If the mod is not CARB approved it most likely is no legal in Ca.
It's not legal - period. Tampering with emissions equipment is against federal law anywheres in the country.
That being said, I doubt anyone doing underhood inspections, even in Cali, will take the time to take apart your airfilter box. As long as everything is there visually from the outside you're fine.
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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 have done mod like results.I would like to hear from trailer towers to see if it helps in the higher rpm range.
Hi Charlie
We went out camping this weekend and I read this thread just before I left but didn't have time to do the mod before we left home. While at the campsite I pulled the filter out and disconnected my battery.
Going home pulling with this truck was an absolute dream!!! I noticed a huge gain in pulling ability at wide open throttle pulling hills. Fuel economy is a little lower than normal pulling my trailer 10.3 MPG vs 11MPG but this was a much tougher trip than normal. My gross weight was 14,124 pounds and there are plenty of 6 - 9% grades to pull where we were camping. The temperature was also 28-30 deg C. I have always been quite satisfied with my mileage but hopefully this will increase it - 22-24 MPG(Imp GAL) when empty on the highway and 11MPG(Imp GAL) when towing my trailer.
I have 19,000 KM on this truck and this is the first time I have reset my computer so I don't know for sure if it is the removal of the HC filter or the reset?
There is NO way removing the carbon filter increased your fuel mileage by that much. Absolutely no way. I think you subconsciously biased your test by wanting to get better mileage and thus changed your driving habits to see how good of mileage you could get after this mod. This is a very common bias in all experiments, and is one of the very fist things you discuss in epidemiology and statistics courses. Short of doing a "blinded" experiment, everyone is going to notice an increase in throttle response because that's what they think they're supposed to notice. Just like giving a placebo.
FYI, we are here to tell and share what we found out and not demanding you to not to believe on what we claimed. There isn't much science to figure things out to run and be more efficient than what it suppose to be. This is about mechanical and some thinking that will make sense. If you dont believe it, fine. I will strongly suggest not to read this articles and start your own.
I did the mod last thursday and without a doubt in my mind it has improved throttle response and power. Not a huge difference but you can tell it's there.
I did not show any improvement in milage as yet but have only put on about 100 miles and I did not reset the ecm yet.
I've tried the drop in K & N filters with a stock airbox on previous vehicles & been disappointed. This is a great modification.
For all: (optional)
I am reminding everyone that did the mod to keep there charcoal filter or fish tank filter before having your next smog test and reset your ecu days before the test. And also replacing the stock air filter with a performace filter (ex. K&N, AFE etc.) to not to over oiled the element for MAF sensor failure might or will occure. That is why I myself will get an AEM drop-in air filter. Again, guaranteed results for everyone will totally not to be the same for driving behavior and driving conditions, but should notice a diffrence. Enjoy while we can.
Last edited by MechEng1; 06-30-2008 at 05:13 PM.
Reason: .
Thank you Redram99 , I would like a 1 mpg if possable but if not my empty milage is now fantastic. People can doubt this mod if they want but I'm a believer.
FYI, we are here to tell and share what we found out and not demanding you to not to believe on what we claimed. There isn't much science to figure things out to run and be more efficient than what it suppose to be. This is about mechanical and some thinking that will make sense. If you dont believe it, fine. I will strongly suggest not to read this articles and start your own.
If you'd read the rest of the replies, and not single one out, you'd notice that I said I did remove the carbon filter on my truck. And if you'd read the rest of the replies you'd see that I'm not doubting improvements from this mod, just massive improvements.
How important is reseting the ecm? What will happen if I don't and just take out the charcoal filter? And to reset the ecm is it as easy as pulling off the battery cables for a few minutes or is there more to it? I have an 07' double cab with 5.7L.
Resetting the ECM erases the computer memory and lets it sense all that freed up air flow you just created which makes the engine work more efficiently. Yes thats all you do is disconnect the battery cables, only the negative one though.
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2007 DC SR5 4x4 4.7
De Badged
All Weather Floor Mats
Painted Wheels
1 3" core 26" power stick mufflers
N-fab pre-runner light bar
Satin Black Head Light Mod
wont the computer sense the change after about 300 mi. if you dont disconnect the battery? i pulled my charcoal filter out about 2 weeks ago and noticed better throttle response instantly. i havent disconnected the battery yet. if i do the battery reset do you think i will notice even more improvements.
I am also skeptical about the need to disconnect the battery. Sometimes rumors get started via internet gossip and they stick around so long that everyone assumes they are fact. Too bad we didn't have input from control systems engineers from Toyota to get the straight goods. That being said, it is important to keep an open mind about such things. Besides, it is not a huge deal to disconnect the battery and then see if there is improvement.
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.
Re: 19.8mpg after HC removed!
Linear Mode
