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Old 03-05-2010, 09:36 AM #61
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I did the HCF delete, but I have yet to notice a bit of difference in get up and go or fuel economy.

There is no doubt that the filter is restrictive, but I think the gains may be so minimal I'm not noticing them. *shrug*
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Old 03-05-2010, 03:49 PM #62
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Quote:
Originally Posted by sheik View Post
I did the HCF delete, but I have yet to notice a bit of difference in get up and go or fuel economy.

There is no doubt that the filter is restrictive, but I think the gains may be so minimal I'm not noticing them. *shrug*
I'm with the same agreement as you! I believe it's due to the large surface area of the filter it allows much more air to be brought in versus if we had a smaller filter just allowed just enough air in.
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Old 03-05-2010, 06:43 PM #63
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Quote:
Originally Posted by chayos00 View Post
I'm with the same agreement as you! I believe it's due to the large surface area of the filter it allows much more air to be brought in versus if we had a smaller filter just allowed just enough air in.
I think it only applies to the V8's. I think i gained 1hp. LOL
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Old 04-13-2010, 06:58 PM #64
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After having my filter out for over a month I've seen a maybe a 1 MPG increase. I always go to the same gas station, and drive extremely close to identical routes each week which keep the variables down. I've been tracking my MPG for about 6 months now, all MPG tracking has been done by hand too. Also no increase in noise either inside or outside even with the heat/AC and radio off.
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Old 04-13-2010, 08:21 PM #65
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i finally got a decent interstate run of 1200 miles. 24 MPG with my stock '07 v6 Sport.
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Old 05-07-2010, 09:32 PM #66
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not too long ago i purchased an 05 sport edition and i'm glad i found this site. i was looking for some free 'mods' for my engine and found this thread. i will be removing my hydrocarbon filter tomorrow. i don't think it will give noticeable power but i figure why not...i may gain a horsepower or two...

anyways, i see a lot of people on here wondering and claiming that you can get better gas mileage from removing it. i see confusion all the time about intake products and mods that will supposedly give you better gas mileage.

we can all agree that the hydrocarbon filter is restrictive to some degree (maybe insignificant but maybe not). we can all agree that because of the restriction there is a pressure drop across the filter. any pressure drops in the intake system means less air molecules into the combustion chamber during the intake stroke which means less power. so most people figure that by reducing the pressure drop in an intake (such as by removing the hydrocarbon filter) that you would in turn gain fuel economy (maybe an insignificant amount or maybe significant).

this idea is completely wrong. remember, the engine power and the amount of fuel that is combusted is regulated by the throttle / butterfly valve. the throttle intentionally creates a pressure drop. so any reduction in pressure drop through the intake system caused by removing the hydrocarbon filter would mean that your right foot would simply be slightly less on the gas pedal for any particular speed. the free-er flowing the intake, the more closed the throttle will be. there is no impact to gas mileage.
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Old 10-10-2010, 08:58 PM #67
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Got bored, just did it to mine. Figured it can't hurt, especially after looking at it and realizing how thick it was.

Guess the gas mileage numbers will tell, I doubt I'll notice anything in the power department.
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Old 10-11-2010, 03:27 PM #68
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Actually, the fuel is regulated by the PCM within a closed loop (feedback) system consisting of the throttle position, O2 sensors, engine load, air temp, etc. (after warm up)

But putting more air into the engine doesn't equate to better mileage...In fact, it should be the opposite. To keep the proper air/fuel ratio the PCM will add more fuel if it senses more oxygen via the closed loop feedback. More air could equate to more power though.

I've heard that the internal combustion engine is nothing more than an air pump. So, by 'freeing up the airflow', it doesn't have to work as hard to move the air in (or out...free flowing exhaust)...thereby allowing the engine to work more 'efficiently'. I believe that's where the 'improved' mileage would come from with everything else being equal.
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Old 10-11-2010, 08:55 PM #69
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Well I pulled mine last weekend and I'm showing about 2-3 mpg more than before, whether my meter/indicator is telling the truth or not, is another story. After the next fill up I plan on doing some calculations.

btw at highway speed (60mph) I was hitting 23-34 mpg?!?!! Is this even possible?
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Old 10-11-2010, 09:17 PM #70
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btw at highway speed (60mph) I was hitting 23-34 mpg?!?!! Is this even possible?
I hit 31mpg @ 105mph. w00t!
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Old 10-24-2010, 02:48 PM #71
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I have an 04 v8 that i am thinking about doing this too. Will it cause me to fail the CA smog emissions test that i have to pass every year before i register?
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Old 12-26-2010, 12:12 AM #72
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Quote:
Originally Posted by wetwilly17 View Post
we can all agree that the hydrocarbon filter is restrictive to some degree (maybe insignificant but maybe not). we can all agree that because of the restriction there is a pressure drop across the filter. any pressure drops in the intake system means less air molecules into the combustion chamber during the intake stroke which means less power. so most people figure that by reducing the pressure drop in an intake (such as by removing the hydrocarbon filter) that you would in turn gain fuel economy (maybe an insignificant amount or maybe significant).

this idea is completely wrong. remember, the engine power and the amount of fuel that is combusted is regulated by the throttle / butterfly valve. the throttle intentionally creates a pressure drop. so any reduction in pressure drop through the intake system caused by removing the hydrocarbon filter would mean that your right foot would simply be slightly less on the gas pedal for any particular speed. the free-er flowing the intake, the more closed the throttle will be. there is no impact to gas mileage.
I suspect this conclusion is the most correct. The throttle is what (by design) governs restriction of air to gasoline engines. Until you get to the point that the throttle is no longer the bottleneck (maybe as low as 30% throttle at low RPMs where the engine can't digest much air) everything else on the induction system doesn't come in to play. We have modern fueling systems that can maintain a given air/fuel ratio under all conditions to thank for this. It's only when you need more power than the engine can provide at a given RPM and airflow which either results in the ECU enriching the mixture (many engines drop the air/fuel ratio from the standard ~14.7:1 to something in the ~13:1 or even richer at high loads for best power and reduced knock at the expense of fuel efficiency) or shifting the transmission and increasing the RPM, that a flow restriction such as the filter negatively affects MPG.

I may pull this filter tomorrow just to see what I get on longer trips to see what real world results I see.
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Old 01-07-2011, 06:21 PM #73
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After doing this I can't notice any difference in power and I have yet to see any change in fuel economy even closely tracking it via my ScanGaugeII on the same highway at the same speeds under the same conditions.
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Old 02-21-2011, 12:11 PM #74
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Quote:
Originally Posted by OrdnanceMarine View Post
After doing this I can't notice any difference in power and I have yet to see any change in fuel economy even closely tracking it via my ScanGaugeII on the same highway at the same speeds under the same conditions.
I kind of figured this might be the case. I'm guessing that others who think they reallized some gain (many of which were extreme at 2-3 mpg) were paying more attention than normal to the onboard readout and thus were driving easier than normal. As stated before, the intake really isn't a bottle neck and even if you can get more/colder air into the combustion chamber the computer will still look for the target a/f ratio and hit it by adding MORE fuel.
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Old 02-25-2011, 08:19 PM #75
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About 1% louder but no difference on fuel economy or power.
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