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Old 05-21-2008, 11:10 AM   #1 (permalink)
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Will these increase MPG?

1. Custom built exhaust system. I know these add a decent amount of HP but do they add MPG?

2. COLD Air Intake. I know in older cars they added a signifigant increase in milage but do these devices add much MPG in todays computerized cars?

3. Switching from stock spark plugs to iridium.

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Old 05-21-2008, 11:55 AM   #2 (permalink)
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reducing backpressure will reduce HP...just so you know.
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Old 05-21-2008, 12:22 PM   #3 (permalink)
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You also have to remember that many performance upgrades are meant for the top end. What this means is the power is either at WOT or near WOT. Sometimes at the detriment to power lower in the bandwidth- meaning you may affect cruising mpg/speed.

If you're looking for mpgs, you don't really want the power up top. You're looking to up the power down below so your car doesn't have to work so hard to get up to cruising speed.

1. Exhaust- top end
2. Intake top end..
3. Newer sparkies definitely help.

Why would intakes, especially CAIs affect mpgs? It's counter intuitive and people will argue it, but it actually drops mpgs. This is because modern engines adapt to the colder air by enriching the fuel air mixture.
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Old 05-21-2008, 01:57 PM   #4 (permalink)
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more fuel will be forced in the combustion chamber if you feed more air, the car's computer will automatically do this.

low back pressure exhaust will kill whatever torque you have.

If you want to increase mpg, your only options are:
reduce weight
go easy on the gas
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Old 05-21-2008, 02:51 PM   #5 (permalink)
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Have you done a cost benefit analysis? How long will it take you to recoup your expenditures on these upgrades in fuel savings?

If you go from 26 to 28 MPG and fuel costs $4/gallon, your fuel costs are reduced by 1.1c per mile. If you spend $1000 on these upgrades, you'd have to drive 91000 miles before you'd break even. Assuming you drive 12000 miles/yr, your annual savings is $120 and it will take you 8.3 years to break even.
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Old 05-23-2008, 01:24 PM   #6 (permalink)
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I heard adding a turbo increases your mpg +5 on all 4cyl engines especially if they start spooling early, is this true? :-DDDDD
but yeah less weight and steady foot is my best trick
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Old 05-23-2008, 01:26 PM   #7 (permalink)
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Turbos actually do help increase MPGs actually, especially in diesels, but this depends on the car and I'm thinking the amount of boost as well.

But it goes back to how much xxxx have you invested to save xx at the pump?
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Old 05-23-2008, 01:47 PM   #8 (permalink)
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hmm how does it increase mpg? unless you change the ratio fuel:air ?

umm quick rundown if you know please...
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Old 05-23-2008, 02:24 PM   #9 (permalink)
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scroll down to page 36 of this pdf from Honeywell.
http://www.honeywell.com/sites/servl...ID=npointadmin

A better read:
http://www.mpgresearch.com/forum/vie...hp?f=33&t=2120
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Old 05-23-2008, 02:26 PM   #10 (permalink)
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Turbo chargers allow you to have a smaller engine, the boost is used only for acceleration, during cruising, if the engine is sized right, the small engine will be able to maintain the cruise speed without boost from turbo.

In that scenario, you should have lower weight with small engine and power when you need it.

Displacement on demand does not lower vehicle weight.
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Old 05-23-2008, 10:14 PM   #11 (permalink)
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Wouldn't installing a turbo force one to use premium gas? I don't believe I have seen a factory engine with a turbo running on regular.


It seems like if you were only looking at it from ourely a financial standpoint, a turbo would be a bad choice.
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Old 05-24-2008, 12:05 AM   #12 (permalink)
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Quote:
Originally Posted by pwain View Post
Wouldn't installing a turbo force one to use premium gas? I don't believe I have seen a factory engine with a turbo running on regular.


It seems like if you were only looking at it from ourely a financial standpoint, a turbo would be a bad choice.
Maybe you should buy this thing in the banner at the bottom of this page....

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Old 06-03-2008, 05:09 PM   #13 (permalink)
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Quote:
Originally Posted by pwain View Post
Wouldn't installing a turbo force one to use premium gas? I don't believe I have seen a factory engine with a turbo running on regular.


It seems like if you were only looking at it from ourely a financial standpoint, a turbo would be a bad choice.

You would have to weigh the options.

Yes, maybe you'll have to up the gass to premium...but if it gives you an xx difference, maybe you'll want to as oposed to only getting an x mpg difference.

If you look at the diesels in Europe, you'll see that they take advantage of turbos... Even the gas powered ones give a nice mpg difference over non turboed cars.
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Old 06-03-2008, 06:45 PM   #14 (permalink)
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Turbos are present in almost all diesels because they help increase efficiency of the engine. Diesels have great low-end torque, but have little high-end power which is hwere the turbo helps out. However, the turbo can also help increase torque output if that's what you need, in a truck for example.

Also you don't have to worry about detonation in diesels, so they can still have something like 16:1 compression ratios and still have turbos.
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Old 06-04-2008, 04:04 PM   #15 (permalink)
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Quote:
Originally Posted by touringcamry View Post
Ha, don't ya just know...

Pretty sure if you could instantly double your MPG everyone would be doing it by now...and it would be advertized on more that just a few website banners...

scammers, lol...
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