hose from air box to boost solenoid what it it for? - MG-Rover.org Forums
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post #1 of 15 (permalink) Old 24-05-2017, 16:22 Thread Starter
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hose from air box to boost solenoid what it it for?

today i replaced my boost solenoid with an ebay one, (good thing i did cause the hose from the compressor was alarmingly loose) and theres the odd hose connected to the airbox.
instructions for the new solenoid on the internet only require the compressor and wastegate actuator pipes be connected, and the third one's for the muffler thing. what is it for exactly and should i reconnect the airbox pipe to it? i sealed it with tape for now

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post #2 of 15 (permalink) Old 24-05-2017, 19:27
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I assume it is a K4 tubby?
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post #3 of 15 (permalink) Old 24-05-2017, 20:34 Thread Starter
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I assume it is a K4 tubby?
Idk
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post #4 of 15 (permalink) Old 24-05-2017, 21:01
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Connect the hose to the boost control valve or blank it off. Both work fine.
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post #5 of 15 (permalink) Old 24-05-2017, 21:40
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I assume it is a K4 tubby?
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Idk
K series 4 cylinder turbo charged engine.
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post #6 of 15 (permalink) Old 25-05-2017, 03:38 Thread Starter
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K series 4 cylinder turbo charged engine.
Yes it is.. and do u kno based off the pictures I've seen relative to the yellow hose the dump valve is facing downwards? I want to put a loud hissing one lol
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post #7 of 15 (permalink) Old 25-05-2017, 03:43 Thread Starter
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Connect the hose to the boost control valve or blank it off. Both work fine.
I see. I'll test both options and see which works better (louder lol). I was gon connect it too but ran out of hose barbs, ordered some angled hoee barbs too but they havent arrived yet and thought **** it and installed the solenoid anyways
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post #8 of 15 (permalink) Old 25-05-2017, 18:46
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The original dump valve is bolted to the turbo. You can swap it for an atmospheric one if you want noise.
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post #9 of 15 (permalink) Old 29-05-2017, 15:00 Thread Starter
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The original dump valve is bolted to the turbo. You can swap it for an atmospheric one if you want noise.
does i need to get a blanking plate too?
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post #10 of 15 (permalink) Old 31-05-2017, 21:19
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If you are swapping the original one for a bolt on atmoshperic one, then no - just swap them over. If you are cutting the boost pipes and fitting an aftermarket fit one into them then yes you'll need to blank the original one off.
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post #11 of 15 (permalink) Old 01-06-2017, 08:32 Thread Starter
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If you are swapping the original one for a bolt on atmoshperic one, then no - just swap them over. If you are cutting the boost pipes and fitting an aftermarket fit one into them then yes you'll need to blank the original one off.
thanks, i think i will order a recirculating one instead cause it's less loud
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post #12 of 15 (permalink) Old 02-06-2017, 23:35
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Original one is a recirculating one. You don't need to add another.
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post #13 of 15 (permalink) Old 03-06-2017, 07:46
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The internal spring suffers with age and go weak, even a new O/E spec is an improvement after 10 years.
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post #14 of 15 (permalink) Old 03-06-2017, 08:28 Thread Starter
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The internal spring suffers with age and go weak, even a new O/E spec is an improvement after 10 years.
Yep I also ordered a new spring,
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post #15 of 15 (permalink) Old 10-06-2017, 18:25 Thread Starter
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new dump valve fitted

so my new forge recirculating valve came and i've just fitted it.. no pshhht sound from it at all as it's not the atmospheric kind, i pu$$ied out and opted for a quiet one..
i can say theres an improvement in throttle response but that could be due to the old one being a bit tired at the stage of its life. i recommend getting your dump valves upgraded, the forge's one's designed so the housing houses the spring and can be opened and closed like a jar by turning, this is a better design than the oem one which has the spring pressed against between the body of the turbo and the dump valve case which makes taking it out a bit of a pain because of the spring that is eager to come out..
the valve for the hose which connects to the inlet manifold also could be turned to any position. in conclusion, get one cause it's shiny and treat the spring a service item and the forge dump valve makes taking it out of the turbo much easier, and or get the atmospheric kind to get the pshhhht sound.

tbh i deserve a medal for being able to take the old one out and fit a new one in whilst the turbo is still in the car. it was torture.

**oh the forge dump valve comes with a green spring in it so you dont really need to buy a separate spring.
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