Cowel hood or side panel air scoop?

[Ghost10]

I've been wondering if a hood cowel or air scoop (but unless air intake is attached might be for looks so) what about where the air intake box meets the Renee on the passenger side , we cut a hole and add a side air scoop? I guess that would look silly only having a side fender scoop on one side only....?

 

[STORMIN08]

Not sure what you are looking to gain, but I generally trim the air box itself to open in the forward panel, intaking air from around the headlight area.

 

[gat0r]

been lookin for a cowl hood, myself... seems no love for our K2xx platform
(not a stick on one)
called/emailed a few places... no interest

& i dont know if id go as far as pic above,
but i opened up the fender & airbox , as below & put a k&n filter in

NORCAL SS Intake Box mod for 5.3/6.2

Been doing this set up for the guys that want a little more bump without spending $$$. Replace oem filter with green filter or k&n and then do this mod. Very easy and MUCH more air coming in. Remove stock intake box and you have this small entry for air get a screwdriver and pop off the...

www.tahoeyukonforum.com

(fyi, the stock airbox w/ high flow filter should support up to 600-ish HP)


this is area to trim opening to make sure you get all you can into intake (sorry sucky pic)

https://www.tahoeyukonforum.com/attachments/20160517_163714_sm-jpg.346866/

this is how much i cut out to match

https://www.tahoeyukonforum.com/attachments/20170325_125326-jpg.346865/

 

[gooffeyguy]

Another thing to check, I know this was on my 2012 but may not be on the 2015+, is the inner fender above the front of the wheel well where the air enters from the outside. Mine has louvers cut into the sheet metal, so there is a limited amount of air that can enter that area also and may become the restriction.

I noticed this when I had the front bumper cover off and changing out the headlights. It was only on the passenger side. So no matter how much you open the plastic airbox, the air is limited by these....

 

[Joseph Garcia]

It appears that you are implying that there is some type of restriction in the flow of air coming into the truck with the stock air intake system, that is potentially limiting the maximum throughput from your stock motor. I personally do not believe that this is an issue.

You can make cutout mods in the intake air system, and it will generate different and most like louder sounds, but IMO, it will not result in any significant additional throughput from your stock motor.

 

[STORMIN08]

Go read the air intake thread a few down from this...black bear did some testing of I takes...

Yes the factory does restrict and that thread has dyno proven evidence...then add actually driving and moving air...it will get slightly better even yet.

 

[gooffeyguy]

The ones that gained anything leaned out the engine and created spark knock and would need to be tuned by either adding more fuel or reducing spark, which would lessen the gains and you'd be back to square one.

Except you'd gain a lighter wallet after dropping the coin on the air intake system and a custom tune, and maybe pick up ~2-3hp

 

[STORMIN08]

Does that not prove the point....showing that they indeed do flow better.

Not saying the won't/didnt/can't make gains...but it simply shows flow is improved.

 

[gooffeyguy]

I don't really know what it means, because technically the Mass Air meter should detect any additional flow and correct the fuel accordingly. Same with the Air Intake Temp sensor if the air was warmer or cooler.

 

[STORMIN08]

I know in my case...highly cut up stock air box (done simply to see if any changes were noticeable)...I have not see any drop in meage due to large tire and lift...but it did cause a dead spot in the pedal and I have retarded timing by 2 degrees with the use of my Diablo.

It did start to ping at high way speeds when trying to excelerate. Now that was in the lousiana summer time...100 plus degrees.

 

[swathdiver]

It appears that you are implying that there is some type of restriction in the flow of air coming into the truck with the stock air intake system, that is potentially limiting the maximum throughput from your stock motor. I personally do not believe that this is an issue.

The engineer who designed the GMT800 airbox posted on a forum once that they were good for about 360 horses. You could probably ask him what the 900 and K2 airboxes are good for.

Keith Seymore:

Mounting a stock truck air box - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mounting a stock truck air box LSx Swaps

67-72chevytrucks.com

Intro from an old Assembly Plant guy

I stumbled over to this site while looking for a good link on the A833 New Process trans and ended up posting. If I'm going to stay then I figure an introduction is in order.... Short version: My dad worked for GM for 32 years, in Manufacturing (Pressed Metal) and in Advanced...

www.gmsquarebody.com

@89Suburban has conversed with him before.

 

[iamdub]

Not sure what you are looking to gain, but I generally trim the air box itself to open in the forward panel, intaking air from around the headlight area.

Wouldn't that allow it to suck in air heated by the radiator? It might be slightly more air volume, but it's hot air. That'd probably cause a little detonation under higher loads, especially with 87 octane.

 

[iamdub]

The engineer who designed the GMT800 airbox posted on a forum once that they were good for about 360 horses. You could probably ask him what the 900 and K2 airboxes are good for.

Keith Seymore:

Mounting a stock truck air box - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mounting a stock truck air box LSx Swaps

67-72chevytrucks.com

Intro from an old Assembly Plant guy

I stumbled over to this site while looking for a good link on the A833 New Process trans and ended up posting. If I'm going to stay then I figure an introduction is in order.... Short version: My dad worked for GM for 32 years, in Manufacturing (Pressed Metal) and in Advanced...

www.gmsquarebody.com

@89Suburban has conversed with him before.

He also stated "So we ended up with a very good flowing system which also did a good job getting cool air in and keeping water out. The system was sized for the largest gas engine (L18 = 272 g/s flow) and the diesel, so it is more than adequate (oversized) for the small block engines."

Yet, so many are hooked on believing that anything must be better than stock. Some also seem to believe that the level of bling and price of cone filter is directly proportional to the gain in power because that's what the commercials blasting electric guitars and growling voiceovers while cars smoke their tires say.

The intakes of the '800 and '900 are very similar. I can't speak for the K2, though. There must be something different since they've been shown to have a considerable benefit with a quality aftermarket intake kit. The only real differences I see are the intake manifold and the huge resonator chamber on the intact duct. Whether-or-not this gain in power is worth the cost is up to the owner, though. Us '800 and '900 owners should consider ourselves fortunate in this aspect.

 

[swathdiver]

He also stated "So we ended up with a very good flowing system which also did a good job getting cool air in and keeping water out. The system was sized for the largest gas engine (L18 = 272 g/s flow) and the diesel, so it is more than adequate (oversized) for the small block engines."

Yet, so many are hooked on believing that anything must be better than stock. Some also seem to believe that the level of bling and price of cone filter is directly proportional to the gain in power because that's what the commercials blasting electric guitars and growling voiceovers while cars smoke their tires say.

The intakes of the '800 and '900 are very similar. I can't speak for the K2, though. There must be something different since they've been shown to have a considerable benefit with a quality aftermarket intake kit. The only real differences I see are the intake manifold and the huge resonator chamber on the intact duct. Whether-or-not this gain in power is worth the cost is up to the owner, though. Us '800 and '900 owners should consider ourselves fortunate in this aspect.

I converted that number to get the horsepower. He also talked about the two resonator types and the ones we have and that they do not impede performance one bit, just sound.

That post and another about K&N filtration versus stock paper is why I went back to paper since the 1980s. In the other vehicles I was want to wring every last horsepower out of them engines, even the minivans! This one, I want it to breath crisp clean air! I've been in water over the airbox before, obviously not long enough for it to flood and for the motor to get a big drink of water! Excellent design. The air temp heats up 20-30 degrees over ambient while idling but sometimes on the highway it is even a little cooler than ambient, not always, sometimes. We used to run scoops under the bumpers on our drag cars but this truck could at any time need to cross water and I would surely forget to disconnect it!

 

[swathdiver]

I converted that number to get the horsepower. He also talked about the two resonator types and the ones we have and that they do not impede performance one bit, just sound.

That post and another about K&N filtration versus stock paper is why I went back to paper since the 1980s. In the other vehicles I was want to wring every last horsepower out of them engines, even the minivans! This one, I want it to breath crisp clean air! I've been in water over the airbox before, obviously not long enough for it to flood and for the motor to get a big drink of water! Excellent design. The air temp heats up 20-30 degrees over ambient while idling but sometimes on the highway it is even a little cooler than ambient, not always, sometimes. We used to run scoops under the bumpers on our drag cars but this truck could at any time need to cross water and I would surely forget to disconnect it!

The other night we ran the trucks at the drag strip and I used the Tech-2 to take a SnapShot of two runs. Ambient air was 79 degrees. The IAT was 114 at the start of the run and 102 through the traps in the quarter mile. Next run an hour later, same 114 at the start and cooled to 96 through the traps. Ambient air was 77 on that one.

Would have been nice to grab up some cold air with a scoop under or behind the air dam.

 

[STORMIN08]

Wouldn't that allow it to suck in air heated by the radiator? It might be slightly more air volume, but it's hot air. That'd probably cause a little detonation under higher loads, especially with 87 octane.

i have commented elsewhere about this also, it could have slightly higher air temps at idle, but at speed...i doubt it. this area is far beside and more forward of the radiator. i could see if it was an open element on a carb application, yes it would heat soak very easily. but even at that, the look of the air cleaner on carb is still the best...here is my current play toy, and it makes plenty of power

 

[swathdiver]

i have commented elsewhere about this also, it could have slightly higher air temps at idle, but at speed...i doubt it. this area is far beside and more forward of the radiator. i could see if it was an open element on a carb application, yes it would heat soak very easily. but even at that, the look of the air cleaner on carb is still the best...here is my current play toy, and it makes plenty of power

We'll be picking up a Volant CAI for the 6.2 Sierra soon and going to get the scoop as well. I'll of course see if it can fit the Yukon too!

I applaud the designers of the LS engine for its performance but they get an F in looks, these motors are just ugly! Yes, your SBC is great looking, I loved the L98 type motors from the 1980s and of course my Buick GN engines, they were works of art in more ways than one as well.

Always wanted one of these:

 

[STORMIN08]

the GS is my fav...i was rollin my 1994 senior year of HS in a 60K original mile skylark (350 2 brl), Bamboo Cream w/Brown top and interior

 

[swathdiver]

the GS is my fav...i was rollin my 1994 senior year of HS in a 60K original mile skylark (350 2 brl), Bamboo Cream w/Brown top and interior

When all the kids are married off and gone I think that'll be a good time to get one, convertible too!

 

[gooffeyguy]

We'll be picking up a Volant CAI for the 6.2 Sierra soon and going to get the scoop as well. I'll of course see if it can fit the Yukon too!


View attachment 367197

I applaud the designers of the LS engine for its performance but they get an F in looks, these motors are just ugly! Yes, your SBC is great looking, I loved the L98 type motors from the 1980s and of course my Buick GN engines, they were works of art in more ways than one as well.

Always wanted one of these:

View attachment 367198

Do you have to cut out the louvers to install that to the airbox?