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  #11  
Old 09-08-2011, 04:33 PM
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would I need 4" for my 92 D250?
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  #12  
Old 09-08-2011, 04:43 PM
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would I need 4" for my 92 D250?
You'd want it to be at least the same diameter as your throttle body diameter, anything else would be restrictive.
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  #13  
Old 09-08-2011, 05:22 PM
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Originally Posted by snrusnak View Post
You'd want it to be at least the same diameter as your throttle body diameter, anything else would be restrictive.
Well I have a turbo diesel not a gasser.
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Old 09-08-2011, 08:21 PM
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Well I have a turbo diesel not a gasser.
Well same concept.....Whatever your throttle body diameter is, don't go any smaller than that or it will be restrictive...
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  #15  
Old 10-27-2011, 08:52 PM
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I found a thread on another diesel forum a couple weeks ago when poking around before I got my truck. Looks real clean & simple, although PVC is not advisable to use in the engine compartment due to a toxic gas it gives off when heated. Plus, it also softens up when it gets hot. I think the black ABS pipe would be more appropriate if you were to build something like this. His design looks great, but material choice isn't the best (granted, there's not much choice in materials when sourcing materials from HD or Lowe's).

EDIT: I can't give the link here, it keeps changing the site domain name to ************* in the link. Do a Google search "Increase turbo whistle 80%" and you'll see the link on dieselbombers.

Last edited by HomeGrown; 10-27-2011 at 08:57 PM.
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  #16  
Old 10-27-2011, 08:57 PM
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I found THIS THREAD a couple weeks ago when poking around before I got my truck. Looks real clean & simple, although PVC is not advisable to use in the engine compartment due to a toxic gas it gives off when heated. Plus, it also softens up when it gets hot. I think the black ABS pipe would be more appropriate if you were to build something like this. His design looks great, but material choice isn't the best (granted, there's not much choice in materials when sourcing materials from HD or Lowe's).
PVC is alright to use for intake, people tend to over react a little with things like this. PVC is designed to handle temperatures well beyond 115 deg F degrees, which the intake is usually right around that temperature. CPVC for home water lines has to handle hot water from the water heater(120 deg F or higher), and regular pvc is much stronger. It takes A LOT of heat to distort pvc and emit gasses, trust me I've used a 1200 deg F heat gun to bend pvc and it took about 5 minutes of direct application before it started distorting.
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  #17  
Old 10-27-2011, 09:16 PM
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When I did a custom turbo setup on my 2000 S-10, I used PVC, but it was on the pressure side of the turbo (temporary setup) and it got somewhat pliable on me, and I could smell it when I opened the hood. Plus, it was right in the middle of the engine compartment, not off to the side like it would be for an air intake application.

Anyway, this guy's setup looks like it would be pretty smooth-flowing.
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  #18  
Old 10-27-2011, 09:52 PM
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When I did a custom turbo setup on my 2000 S-10, I used PVC, but it was on the pressure side of the turbo (temporary setup) and it got somewhat pliable on me, and I could smell it when I opened the hood. Plus, it was right in the middle of the engine compartment, not off to the side like it would be for an air intake application.

Anyway, this guy's setup looks like it would be pretty smooth-flowing.
What grade pvc did you use? Doesn't really add up as underhood temps don't get any hotter than hot water temps do in a hot water heater. Boost isn't that much psi either compared to what pvc is rated for....odd. I wonder if you used the thin wall pvc stuff, I don't know what it's rated for, but I know schedule 40 will hold up, and I've used it before and it was fine for years.
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  #19  
Old 11-01-2011, 08:36 PM
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I honestly don't remember what schedule it was, only that it was the common (probably 2") stuff from Home Depot. My somewhat "alarmist mentality" probably came from another alarmist.
But yeah, I hear you on the engine compartment temps... doesn't really seem as though it would have gotten hot enough to affect the PVC.

I may give this guy's intake design another look. It certainly would flow smoother than my gutted stock intake tube.
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