# Spooling slower after MBC install?
**URL:** https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923
**Category:** NYSpeed Automotive
**Created:** [July 1, 2009, 11:48am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923 "2009-07-01T11:48:46Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)
#### Post date: [July 1, 2009, 11:48am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/1 "2009-07-01T11:48:46Z")
I took a home made boost controller off, and put a new turbo XS MBC on. Now it seems to spool slower and has alot less pull. I went from 18 PSI to 15 PSI. Feels like I went to 8 PSI.
Any Ideas or am I just not used to the less boost?
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### Author:  [@travisn](https://forums.speedlife.net/u/travisn)
#### Post date: [July 1, 2009, 12:00pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/2 "2009-07-01T12:00:04Z")
put the other one back on and see how it feels? maybe its something else.
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### Author:  [@theblue](https://forums.speedlife.net/u/theblue)
#### Post date: [July 1, 2009, 12:12pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/3 "2009-07-01T12:12:42Z")
is your gauge show the same psi?
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### Author:  [@Nikuk](https://forums.speedlife.net/u/Nikuk)
#### Post date: [July 1, 2009, 12:15pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/4 "2009-07-01T12:15:14Z")
3#s can make a noticable difference on “pulling slower” depending on the app & turbo.
As far as spooling slower - what is the cracking pressure of the MBC?
single port gate? Dual port? If dual, top or bottom can?
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### Author:  [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)
#### Post date: [July 1, 2009, 12:16pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/5 "2009-07-01T12:16:47Z")
A softer spring could be letting it creep open. This would make the power feel more linear, and not so on/off.
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### Author:  [@Viper966](https://forums.speedlife.net/u/Viper966)
#### Post date: [July 1, 2009, 12:26pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/6 "2009-07-01T12:26:11Z")
not only that… but maybe you have a vacuum leak now…
you never know
put the old one back on and see whats up…
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### Author:  [@travisn](https://forums.speedlife.net/u/travisn)
#### Post date: [July 1, 2009, 12:48pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/7 "2009-07-01T12:48:50Z")
yea, a vacuum leak at the mbc will cause the wastegate to open sooner which would cause the car to feel slower/build less boost/etc.
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### Author:  [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)
#### Post date: [July 1, 2009, 2:20pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/8 "2009-07-01T14:20:19Z")
No, I’m hitting 15 PSI now.
I guess I should read up on the MBC From the site
High Perfomance Boost Controller (BC-HPBC)
Utilizing a uniquely engineered ball/spring mechanism combine with an adjustable bleed valve, the BC-HPBC allows you to spool your turbo to full boost up to hundreds of RPM faster than stock! The adjustable bleed mechanism lets you minimize the massive boost “spike” that can occur with poorly designed ball/spring manual boost controllers.
I will have to play with these adjustments some more, as far as the old boost controller… its toast. Don’t matter how I adjust it, it wants to go full boost.
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### Author:  [@travisn](https://forums.speedlife.net/u/travisn)
#### Post date: [July 1, 2009, 2:38pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/9 "2009-07-01T14:38:52Z")
> [@KuntryQuestTSi](#):
>
> Don’t matter how I adjust it, it wants to go full boost.
and thats a problem? lol…
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### Author:  [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)
#### Post date: [July 1, 2009, 4:14pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/10 "2009-07-01T16:14:11Z")
> [@travisn](#):
>
> and thats a problem? lol…
Right now it is lol
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### Author:  [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)
#### Post date: [July 2, 2009, 4:48am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/11 "2009-07-02T04:48:49Z")
Not to sound like an ass, but do you have it in backwards?
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### Author:  [@travisn](https://forums.speedlife.net/u/travisn)
#### Post date: [July 2, 2009, 4:56am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/12 "2009-07-02T04:56:51Z")
> [@Zer0DazE](#):
>
> Not to sound like an ass, but do you have it in backwards?
would that matter? all a boost controller does is allows less vacuum to act on the waste gate diaphragm, so it should work in either direction, no?
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### Author:  [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)
#### Post date: [July 2, 2009, 5:39am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/13 "2009-07-02T05:39:56Z")
It would if there is a bleeder on one side.
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### Author:  [@turbociv](https://forums.speedlife.net/u/turbociv)
#### Post date: [July 2, 2009, 7:42am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/14 "2009-07-02T07:42:36Z")
sounds like you have it in backwards or the spring pressure is to soft. I never had any real luck with mbc’s so i run ebc now.
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### Author:  [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)
#### Post date: [July 2, 2009, 10:16am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/15 "2009-07-02T10:16:16Z")
> [@Zer0DazE](#):
>
> Not to sound like an ass, but do you have it in backwards?
You don’t sound like an ass, I’m asking because I’m not sure.
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### Author:  [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)
#### Post date: [July 2, 2009, 10:18am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/16 "2009-07-02T10:18:03Z")
I believe it should feed to the bottom nipple in that pic, and the one facing right should lead to the wastegate.
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### Author:  [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)
#### Post date: [July 2, 2009, 10:20am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/17 "2009-07-02T10:20:19Z")
So I am retarded?
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### Author:  [@travisn](https://forums.speedlife.net/u/travisn)
#### Post date: [July 2, 2009, 10:27am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/18 "2009-07-02T10:27:12Z")
its not like there were instructions, were there?
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### Author:  [@KuntryQuestTSi](https://forums.speedlife.net/u/KuntryQuestTSi)
#### Post date: [July 2, 2009, 10:37am UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/19 "2009-07-02T10:37:53Z")
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### Author:  [@gsx](https://forums.speedlife.net/u/gsx)
#### Post date: [July 2, 2009, 10:16pm UTC](https://forums.speedlife.net/t/spooling-slower-after-mbc-install/69923/20 "2009-07-02T22:16:15Z")
turbo xs stuff is all backwards…compared to a lot of other things…you have it right in the pick.
why did you take the other one off if it was working? just wondering…also i hate turbo xs products
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