P&G not helpful in Saturn SL2 - Page 9 - Fuelly Forums
Go Back   Fuelly Forums > Fuel Talk > Hypermiling
Search Today's Posts Mark Forums Read
Thread Tools Display Modes
Old 10-22-2012, 04:38 AM   #81
Registered Member
theholycow's Avatar
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Originally Posted by 8$PG View Post
The best way would be to have two intake channels and shifting between them depending on the power requested.
This was standard equipment on GMs in the 1980s (and I think 70s too). Called Thermac, it used vacuum and an air thermostat to control a damper that mixed intake air from the snorkel or the exhaust manifold stove. Granted, that snorkel was still pulling warm underhood air in a lot of vehicles, but some were piped to a CAI...mine is now. When vacuum got below 5 inches, the damper would close the hot manifold air and open the snorkel air instead of mixing thermostatically.

This sig may return, some day.
theholycow is offline   Reply With Quote
Old 10-22-2012, 05:09 AM   #82
Registered Member
Join Date: Jan 2012
Posts: 70
Country: Sweden
OT; theholycow: Ok, so that's how it's implemented. My brother has this in his Silverado 2500 truck -91. But the "throttle" has jammed in the closed position only taking air from the exhaust manifold stove. He took the lid off and replaced the air-filter instead to an open aftermarket filter. Not the most FE car to start with anyway.

8$PG is offline   Reply With Quote
Old 10-26-2012, 09:41 AM   #83
Registered Member
Join Date: Dec 2007
Posts: 618
Country: United States
Funny seeing this still alive....

HAI was explained to me simply as "hot air helps atomize fuel better, reducing the amount the injectors need to spray" so I understood that by adding hot air to the intake air, the fuel would burn more efficiently, and I'd use less gas pedal to move forward, but as mentioned, at the expense of horsepower taking a small drop.

Now that could be completely off, but I do know that depending on your car whether it's MAP equipped or MAF equipped, using a HAI works or it doesn't. MAF cars sense the incoming air temperature and the computer recalculates fueling to maintain optimal levels, MAP cars (like the S-Series Saturns) cannot do this, so the computer cannot alter fueling based on intake air temperatures... so fabbing a HAI and feeding the engine 160*F air effectively increases efficiencies beyond what the computer can adjust for, and you increase FE.
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
Project84 is offline   Reply With Quote
Old 10-29-2012, 03:53 AM   #84
Registered Member
Join Date: Jan 2012
Posts: 70
Country: Sweden
My previous car had MAP-sensor and IAT-sensor, that is why it was possible for scangauge to calculate the fuel consumption because you need both these, engine displacement and a scaling constant. I would think most modern cars have an IAT-sensor.

8$PG is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Another crX... what engine is this? fuel injection? landspeed General Discussion (Off-Topic) 11 05-09-2008 12:17 AM
Tire Pressure Inflation - what is too much? 1993CivicVX Automotive News, Articles and Products 11 09-23-2007 05:54 PM
NMG (Sparrow) owner "first 1000 miles" report MetroMPG Electric and Solar powered 8 03-25-2007 07:22 PM
hello GasSavers_nathan Introduce Yourself - New member Welcome 3 12-07-2005 03:59 PM
First coat of paint is on!!! Matt Timion General Discussion (Off-Topic) 12 10-03-2005 07:50 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 12:14 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.