No matter how tenderly I drove my Tundra DC SR5 TRD 5.7 I could never get consistently above 13.6 - 13.8 mpg in town. Wasn't too worried about it as it's only got 4700 miles. Figure it needs to loosen-up a bit with some more run time. Besides, it sure beat the 8 or so mpg I had been getting for the last 5 years in my Ford Beast.
But looking for cheap and easy mods, and this one fits the bill, I removed the HC and disconnected the battery for a bit. Touched the neg cable to the positive before hooking it back up. The engine died after the first start so I figured I had the ECU reset. Second start she was ready to go.
Been getting 14.2 to 14.4 around town for the last 2 days. Seems like this mod does something good - even if a small step. My engine is idling lower by 150 to 200 hundred rpms. And I'm damn sure the throttle response is a bit crisper. I have to be very very easy on the throttle now or she just jumps off the line from a dead stop.
No matter how tenderly I drove my Tundra DC SR5 TRD 5.7 I could never get consistently above 13.6 - 13.8 mpg in town. Wasn't too worried about it as it's only got 4700 miles. Figure it needs to loosen-up a bit with some more run time. Besides, it sure beat the 8 or so mpg I had been getting for the last 5 years in my Ford Beast.
But looking for cheap and easy mods, and this one fits the bill, I removed the HC and disconnected the battery for a bit. Touched the neg cable to the positive before hooking it back up. The engine died after the first start so I figured I had the ECU reset. Second start she was ready to go.
Been getting 14.2 to 14.4 around town for the last 2 days. Seems like this mod does something good - even if a small step. My engine is idling lower by 150 to 200 hundred rpms. And I'm damn sure the throttle response is a bit crisper. I have to be very very easy on the throttle now or she just jumps off the line from a dead stop.
Thanks for posting this mod. I like it!
Your truck now idles lower? I doubt that... I think you just never really paid attention to it before.
Your truck now idles lower? I doubt that... I think you just never really paid attention to it before.
Ahhh! A doubting Thomas!
Yeah, I pay attention. So blow me.
Currently the tach needle is riding just off the top of the 500rpm line - at probably 600rpm or so. The needle used to run at half-way between 500 and 1000 before - which I considered to be a bit high, but lived with. And yes, this is with the engine at operating temperature.
Now does this seem odd? Yeah. And I have no idea why it is so. My guess is it's whatever changes have taken place because of the ECU reset - not necessarily the removal of the HC filter. Or maybe a combo of the two. I don't know. But, the engine idles fine, and nice and smooth. Gas mileage is up a bit. I can live with it just fine.
rone doubts every one. My test was none on the same streach of road at same speed on cruise. This could be wishfull thinking but today I got 18.2 again. Come on wishfull,And I want to thank you for this mod.
rone doubts every one. My test was none on the same streach of road at same speed on cruise. This could be wishfull thinking but today I got 18.2 again. Come on wishfull,And I want to thank you for this mod.
It's true, I'm very doubtful of people's perceptions. Taking a few stats classes, learning about blinding and double-blinding experiments, and seeing placebo experiments take place has completely destroyed my belief in personal accounts of changes.
Currently the tach needle is riding just off the top of the 500rpm line - at probably 600rpm or so. The needle used to run at half-way between 500 and 1000 before - which I considered to be a bit high, but lived with. And yes, this is with the engine at operating temperature.
Now does this seem odd? Yeah. And I have no idea why it is so. My guess is it's whatever changes have taken place because of the ECU reset - not necessarily the removal of the HC filter. Or maybe a combo of the two. I don't know. But, the engine idles fine, and nice and smooth. Gas mileage is up a bit. I can live with it just fine.
Woah, easy killer. I wasn't meaning that as an insult or attack, just meaning that after putting time (or in other cases, money) into a mod, people watch things significantly more closely than they did before hand because they want to see what they just accomplished. This often ends up in incorrect analysis of data, because they never accurately monitored the data prior to the mod.
Case-in-point; several years ago I was part of an RX7 forum and someone installed a CAI on their car and was then posting about how much better it was and how he got more power, better gas mileage, etc. He also mentioned that cruising on the interstate his car ran 500 RPM's lower... with a manual transmission... It was pointed out that he probably was imagining things, but he 100% believed that his car was running a lower RPM and tried to convince everyone of it - then someone explained how a transmission works to him.
It's true, I'm very doubtful of people's perceptions. Taking a few stats classes, learning about blinding and double-blinding experiments, and seeing placebo experiments take place has completely destroyed my belief in personal accounts of changes.
All that said, I still removed my carbon filter.
If this were a designed experiment we could think of it as a fractional factorial with the main effects (HC removed and ECU reset) aliased. Its like a 2^2-1 if such a thing existed.
That being said I happily removed my HC thing, reset the ECU and thought about the better gas mileage and throttle response while driving it.
I am convinced this mod works. I mostly drive stop and go, barely ever long distances, and have NEVER averaged even close to 14 mpg on a full tank, usually 12.5mpg - 12.7mpg in the winter and 13.2 - 13.4 the rest of the year . I've always payed attention to the mpg and I reset my mpg calculation after every fill-up. I was recently looking into getting a AFE CIA for some increased mpg, response, sound etc. So I thought I'd give this mod a try before pulling the trigger on a new intake, after all its free and I was going to remove the stock one anyway, so what could it hurt? Anyway, after removing the carbon filter and disconnecting the battery, I have been averaging 15.3mpg - 15.5mpg, on my last 2 1/2 tanks with the AC usually on and driving the same way I always do. I did notice with the first couple of days after the mod the mpg readings were all over the place, but since then it has leveled off and stayed pretty consistent. The throttle response has been improved slightly and I haven't noticed the exhaust being louder, however the engine is a bit louder at higher RPMs. Now with this mod, no CIA for me.
__________________ 2007 Tundra 5.7L SR5 4X4 DC Long Bed Black UWS Black D-Plate Tool Box - 18in TRD Alloy Wheels - DeBadged - Wade Vent-Visors - Black Westin 4" Oval Nerf Bars Sirius Satellite Radio
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.
But Rone, Jedi mind tricks do work, I do them all the time and the Tundra is no exception. With the proper training a Jedi can make their truck get 20-25 mpg.
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2007 Salsa Red Limited Crewmax
Nav, Sonar, 20" Carved Wheels
Born in TEXAS Built by TEXANS
aFe Stage II Pro-S Dry Si
Corsa Sport Single Cat Back Exhaust
There's no way to fully prove the utility of this mod, because everyone is also resetting their ECU's as part of the process. I don't doubt that some people drive consistent routes so as to let them gauge their mileage pretty accurately, but you can't say if this is just due to the HC filter removal or the ECU reset.
An interesting experiment would be to stick the HC filter back in after the ECU reset, and see if the mileage drops again.
I have reset my ECU several times and it made no difference on my mileage, it always goes back to what it was within a day or two, so that concept is not valid at least for me. Also my driving route is pretty much identical day to day.
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07 Tundra DC TRD 4WD 5.7L Desert Mica
I did this Mod with only 650 miles on my new truck, I have only driven about 14 city miles up and down hills since the mod 2 days ago but my computer is already showing an increase of .6 mpg . I drove my daily route I always take, I will post updates as I log more miles. Any truth to the rumor that mileage will increase as I "break in" my truck ?
I have reset my ECU several times and it made no difference on my mileage, it always goes back to what it was within a day or two, so that concept is not valid at least for me. Also my driving route is pretty much identical day to day.
Resetting the ECU doesn't improve mileage. They reset it so the computer can adjust for the added airflow so burning the fuel can be more efficient. If you drive the same path everyday and you don't vary how much you put your foot on the pedal you won't see a difference in mileage increase. If you don't believe resetting the ECU does anything different try adjusting your driving and gas it at every stop. Your truck will learn and you will get less.
I give it enough gas to where my truck shifts just under 2k rpms. Then I set my cruise. Before this mod I was getting 17.5 mpg on the computer and by my math. Now that I removed the HC I get 19 mpg.
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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
Just to clarify...You misunderstood me, I was defending the concept that my mileage HAS gotten better by ripping the fish tank filter out of the airbox. Zuhkov was implying that the better mileage was unproven because many of us have reset the ECU so as not to give the credit to the removal of the filter. In my case the mileage is better since ripping out the fish tank filter.
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07 Tundra DC TRD 4WD 5.7L Desert Mica
Re: 19.8mpg after HC removed!
Linear Mode
