Cold Air Intake a letdown
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RE: Cold Air Intake a letdown - 2/4/2006 12:42:10 AM
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LittleDan911
Posts: 147
Joined: 10/3/2005
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Do You Have A Box Around The Cone Filter.... Cause If Not You Pulling In Some Hot Air.....And All Cold Air... And You Try Re-Instaling That Sensor You Took Out Just To See If That Make A Difference
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RE: Cold Air Intake a letdown - 2/4/2006 9:19:58 AM
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swartlkk
Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
Status: online
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Well, first problem I see is that the filter is open to hot engine bay air. If you were to let it cool COMPLETELY down, and make acouple of runs with the new intake, it would give you an idea of what it will be like with the air filter isolated from engine heat. Also, were these times taken on the same day, roughly the same ambient air temp?
Just another question, where is the IAT sensor located in this setup? I just can't see in the pic on the auction where it would go in... Also, is that filter a K&N? If not, get rid of it! Most wanna-be K&Ns filter like garbage and hold up like garbage.
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RE: Cold Air Intake a letdown - 2/4/2006 2:43:20 PM
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DaveLance
Posts: 51
Joined: 1/28/2006
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Have you upgraded your exhaust to compensate for the higher airflow?
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RE: Cold Air Intake a letdown - 2/4/2006 4:53:23 PM
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DaveLance
Posts: 51
Joined: 1/28/2006
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Look at it this way. An intake/exhaust need to balance each other. A stock intake and stock exhaust work properly because they are designed that way. If you increase the amount of air coming in, then you need to increase the amount of exhaust going out. In everyday driving, you may not notice it that much, but since you're running 1/4 miles, you're trying to force the truck to breathe harder and not giving it a way to get rid of the increase in exhaust. You're basically choking the engine.
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RE: Cold Air Intake a letdown - 2/4/2006 5:43:40 PM
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swartlkk
Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
Status: online
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DaveLance, that is COMPLETELY false. By putting on a lower restriction intake, you are making the cylinders work less to pull in the air. It's not like the intake is FORCING air into the engine. The engine is one big air pump. Decreasing the restrictions only serves to make the engine more efficient. If you decrease the restriction on the intake, then you may have a higher restriction on the exhaust and then the exhaust would be your limiting factor, but you would still see gains from an intake. True, a better gain can be seen with an exhaust system in place. Typical CAI's net 5-10hp to the crank simply due to the lower restriction and the combination of a good CAI and a lower restriction exhaust (headers & cat) would be upwards of 20-25hp at the crank.
And the "balance" that is in the intake and exhaust really isn't a performance based balance anyway. The intake is tuned to reduce the amount of noise that escapes. The exhaust is tuned for lower emissions and noise. True, they are matched together, but they are done so with concessions along the way. An intake that is designed to cancel out the intake harmonics won't necessarily be the highest flowing intake, the same is true for the exhaust. Gains can be found by simply lowering the restrictions.
Now back to the topic at hand.
strongboy2005, I'm betting that your decrease in 1/4 mile performance is mainly based on the fact that the filter can draw in heated air from the radiator. Fix that and you should see better (or atleast similar) times. Also, although G-Techs are great for showing things like this, they do have quite a bit of variance and that could be making the gap wider between your two scenarios.
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My Restoration Projects
Please Do Not PM for Tech Help
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RE: Cold Air Intake a letdown - 2/4/2006 8:43:48 PM
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4lowlife
Posts: 1562
Joined: 12/29/2005
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quote:
Actually I think I'm gonna just go with an airbox mod. It will give the engine more of a "stock" look (sleeper), and offer better performance than an open-air cone. Are there any "airbox mod" how-tos or anything like that on this site or elsewhere?
I punched holes in the front of the factory air cleaner box. Until I saved enough for the K&N FIPK.
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