Air Filter Box Contraption

[BStarr119]

I noticed a drop in highway MPG's witht the magnet removed so I put it back in for a road trip tomorrow. Also the engines computer reacts differently based on how quickly you press the pedal. Try slowly pushing the pedal to the floor vs as fast as you can and you get the same basic result as the mod IMO of course haha.

 

[DRS]

I noticed a drop in highway MPG's witht the magnet removed so I put it back in for a road trip tomorrow. Also the engines computer reacts differently based on how quickly you press the pedal. Try slowly pushing the pedal to the floor vs as fast as you can and you get the same basic result as the mod IMO of course haha.

Good observation. How much drop in the mpg? I am thinking that light load on highway, the air goes the direct path from the split scoop on top of the radiator the right side, has a small diameter closer path that the dinky filter right behind the radiator filters the air.. Maybe with flapper gone or open, some weird air condition happens when air is drawn through the larger box at the side during light load while driving on highway.. Total guess on my part. The left side of the split air scoop on top of radiator (we are talking first gen V8 here for those with second gen) winds its way to the large filter and piping into the motor. Long piping, many sharp turns, not efficient. I have no idea what they engineered this the way they did.

The 2015, will pull the braces off next weekend... I wonder how much torque those bolts are supposed to have on them? U less someone knows, will have to play "load the torque wrench game to unbolt.. Lowly working the torque settings so no clicks and it turns the bolt. That will be the setting to tighten.. Total guesswork unless find the exact setting. Will take a look around and might do something with the assumed duel flappers on the V8.

 

[Alwaysforward]

Just checked the manual and found no torque settings required for the braces. Check under the hood to see if they stamped the settings on the bars themselves.

 

[rocky-mountain]

For those saying they've experience a drop in fuel economy since removing the flap, I think there is a very simple explanation to this. Because you've removed the flap, you've been a little heavier with your foot on the throttle because you want to see if you can notice any difference. You also like the feel of that little bit of extra throttle response so you're driving style after the modification has caused you to be a little more playful, perhaps a little more aggressive. I know that was the case for me. But now that the novelty has worn off, driving back to normal, I see absolutely no difference in fuel economy. So a drop in fuel economy is the cause of you, the driver having a little more fun.

 

[craigt]

For those of us that have made a modification, it was never about WOT performance. It was about getting rid of the lag, usually at a rolling stop, when you first step on the throttle. A lag that many blame on transmission programming, but is really due to the engine not quickly building rpms, because it can't breath.

I'll be the outlier. I disagree.

I did the gorilla tape method and ran a basic test.

1. Rolling to a near stop with the car in Drive. Hit the gas. Waited, waited, waited. Then took off.

2. Rolling to a near stop with the car in 1. Hit the gas. Took off immediately.

If it was the a "breathing" issue, I would have seen the issue in both tests and clearly did not. To me, this points to the transmission sluggishly shifting from 3 to 1 to get going. Or the engine mapping changes when in D vs. manual. Either way, it seems to be programming. Throttle response otherwise is very good (better with the mod).

I may try more ways of modifying the magnet and/or flapper and do the above experiment again.

 

[amartz]

I'll be the outlier. I disagree.

I did the gorilla tape method and ran a basic test.

My turn to disagree. When you force the transmission down to 1, you are also forcing the rpms higher than they would be otherwise. This means the engine is already breathing, and probably has the flap already open *before* you hit the gas. How much gorilla tape did you put on, and can you tell by manually lifting the flag that it's not pulling closed as strongly as it was before? Some recommend removing the flap altogether. If you can just unbolt it, get it out of the way, and try it then. See if it's any different that way.

But I still think the long time before downshifting is because the transmission is waiting for the engine to build up enough rpms and torque to be worth downshifting for.

 

[DRS]

Just checked the manual and found no torque settings required for the braces. Check under the hood to see if they stamped the settings on the bars themselves.

Thanks for tip.. Will check.

 

[craigt]

My turn to disagree. When you force the transmission down to 1, you are also forcing the rpms higher than they would be otherwise. This means the engine is already breathing, and probably has the flap already open *before* you hit the gas. How much gorilla tape did you put on, and can you tell by manually lifting the flag that it's not pulling closed as strongly as it was before? Some recommend removing the flap altogether. If you can just unbolt it, get it out of the way, and try it then. See if it's any different that way.

But I still think the long time before downshifting is because the transmission is waiting for the engine to build up enough rpms and torque to be worth downshifting for.

The RPMs while driving 3mph is virtually the same in 1 as any other gear the transmission may be in. When keeping the gear selector in manual, I do notice that the transmission rarely ever goes into 2 while slowing down. It stays in 3 until almost a complete stop, and then moves directly into 1. When using the manual selector to downshift, the time it takes me to downshift from 3 to 1 is about the same amount of time of the delay when hitting the gas from an almost complete stop (ie. the programming to shift from 3 to 1).

I will remove the flapper one of these days and try it out. I put on 4 or 5 layers of tape and did notice an observable decrease in resistance.

 

[Top Gear]

BTW, have any of you with Sedans verified you have the "carbon" filter I've talked about?? We know some Sedans have it, but I'd wager they all do. It should be right next to/on the other side of the paper filter when the airbox is closed, or it will be a smaller downstream screen thingy. It will make a far bigger difference in power, response and mileage than this upstream flap.

 

[dxtra196]

I think removing the magnet is the way to go , I see no point in decreasing the strength. Less force to get it open, close when u at a stop or highway cruising. I think Hyundai just wanted a smooth acceleration instead of instant power

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[DRS]

BTW, have any of you with Sedans verified you have the "carbon" filter I've talked about?? We know some Sedans have it, but I'd wager they all do. It should be right next to/on the other side of the paper filter when the airbox is closed, or it will be a smaller downstream screen thingy. It will make a far bigger difference in power, response and mileage than this upstream flap.

2012 5.0 does not have the carbon filter in the large air box. Only paper. There is also small paper filter in the smaller air box (draws air from top of radiator). Have not pulled the bars off to get into the two 2015 air boxes. Your suggestion migh be in those.

 

[RN2X]

I just removed the magnet and replaced the little clip. I was only able to do a quick run down the street but it certainly felt like the pause was a lot shorter and less pronounced. I will take it for a better test later this evening.

 

[Top Gear]

2012 5.0 does not have the carbon filter in the large air box. Only paper. There is also small paper filter in the smaller air box (draws air from top of radiator). Have not pulled the bars off to get into the two 2015 air boxes. Your suggestion migh be in those.

Ah ha! Two paper filters in your '12? One of them might be the culprit.

Thanks, DRS. I've done a lot of recent googling on the Sedan and just can't find the answer, so that's why I'm asking. On the Coupe, it's so easy to find the secondary filter, which is the same size as the paper one and made of a grey fiberglass-like material, much like insulation. Someone here with a 4.6 says his had one of these EPA filters, and someone else with a 3.8 did, too. The 5.0 might satisfy the EPA recommendation by using those two paper filters you mentioned.

So, just being simple-minded about it, only one replaceable paper filter is necessary to actually filter the air - the other is unnecessary

Any of you, please let us know what you find out about yours...

Oh, and I will probably see one of my knowledgeable dealer mechanics at an event tomorrow, so I'll ask him.

 

[amartz]

There is also small paper filter in the smaller air box (draws air from top of radiator).

Really? I don't recall anything like that on my 3.8. I'll have to go take another look...

 

[DRS]

Really? I don't recall anything like that on my 3.8. I'll have to go take another look...

Do not remember V6 set up. I am speaking above (and noted) the 5.0... Let us know what you find.

 

[Top Gear]

BTW, I spoke to the mechanic and he didn't know. In fairness, they rarely if ever deal with these filters. He didn't even know mine was removed and he works on my car

 

[amartz]

Do not remember V6 set up. I am speaking above (and noted) the 5.0... Let us know what you find.

I looked, and didn't see anything. From over top of the radiator, there is open ducting down the left hand side (as you stand facing the radiator) that goes straight to the airbox. I'd be interested to see a picture of the filter on your car.

 

[DRS]

Really? I don't recall anything like that on my 3.8. I'll have to go take another look...

Sorry.. Using iPad with both Safari and Opera, cannot attach pics of the filter at this moment. Weird. Crash Opera browser when using the attachment symbols, or manage attachment button.

 

[amartz]

Sorry.. Using iPad with both Safari and Opera, cannot attach pics of the filter at this moment. Weird. Crash Opera browser when using the attachment symbols, or manage attachment button.

Try Ubuntu or Andriod... ;-)

 

[DRS]

Try Ubuntu or Andriod... ;-)

Good point.. Used to use TapTalk all the time. Worked great.. Including uploading pics for posts. Sal says his integration to TapTalk is toast. Never to return.