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What size silicone coupler

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Old 02-27-2011, 09:20 PM
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Default What size silicone coupler

I need the right sized silicone coupler to go from an 85mm MAF to a stock 78mm throttle body. Which size do I need?
Old 02-27-2011, 09:39 PM
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85 mm converts out to a lil under 3 3/8 inches and 78 mm converts to right at a hair over 3 inches,, I would guess 3 inch would work, just stretch it to fit the maf.
Old 02-27-2011, 09:48 PM
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That's not going to work. I know that a stock tb is 4 inches outer diameter.
Old 02-27-2011, 09:51 PM
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3 inch to 3 inch, seen it done many times
Old 02-28-2011, 10:20 AM
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Originally Posted by hitmanws6
3 inch to 3 inch, seen it done many times
nope wrong. i just finished putting on a procharger and to go from the stock maf to the stock tb they supplied a 3.5 to 4 inch coupler.

heres a lint to the procharger instruction. http://www.ls1.com/ed/procharger_owners_manual.pdf check page 25 part W
Old 02-28-2011, 02:04 PM
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Originally Posted by luna123black
That's not going to work. I know that a stock tb is 4 inches outer diameter.
???????? I have 4" couplers on my car, and I have a 92 mm throttle body and a 100 mm MAF, and its tight on the maf.
Old 02-28-2011, 03:47 PM
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85mm is the ID for a truck 5 wire MAF. OD is 4", OD of a stock 78mm TB is also 4". The kicker is the inlet for the truck MAF is 3.8" OD. A 4" rubber coupler will clamp down that far, a 4" silicone will require something in between. I used electrical tape and havent blown it off under boost yet

The stock 3 wire 75mm MAF is 3.5 OD in/out, so you'll need a reducer to fit the stock TB
Old 02-28-2011, 07:40 PM
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i need one also but it looks like I'am just going to order a replacement from slp. It's $24.
Old 03-02-2011, 10:34 AM
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Ok so 4 inch on both sides. How long, what angle (i remember hearing 22) and where should I get it?
Old 03-02-2011, 01:27 PM
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4" x 6" straight silicone hose cut to fit when you get it and see where it needs it. It will bend by itself and you should use clamps to secure it and you will be fine. Go to google and type "intake hoses dot com" *hint*



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