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10-21-2008, 01:55 AM | #1 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Huge Gas Milage Reduction from installation of intake
So my yaris sedan auto was geting about 36mpg adverage. Thats with no special driving techniques just driving normally. After installation of my weapon r intake. My mpg dropped to 29-30. I attribute this to the relocation of the maf sensor. Since how much the injectors spray is directly tied to maf readings.
The MAF sensor is relocated just a few inches away from the throttle plate and i think that even though the same amount of air may be going into the intake at the same throttle position witht he stock intake the location of the sensitive sensor may get a false reading of air when accelerating. Maybe even at a constant throttle position. I checked this by hooking up my scanner to the computer and watching live data readings of the fuel trim. If you know a bit about cars fuel trim should always be close to zero with a little switching picked up by the oxygen sensors. My fuel trim is at about 20 percent for long term. Which means the car is constantly dumping additional fuel leading to my reduction of fuel economy. I am curiouse to see what happens to my fuel trim if i put my factory air box back but install a simply drop in K&N filter.
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10-21-2008, 08:18 AM | #2 |
Drives: '08 Hatch Join Date: Oct 2008
Location: Central PA
Posts: 43
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If the problem is that the MAF is reading differently, and the ECU then makes it run rich, isn't it possible to have the ECU data changed to make it run more lean? In places at higher altitudes it is sometimes necessary to have the air/fuel mixture manually changed. I presume the same kind of thing is happening here. Talk to a mechanic and find out if this is possible. It may be an easy fix.
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10-21-2008, 04:13 PM | #3 |
Drives: 2007 Black Yaris sedan Join Date: Sep 2006
Location: Atlanta
Posts: 884
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What WR intake did you buy.
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10-21-2008, 04:14 PM | #4 |
Not really here...
Drives: 2008 Blazing Blue S hatchback Join Date: Oct 2008
Location: USA
Posts: 1,062
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10-21-2008, 04:54 PM | #5 |
~ ambient one ~
Drives: 2009 Bayou Yaris Liftback Join Date: Jan 2007
Location: Long Island, NY
Posts: 1,046
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Hmm ... the AFE actually improved mine by a couple MPG.
As for a real brand name intake. I believe the Weapon R is the cheapest out on the Market right now (under $120 I've seen). My AFE was $165 shipped.
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AMBIENTLIFESTYLE
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10-21-2008, 05:55 PM | #6 |
Drives: 2007 Black Yaris sedan Join Date: Sep 2006
Location: Atlanta
Posts: 884
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WR has 2 versions,I just bought one of them,so I really want to know which version you bought.
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10-21-2008, 06:06 PM | #7 |
toyota
Drives: 2007 Yaris RS Blazed Join Date: Oct 2006
Location: toronto, canada
Posts: 3,637
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is it the secret weapon r that you have..
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10-21-2008, 06:10 PM | #8 | |
Drives: Yaris Liftback Join Date: Oct 2008
Location: Lexington, KY
Posts: 55
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Quote:
you should be good to go again. |
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10-21-2008, 06:11 PM | #9 |
Drives: Yaris Liftback Join Date: Oct 2008
Location: Lexington, KY
Posts: 55
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BTW, my Simota Carbon Charger ($120 shipped) gained 1.5 MPG.
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10-21-2008, 07:46 PM | #10 | |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Quote:
I know they do sell performance maf sensor that can read higher flows of air for heavily modded cars but should be unessisary for our cars.
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10-21-2008, 09:56 PM | #11 |
rarer than JDM -1 of 1!
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I have the Blitz LM SUS intake. I noticed a decrease in FE, but after letting the ecu cycle after a few starts or so, it went back to normal. Staying away from increased high rev throttling and i've never had a problem since.
You have a good point though. Depending on how far the maf is away from your T.B. makes a large difference in A/F readings. Last edited by anonymous user; 10-22-2008 at 02:48 AM. Reason: corrected intake model |
10-21-2008, 10:23 PM | #12 |
Drives: 2007 Yaris Liftback Join Date: Oct 2008
Location: Saint Petersburg, FL
Posts: 351
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i actually gained 5mpg w/ my Fujita F5, i was getting about 26....now about 31mpg
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10-22-2008, 12:39 AM | #13 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Hmmm I may have to switch to a different brand. Anyone want to buy a slightly used weapon R intake =)
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10-22-2008, 09:09 PM | #14 |
Drives: 2007 Black Yaris sedan Join Date: Sep 2006
Location: Atlanta
Posts: 884
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YarisSedan,how did you mount your intake,I cant see where the bracket and bolt with rubber stoper go.
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10-22-2008, 09:09 PM | #15 |
Drives: 2007 Black Yaris sedan Join Date: Sep 2006
Location: Atlanta
Posts: 884
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Instructions suck.
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