Screamin Turbo
Smokin
Joined: Jun 2006
Posts: 8,849
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Yep sure thing. Just think about it this way... when you are towing, and at an elevation (and a change in atmospheric pressure), your truck works harder to force in all of that air it needs, and as a turboed vehicle, it's forced induction so your turbo has to work a lot harder - and therefore it complains about it a bit more, hence the "scream" you hear.
Do you have a boost, EGT guage? If you're running your turbo that hard, you might be getting those exhaust gasses reeeaallly hot, too....
I live at about 6,000 foot, and when we go camping or whatever we reach as high as 13,500 with the truck..and you should hear that turbo scream. I had someone tell me once that it sounded like a pissed off puma.
Edit..didnt see all these new posts...you should take your hoses off and check that thing out just to make sure. The noise I have in mind may be different. Would be nice to hear this roaring.
Do you have a boost, EGT guage? If you're running your turbo that hard, you might be getting those exhaust gasses reeeaallly hot, too....
I live at about 6,000 foot, and when we go camping or whatever we reach as high as 13,500 with the truck..and you should hear that turbo scream. I had someone tell me once that it sounded like a pissed off puma.
Edit..didnt see all these new posts...you should take your hoses off and check that thing out just to make sure. The noise I have in mind may be different. Would be nice to hear this roaring.
Snowboard season cometh..
Joined: Jan 2006
Posts: 5,406
Likes: 1
From: Gulf Coast of Florida
You're referring to the radiator fan, yes? I think it was Eugene & Kwik that talked most about the incredible noise that the radiator fan has its clutch lock up. It only happened when the truck was working really hard, IIRC. That might be what you're hearing.
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
Isn't anyone going to tell this guy to ditch the K&N and replace it with a 6637 to save his turbo and engine? Where are your manners? 
My 99 is an early and the turbo does wail... a quick look at the turbo will tell you if it's an early or late model- the late models have reinforcement ribs at the inlet where the intake attaches to the turbo, the earlys don't have those ribs.
My 99 is an early and the turbo does wail... a quick look at the turbo will tell you if it's an early or late model- the late models have reinforcement ribs at the inlet where the intake attaches to the turbo, the earlys don't have those ribs.
Thread Starter
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New User
Joined: Jul 2008
Posts: 9
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From: LEVITTOWN, PA.
There are reinforcement ribs at the inlet. I'm leaving in the morning for a 9 day camping trip at the Jersey shore so things will have to wait until I get back. Thanks everyone for your input, I will consider one and all. Thankfully there are no mountians on the way to the Jersey Shore.
Posting Guru
Joined: Nov 2007
Posts: 1,521
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From: Tupelo,Ms
Isn't anyone going to tell this guy to ditch the K&N and replace it with a 6637 to save his turbo and engine? Where are your manners?
My 99 is an early and the turbo does wail... a quick look at the turbo will tell you if it's an early or late model- the late models have reinforcement ribs at the inlet where the intake attaches to the turbo, the earlys don't have those ribs.
My 99 is an early and the turbo does wail... a quick look at the turbo will tell you if it's an early or late model- the late models have reinforcement ribs at the inlet where the intake attaches to the turbo, the earlys don't have those ribs.
ha ha but yea ditch the k&n and go with the 6637 and you can still make use of that k&n tube if im not mistaken right guys>??
Posting Guru
Joined: Nov 2007
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From: Tupelo,Ms
its a napa filter go to fleetfilters.com and type in 46637 (thats the part number) and then holler at pete to get a cover
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Freshman User
Joined: May 2008
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I have a 2002 PSD and my turbo screams when I am running between 1500 and 2000 RPM, say when I am going up a hill and you would expect to hear a whistle. If it is at higher RPMs then it whistles like it always has, but I started noticing it after I had replaced the stock air box with a 6637 and one of Pete's filter covers. I took my pipes off and the turbo seems to be fine, no play at all no excessive oil and the fins look good. I am writing it off as the turbo being louder (easier to hear) with the 6637 filter. Maybe it is the same with your K&N since you don't have the stock air box on anymore.
This may be a stupid question but does anyone know if elevation affects the turbo at all, I live at over 5,000ft. Also if there were an exhaust leak or the EBPS (Exhaust Back Pressure Sensor) were fried, does anyone think that would effect the turbo and make it scream.
By all means get a 6637 and throw the K&N in the dumpster, I made the exact same mistake wasting a bunch of money on a K&N and then through it away because I wanted to save my turbo and engine.
This may be a stupid question but does anyone know if elevation affects the turbo at all, I live at over 5,000ft. Also if there were an exhaust leak or the EBPS (Exhaust Back Pressure Sensor) were fried, does anyone think that would effect the turbo and make it scream.
By all means get a 6637 and throw the K&N in the dumpster, I made the exact same mistake wasting a bunch of money on a K&N and then through it away because I wanted to save my turbo and engine.
Posting Guru
Joined: Feb 2004
Posts: 2,365
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From: IOWA
I'll be odd man out here, if you are maintaining your K&N filter properly, there's no reason you can't leave it on there. I've run one for around 100k miles, and played around with the 6637, and I notice no difference between the two. I actually think the K&N does a better job. I have the 6637 with a cover on it right now and just the other day I was able to wipe the inside of the intake tube and leave a mark, could never do that with the K&N.
Key with the K&N, they have to be maintained!!! otherwise they are junk.
With your roar, you may just be working your truck hard enough and it's the fan kicking it, it can be noisy enough to drown out the engine noise. If your turbo was making a bad of a noise as you say, I think you'd be seeing a lot of smoke and have no power.
Key with the K&N, they have to be maintained!!! otherwise they are junk.
With your roar, you may just be working your truck hard enough and it's the fan kicking it, it can be noisy enough to drown out the engine noise. If your turbo was making a bad of a noise as you say, I think you'd be seeing a lot of smoke and have no power.
Posting Guru
Joined: Nov 2007
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From: Tupelo,Ms
farmboy what is the downtime due to cleaning the filter? i had a k&n pan style filter and it just took to much time for me to be cleaning it every week. and i agree with your point on maintaining it but maint. is the KEY to everything on these trucks but i think k&n doesnt emphisize this enough i mean there selling point is a million mile filter.. but to each his own
Smokin
Joined: Jun 2006
Posts: 8,849
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FWIW...I have an airraid on mine. Everyone on here told me I should get rid of it, but I clean it and oil it at each oil change, and my intake hose is always spotless, I always run a clean white rag up in there and I never come out with anything.
Posting Guru
Joined: Jul 2004
Posts: 1,777
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From: Buckingham, IA
farmboy what is the downtime due to cleaning the filter? i had a k&n pan style filter and it just took to much time for me to be cleaning it every week. and i agree with your point on maintaining it but maint. is the KEY to everything on these trucks but i think k&n doesnt emphisize this enough i mean there selling point is a million mile filter.. but to each his own
I think with these covers everyone uses on the 6637, put one on a K&N or airraid will do just as much good or better for these filters.
Someone asked, you can use the intake tube from the K&N FIPK setup to use on the 6637. That's the way I have mine hooked up. I did have to remove the heat shield around the filter because the 6637 is too big it didn't fit.
Last edited by farmdad; Jul 25, 2008 at 03:25 PM. Reason: wrong poster, the old man needs to learn out to log out!