K&N air filter - TundraTalk.net

dan plantz · 06-05-2008, 09:28 PM

Have new 2008 tundra with 5.7 engine. Have installed K & N air filter and my gas mileage has dropped 1.5-2MPG around town. All previous use of K&N filters on other vehicles have had opposite results. What is the purpose of the charcoal filter in lid of air filter box. Would removal allow better air flow and mileage with the K & N? Any advice or first hand experience with this problem would be appreciated. tks dan

Mickey · 06-05-2008, 10:46 PM

Quote:

Originally Posted by dan plantz

Have new 2008 tundra with 5.7 engine. Have installed K & N air filter and my gas mileage has dropped 1.5-2MPG around town. All previous use of K&N filters on other vehicles have had opposite results. What is the purpose of the charcoal filter in lid of air filter box. Would removal allow better air flow and mileage with the K & N? Any advice or first hand experience with this problem would be appreciated. tks dan

Dan I use AFE instead of an K&N. My truck actually went up from 1.5 to 2mpg. Try computing your mileage instead of the truck's computer doing it. See if there is a difference. I'm not sure why it went down.

Mickey · 06-05-2008, 10:47 PM

Welcome to the site and enjoy your ride.

Mickey · 06-05-2008, 10:49 PM

Post some pics also when you can.

Hawaii 5.7 · 06-05-2008, 11:42 PM

Take the negative cable off the battery for several minutes so the ECM can reset itself. That may help.

Computer may have been having difficulty adjusting to the additonal air flow.

Deznutjob · 06-06-2008, 01:51 AM

Quote:

Originally Posted by Mickey

Dan I use AFE instead of an K&N. My truck actually went up from 1.5 to 2mpg. Try computing your mileage instead of the truck's computer doing it. See if there is a difference. I'm not sure why it went down.

This is a hot topic on this forum right now. It has been said that installing an aftermarket intake will actually decrease your gas mileage while adding an exhaust on the other hand will give you better mileage. Installing an intake and an exhaust will pretty much bring you back to where you started.

2008_CrewMax · 06-06-2008, 01:02 PM

i think the K&N just sounds so good .. you tend to put your foot to the floor more so you can hear it, hence worse gas mileage.

Mickey · 06-06-2008, 04:34 PM

Quote:

Originally Posted by Deznutjob

This is a hot topic on this forum right now. It has been said that installing an aftermarket intake will actually decrease your gas mileage while adding an exhaust on the other hand will give you better mileage. Installing an intake and an exhaust will pretty much bring you back to where you started.

I do want to agree with you but on my truck my mpg went up 1.5mpg with just AFE. Borla exhaust gave it a .5mpg increase. This was done several times @ 60mph. Got the same 22.5mpg. Again I'm on flat florida and I don't have any mole hills to go over, just an occasional ant hill.

dan plantz · 06-06-2008, 04:58 PM

thanks for replys thus far. Will disconnect negative cable and will manually compute milage for next tank. However, still would like to know purpose of the charcoal filter in top of air filter box lid and whether removing it will help with non stock air filter use. Driving habits and terrain unchanged, also live in fla. Would like to get this issue resolved as I plan on driving to california in a few months. tks dan

2008_CrewMax · 06-06-2008, 05:00 PM

Quote:

Originally Posted by Mickey

I do want to agree with you but on my truck my mpg went up 1.5mpg with just AFE. Borla exhaust gave it a .5mpg increase. This was done several times @ 60mph. Got the same 22.5mpg. Again I'm on flat florida and I don't have any mole hills to go over, just an occasional ant hill.

22.5?

Jesus christ. Im jealous

ramoine · 06-06-2008, 05:09 PM

The AFE C.A.I replaces all that charcoal stuff , and I don't have any experience with the K&N . But my mileage has not changed .

TexBiker · 06-06-2008, 05:40 PM

Quote:

Originally Posted by dan plantz

However, still would like to know purpose of the charcoal filter in top of air filter box lid and whether removing it will help with non stock air filter use.

The charcoal filter is used to trap fuel vapors that might escape after the engine is shut-off. I don't think it really matters if you leave it in place or not...I doubt it hinders air flow enough to warrant its removal.

06-05-2008, 09:28 PM	#1 (permalink)
dan plantz Junior Member Join Date: Jun 2008 Posts: 2	K&N air filter Have new 2008 tundra with 5.7 engine. Have installed K & N air filter and my gas mileage has dropped 1.5-2MPG around town. All previous use of K&N filters on other vehicles have had opposite results. What is the purpose of the charcoal filter in lid of air filter box. Would removal allow better air flow and mileage with the K & N? Any advice or first hand experience with this problem would be appreciated. tks dan

06-05-2008, 10:47 PM	#3 (permalink)
Mickey Senior Member Join Date: Jan 2008 Location: Jacksonville, Florida Posts: 5,939	Welcome to the site and enjoy your ride. __________________ MIDNIGHT RIDER 07 Crewmax Limited Nautical Blue AVS Bug Shield AFE CAI Borla XS Duals Tundra Weather Mats Trail FX SS Nerf Bars Bully SS Step Bar Reverse Camera Fire & Ice LED Light Bar Herculiner Hellwig Anti-Sway Bar Extang Black Max Eurodezigns HID Lights TRD Shifter XM Satellite Radio Samsung MP3 Locking gas cap DEBADGED DEER SLAYER Back In Action IBTO

06-05-2008, 10:49 PM	#4 (permalink)
Mickey Senior Member Join Date: Jan 2008 Location: Jacksonville, Florida Posts: 5,939	Post some pics also when you can. __________________ MIDNIGHT RIDER 07 Crewmax Limited Nautical Blue AVS Bug Shield AFE CAI Borla XS Duals Tundra Weather Mats Trail FX SS Nerf Bars Bully SS Step Bar Reverse Camera Fire & Ice LED Light Bar Herculiner Hellwig Anti-Sway Bar Extang Black Max Eurodezigns HID Lights TRD Shifter XM Satellite Radio Samsung MP3 Locking gas cap DEBADGED DEER SLAYER Back In Action IBTO

06-05-2008, 11:42 PM	#5 (permalink)
Hawaii 5.7 Super Moderator Join Date: Sep 2007 Location: Hawaii Posts: 1,417	Take the negative cable off the battery for several minutes so the ECM can reset itself. That may help. Computer may have been having difficulty adjusting to the additonal air flow. __________________ 2007 TUNDRA 5.7 CREWMAX TRD 4X4 Revtek 2.5" Leveling Kit, Truxxedo Bed Cover, Billet Grill, Airhorn, Tints, Smoke Inchannel Visors & Bug Gaurd, Flowmaster Muffler w/ Custom Y-Pipe, debadged except for the 5.7's Plus more to come... ALOHA! Remember to search before you start a new thread, and play nicely!

06-06-2008, 01:02 PM	#7 (permalink)
2008_CrewMax Senior Member Join Date: Mar 2008 Location: Southern California Posts: 4,723	i think the K&N just sounds so good .. you tend to put your foot to the floor more so you can hear it, hence worse gas mileage. __________________ White Tundra Club Member #2

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06-06-2008, 04:58 PM	#9 (permalink)
dan plantz Junior Member Join Date: Jun 2008 Posts: 2	air filter thanks for replys thus far. Will disconnect negative cable and will manually compute milage for next tank. However, still would like to know purpose of the charcoal filter in top of air filter box lid and whether removing it will help with non stock air filter use. Driving habits and terrain unchanged, also live in fla. Would like to get this issue resolved as I plan on driving to california in a few months. tks dan

06-06-2008, 05:09 PM	#11 (permalink)
ramoine Senior Member Join Date: Jan 2008 Location: Huntington,Indiana Posts: 4,982	The AFE C.A.I replaces all that charcoal stuff , and I don't have any experience with the K&N . But my mileage has not changed . __________________ 2008 Crewmax X-SP carbon Fiber Dash kit 20" JTI Rims BFG AT KO 285/55/20 AFE C.A.I w/ Dry Pro filter and the AFE Mod Blacked out Headlight Mod. Flo~Pro muffler #744 Toytec 3" front , 1" rear blocks and Diff. lowering kit

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