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Underbody braces, turbos and more!

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PostPosted: Sat Jul 04, 2015 9:03 am 
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Location: United States
I have used this flexible stainless steel tube from Super a High Vacuum chamber ( made to withstand huge amounts of force and holds its shape) for about 2' of tubing from my intercooler to my throttle body. It has an internal diameter of 1 5/8ths not including the ribs. I have standard 1 3/4" OD ends welded to it.
I run a standard 1 3/4" OD from the turbo to the intercooler..
So I guess my questions are is the size of 1 5/8ths sufficient and will the flex tubing cause air flow issues? I've used it since I reinstalled the intercooler.
I'm about to start fabricating a hook up for my new BOV and figured I better ask about the tubing now and address it if need be.
Happy 4th to everyone
Thanks Edd

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PostPosted: Sat Jul 04, 2015 9:04 am 
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PostPosted: Sat Jul 04, 2015 9:07 am 
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PostPosted: Sat Jul 04, 2015 9:57 am 
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Joined: Mon Dec 01, 2003 12:47 pm
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Location: columbus, ohio
actually, convoluted tubing is an air flow killer. the ribs shear away the outer flow at the walls and perturbs the air flow all the way to the center of the pipe.

you want the walls to be smooth and straight to achieve laminar flow. if there is a turn in the piping you want a straight run of at least 9 pipe diameters to allow flow to straighten out before entering the throttle body - a tough thing to do when space is very limited.

convoluted tubing is bad enough for a normally aspirated engine's induction piping but it seems like the higher the pressure and the higher the flow rate, the worse air flow is affected.

so, the answer to your question about the high temp stainless convoluted piping is, no, it's not a good selection for your charge air piping. smooth wall pipe is much better suited for pressurized air flow.

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1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd.

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PostPosted: Mon Jul 06, 2015 3:04 pm 
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Joined: Wed Aug 20, 2008 11:54 pm
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Location: San Jose CA USA
Get your bad self down to West Marine and ask for boat exhaust rubber flex tubing, available in all common sizes up to V8 motors. Choose your inside diameter, choose how many feet you need, and you now have flexible, smooth wall, boostable, intake tubing. Be advised, the wall thickness is, well, thick, and thus the bend radius is not tight. But I managed to plumb a Mercury Capri intercooler to a 1.9 VW canadian diesel in a Suzuki Sidekick jeep and the boat tubing made life hugely easier. Have fun. Cheers.

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PostPosted: Mon Jul 06, 2015 7:05 pm 
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i use these guys:

http://www.frozenboost.com/

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1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd.

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


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PostPosted: Tue Jul 07, 2015 7:48 am 
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Joined: Fri Dec 05, 2014 5:39 pm
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Location: United States
I never would have thought of exhaust hose. Good suggestion. I have a pile of old stainless motorcycle exhausts pipes that I'm able to cut and weld to get the desired bends I would need.
I'll have to wait until it is reassembled to make sure it fits good. I don't have a lot of room infront the intake manifold as the radiator is there but once it's together I'll be able to better evaluate my options.
Cam is on its way back to me so it won't be long now.
Edd

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