6637 mod
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Elder User
Joined: Jun 2005
Posts: 549
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From: Connecticut
6637 mod
The 6637 mod is a great mod,but i have one question.I have done this mod to my truck recently.When i accelarate around 50 to 60 mph,i hear a wooshing sound.Is that normal,am i correct in asuming that its extra air coming out of the filter or is it the turbo rubing on the housing.It almost sounds like the turbo is rubbing the housing along with the wooshing sound.
Thanks to all that reply
Thanks to all that reply
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
I'm calling that whooshing sound "Darth Vader Breathing". ;-)))
All of 'em do it. I sorta' like it, as a matter of fact.
The squealing, I haven't heard.
As I get older, though, I'm not hearing more and more things! ;-)))
Pop
All of 'em do it. I sorta' like it, as a matter of fact.
The squealing, I haven't heard.
As I get older, though, I'm not hearing more and more things! ;-)))
Pop
Last edited by SpringerPop; Aug 10, 2005 at 01:18 PM.
New User
Joined: Feb 2005
Posts: 11
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From: 1/2 hr. S. of Milwaukee
I just completed the mod a couple weeks ago. I haven't heard any woshing sound. I might be able to hear the turbo whine a little more but not much. Sounds like you might have something else going on - not sure what though.
Logistics Pro
Joined: Aug 2005
Posts: 3,884
Likes: 180
From: Morgan Hill, CA
Your truck has always done it with the tuning upgrade, if it is a 99.5 to 2003 7.3. It's called turbo surge and it's very bad for the turbo. The fix is an ATS ported housing and a "wicked wheel" turbo impeller. The reason other people don't hear it is they don't have a chip or programmer. The early 99's don't have this problem nearly as bad, because the impeller is a different design.
New User
Joined: Apr 2005
Posts: 23
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From: Tuscaloosa, alabama
I did this mod last weekend and I have only heard the "Whoosh" sound. It is louder when the truck shifts into OD than at any other time.
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Elder User
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From: Connecticut
is the wicked wheel hard to install.What is turbo surge?Dumb question but i have the need to learn.
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Logistics Pro
Joined: Aug 2005
Posts: 3,884
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From: Morgan Hill, CA
I just did the 6637 last weekend on my early 99 and do not have the surge / stall issues yet. My HPOP is very weak and I don't get nearly enough fuel to the cyl's. I may end up having issues when I get my HPOP back up around 3000psi. Right now in PERF setting I drop to around 1400 psi...
Postmaster
Joined: Nov 2004
Posts: 2,854
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From: New Hampshire
Originally Posted by blueeyes2478
is the wicked wheel hard to install.What is turbo surge?Dumb question but i have the need to learn.
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Elder User
Joined: Jun 2005
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From: Connecticut
yes i do have gauges and no i dont have a 4 inch exhaust.I never push the truck that much,the chip was only to add some power to pass.I dont race the truck.On my other truck i had the 4 inch exhaust and 110 hp chip with the exhaust brake,with gauges.I never got it even close to 1100 egt.I was only doing the filter mod to see if i would get better fuel milage.
Postmaster
Joined: Nov 2004
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From: New Hampshire
Originally Posted by blueeyes2478
yes i do have gauges and no i dont have a 4 inch exhaust.I never push the truck that much,the chip was only to add some power to pass.I dont race the truck.On my other truck i had the 4 inch exhaust and 110 hp chip with the exhaust brake,with gauges.I never got it even close to 1100 egt.I was only doing the filter mod to see if i would get better fuel milage.
