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Old 04-22-2008, 07:58 AM   #1
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Default How to install a manual Boost controller to an external wastegate, from turbo fitting?

I would assume that this (below) would be the ideal set-up for a MBC on an external WG; yes? I am not so sure what the purpose of the top fitting is on the WG. I'd prefer not to use it due to hood clearance issues. I usually run all of my vacuum lines straight from the break booster but I have a fitting on my turbo and would like to utilize it.

Click the image to open in full size.

The search contains a lot of vague information on this, no pictures or daigrams. Thats why I'm asking. Click the image to open in full size.

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Old 04-22-2008, 08:40 AM   #2
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That is how I have my MBC ran. I believe the top port is for Electronic Boost Controllers.
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Old 04-22-2008, 02:33 PM   #3
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Default Re: (GsrRussell)

Quote:
Originally Posted by GsrRussell
That is how I have my MBC ran. I believe the top port is for Electronic Boost Controllers.
Correct. Click the image to open in full size.
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Old 04-22-2008, 07:36 PM   #4
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Default Re: (Kyle@KR-TFab)

from what i was told by my tuner it is better to run both top and bottom even with a manual boost controller because it will stabalize boost pressure better
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Old 04-22-2008, 08:08 PM   #5
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Default Re: (90 JDM EF8)

That would mean that you putting pressure on above and below the orifice inside the wastegate. That wouldn't make sense. But maybe I am wrong. Click the image to open in full size.
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Old 04-23-2008, 05:17 AM   #6
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Default Re: (Jwbetley)

well i will know monday when i retune so i will let you know if it makes a difference...he wouldnt tell me to do something if it wasnt right...hes the tuner of the fastest hondas in las vegas so i trust him...i even checked my greddy manual boost controller instructions and it even says to route it top and bottom also
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Old 07-07-2008, 03:53 PM   #7
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Default Re: (90 JDM EF8)

so did we find out if you hook it to the top or just on the side?
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Old 07-07-2008, 05:32 PM   #8
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Default Re: (pjr710)

this has been tackled over again.

if you have a tial (or same) wg, you can run the side nipple to the ( '>' logo ) of your mbc, and then the other one goes to a boost source. like chargepipe or intake manifold.

in this way, you are restricting the pressure that goes to the side of the wg before it opens.

OR

you can have the top nipple, and side nipple of your wg used together by teeing it and lining the mbc on the top nipple.
in this way, you are adding a 'restricted' counterforce on the top of the diaghram of the wg before it will open.

so lets say your spring is rated @ 1bar to open.
and you want to boost 1.5bar.
so the side nipple senses 1.5bar right, and you want the wg to open. so you should have .5bar on the top of the diaghram of wg so it will hold .5bar more than the spring pressure.

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Old 07-07-2008, 05:56 PM   #9
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Default Re: (ralph11sec)

aight dont want to be a pain .. but i have my wastegate hooked up to my compressor right now .. i still gotta hook it to a vac source?


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Old 07-07-2008, 05:57 PM   #10
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i had mine on the top side to add pressure on top of the spring, but when i took it to get tuned, he moved it to the other side to bleed off air rather than add pressure to the top... he said i had it wrong before and the top nipple is only for electronic boost controllers.....
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Old 07-07-2008, 06:01 PM   #11
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Default Re: (96lsvtec-t)

yea i'll ask my tuner tomorow what i should do
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Old 07-07-2008, 06:08 PM   #12
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Default Re: (pjr710)

no, thats great.

thats the best boost source.

the only time you hook it up to your manifold is that if you dont have a fitting off the compressor. Click the image to open in full size.

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Old 07-07-2008, 07:01 PM   #13
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Default Re: (ralph11sec)

aight so compressor to boost controller .. then boost controller to side port?
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Old 07-07-2008, 07:16 PM   #14
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Default Re: (pjr710)

yes sir!

but make sure the mbc is not reversed. i am not entirely sure if some mbcs can go either way.
turboxs, greddy, etc, only go one way. the '<' sign goes to the boost source. and the other one of course goes to the side port
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Old 07-07-2008, 07:21 PM   #15
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Default Re: (ralph11sec)

aight cool .. thx
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Old 08-27-2008, 05:21 AM   #16
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Default Re: (pjr710)

so if i run my mbc to the side port i can just leave the top open?
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Old 08-27-2008, 06:28 AM   #17
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Default Re: (743 Stunna)

Yes. Think about it, once pressure pusing in from the line/fitting overcomes the spring rating, it moves the valve. It keeps moving it until boost stops climbing.

An EBC uses the top hole to force air into the top to close the valve until desired boost level is reached. A MBC only stops the pressure until it hits the right pressure, then allows air to push open the valve.


BTW using the compressor nipple for the WG (and for the EBC's sensor) will mean different temps of the FMIC (such as cold in the rain) will lead to slightly varying boost pressures, and thus varying levels of air temp. A vac source right off the manifold will keep boost consistent, although air temps change a bit. The manifold source will also close the WG a little quicker when you shift, meaning more gasses to keep the turbine moving. None of this is enough to really worry about, just FYI.
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Old 08-27-2008, 08:06 AM   #18
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thank you
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