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

#maverick# · 06-28-2015, 05:04 AM

I have a P&L Turbo kit tuned by LJ @ FBM. I have an infamous performance EBCS.

My car runs perfect most of the time, but sometimes it will boost creep to 16 psi when I am supposed to be boosting to 14 and this causes me to start leaning out. It does only once in a while. Tonight was one of those nights. Could it be the colder weather? It shouldn't affect it since I have an EBCS.

I have no idea at this point. This car is starting to piss me off.

enjetek · 06-28-2015, 09:45 AM

Based on your post the tune is trying to stop boost at 14 psi which is good. When it is colder you should be making more power easily so then the next thing would be to check the reliability of the wastegate. I'm not too familiar with any frs/ brz kits but the concepts for fi should be the same. What is your spring set to handle? What size is the wastegate? It should be sized properly but it's good to start with those questions.

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#maverick# · 06-28-2015, 01:42 PM

Quote:

Originally Posted by enjetek

Based on your post the tune is trying to stop boost at 14 psi which is good. When it is colder you should be making more power easily so then the next thing would be to check the reliability of the wastegate. I'm not too familiar with any frs/ brz kits but the concepts for fi should be the same. What is your spring set to handle? What size is the wastegate? It should be sized properly but it's good to start with those questions.

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Its a tial 38mm with an 8psi spring however i have an electronic boost control solenoid

enjetek · 06-28-2015, 06:41 PM

Yea so now the bc and the solenoid should be opening up as needed. Unless you have a crazy big turbo where the wastegate is the bottle neck, which I don't think is the case, then there could be other issues. What size exhaust?

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#maverick# · 06-28-2015, 07:23 PM

Quote:

Originally Posted by enjetek

Yea so now the bc and the solenoid should be opening up as needed. Unless you have a crazy big turbo where the wastegate is the bottle neck, which I don't think is the case, then there could be other issues. What size exhaust?

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2.75" Its close to a 5858 with a .82 hotside it only does it sometimes which is weird.

King Tut · 06-29-2015, 10:44 AM

Can you datalog and plot the signal that is being sent to the EBCS during a normal 14 psi run and an overboost 16 psi run? Assuming you are running it with EcuTek?

#maverick# · 06-30-2015, 04:34 PM

It was doing it again last night. See the log below.

Kiske · 07-01-2015, 12:06 AM

Is the EBCS connected directly to the compressor housing? Is the 3rd EBCS port venting to atmosphere or running back to the intake?

#maverick# · 07-01-2015, 11:17 AM

Quote:

Originally Posted by Kiske

Is the EBCS connected directly to the compressor housing? Is the 3rd EBCS port venting to atmosphere or running back to the intake?

Vent to atmosphere and yes directly to the compressor housing

Kiske · 07-05-2015, 08:45 PM

It is common for it to occure only when cold becuse of the colder air resulting in more power.

Do you have a cat still? A lot of the time a system w/o backpressure will creep a bit.

#maverick# · 07-05-2015, 10:47 PM

No cats just a resonater. I had LJ just dump a bunch of fuel at it. E85 doesnt make as much power if you lean it out a lot as pump gas. Now im at 11.5 - 12 afr under full boost so its good

#maverick# · 07-19-2015, 10:13 PM

It started doing it again, let me ask you guys this, could fouled plugs or bad coilpacks be causing my leaning out issues? The car starts to lean out under boost when the engine is warmed up, it only does it sometimes, also sometimes under WOT the car kinda like jerks a little bit and the afr goes lean but after that jerk it goes back to the afr it was before.

Im starting to really fucking hate this car. Pardon the language

enjetek · 07-19-2015, 11:32 PM

bad coil packs would make the car run more rich, no? since there is no proper ignition thus not burning fuel? same for plugs since its not going bang. what about bad injectors since that supplies fuel and if they are bad you will have less gas? same goes with fuel pump but it seems like youre getting gas form the tank.

#maverick# · 07-20-2015, 04:35 AM

Wouldnt bad injectors cause it to do this all the time? Same for fuel pump. Ill have a log for you guys shortly. I just want to figure out if its mechanical or tune related

06-28-2015, 05:04 AM	#1
#maverick# Senior Member Join Date: May 2014 Drives: 2006 Pontiac GP (SOLD), 2014 FR-S Location: Chicago Posts: 378 Thanks: 296 Thanked 145 Times in 113 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Boost Creep? I have a P&L Turbo kit tuned by LJ @ FBM. I have an infamous performance EBCS. My car runs perfect most of the time, but sometimes it will boost creep to 16 psi when I am supposed to be boosting to 14 and this causes me to start leaning out. It does only once in a while. Tonight was one of those nights. Could it be the colder weather? It shouldn't affect it since I have an EBCS. I have no idea at this point. This car is starting to piss me off. __________________ "Project cars are like New Years Eve. Endless preparation, hype, a sleepless night of fun, followed promptly by massive headaches and regret." - Anonymous

06-28-2015, 06:41 PM	#4
enjetek Senior Member Join Date: Jun 2014 Drives: 93.5 supra t & prius Location: l.a. Posts: 110 Thanks: 11 Thanked 26 Times in 22 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Boost Creep? Yea so now the bc and the solenoid should be opening up as needed. Unless you have a crazy big turbo where the wastegate is the bottle neck, which I don't think is the case, then there could be other issues. What size exhaust? Sent from my iPhone using Tapatalk

06-29-2015, 10:44 AM	#6
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)	Can you datalog and plot the signal that is being sent to the EBCS during a normal 14 psi run and an overboost 16 psi run? Assuming you are running it with EcuTek? __________________ - 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

07-01-2015, 12:06 AM	#8
Kiske Senior Member Join Date: Jun 2013 Drives: RX-7 / BRZ Location: USA Posts: 2,349 Thanks: 1,031 Thanked 2,501 Times in 1,081 Posts Mentioned: 27 Post(s) Tagged: 0 Thread(s)	Is the EBCS connected directly to the compressor housing? Is the 3rd EBCS port venting to atmosphere or running back to the intake? __________________ //2013 World Rally Blue BRZ Limited FBM Turbo--gone //2018 Crystal White Pearl BRZ Ts 2.2l Harrop Supercharged

07-05-2015, 08:45 PM	#10
Kiske Senior Member Join Date: Jun 2013 Drives: RX-7 / BRZ Location: USA Posts: 2,349 Thanks: 1,031 Thanked 2,501 Times in 1,081 Posts Mentioned: 27 Post(s) Tagged: 0 Thread(s)	It is common for it to occure only when cold becuse of the colder air resulting in more power. Do you have a cat still? A lot of the time a system w/o backpressure will creep a bit. __________________ //2013 World Rally Blue BRZ Limited FBM Turbo--gone //2018 Crystal White Pearl BRZ Ts 2.2l Harrop Supercharged

06-28-2015, 09:45 AM	#2
enjetek Senior Member Join Date: Jun 2014 Drives: 93.5 supra t & prius Location: l.a. Posts: 110 Thanks: 11 Thanked 26 Times in 22 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Based on your post the tune is trying to stop boost at 14 psi which is good. When it is colder you should be making more power easily so then the next thing would be to check the reliability of the wastegate. I'm not too familiar with any frs/ brz kits but the concepts for fi should be the same. What is your spring set to handle? What size is the wastegate? It should be sized properly but it's good to start with those questions. Sent from my iPhone using Tapatalk

07-05-2015, 10:47 PM	#11
#maverick# Senior Member Join Date: May 2014 Drives: 2006 Pontiac GP (SOLD), 2014 FR-S Location: Chicago Posts: 378 Thanks: 296 Thanked 145 Times in 113 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	No cats just a resonater. I had LJ just dump a bunch of fuel at it. E85 doesnt make as much power if you lean it out a lot as pump gas. Now im at 11.5 - 12 afr under full boost so its good __________________ "Project cars are like New Years Eve. Endless preparation, hype, a sleepless night of fun, followed promptly by massive headaches and regret." - Anonymous

07-19-2015, 10:13 PM	#12
#maverick# Senior Member Join Date: May 2014 Drives: 2006 Pontiac GP (SOLD), 2014 FR-S Location: Chicago Posts: 378 Thanks: 296 Thanked 145 Times in 113 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It started doing it again, let me ask you guys this, could fouled plugs or bad coilpacks be causing my leaning out issues? The car starts to lean out under boost when the engine is warmed up, it only does it sometimes, also sometimes under WOT the car kinda like jerks a little bit and the afr goes lean but after that jerk it goes back to the afr it was before. Im starting to really fucking hate this car. Pardon the language __________________ "Project cars are like New Years Eve. Endless preparation, hype, a sleepless night of fun, followed promptly by massive headaches and regret." - Anonymous Last edited by #maverick#; 07-19-2015 at 10:36 PM.

07-19-2015, 11:32 PM	#13
enjetek Senior Member Join Date: Jun 2014 Drives: 93.5 supra t & prius Location: l.a. Posts: 110 Thanks: 11 Thanked 26 Times in 22 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	bad coil packs would make the car run more rich, no? since there is no proper ignition thus not burning fuel? same for plugs since its not going bang. what about bad injectors since that supplies fuel and if they are bad you will have less gas? same goes with fuel pump but it seems like youre getting gas form the tank.

07-20-2015, 04:35 AM	#14
#maverick# Senior Member Join Date: May 2014 Drives: 2006 Pontiac GP (SOLD), 2014 FR-S Location: Chicago Posts: 378 Thanks: 296 Thanked 145 Times in 113 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Wouldnt bad injectors cause it to do this all the time? Same for fuel pump. Ill have a log for you guys shortly. I just want to figure out if its mechanical or tune related __________________ "Project cars are like New Years Eve. Endless preparation, hype, a sleepless night of fun, followed promptly by massive headaches and regret." - Anonymous

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