Originally Posted by turbotrana (Post 110448)

Running a HAI may not be the best way to improve economy IMO. All I see it doing is making the IAT sensor read higher so that the fuel maps are leaned off via the temp compesation tables in the engine management system.

Originally Posted by suspendedhatch (Post 110226)

Hot intake air causes the combustion chamber to run hot.

Originally Posted by 2000mc (Post 110690)

...why would there be these temp compensation tables that lean off the fuel maps? probably because the manufacturers think hot air is less dense air.

Originally Posted by 2000mc (Post 110690)

...why would there be these temp compensation tables that lean off the fuel maps? probably because the manufacturers think hot air is less dense air.

Originally Posted by 96sc1 (Post 111610)

I have not yet modified my 96 Saturn SC1, but I took two road trips this year to Arizona and in March I averaged 45 MPG and in June (with temps in the 100's) I averaged 49 MPG so I am pretty sure that HAI is the way to go. I am saving up my pennies (if I get impatient I may sell plasma too) for a Scangauge, because there will never be an answer to the general question of what's the best intake temperature. The best temperature is the one that works best for you and your car. This can only be determined through experimentation and you will need good instrumentation to nail it. I think the hardest part will be building a device to keep the temperature constant.

Originally Posted by turbotrana (Post 110757)

You have air temp compensation maps in most EMS. When air is cold it is more dense and needs more fuel and visa versa, when its hotter it needs less fuel. You program air temp comp so the car runs more uniformly between hot and cold climates. Its not easy to get it to run consistenly bewteen the extremes but the manufacturers do it quite well.
But if you are introducing 100deg air into the air intake you would be leaning the maps to the maximum.

There are even fuel temp comp maps

Originally Posted by Project84 (Post 109870)

Well, to be honest, that was my first ALL HIGHWAY mileage recorded in about a year and a half. I rarely take my car on trips as my g/f loves her Grand Prix w/ all it's add-on's and comforts.

I was expecting 35-36 mpg... like I said somewhere else (Gas saver's w/ record tanks thread) I recalculated the mileage like 5 times and nearly fainted when I was looking at 43 mpg... added the HAI heat shield Sunday morning and SG reported 47.2mpg on the trip home, but I'm going to add some city to it before filling up.

Thanks for the kind words!

I got grill block material from my Dad when I was home over the weekend, it's about 1/8" thick rubber matting. I figured it would hold up to the elements nicely, but I'm not sure it will stretch and hold it's shape and not deform under the pressures of 60mph.

Might be taking the car on a 640mile trip (one way... roughly 1,300 miles total) next week to SC. So my average is going to be way up if I keep reporting 40+.

I must say, I didn't think it was possible... now I'm thinking ANYTHING is possible.