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MBC tapering

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Old Apr 23, 2008 | 06:43 PM
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From: albuquerque new mexico
MBC tapering

i need help with my boost controler. i have a turbonetics MBC and at 7k rpm it still tapers to 15 psi and i dont know if its the boost controler or just my boost guage not reading accurately. my boost guage is a autometer. and i also noticed that the needle bounces. lets say im holding 20 psi but the needle bounces between 19 and 21 really fast. is this normal? and i dont think its leaking i used teflon tape and everything is tight. and someone help me?
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Old Apr 23, 2008 | 06:45 PM
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also in 5th gear at 7k rpm the needle doesnt bounce its a constant 15 psi
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Old Apr 23, 2008 | 07:13 PM
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sounds about right. most people are putting the peak at 23 then it tapers to about 18. you are starting low and its dropping down to 15. move it up a hair to 22-23 and see where you final boost is then. most us are waiting until they can fix the boost with the ECU . only time will tell.
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Old Apr 23, 2008 | 07:15 PM
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have you take out the pill
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Old Apr 23, 2008 | 07:16 PM
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Check your blow-off valve/diverter. Stock dv are notorious for robbing boost at high rpm.
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Old Apr 23, 2008 | 07:19 PM
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how do i take the pill out? and its set to 22 psi in 3rd gear and in 5th gear its at 24 psi and tapered to 15 psi.
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Old Apr 23, 2008 | 07:21 PM
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Stock Turbo has Trouble holding boost in the upper RPM's
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Old Apr 23, 2008 | 07:22 PM
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You take the pill out by cutting it out, or replacing the hose
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Old Apr 23, 2008 | 07:23 PM
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are you talking about between the waste gate and the boost source cus i have all new hoses between there?
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Old Apr 23, 2008 | 07:27 PM
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the pill is in the top line you can fill it in there like a bump
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Old Apr 23, 2008 | 07:33 PM
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i took that hose out. and i just looked at the hose i took out and it has a clamp over that pill right?
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Old Apr 23, 2008 | 07:38 PM
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the pill is about 1" inside that line feal the lines and like I said it you will feel the bump in the line. Take it out that will help with the boost tapper
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Old Apr 23, 2008 | 07:45 PM
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which line are you talking about? are you talking about this one
https://www.evolutionm.net/forums/sh...d.php?t=337560 its the 1st picture
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Old Apr 23, 2008 | 08:14 PM
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ok look at the first line cloest to you it has a bump in it that is the pill
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Old Apr 23, 2008 | 08:18 PM
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Is there a how to? for the pill anywhere? What does taking that out accomplish?
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