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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-24-2004, 09:50 PM   #1 (permalink)
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I want to buy a K&N Intake, but ive heard that i would need a heatshield, will it make any difference if i dont have a heatshield.
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Old 09-24-2004, 10:19 PM   #2 (permalink)
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it makes for lower temps.
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Old 09-24-2004, 10:23 PM   #3 (permalink)
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i know on my car without a heat shield the hot air from the alternator blows right onto the cone filter
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Old 09-24-2004, 10:23 PM   #4 (permalink)
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But will it actualy increase hp or decrease hp, this is my first car and i would like to increse performace without messing anything up.
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Old 09-24-2004, 10:25 PM   #5 (permalink)
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increase. the cooler the air. the more horsepower you will get from a engine.
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Old 09-24-2004, 11:07 PM   #6 (permalink)
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like he said, it will increase...hence the COLD AIR INTAKE...the farther the initial air filter is away fromt he engine (in a cooler spot) the engine sucks cooler air which is better and increases hp..
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Old 09-25-2004, 04:51 PM   #7 (permalink)
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actually the only gains you'll find are a more aggressive WOT sound really. Any sort of horsepower gain will not be a peak gain, but over the entire powerband and be extremely minimal. :-/
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Old 09-26-2004, 02:44 AM   #8 (permalink)
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Originally posted by Halon@Sep 25 2004, 03:51 PM
actually the only gains you'll find are a more aggressive WOT sound really. Any sort of horsepower gain will not be a peak gain, but over the entire powerband and be extremely minimal. :-/
[snapback]198975[/snapback]
he's right. I believe that investing in a CAI system or any time of cone filter system for our car is completely useless, but only good for a deeper sound of the six cylinder engine. The speculative gains aren't really much. Intake systems dont do much for the m20's as much as they do with hondas. The biggest gains we get from these engines are mainly internally.
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Old 09-26-2004, 04:36 PM   #9 (permalink)
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thanks a lot for all the responses
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Old 09-26-2004, 10:53 PM   #10 (permalink)
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you need a heatshield IMO. it will keep the hot air from the radiator(at slow speeds) from entering your engine. now say to yourself, do you want hot or cold air going into the COLD AIR intake? Id say cold, so get the heat shield, will save you loads of trouble later on.
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Old 09-27-2004, 07:20 AM   #11 (permalink)
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I agree get the heat sheild. What kind of driving are you gonna be doing stop and go . Stop and go driving does not bring in to much cold air SSo if you have that heatsheild it may not increase so much hp but will definelty be smooth and better.
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Old 09-27-2004, 07:34 AM   #12 (permalink)
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Quote:
Originally posted by 1985bmw325e+Sep 26 2004, 01:44 AM--><div class='quotetop'>QUOTE(1985bmw325e @ Sep 26 2004, 01:44 AM)</div><div class='quotemain'><!--QuoteBegin-Halon@Sep 25 2004, 03:51 PM
actually the only gains you'll find are a more aggressive WOT sound really. Any sort of horsepower gain will not be a peak gain, but over the entire powerband and be extremely minimal. :-/
[snapback]198975[/snapback]
he's right. I believe that investing in a CAI system or any time of cone filter system for our car is completely useless, but only good for a deeper sound of the six cylinder engine. The speculative gains aren't really much. Intake systems dont do much for the m20's as much as they do with hondas. The biggest gains we get from these engines are mainly internally.
[snapback]199212[/snapback]
[/b][/quote]


I do not feel it is completely useless, the CAI is the first step in getting your car breathing better and second that with an exhaust it will enhance your performance. one mod compliments the other and these two work together.
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Old 09-27-2004, 12:05 PM   #13 (permalink)
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The hot air will acctually rob you of horspower. check out my tread on 535 AFM upgrade.

What I have decided to do is get a stock style K&N. This will combine with the ram air I fabricated. I believe I posted insrtuctions on my ram air set up in the AFM thread also.

$40.00 for the K&N
$16.00 for the ram air total fabrication and instal is about 30 - 45 min.

I believe the ram air is a much more efficient way to go.
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Old 09-27-2004, 10:41 PM   #14 (permalink)
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Quote:
Originally posted by k2c69n+Sep 27 2004, 06:34 AM--><div class='quotetop'>QUOTE(k2c69n @ Sep 27 2004, 06:34 AM)</div><div class='quotemain'>
Quote:
Originally posted by 1985bmw325e@Sep 26 2004, 01:44 AM
<!--QuoteBegin-Halon
Quote:
@Sep 25 2004, 03:51 PM
actually the only gains you'll find are a more aggressive WOT sound really.* Any sort of horsepower gain will not be a peak gain, but over the entire powerband and be extremely minimal.* :-/
[snapback]198975[/snapback]


he's right. I believe that investing in a CAI system or any time of cone filter system for our car is completely useless, but only good for a deeper sound of the six cylinder engine. The speculative gains aren't really much. Intake systems dont do much for the m20's as much as they do with hondas. The biggest gains we get from these engines are mainly internally.
[snapback]199212[/snapback]

I do not feel it is completely useless, the CAI is the first step in getting your car breathing better and second that with an exhaust it will enhance your performance. one mod compliments the other and these two work together.
[snapback]199844[/snapback]
[/b][/quote]

that is true, i know that breathing better for any engine in a car is always great, but the speculative gains on an e30 with cai isn't much. Intake air induction for e30s suck to begin with, and it will ever so slightly, if not none at all, gain any significant difference for any person to notice. Ask me how i would know
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