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Old 08-08-2006, 09:09 AM   #1
speedyHAM
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News Want to get better gas mileage???

Too bad, there's nothing you can do.

http://www.cnn.com/2006/TECH/science...ion/index.html

I love the magnet company response.
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Old 08-08-2006, 09:10 AM   #2
HOV
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IBmythbustersepisoderecaps

[WTLW]If you just drive the speed limit and don't play boy racer at every stoplight, you'll gain a few MPG[/WTLW]
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Old 08-08-2006, 09:15 AM   #3
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what? the turbonator works. Put two inline to double the efficiency!!


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Old 08-08-2006, 09:35 AM   #4
teh Phil
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Man, I wish I was a professionally trained magnet installer.
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Old 08-08-2006, 09:55 AM   #5
wyn525i
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Quote:
Originally Posted by teh Phil
Man, I wish I was a professionally trained magnet installer.
Maybe someday, maybe, you can have that skill.
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Old 08-08-2006, 09:58 AM   #6
The Enemy
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Old 08-08-2006, 10:07 AM   #7
plunk10
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compressed air might increase your fuel economy (higher tire psi). that's about it.
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Old 08-08-2006, 10:11 AM   #8
Chuck H
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There's lots you can do, but unfortunately, it's all common sense stuff, instead of miracle scientific breakthroughs like people are hoping for.

Keep your tires properly inflated, slow down and drive the speed limit, get rid of your land yacht and drive a lightweight vehicle with a small motor. It's pretty basic stuff.

I guess gas prices haven't hit my threshold of pain yet, though, because I'm still not ready to trade in my relatively inefficient WRX for a hybrid or tiny econobox. I'll pay the extra $$$ for the smiles the Subie gives me on a daily basis!
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Old 08-08-2006, 10:33 AM   #9
Master2192
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Quote:
Originally Posted by plunk10
compressed air might increase your fuel economy (higher tire psi). that's about it.
Actually, boost will increase fuel mileage as well...at low rpms. There was another one of those fuel mileage debates in general and this Article came up.
http://www.roadandtrack.com/article....rticle_id=1820

It seems to work, I shift at 2500 rpms but give it plenty of throttle (ie. almost WOT). Works on both the WRX and my RS.
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Old 08-08-2006, 01:37 PM   #10
Midwayman
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Quote:
Originally Posted by Master2192
Actually, boost will increase fuel mileage as well...at low rpms. There was another one of those fuel mileage debates in general and this Article came up.
http://www.roadandtrack.com/article....rticle_id=1820

It seems to work, I shift at 2500 rpms but give it plenty of throttle (ie. almost WOT). Works on both the WRX and my RS.
ITs not boost. That raises your BSFC, and lowers your fuel mileage. But full throttle at low rpm is the way to go. It make your engine more volumetrically efficient. No throttle plate restriction to increase pumping losses,etc. The key is that you have to short shift.
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Old 08-08-2006, 01:44 PM   #11
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my 2.2 gets 23mpg
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Old 08-08-2006, 06:09 PM   #12
plunk10
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<---30-32 mpg
0-60 in 6.5
but only 2 seats, and hardly any trunk FTL
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Old 08-08-2006, 06:14 PM   #13
Master2192
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Quote:
Originally Posted by Midwayman
ITs not boost. That raises your BSFC, and lowers your fuel mileage. But full throttle at low rpm is the way to go. It make your engine more volumetrically efficient. No throttle plate restriction to increase pumping losses,etc. The key is that you have to short shift.
BSFC will be based off if you are running rich. With the ultra low compression of a turbo motor, it needs a good amount of boost to raise that and increase engine efficiency. I don't know how the WRXs run, but my RS stays stoic until about 95% throttle at these low of rpms. You may be able to pull off stoic with the 04-05 WRXs at these low rpms and mid to high boost. However a 2 liter low compression engine is pretty gutless below 2500 rpms, even at full throttle.
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Old 08-08-2006, 06:26 PM   #14
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I saw this on CNN earlier today, the magnet part cracked me up.
Chuck H is on point about tire pressure (!).

Just this past Sunday I was chatting with a guy I know here whos only means of transpo is a scooter. Last spring I saw him in town and while chatting I noticed his front tire looked low on air. Not flat or anythign but just low. I told him to swing by my house and I'd check it for him and top it off with my compressor.
It turns out he was down IIRC 10+ psi front and roughly same at the rear. He'd not noticed any handling issues up to that point and had never thought to check his tire pressures before.
FFWD to this past Sunday I saw him again in town and offered to have him swing by for dinner and to have some burgers with us.
He stops by and he mentioned that since I filled up his tires he immediately noticed his scooter was easier to steer and more importantly his mileage "shot up" which he does track by the tank. He'd said that he saw a near 15% increase in mileage per tank just from the tires being topped off to proper levels with air. He's not even a big guy and his bike is a little Vespa looking knock off. We rechecked his air pressure again to be sure it's still up to spec.
Proper air pressure can take you a long way.

- Janq
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Old 08-08-2006, 06:34 PM   #15
ColinL
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Quote:
Originally Posted by plunk10
<---30-32 mpg
0-60 in 6.5
but only 2 seats, and hardly any trunk FTL
<-- 36-42 MPG depending on my wrist
0-60 in well under 4.0
but only 2 seats, trunk space for two 6" sub sandwiches, no AC and no cruise control.

Last edited by ColinL; 08-08-2006 at 06:52 PM.
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Old 08-08-2006, 06:44 PM   #16
bemani
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Quote:
Originally Posted by Janq
Proper air pressure can take you a long way.

- Janq
Except the problem is unless you measure the mpg for all pressures on your particular tires, you don't know what pressure is proper.

Manufacturer recommended tire pressure is only good for the oem tires.
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Old 08-08-2006, 06:47 PM   #17
Pretty Waste
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Quote:
Originally Posted by speedyHAM
Want to get better gas mileage???
Nope. 15MPG makes me happy. *Smacks forehead*
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Old 08-08-2006, 06:51 PM   #18
Midwayman
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Quote:
Originally Posted by Master2192
BSFC will be based off if you are running rich. With the ultra low compression of a turbo motor, it needs a good amount of boost to raise that and increase engine efficiency. I don't know how the WRXs run, but my RS stays stoic until about 95% throttle at these low of rpms. You may be able to pull off stoic with the 04-05 WRXs at these low rpms and mid to high boost. However a 2 liter low compression engine is pretty gutless below 2500 rpms, even at full throttle.
BSFC isnt really about running rich or lean. Its about fuel consumed per HP. I suppose on a real low compression engine, there is a point at which some small amount of boost would produce more hp per gallon. Its not really the point though. Its that low rpm is the deal to increase MPG, not worrying about boost.

Though I wonder about the whole closed loop/open loop issue. Most car run really rich in open loop mode, so you'd probably need to stay in closed loop mode to achieve the best fuel saving.






Or just go buy a more fuel efficient car and not worry about it.
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Old 08-08-2006, 06:53 PM   #19
Midwayman
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Quote:
Originally Posted by Janq
Just this past Sunday I was chatting with a guy I know here whos only means of transpo is a scooter.
It turns out he was down IIRC 10+ psi front and roughly same at the rear.
Proper air pressure can take you a long way.

- Janq
Not to mention improper air pressure on a scooter or motorcycle is flat out dangerous.
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Old 08-08-2006, 06:56 PM   #20
Calebz
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Quote:
Originally Posted by speedyHAM
Too bad, there's nothing you can do.

http://www.cnn.com/2006/TECH/science...ion/index.html

I love the magnet company response.



I was in that Biowhatever office about 2 months ago. I do IT work for another company in that building. My client sent me over there because they had some questions.

It was .... interesting
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Old 08-08-2006, 07:02 PM   #21
Samuelleeogden
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i shift at 2k rpm when i'm around town.


it SOUNDS like an 18 wheeler, so it must be getting bett4r milage!
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Old 08-08-2006, 07:10 PM   #22
WRX02WRB
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Quote:
Originally Posted by Calebz


I was in that Biowhatever office about 2 months ago. I do IT work for another company in that building. My client sent me over there because they had some questions.

It was .... interesting
We need details.
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