 03-06-2003, 06:38 PM   #2
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well, when you accelerate. your new filter allows you to use more gas to cope with the additional air. have you tested continuous highway driving? It should require less throtle to maintain speed therefore using less fuel.

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Old 03-08-2003, 03:05 AM   #3
Sam96SL2
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Default Re: air restriction vs gas mileage

Quote:
Originally posted by r_o__
last week i was watching horsepower tv....does anybody esle out there watch this show..it's pretty good...anyways the question is, on the show, they where doing upgrades on buddy's mustang...they installed a bigger throttle body, air intake ,k&n type cone filter,catback system,. having done all of this they gained horsepower..that i understand... but they also said that all this stuff would increase fuel mileage......well on my 98 sc1 ..i have a cone filter on the end of the stock s tube...and a straight through muffler.....with this stuff on my car , my fuel mileage decreased....so what is the problem,,,how can it work one way for me and another for them....can anybody explaint it to me????


RO
Welcome to the world of modding, thats one of the reasons i turned my car back to stock, gas mileage sucked..i never understood why they say you GAIN mileage, when in order to make more power you need MORE fuel and MORE air..hence the loss in MPG, thats the trade off one faces with modding.

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Old 03-08-2003, 03:12 AM   #4
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if all you were to do is to increase the amount of air getting into the engine, i.e. with a k&n air filter, then you would see an increase in available HP. If you "chose" not to take advantage of this increased available HP, you would see an increase in your mph instead. now how much of an increase depends on a lot of things.

when you start messing with the throttle body and the exhaust and stuff, you're going to find out why engineers didn't do those things building the car in the first place.

adding a k&n filter will not have any detrimental effect on your mpg unless you start driving your car differently. it simply removes a large amount of negative air pressure resulting when accellerating (increasing air flow to the engine) due to the nature of the standard paper filter.

It's considered by most people to be a no-brainer, no-compromises, legitimate upgrade to improve the performance of your car by a small, but noticeable amount.

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Old 03-08-2003, 03:30 AM   #5
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i figured everyone knew, that the more Mods you add the Less MPG you get... lol, wait till you upgrade to a Turbo if you think it's bad now... Always remeber, the more HP you add the more fuel you burn to achieve that added HP..

only thing i could recommend for this problem is the Apexi S-AFC
but be warned leaning too much can casue you to blow your engine, and you could really screw things up....

All that increasing your HP is somewhat of a plowy to help sell the product... but the main thing i notice is better gas milage on the e-way

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Old 03-10-2003, 02:58 AM   #6
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more fuel ignited = More power, this is a general rule of thumb. The more power you get the more fuel it will take to maintain that power. the only upgrade i do is intake, cold air is better for an engine. I mod the intake, has a little better performance, more giddy up in the peddal but if driven over long distances it uses very little gas. Now driving in town is going to use 10X more fuel seemingly because you are burning fuel and not moving constantly, i have found that like 40% of my in town time is spent sitting at a light. This might give you something to think about during the next traffic jam.

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Old 03-10-2003, 09:48 AM   #7
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more air needs more fuel to burn.

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Old 03-10-2003, 10:43 AM   #8
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Actually, less restriction in the intake/filter area and exhaust will incress gas mileage by a small amount, if you keep your foot out of it. Less restriction allows you engine to move air more effeciently. Intakes do not incress that amount of air your car uses during normal operation economy minded driving, that restriction is made by the throttle butterfly.

Where people see a decease is that they want to go faster. Remember that the intake allows you to more effeciently move air; ie, with the same amount of force you can more more air.

At the same posistion less restrictive intakes allow the engine to pull in more air and use more fuel, but make more power.

Accelerating at the same speed, both a car with and without a high performance intake would burn about the same amount of fuel. The one with less restriction would get a little better fuel mileage over time, because of less intake drag and better throttle response. But the fuel savings is normally seen, because users of performance parts do not drive for optimal fuel usage.

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Old 03-10-2003, 04:15 PM   #9
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My mileage has stayed about the same. With 75,000 miles I average right at 34mpg and that is a 60/40 mix of highway and city driving. I have the intake, throttle body, header and cat-back exhaust. It seems the lack of gas-guzzling back pressure has cancelled out any lower mpg that otherwise might have come from all the mods.

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