Where did the hot-air intake idea originate?
I'm curious.
Sorry, first post. This site has me pumped to start some aero mods, but after a lot of reading and testimonials I'm still not sold on the HAI/WAI concept. If I knew where this started, I think that'd help me determine the validity. Thanks :D EDIT: I'm not looking to start a debate like in all the other threads - just looking for the source of this trend... was it an enthusiast? An OEM? Just a quick answer will suffice :D |
Back in the day people were putting resistors in their IAT sensors in order to trick the computer knowing it leaned based on hot temperatures. Eventually some of us realized it was stupid to trick the computer into improperly manage the engine when we could introduce warm air and have the computer do an honest job.
Welcome to EcoModder! |
delslo -
This is not *the* origin, but it's where I first heard about it : Modified air intake for hot air added 7.2% to mpg - SaturnFans Forums - February 2006 (EDIT: PS, the original poster also used IAT sensor fakes, but I agree with SVOboy that changing out the sensor doesn't work) CarloSW2 |
Welcome. When you have time, it is a common discussion & there are plenty of member contributions throughout the site.
The nineties trend of customizing with cold air intakes facilitate more oxygen per volume sends the signal/message to add more fuel to proper ratios, hence more hp but lower FE (+ Aggressor body kits & big rear wings...etc.). The current oughties trend is the opposite. WAI lowers the oxygen per volume going through the O2 mass sensors and the corresponding fuel/air ratio is leaner hence lower hp but lower fuel use (+ grill blocks & wing deletions...etc). Leaner combustion requires close monitoring of spark plugs & injectors. |
It can be traced back to the 30s or 40s, when scientists were experimenting to determine corrections factors for varying atmospheric conditions.
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Now, any preferred thread for continued discussion on this? There's so many, I'm not sure which one to reply to. |
i first heard about the idea when Smokey Yunick was promoting it. Warm air is less dense, so the injectors will allow for that, and possibly for the improved vaporization and combustion, leaning it out on a mass basis as well. Those are the only real benefits, unless you need help to avoid using the maximum HP you'd get with cold air.
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Well, hot air is less dense, that's for sure. Less dense air means more throttle and rpms to create the same output; ie more load. Additionally, less dense air reduces your combustion chamber pressures similar to lower compression ratio. This is the reason you can run lower octane at higher altitudes. Neither of these lend themselves to efficiency. Further, all things being equal, cold air, which is denser, will lean a/f, as in a carburetor situation. :confused:
The reason I asked for the source is you'd think it'd be fairly easy for an OEM to integrate a load or tps based flap that would alternate between hot and cold intakes when needed if there was in fact merit to the claim. Excuse my cynicism that is borne from a performance background/culture abundant with wild claims. My Del Sol is slow, so may as well go for mpg :D, but I really would like to understand this further. |
delslo -
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I lost the "perfect URL" for this, but here is a good explanation : Tips on Reading Gauges; Air-Fuel Ratio Monitor Quote:
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CarloSW2 |
delslo -
Here's a thread like yours : http://ecomodder.com/forum/showthrea...take-7388.html CarloSW2 |
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