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GREENHEAD22
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OB gearheads, cold air intakes
So noticed that my fuel mileage in my 16 Sierra has gone down and only thing that has really changed was that I went one size bigger on tires. I know bigger tires will do that but didn't think 1-1.5 mpg for one size bigger.

Been thinking of putting in a cold air intake and was looking for recommendations. My brother has an S&B and likes it and of course there is the K&Ns. Anyone particularly better than the rest? Tia


DownshiftAndFloorIt
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re: OB gearheads, cold air intakes
quote:

Anyone particularly better than the rest?


OEM is as good as you can do. To flow better you have to let more crap through or be significantly larger.

You need to correct your speedometer/odometer for the larger tires for accurate mileage numbers.

You aren't getting that fuel economy back from bolt-on stuff.


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Rando
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Member since Apr 2015
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re: OB gearheads, cold air intakes
The weight is likely what got you more than the size. Factory intake warmer air is better fuel economy.

Colder air is denser. More air means more fuel.

More fuel means less mileage.


upgrayedd
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re: OB gearheads, cold air intakes
quote:

The weight is likely what got you more than the size. Factory intake warmer air is better fuel economy.

Colder air is denser. More air means more fuel.

More fuel means less mileage.

I thought the whole point of introducing denser air is more complete fuel combustion and higher efficiency


Rando
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re: OB gearheads, cold air intakes
quote:

I thought the whole point of introducing denser air is more complete fuel combustion and higher efficiency




There's a reason every air intake from the factory today runs coolant through it. And there's a reason new cars run at higher temperatures.

Toeing the line of the leanest possible air fuel ratio at the highest safe temperature is how to increase MPG.


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Jblac15
LSU Fan
Member since Mar 2011
646 posts

re: OB gearheads, cold air intakes
Cold air intake will growl a bit more, which will make you drive more aggressively to hear the growl, which will kill any “mpg gain” you were expecting.

Also, the rule of thumb used to be cold air intakes were useless when paired with OEM exhaust. More air in requires more air out.

For what it’s worth, my Tundra has had a CAI since I’ve owned it. I love the sound but I do not believe it has any impact on MPG.


Rando
USA Fan
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re: OB gearheads, cold air intakes
Given it's a sierra. Dump a can of two of chemtool in the tank and run the piss out of it for a tank.

Pull the ground on the hot and leave it disconnected for a bit. Reconnect and drive like a grandma for a tank.

Beat you'll get


DownshiftAndFloorIt
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re: OB gearheads, cold air intakes
quote:

drive like a grandma


This is all you can do easily. The skinny pedal pumps fuel so use it less.

Going back to OEM size street tires will help more than anything as far as changing parts goes.


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Barneyrb
Arkansas Fan
NELA
Member since May 2016
3206 posts

re: OB gearheads, cold air intakes
Your fuel mileage didn't go down as much as you think, the odometer slowed down with bigger tires too. When you factor in a correction your mileage will still go down but it's not as much.

On my F150 when I put my 35's on it (winter mud grips) my mileage goes down about 3-4 mpg and my speedometer is off by 7% slow. So if I take the mileage I'm getting with the 35's and add 7%.

It does take more power to turn bigger tires, no way around that


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bapple
LSU Fan
Capital City
Member since Oct 2010
11159 posts

re: OB gearheads, cold air intakes
quote:

For what it’s worth, my Tundra has had a CAI since I’ve owned it. I love the sound but I do not believe it has any impact on MPG.


Same for my 2010 Denali. The 6.2 with a CAI has a great growl and the throttle response has certainly improved but I don’t think it does much more mileage. I also have a flowmaster 50 cat back and a tune but mileage still sucks. That’s the price to pay for 400 ponies, which I’m fine with.


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NYCAuburn
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Member since Feb 2011
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re: OB gearheads, cold air intakes
dont waste your money. at most just get a KN drop in replacement


DownshiftAndFloorIt
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re: OB gearheads, cold air intakes
quote:

just get a KN drop in replacement


Don't do this. K&N filters (and other "washable" oiled filters) are garbage.

Use oem filters. Anything built since the early 2000's will have a very good oem intake setup.


TheCurmudgeon
LSU Fan
Not where I want to be
Member since Aug 2014
1362 posts

re: OB gearheads, cold air intakes
Your fuel economy will go way down. Mine did with a 5.3 put stock back on went back up.

Don't forget you already have a cold air intake, the box draws air from outside the engine compartment


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southern686
LSU Fan
Member since Nov 2015
671 posts

re: OB gearheads, cold air intakes
quote:

Don't do this. K&N filters (and other "washable" oiled filters) are garbage.


This is 100% correct.

I would just have the truck tuned and while there have them make the correction for the tire size. This would be your easiest and best "bang for buck" spent in my opinion.



FWIW:
Here is black bear performance's CAI testing data and results using a 2016 Denali.
LINK


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20
upgrade
LSU Fan
Member since Jul 2011
7544 posts

re: OB gearheads, cold air intakes
With bolt on stuff like this, any small gain you might see will be at higher rpms. If any gain at all. And you may actually experience very small losses in power and mileage at low rpm.


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