Preheating intake air

[Rags37]

I am not so much interested in increasing HP as I am in increasing MPG. I have seen all the hype on chips, modules, etc that trick the IAT into thinking the air is colder than it is so the ECU will increase the gas input. I am wondering if I PREHEAT the air passing by the IAT, will this cause the ECU to decrease the amount of gas input, and if I do that what kinds of problems will I encounter if any?
Thanks in advance!!!

[DeadBlade89]

i dont care what anyone says, i believe that intakes decrease gas milage. They arent going to help it.

more air = more gas. simply put

[Rags37]

Originally Posted by DeadBlade89

i dont care what anyone says, i believe that intakes decrease gas milage. They arent going to help it. more air = more gas.

I'm not talking about increasing the air intake, only preheating the air that is being taken in via the air duct.

[jakegday]

rags, thats a nice thought but it wont improve your mpg by any means, how did you plan on heating the air anyways???

[1991tercel]

Do some research on your question......google it and shit...Cooler air is what you are wanting...if you got a CAI and a proper tune you would see increased miliage. Most people see a decrease though because the "sound: makes them think they are speed racer or their a/f ratio is off. Wanna get better fuel economy then get a car that was meant for that. find yourself a CRX or a 1.0 3 cylinder geo metro...that shall help you out

[Rags37]

Originally Posted by jakegday

rags, thats a nice thought but it wont improve your mpg by any means, how did you plan on heating the air anyways???

Well there was a couple of ways. 1. Make a cover for the exhaust and funnel the air to the intake tube. 2. Build a copper tube that would fit inside the intake tube and connect this to the heater hose with a needle valve to contol the amount of fluid passing thru tube, with a return to the other side of the heat hose to continue the flow of heater fluid. 3. Build a copper tube to fit inside the intake tube, tap into the exhaust manifold and draw off the exhaust, this would also use some of the unused gasses from the exhaust.

I thought if the IAT sends data to the ECU for the gas to air ratio when cold to add more gas, then by passing warmer air over the sensor it would lean out the mixture.

However I will be the first to admit I know very little to nothing about how the system works.
Thanks

[Rags37]

Originally Posted by 1991tercel

Do some research on your question......google it and shit...Cooler air is what you are wanting...if you got a CAI and a proper tune you would see increased miliage. Most people see a decrease though because the "sound: makes them think they are speed racer or their a/f ratio is off. Wanna get better fuel economy then get a car that was meant for that. find yourself a CRX or a 1.0 3 cylinder geo metro...that shall help you out

Now that wouldn't be any fun would it??? PS. By the way I did Google it and was unable to find information on it. Only found info on getting colder air added. Chips, Modules, Turbonator etc.
Thanks

[wrightz28]

Originally Posted by Rags37

Well there was a couple of ways. 1. Make a cover for the exhaust and funnel the air to the intake tube. 2. Build a copper tube that would fit inside the intake tube and connect this to the heater hose with a needle valve to contol the amount of fluid passing thru tube, with a return to the other side of the heat hose to continue the flow of heater fluid. 3. Build a copper tube to fit inside the intake tube, tap into the exhaust manifold and draw off the exhaust, this would also use some of the unused gasses from the exhaust.

I thought if the IAT sends data to the ECU for the gas to air ratio when cold to add more gas, then by passing warmer air over the sensor it would lean out the mixture.

However I will be the first to admit I know very little to nothing about how the system works.
Thanks

All of these ideas are what killed engine performance in the '70's and '80's.

You're cover over the exhaust is a heater stove that was used on carbureted engines for cold weather conditions.

Your tube off the exhaust, EGR, which needs to be regulated, can't be at all times, especially idle.

The IAT is primarily only used at start up.

And a lean mixture = burnt valves and pistons.

[Rags37]

Originally Posted by wrightz28

All of these ideas are what killed engine performance in the '70's and '80's.

You're cover over the exhaust is a heater stove that was used on carbureted engines for cold weather conditions.

Your tube off the exhaust, EGR, which needs to be regulated, can't be at all times, especially idle.

The IAT is primarily only used at start up.

And a lean mixture = burnt valves and pistons.

Thanks much for the information, guess I will have to scratch those ideas.

[wrightz28]

If you're trying to increase mileage, there are only a few true ways:

1-alignment and tires, proper size, pressure, tread and regular rotation.

2-remove excess weight, the trunk is for taking items from point a to point b, not for indefinate storage.

3-routine maintnance of the igntion and fuel systems

4-curbing and motioring personal driving habits

Just to name a few for idea. Today's vehicles diagnostic systems are only as good as they were designed to be, and OBD II can limitly adapt as neccessary. If the vehicle is not acheiving it's rated mileage, something of the above list is not right. I've even had my carbureted cars exceed their ratings with nothing more than religous maintenance.

[Rags37]

Originally Posted by wrightz28

If you're trying to increase mileage, there are only a few true ways:

1-alignment and tires, proper size, pressure, tread and regular rotation.

2-remove excess weight, the trunk is for taking items from point a to point b, not for indefinate storage.

3-routine maintnance of the igntion and fuel systems

4-curbing and motioring personal driving habits

Just to name a few for idea. Today's vehicles diagnostic systems are only as good as they were designed to be, and OBD II can limitly adapt as neccessary. If the vehicle is not acheiving it's rated mileage, something of the above list is not right. I've even had my carbureted cars exceed their ratings with nothing more than religous maintenance.

I just purchased the car less than a month ago, so as to #1 that should not be a problem. The only thing I have in the trunk is 5 eggs cartons with golf balls in them. 3. Again shouldn't be a problem. 4 You know how we old Fart's drive, lost the desire to hot-rod, years ago. Then again maybe you aren't that old. LOL. The last MPG check was 22.5, was told I should get 25 city, and 30+ highway. Maybe the weather being cold is the reason. Oh well I am getting better milage than I was with my Towncar.

[wrightz28]

Originally Posted by Rags37

Maybe the weather being cold is the reason.

Most fuel producers now a days are using different blends in colder versus warmer climates so that is quite possible. In the next few months when suppliers are using up the last of the winter blend in warmer climates, watch how many performance (or lack there of) threads creep up.

Based on the MPG you've observed already, it's within 90%.not bad for a start, assuming it's a used purchase.

[Rags37]

Originally Posted by wrightz28

Most fuel producers now a days are using different blends in colder versus warmer climates so that is quite possible. In the next few months when suppliers are using up the last of the winter blend in warmer climates, watch how many performance (or lack there of) threads creep up.

Based on the MPG you've observed already, it's within 90%.not bad for a start, assuming it's a used purchase.

Yep it is a 2002 Sunfire, I went from a 97 Towncar to the Sunfire. Miss the ride, but hope to get lot better gas milage. By the way have you checked out any of these HHO gas things to run with along with the gas engines? ie: Water4gas