DIY Turbo Discussion greddy on a 1.8? homebrew kit?

2.25" coupler, can it be "forced" to fit a 2" and a 2.5"?

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Old 12-06-2008, 03:28 AM
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Default 2.25" coupler, can it be "forced" to fit a 2" and a 2.5"?

Just wondering if a 2.25 silicon coupler can forced to fit on a 2" pipe and a 2.5"? Yes, i understand its not the "proper" way of doing things, but does anyone have any experience with this?
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Old 12-06-2008, 04:40 AM
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I wouldn't do it personally, too much of a chance of it breaking or leaking.
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Old 12-06-2008, 04:40 AM
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Duct tape.


Oh, JB Weld too.

Man thats 1/4" difference all around, just get the proper coupler.
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Old 12-06-2008, 04:43 AM
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$20 is much cheaper than a tow truck, that's how I see it anyway.
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Old 12-06-2008, 04:56 AM
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you are better off rigging something up with rubber ABS couplers and an ABS reducer than what you are talking about
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Old 12-06-2008, 11:52 AM
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Needs more 2-2.5" reducer?
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Old 12-06-2008, 12:12 PM
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Originally Posted by jobambo
Just wondering if a 2.25 silicon coupler can forced to fit on a 2" pipe and a 2.5"? Yes, i understand its not the "proper" way of doing things, but does anyone have any experience with this?
Carry that pipe to the muffler shop. They can inlarge or shrink the pipe that much. Probaly free to $5.00 for their time. Then you have a matching size.
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Old 12-06-2008, 12:35 PM
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Check out siliconeintakes.com They sell all the different couplers for cheap. You'll be pissed if you blow a coupler or tear one. Plus it could cause you to over-spin and damage your turbo. And who likes half-assing ****? I mean, if you're in a bind, sure. But don't rig it to save 20 bucks.
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Old 12-06-2008, 01:19 PM
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No.
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Old 12-06-2008, 01:34 PM
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I got a 2 inch coupler to fit a 2.25 inch pipe, just make a small slit in the coupler at the end to help slideing it onto the pipe, use some hairspray, and force that sucker on there. Its been holding with a v band clamp for 8 months now...
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Old 12-06-2008, 01:53 PM
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you can put a piece of 2" hose around a pipe and then slip a 2.5" coupler over that, then clamp it down. but I doubt you'll get a silicone coupler to stretch out to be bigger.
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Old 12-06-2008, 03:37 PM
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Microwave it in a bowl of warm water. It works, but its ghetto.
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Old 12-06-2008, 11:22 PM
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Originally Posted by Fireindc
Microwave it in a bowl of warm water. It works, but its ghetto.
word, get the silicone warm and you can get it to fit a .25 inch larger pipe than intended.
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Old 12-07-2008, 02:04 AM
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Originally Posted by cardriverx
word, get the silicone warm and you can get it to fit a .25 inch larger pipe than intended.
Still thinking about it.
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Old 12-07-2008, 02:11 AM
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Another question, Whats wrong with using a regular rubber hose to connect 2 metal pipes together? Technically, there is no room for it collapse. Im reading that these silicon hoses are good for 100+ psi, why would i even need that much?
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Old 12-07-2008, 03:44 AM
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OEM turbos use rubber hose. You don't tend to see silicon from the factory. It works.
Advance has some exhaust pipe reducers in various sizes for a couple bucks each. It's a cheaper way to reduce pipe size than a silicon reducer.
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Old 12-07-2008, 12:25 PM
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Originally Posted by jobambo
Another question, Whats wrong with using a regular rubber hose to connect 2 metal pipes together? Technically, there is no room for it collapse. Im reading that these silicon hoses are good for 100+ psi, why would i even need that much?
Rubber gets weak at high temps. So when you're boosting, the hotside charge pipes get really hot. And plain rubber will fail at these temps. Hence why silicone is used. It can take the heat.

For crying out loud, just buy a 20 dollar whatever you need and be done.
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Old 12-07-2008, 12:48 PM
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I'd recommend looking through the car parts store's radiator hoses to find what you need. It's intended for moderately high temp, moderate pressure, and is cord reinforced. I've been using a 2" 90° bend from this method since May with a few thousand miles on the clock and it is in perfect shape. If you look closely at my sig pic, you'll see it coming off the compressor outlet.
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Old 12-07-2008, 03:43 PM
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Originally Posted by patsmx5
Rubber gets weak at high temps. So when you're boosting, the hotside charge pipes get really hot. And plain rubber will fail at these temps. Hence why silicone is used. It can take the heat.

For crying out loud, just buy a 20 dollar whatever you need and be done.
Im a cheap SOB that wants to make a a 135 degree bend as cheap as possible.
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Old 12-07-2008, 03:55 PM
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I'm gonna laugh at you when your $6.35 solution fails you and damages your slightly more expensive turbo.
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