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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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  #11  
Old 07-30-2009, 06:46 PM
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Quote:
Originally Posted by bikingguy1 View Post
not at all. i have driven for an hour then poped the hood and grabbed the intake it wasnt hot at all. but they do sell an intake made out of Thermoplastic if you want.

I am sorry i can't beleive that, my intake was made of aluminum same one as the k&n, same as all the otehr ones, those thing aren't "COLD AIR INTAKES" but more like hot sucking extra gas gussling intakes, even with the best shields, if it's not getting it's air from a direct outside path, it's also useless in my opinion, i ran my logger with all three recently, my cai, the airaid and the original, winner with the coldest air was the airaid, why ? i think it has to do with the bigger pipe and that it's made out of some sort of plastic, my cai was clearly the looser here, all aluminum , that thing soaked up the engine heat like crazy, and it was shieled by the hollowed out box, then original intake system with a drop in k&n, not as much "grunt" and the butt dyno did notice a bit less torque, but then again, it might just be because of the sound...
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  #12  
Old 07-30-2009, 06:50 PM
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Originally Posted by bikingguy1 View Post
not at all. i have driven for an hour then poped the hood and grabbed the intake it wasnt hot at all. but they do sell an intake made out of Thermoplastic if you want.

Here's mine that i did a while back

http://s219.photobucket.com/albums/c...t=P1010120.jpg
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  #13  
Old 07-30-2009, 06:57 PM
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I dont know if it is just me but if you take a look at the dyno sheet there are 2 lines...

RED is with the K&N and BLUE is stock

Starting from 3500 rpm there is already an increase in HP

the "9.29" is the PEAK HP gained at the specified 4800 rpm.

please guys try to analyze the graph first before making comments about it

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  #14  
Old 07-30-2009, 07:08 PM
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Quote:
Originally Posted by PANGGOY View Post
please guys try to analyze the graph first before making comments about it
Please guys try not to insult the engineers before assuming we're idiots.

I thought one important part of the discussion was about intake tubes, their cross-sectional area, and turbulence caused by interior roughness.

Since the dyno chart changed both the tube and the filter from stock, there's too many variables to separate the tube effect from the filter pressure drop. An interesting chart for a discussion about tube physics would be one where that was the only changed variable. I don't think that data's been taken, but I may be wrong.

I see there's a difference even at 3500 RPM, and I can extrapolate backwards. But for me personally, I spend almost no time even at 3500 RPM, and certainly wouldn't notice 10 HP difference in the 1/2 second I might be there before a shift. Personally, I'm looking for low end torque for the trails, and good mileage for the drive to and from them. That's all. YMMV.



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  #15  
Old 07-30-2009, 07:28 PM
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Originally Posted by the roadie View Post
Please guys try not to insult the engineers before assuming we're idiots.

I thought one important part of the discussion was about intake tubes, their cross-sectional area, and turbulence caused by interior roughness.

Since the dyno chart changed both the tube and the filter from stock, there's too many variables to separate the tube effect from the filter pressure drop. An interesting chart for a discussion about tube physics would be one where that was the only changed variable. I don't think that data's been taken, but I may be wrong.

I see there's a difference even at 3500 RPM, and I can extrapolate backwards. But for me personally, I spend almost no time even at 3500 RPM, and certainly wouldn't notice 10 HP difference in the 1/2 second I might be there before a shift. Personally, I'm looking for low end torque for the trails, and good mileage for the drive to and from them. That's all. YMMV.
If proving a point is insulting then I'm sorry.

1. The OP mentioned about "butt dyno" and such that is why i provided a dyno sheet.

2. After provision of the dyno sheet, a couple made a comment about who will drive their TB in 4800 rpm

Soooo... i mentioned that the HP gain is not just in 4800 rpm and above. it starts from 3500 (based from the graph)

Btw, i have a Bachelors Degree under my belt too so we are both professionals. nobody is calling anyone an idiot

Anyhow, i hope someone will provide a dyno of an intake with the K&N filter only for comparison purposes. As far as complete K&N CAI is concerned, there is in fact a HP gain even with the heat absorption.

Maybe a full CAI will be most useful for highway driving where you need some "extra" HP and torque for passing and the high air flow will help lessen the heat soak from the engine bay. IMHO
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  #16  
Old 07-30-2009, 07:42 PM
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Originally Posted by PANGGOY View Post
... mentioned about "butt dyno" and such that is why i provided a dyno sheet....
Agreed. As we used to say: In God we trust - all others bring data. I still can't believe they're selling those punched aluminum disk intake airflow swirly tornado gadgets.





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  #17  
Old 07-30-2009, 09:30 PM
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Quote:
Originally Posted by PANGGOY View Post
I dont know if it is just me but if you take a look at the dyno sheet there are 2 lines...

RED is with the K&N and BLUE is stock

Starting from 3500 rpm there is already an increase in HP

the "9.29" is the PEAK HP gained at the specified 4800 rpm.

please guys try to analyze the graph first before making comments about it

3500 rpms....ok i'll bite, are you running 22" overall wheels on a 4.56 gear ratio ?


most of us stay in the 1700-2000 rpms, I am not saying they don't work, i'm just saying that in the "real" world they add nothing, use the 300$ on a tune or something else that will actually give you back what you spent...

Also if you look closely again, the k&n runs hotter, 81.85 for stock and 86.74
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  #18  
Old 07-30-2009, 09:35 PM
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Quote:
Originally Posted by the roadie View Post
Agreed. As we used to say: In God we trust - all others bring data. I still can't believe they're selling those punched aluminum disk intake airflow swirly tornado gadgets.

Sorry to say, but those really do work....i know a guy that saw a guy buy one and his hyunday pony made 49mpg and was doing 0-60 in 2,9 seconds...

Now if someone had two front fenders to spare, i'll gladly think of a way of adding scoops on the sides like some other have done, we just need to move that washer fluid tank somewhere else.....in the back maybe ?

i was thinking of those hoods, wich look hot btw, but i am unsure if they really do a difference
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  #19  
Old 07-30-2009, 09:46 PM
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Quote:
Originally Posted by pjaneiro View Post
3500 rpms....ok i'll bite, are you running 22" overall wheels on a 4.56 gear ratio ?


most of us stay in the 1700-2000 rpms, I am not saying they don't work, i'm just saying that in the "real" world they add nothing, use the 300$ on a tune or something else that will actually give you back what you spent...

Also if you look closely again, the k&n runs hotter, 81.85 for stock and 86.74
that is the outside air temp. and i hit 3500 all the time when accelerating.
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  #20  
Old 07-30-2009, 10:35 PM
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Quote:
Originally Posted by pjaneiro View Post
most of us stay in the 1700-2000 rpms, [B]I am not saying they don't work, i'm just saying that in the "real" world they add nothing[/B], use the 300$ on a tune or something else that will actually give you back what you spent...

Also if you look closely again, the k&n runs hotter, 81.85 for stock and 86.74
my friend, did you just contradict yourself in that statement? because if they work, that means they add something right?

well, i guess we just have to agree to disagree.

sorry man, but i will never agree that replacing the filter alone and hollowing out the airbox will yield better results unless i see a dyno sheet. maybe i'm used to my line of work that anything that has no research and documentation to back it up is considered "hearsay"


Quote:
Originally Posted by bikingguy1 View Post
that is the outside air temp. and i hit 3500 all the time when accelerating.
right and me too.
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