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TundraGeneral discussion forum for the 2007 and later Toyota Tundra.
This is a discussion thread titled "19.8mpg after HC removed!", within the Tundra forum, part of the Truck Forums category.
As what on the title said an 19.8mpg has achieved after removing just the HC charcoal filter and using a stock air filter. Did not even shave the ribs inside the upper lid box. This has been only tested for under 100 miles, but I usually get around 18.3mpg before going 75mph on a highways. As far as acceleration, it got better response. And it has a bit throaty sound too.
As what on the title said an 19.8mpg has achieved after removing just the HC charcoal filter and using a stock air filter. Did not even shave the ribs inside the upper lid box. This has been only tested for under 100 miles, but I usually get around 18.3mpg before going 75mph on a highways. As far as acceleration, it got better response. And it has a bit throaty sound too.
This has to be one of the best free mods you can do for mileage and power.
Just be aware that the ecm may try to fight you on this. I highly recommend disconnecting the battery to allow new long term fuel trims.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
This has to be one of the best free mods you can do for mileage and power.
Just be aware that the ecm may try to fight you on this. I highly recommend disconnecting the battery to allow new long term fuel trims.
If the battery is disconnected how long does it need to be disconnected for? What will need to be reset after connecting and startup? Just the clock, radio presets etc?
Have any check engine lights been thrown up after doing this mod?
If the battery is disconnected how long does it need to be disconnected for? What will need to be reset after connecting and startup? Just the clock, radio presets etc?
Have any check engine lights been thrown up after doing this mod?
I usually wait 10 minutes before reconnecting the battery, but if you remove the neg terminal and touch it to the positive it should fully discharge the ecm caps right away unless they put in a series diode for protection of the ecm. In general I'd recommend 30 minutes to be on the safe side. The only things to reset are the clock and the radio presets. The TPM system will re-learn the pressures automatically.
I haven't seen any CELs so far from anything I did.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
If the battery is disconnected how long does it need to be disconnected for? What will need to be reset after connecting and startup? Just the clock, radio presets etc?
Have any check engine lights been thrown up after doing this mod?
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Just like the moderator said. After removal and installation I disconnect the positive(+) pole from the battery for about 5 minutes or so, and reconnect the cable back again. All that I reset is my radio presets and that was it. So far no check engine light comes on after this mod. I am so glad doing this simple mod and help a little on our MPG on this ridiculous price for gas for our V8's.
Last edited by MechEng1; 06-24-2008 at 04:03 PM.
Reason: .
I just bought a new TRD cai and it too comes with the charcoal filter.. Anyone try this yet with the TRD CAI.. I've only driven 40 miles so far and disconnected the battery while installing it. Have not noticed any difference yet. Time will try. But, I'm wondering what would happen if I removed the filter ???
I just bought a new TRD cai and it too comes with the charcoal filter.. Anyone try this yet with the TRD CAI.. I've only driven 40 miles so far and disconnected the battery while installing it. Have not noticed any difference yet. Time will try. But, I'm wondering what would happen if I removed the filter ???
I know two other people with the trd cai. I convinced one of them to remove the HC screen and he noticed about 1 more mpg. The HC screen is there solely for emissions purposes. If it's intended to not let HCs through, then logic would dictate it would be impeding regular air from getting through as well.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
I removed the charcoal before / while installing the TRD cai. No appreciable gains. However, the truck was brand new and only had ~1000 miles on the clock when upgraded.
I just removed mine from my TRD CAI. I doubt I'll hear any change in sound (already have that beautiful Corsa sound)... but I'd be happy with a little better throttle response and any mpg gain would be welcome too.
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. 2007 TUNDRA 5.7L SR5 TRD 4x2 Double Cab, Salsa Red Pearl
TRD CAI, Corsa Sport Side Exit Dual Tip Exhaust, Stebel 300Hz Air Horn, OEM Tundra Mud Mats, Black powder-coated side-step bars, Ventshades, Line-X, TRD Sway Bar, Blacked headlights surround, White LED guage and dash lights, Viper 771VXR Remote Start / Alarm, Carriage Works black billet grille with logo remount (awaiting install).
I removed the charcoal before / while installing the TRD cai. No appreciable gains. However, the truck was brand new and only had ~1000 miles on the clock when upgraded.
It could be your truck is still too new to feel any smaller gains. My truck is just barely starting to loosen up and I have 2700 miles on my truck so far. Most people will not notice much of a difference from the HC screen removal. There maybe more physics involved in the whole equation than we can explain - the trd intake's top section is taller and might be less sensitive to the HC screen being there due to the increased internal volume. There may be other factors contributing to the HC screen's effects on airflow other than being a static airflow restriction. Some have argued it having a straightening effect on the air going into the MAF sensor tube. If anything I think it diffuses airflow rather than directing it, so there can't be any performance benefit to having it there other than to keep the treehuggers happy. So if you don't have any visual underhood inspections in your area, you might want to consider pulling the screen out. If you remove it carefully enough, you could easily reinstall it later if greenpeace gives you a call
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
So I have almost 14800 miles on my truck. I'm getting about 13.5 in the city with my guard and tires. I have no idea what I'm getting on the highway (no OBC) so that's a cr*pshoot.
Now, if I were to take my screen out, would I have to put it in before my 15K miles service? I plan on doing it AFTER that, but before I take my roadtrip 900 miles. Basically, do you need to pop it in before servicing?
Is it as simple as literally just popping those 4 clips, pulling out the airfilter and taking the HC filter out? Is it under the airfilter? I haven't taken it apart yet, but is it easily assessable or do you have to bend/work that tubing to get the box lid high enough?
-rockstate
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2007 Toyota Tundra 5.7, 4x4
Rhino Liner, Borla Exhaust,
Ranch Hand Grille Guard,
BFG AT KO 285/65/r18
Basically, do you need to pop it in before servicing?
Is it as simple as literally just popping those 4 clips, pulling out the airfilter and taking the HC filter out? Is it under the airfilter? I haven't taken it apart yet, but is it easily assessable or do you have to bend/work that tubing to get the box lid high enough?
-rockstate
The most foolproof way of removing it is to drill out the small dimples of molten plastic around the perimeter of the HC screen (top filter housing - impossible to miss). 1/4 inch of drilling is all it takes per dimple. If you look at the picture, you'll see the 8 holes around the outside of the screen which were drilled out.
I doubt anyone will be looking inside the top of the airbox when replacing your air filter. If you're concerned about it, you can get some small short black round headed sheet metal screws to make it removable after drilling it loose. Of course you'll have to remove the hose clamp, unplug the MAF sensor and unclip the harness from the top of the airbox to pull it off in order to have a clear shot at the screen and to clean up any residual plastic from the removal process.
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2007 Tundra 5.7 4x2 RCSB slate metallic
2005 Corolla - all stock, cause it's the wifes
1986 Mustang GT - the stereo is under the hood
1990 Corolla - cause it was really cheap
19.8mpg after HC removed!
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