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Air Intake System

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Old Dec 22, 2006 | 05:05 PM
  #1  
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Air Intake System

What is a good system to replace the stock system on my 1990 F150 5.0 V8? I've read about some things but not sure what is a good one. Thanks!
 
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Old Dec 22, 2006 | 05:44 PM
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People are going to tell you k & N is the best. Well this is what I have to say from the info I have read up on


The box says you gain 20 hp. Yes, you might, but at top end rpms that your rarely at.

The intake sucks air from the engine compartment, which is hot. Hot is not good.

The stock airbox is found to be sufficent enough. I went to the junkyard and took a ford 460 intake duct and replaced it with the old one. It moves it from the hood, or top of the radiatior down to the side of the radiator, sucking COOL air from the grille.

So its a difference between $5 or $200!
 
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Old Dec 22, 2006 | 05:46 PM
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From: flordia
the stock one is alredy really good all you need is a k@n drop in arir filter and git the duct that goes from the hood to the air box from a 460 and that will make it a cold air intake and save that 2 or 300 dollars on a plastic tube
 
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Old Dec 22, 2006 | 09:04 PM
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Thanks y'all... appreciate you saving me some bucks! Merry Christmas and Happy New year.
 
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Old Dec 22, 2006 | 11:32 PM
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heres the low down,

K&N filters filter less, thats why they flow better. Stock filter will flow more than enough air for stock and slightly not stock ford engine.

Hot air is good, keeps the truck fuel economy reasonable.

IMO, open the intake with a 460 tube, leave the stock filter, they are cheap and do there job.
 
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Old Dec 23, 2006 | 12:19 AM
  #6  
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From: The Rolling Rock Town
Hot air is good, keeps the truck fuel economy reasonable.

then why dont they market hot-air intakes???
 
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Old Dec 23, 2006 | 04:10 AM
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because those are stock and intake upgrades are usually for power? (180 bucks for 1 hp increase lol)

I think a filter intake upgrade is better money spent when the rest of the motor is upgraded, actually maybe the original poster does have some things done, in the case this would be a good move for a few more ponies.
 

Last edited by Galizien; Dec 23, 2006 at 04:13 AM.
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Old Dec 23, 2006 | 06:40 AM
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Hot air is good, keeps the truck fuel economy reasonable.
NOT!!! Hot air does not contain as much oxygen for a given volume as an equal volume of cool air, this will result in less fuel being put into the engine, I will give you that. But you will be making less power andwill be stepping on the gas harder to make up for this therefore killing any increase in fuel mileage you may have gotten. If hot air is good then why do the manufacturers and performance companies all try to get the coolest air possible for the engine?

Hot air is good, keeps the truck fuel economy reasonable.
PHOOEY!!!
 
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Old Dec 23, 2006 | 07:17 AM
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From: Easton,Ks
Originally Posted by Lone Wolf #2
this will result in less fuel being put into the engine,
Less fuel?
Originally Posted by Galizien
Hot air is good, keeps the truck fuel economy reasonable.
Less fuel?

We are talking FI on the 87-96 Forum, how does the PCM computer know to put less fuel into the engine.
Are you saying the information from the ACT tells the computer to put in less fuel if the air is warmer?
I am not doubting you but never gave this much though. If you know this is how it works I would like to know.

FI - Fuel Injector or Fuel Injection
PCM - Powertrain Control Module
ACT - Air Charge Temperature sensor
 

Last edited by subford; Dec 23, 2006 at 07:25 AM.
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Old Dec 23, 2006 | 12:07 PM
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Originally Posted by subford
Less fuel? Less fuel?
We are talking FI on the 87-96 Forum, how does the PCM computer know to put less fuel into the engine. Are you saying the information from the ACT tells the computer to put in less fuel if the air is warmer? I am not doubting you but never gave this much though. If you know this is how it works I would like to know.
Yes, the PCM will supply less fuel to a warmer incoming air stream. The overriding goal of the EFI system is to maintain an optimum air/fuel ratio, about 13.5 to 14:1 for good economy and power without danger of detonation. It uses the info from all the sensors and it's pre programmed tables to calculate how much fuel to add. Warmer air is less dense than cooler air, so it take less fuel to reach the optimum A/F ratio. The downside is the warmer air also produces less power.
 
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Old Dec 23, 2006 | 02:04 PM
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From: Easton,Ks
You are right and I knew that as I have read about it before but when I wrote that this morning I was just out of bed for about ten minutes and was not thinking right yet. Later I wished that I could have just removed the post.
There is a good write up about this at:

http://fordfuelinjection.com/index.php?p=28
 
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Old Dec 23, 2006 | 02:31 PM
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Pre-coffee posts can be disreguarded.
 
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Old Dec 26, 2006 | 07:47 PM
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peeps!! hahaha i have the best intake system!!! but you need custom tubes to make this work... you have to take out the old air filter box BUT leave the peace that sucks the cold air ( the stock one ) and you put a custom filter in there so you get both!! cold air intake and the sound and power of a custom air filter that sucks hot air! letme know i tried mine and its THE BEST!! LET ME KNOW if you guuys do it and how will it result
 
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Old Dec 26, 2006 | 08:05 PM
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correction "that DOESN'T sucks hot air " sry my mistake
 
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