Boost creep - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Djen · 08-23-2013, 01:16 PM

Quote:

Originally Posted by King Tut

I have never ever seen boost creep on my FBM kit, only boost loss in the upper RPM range. I would say there might be an exhaust leak at your wastegate.

oooh don't tell me that how can I tell if there is leak in wastegate and what the cuases to leak? there is no loud or exhaust sound from the front if the engine

King Tut · 08-23-2013, 01:17 PM

It will be hard to tell since it might only show up when you are boosting hard. I would look for black marks on the flanges showing exhaust escaping. What style MBC is the Full Blown one? I didn't even know they sold one.

Toma · 08-23-2013, 01:19 PM

Quote:

Originally Posted by Djen

what can I do im using two of T brass tees that's not good at all or?

Why? Just plumb it direct to turbo. Why on earth are there 2 tees? Splitting one source of vaccuum/boost multiple ways is bad.

A goo rule for any "sound" build. Boost referenced fuel pressure regulators, map sensors and wastegates get their own dedicated boost source.

Everything else doesn't matter.

Djen · 08-23-2013, 01:34 PM

Quote:

Originally Posted by Toma

Why? Just plumb it direct to turbo. Why on earth are there 2 tees? Splitting one source of vaccuum/boost multiple ways is bad.

A goo rule for any "sound" build. Boost referenced fuel pressure regulators, map sensors and wastegates get their own dedicated boost source.

Everything else doesn't matter.

ill tell tee T brass from the intake manifold gose to left for BOV and the right goin to anther .tee T brass the the one down gose to Boost Gauge and the right goin to boost controller and the left connectd back to the manifold I hope its clear to you

Djen · 08-23-2013, 01:44 PM

this is the manifold I cant snap shot the one down there I already connect tee T brass goin left for BOV and right For Anther Tee T brass

this is the 2st Tee T brass coming from the connectd 1st T brass manifold. the down for Gauge and upper goin to boost controller.

Djen · 08-23-2013, 01:46 PM

by the way the 1st Tee T brass not clampd on any ways or zip ties.. and if this wrong way im doin it please help me fix it

Djen · 08-23-2013, 02:00 PM

Quote:

Originally Posted by Toma

Why? Just plumb it direct to turbo. Why on earth are there 2 tees? Splitting one source of vaccuum/boost multiple ways is bad.

A goo rule for any "sound" build. Boost referenced fuel pressure regulators, map sensors and wastegates get their own dedicated boost source.

Everything else doesn't matter.

what about Boost Gauage?

Toma · 08-23-2013, 02:21 PM

Quote:

Originally Posted by Djen

what about Boost Gauage?

Boost gauge, blow off, all that extra crap is not critical.

Good install practice is as I said...
Wastegate gets it OWN pressure source, preferably right from the compressor housing.
Map sensor gets it's own source.
Fuel Pressure regulator (in the case of return style rising rate systems) Gets its own intake manifold source.

I am not saying this is your problem, but it is how it SHOULD be done.

DJCarbine · 08-23-2013, 02:52 PM

Run a line directly from your compressor housing to the wastegate.
If there is no boost creep, I would suspect your boost controller.

King Tut · 08-23-2013, 02:55 PM

The Garrett compressor housings don't come tapped for a vacuum source. My recommendation has always been to run a vacuum manifold off one of the two vacuum hoses that come off the back of the intake manifold.

sw20kosh · 08-23-2013, 03:10 PM

Like I said, if you want to diagnose this problem you are going to have to remove the boost controller from the equation. Connect boost or manifold source directly to wastegate. See if there is still creeping going on.

DJCarbine · 08-23-2013, 03:42 PM

Quote:

Originally Posted by King Tut

The Garrett compressor housings don't come tapped for a vacuum source. My recommendation has always been to run a vacuum manifold off one of the two vacuum hoses that come off the back of the intake manifold.

I've drilled/tapped compressor housings in the past to solve that issue. I like running my WG signal as close to the compressor as possible

Either way, I think isolating the boost controller is a good first step in troubleshooting the creep

Raven604 · 08-23-2013, 04:04 PM

Swat come into my house., disrespect my family, and do you know what. It was you!

Sent from my SGH-I337M using Tapatalk 4

charged86 · 08-23-2013, 04:07 PM

Quote:

Originally Posted by Raven604

Swat come into my house., disrespect my family, and do you know what. It was you!

Sent from my SGH-I337M using Tapatalk 4

I never narced on nobody

08-23-2013, 01:17 PM	#16
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	It will be hard to tell since it might only show up when you are boosting hard. I would look for black marks on the flanges showing exhaust escaping. What style MBC is the Full Blown one? I didn't even know they sold one. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

08-23-2013, 02:52 PM	#23
DJCarbine Thupercharged Join Date: Mar 2013 Drives: 2013 FR-S Location: La Grange Park, IL. Posts: 1,501 Thanks: 116 Thanked 751 Times in 439 Posts Mentioned: 23 Post(s) Tagged: 0 Thread(s)	Run a line directly from your compressor housing to the wastegate. If there is no boost creep, I would suspect your boost controller. __________________ 2013 FRS Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF

08-23-2013, 02:55 PM	#24
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	The Garrett compressor housings don't come tapped for a vacuum source. My recommendation has always been to run a vacuum manifold off one of the two vacuum hoses that come off the back of the intake manifold. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

08-23-2013, 03:10 PM	#25
sw20kosh Senior Member Join Date: Jul 2012 Drives: 2013 Black FR-S Location: SF Posts: 3,030 Thanks: 881 Thanked 2,014 Times in 990 Posts Mentioned: 153 Post(s) Tagged: 1 Thread(s)	Like I said, if you want to diagnose this problem you are going to have to remove the boost controller from the equation. Connect boost or manifold source directly to wastegate. See if there is still creeping going on. __________________ 86DRIVE Challenge

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08-23-2013, 01:44 PM	#19
Djen Senior Member Join Date: Jun 2013 Drives: GT86 Location: Kuwait Posts: 127 Thanks: 0 Thanked 5 Times in 4 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	this is the manifold I cant snap shot the one down there I already connect tee T brass goin left for BOV and right For Anther Tee T brass this is the 2st Tee T brass coming from the connectd 1st T brass manifold. the down for Gauge and upper goin to boost controller.

08-23-2013, 01:46 PM	#20
Djen Senior Member Join Date: Jun 2013 Drives: GT86 Location: Kuwait Posts: 127 Thanks: 0 Thanked 5 Times in 4 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	by the way the 1st Tee T brass not clampd on any ways or zip ties.. and if this wrong way im doin it please help me fix it

08-23-2013, 04:04 PM	#27
Raven604 Senior Member Join Date: Dec 2012 Drives: 2013 Scion FR-S Location: Vancouver Posts: 328 Thanks: 93 Thanked 113 Times in 65 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Swat come into my house., disrespect my family, and do you know what. It was you! Sent from my SGH-I337M using Tapatalk 4

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