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

Djen · 08-23-2013, 03:12 AM

greeting.. boost rise when set to10psi the problem now is boost hold all the way. when RPM Climb around 5000+all the way redline boost creeps higher and higher around 12-13. anything should be warry about it? i just cant keep goin seeing creep like that for safety to engine i pull my foot right the way!!

solutions for my issues i'll be much pleased..

sw20kosh · 08-23-2013, 03:36 AM

What turbo kit do you have?

A little bit of creep should be tolerable as long as your data logs look clean of knock.

Usually this happens when your wastegate is insufficient at venting the amount of exhaust gas you are throwing at the turbo.

Also, if you have one, check your boost controller and all the lines that go to and from your boost controller and wastegate for leaks.

Djen · 08-23-2013, 03:41 AM

Quote:

Originally Posted by sw20kosh

What turbo kit do you have?

A little bit of creep should be tolerable as long as your data logs look clean of knock.

Usually this happens when your wastegate is insufficient at venting the amount of exhaust gas you are throwing at the turbo.

Also, if you have one, check your boost controller and all the lines that go to and from your boost controller and wastegate for leaks.

FBM kit and i don't think there is leak. and yes the wasetgate the upper banjo keept open. don't you think I need stiffer wasgate pressure spring? because installed a 6-7psi spring in ther. and yes at WOT the data looks clean I have some knock while crusing on low throttle open..

Dipstik-sportech · 08-23-2013, 03:48 AM

What kind of boost controller are u running? Is the wastegate recirculated or open to atmosphere?

Djen · 08-23-2013, 03:51 AM

Quote:

Originally Posted by Dipstik-sportech

What kind of boost controller are u running? Is the wastegate recirculated or open to atmosphere?

FBM manual controller and yes its recirculated back to the EX.

Djen · 08-23-2013, 03:52 AM

im using regualer vacuum tees to connect hoses that used for water/air metal one should effect? and plastic zip ties

sw20kosh · 08-23-2013, 12:54 PM

If you know what you are doing, disconnect the boost controller and go back to just using the wastegate. This will diagnose the problem as:

1. Boost controller malfunction
Or
2. Wastegate malfunction or leak in the boost refrence hoses

Djen · 08-23-2013, 12:59 PM

Quote:

Originally Posted by sw20kosh

If you know what you are doing, disconnect the boost controller and go back to just using the wastegate. This will diagnose the problem as:

1. Boost controller malfunction
Or
2. Wastegate malfunction or leak in the boost refrence hoses

hmm this kinda take times but if I disconnect the boost controller and put it directly how can I boost for 10psi? my wastgate pressure spring only 7psi I think im goin to disconnect the boost controller and re connect them agine with hoses goin to wasgate and see if this dose change

Toma · 08-23-2013, 01:06 PM

What style of Vaccuum line? Cheap "silicone" rubber tends to swell and "drop" pressure. But not usually till higher boost.

Keep the Vaccum lines as short as possible. Avoid "T's" that reduce inside diameter or are a restriction.

I usually plumb the turbo compressor housing direct to wastegate.

If it still does it....

Then either the wastegate has insufficient flow, or if the turbine section is restrictive, the timing could be too low (creates excess heat energy, has greater affect on small housings).

But I like boost creep, 2-3 pounds is very nice

Djen · 08-23-2013, 01:07 PM

the vacuum start from the intake Manifold Tees not clamped or zip tie just do you think this the cuses leaks? on 10psi?

Djen · 08-23-2013, 01:08 PM

Quote:

Originally Posted by Toma

What style of Vaccuum line? Cheap "silicone" rubber tends to swell and "drop" pressure. But not usually till higher boost.

Keep the Vaccum lines as short as possible. Avoid "T's" that reduce inside diameter or are a restriction.

I usually plumb the turbo compressor housing direct to wastegate.

If it still does it....

Then either the wastegate has insufficient flow, or if the turbine section is restrictive, the timing could be too low (creates excess heat energy, has greater affect on small housings).

But I like boost creep, 2-3 pounds is very nice

the mechanic used Brass Tees

Djen · 08-23-2013, 01:11 PM

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

King Tut · 08-23-2013, 01:13 PM

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.

Djen · 08-23-2013, 01:15 PM

hmm ill snap shot some and post the way im connecting the tees alright

08-23-2013, 03:12 AM	#1
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)	Boost creep greeting.. boost rise when set to10psi the problem now is boost hold all the way. when RPM Climb around 5000+all the way redline boost creeps higher and higher around 12-13. anything should be warry about it? i just cant keep goin seeing creep like that for safety to engine i pull my foot right the way!! solutions for my issues i'll be much pleased.. Last edited by Djen; 08-23-2013 at 03:38 AM.

08-23-2013, 03:36 AM	#2
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)	What turbo kit do you have? A little bit of creep should be tolerable as long as your data logs look clean of knock. Usually this happens when your wastegate is insufficient at venting the amount of exhaust gas you are throwing at the turbo. Also, if you have one, check your boost controller and all the lines that go to and from your boost controller and wastegate for leaks. __________________ 86DRIVE Challenge

08-23-2013, 03:48 AM	#4
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	What kind of boost controller are u running? Is the wastegate recirculated or open to atmosphere? __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

08-23-2013, 12:54 PM	#7
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)	If you know what you are doing, disconnect the boost controller and go back to just using the wastegate. This will diagnose the problem as: 1. Boost controller malfunction Or 2. Wastegate malfunction or leak in the boost refrence hoses __________________ 86DRIVE Challenge

08-23-2013, 01:13 PM	#13
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)	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. __________________ - 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, 03:52 AM	#6
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)	im using regualer vacuum tees to connect hoses that used for water/air metal one should effect? and plastic zip ties

08-23-2013, 01:06 PM	#9
Toma Senior Member Join Date: May 2013 Drives: Viper, Mustang, FD RX7, FFR GTM Location: Calgary, AB Posts: 260 Thanks: 7 Thanked 89 Times in 52 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	What style of Vaccuum line? Cheap "silicone" rubber tends to swell and "drop" pressure. But not usually till higher boost. Keep the Vaccum lines as short as possible. Avoid "T's" that reduce inside diameter or are a restriction. I usually plumb the turbo compressor housing direct to wastegate. If it still does it.... Then either the wastegate has insufficient flow, or if the turbine section is restrictive, the timing could be too low (creates excess heat energy, has greater affect on small housings). But I like boost creep, 2-3 pounds is very nice

08-23-2013, 01:07 PM	#10
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)	the vacuum start from the intake Manifold Tees not clamped or zip tie just do you think this the cuses leaks? on 10psi?

08-23-2013, 01:11 PM	#12
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)	what can I do im using two of T brass tees that's not good at all or?

08-23-2013, 01:15 PM	#14
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)	hmm ill snap shot some and post the way im connecting the tees alright

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