BOV and Boost Gauge on Same Boost Line?
BOV and Boost Gauge on Same Boost Line?
Hi everyone,
I am running an Evo 8 turbo at 24psi on a conservative tune. I am using a 9 BOV with an ETS Uicp.
I have noticed that I am getting a lot of flutter at high gear low rpm, and I have recently read that having a BOV sharing a boost line with something else, or in other words there being a T in the BOV line, will cause problems.
Is this a big deal? If so, what boost source would I use for my Boost gauge since the Bov is going into the main boost tap in the Intake manifold.
-TK
I am running an Evo 8 turbo at 24psi on a conservative tune. I am using a 9 BOV with an ETS Uicp.
I have noticed that I am getting a lot of flutter at high gear low rpm, and I have recently read that having a BOV sharing a boost line with something else, or in other words there being a T in the BOV line, will cause problems.
Is this a big deal? If so, what boost source would I use for my Boost gauge since the Bov is going into the main boost tap in the Intake manifold.
-TK
The stock MR gauge pack T's into a hose on the passenger side of the IM. Not the hose for the fpr, but the other one that is there. It's relatively short, but there is enough room to T into. Thats what I suggest, or the turbo outlet.
The guy who installed my gauges ran the hoses through the fender and into the driver side of the engine bay, so getting to the spot you mentioned on the passenger side will be quite the mission.
I guess I will have to T into the turbo outlet.
I guess I will have to T into the turbo outlet.
I have the same flutter problem but I only noticed after installed a open element cone filter. I have the MR gauge pack and tapped the same boost gauge line to install my blitz turbo timer. Could this cause flutter you are experiencing?
You want the BOV to be plumbed to the manifold. If you must 'T' anything else into that line, it needs to be something that does not create a leak. FP gauge, boost guage, FPR, and/or MAP sensor are usable. Be advised that if you are using a BOV that starts leaking under boost, and you have something like an FPR tapped into that line, it could cause trouble (depending on the design of the BOV). That's why it's best to have a dedicated signal line from BOV to manifold with nothing else on it.
The WG signal line is another one that can cause issues. Anything that controls boost (solenoid or mbc) does so by creating an air leak in the signal line. That means that if you 'T' anything else into a WG signal line, it probably won't get an accurate source of manifold pressure, which can cause real trouble. And FWIW, WG signal lines are typically plumbed to the UICP, not the manifold.
I hope this sheds some light on the what and why of good signal line routing practices.
Newbie
Joined: Apr 2010
Posts: 66
Likes: 0
From: Caribbean
The BOV does not induce on throttle surge. But replacing a leaky BOV with a good one can cause it. If u are getting on-throttle surge then your turbo is moving too much CFM for the RPM in the hi gear.
The 'flutter' is going to damage your turbo if it's happening at over 10psi or so.
Your options are:
1) Change the turbo housing/wheel to reduce the cfm from the turbo.
2) If the flutter happens above your wastegate spring preload u can use an RPM mapped EBC to 'dial out' the prob.
3) Get a hybrid Boost/BOV controller that will vent on-throttle xs cfm thru the BOV b4 surge happens.
4) Use a leaky BOV or place a controllable leak with a 1/2" ball valve from your pre throttle body intake back to your post MAF turbo intake line.
Item 4 is a patch at best while u figure out which of 1,2 or 3 u want to do. While it will solve the flutter it will also slow your spool.
The 'flutter' is going to damage your turbo if it's happening at over 10psi or so.
Your options are:
1) Change the turbo housing/wheel to reduce the cfm from the turbo.
2) If the flutter happens above your wastegate spring preload u can use an RPM mapped EBC to 'dial out' the prob.
3) Get a hybrid Boost/BOV controller that will vent on-throttle xs cfm thru the BOV b4 surge happens.
4) Use a leaky BOV or place a controllable leak with a 1/2" ball valve from your pre throttle body intake back to your post MAF turbo intake line.
Item 4 is a patch at best while u figure out which of 1,2 or 3 u want to do. While it will solve the flutter it will also slow your spool.
Trending Topics
Thanks for adding that.
By no means am I suggesting that this is the cause of your problem (which sounds like compressor surge), but having the plumbing correctly configured is a sure way to prevent unwanted issues that can create confusing situations.
By no means am I suggesting that this is the cause of your problem (which sounds like compressor surge), but having the plumbing correctly configured is a sure way to prevent unwanted issues that can create confusing situations.
Evolving Member
iTrader: (2)
Joined: Aug 2010
Posts: 287
Likes: 0
From: Gurnee, IL but currently in 29 Palms, CA
the concept is simple.
You want the bov to be plumbed to the manifold. If you must 't' anything else into that line, it needs to be something that does not create a leak. Fp gauge, boost guage, fpr, and/or map sensor are usable. Be advised that if you are using a bov that starts leaking under boost, and you have something like an fpr tapped into that line, it could cause trouble (depending on the design of the bov). That's why it's best to have a dedicated signal line from bov to manifold with nothing else on it.
The wg signal line is another one that can cause issues. Anything that controls boost (solenoid or mbc) does so by creating an air leak in the signal line. That means that if you 't' anything else into a wg signal line, it probably won't get an accurate source of manifold pressure, which can cause real trouble. And fwiw, wg signal lines are typically plumbed to the uicp, not the manifold.
I hope this sheds some light on the what and why of good signal line routing practices.
You want the bov to be plumbed to the manifold. If you must 't' anything else into that line, it needs to be something that does not create a leak. Fp gauge, boost guage, fpr, and/or map sensor are usable. Be advised that if you are using a bov that starts leaking under boost, and you have something like an fpr tapped into that line, it could cause trouble (depending on the design of the bov). That's why it's best to have a dedicated signal line from bov to manifold with nothing else on it.
The wg signal line is another one that can cause issues. Anything that controls boost (solenoid or mbc) does so by creating an air leak in the signal line. That means that if you 't' anything else into a wg signal line, it probably won't get an accurate source of manifold pressure, which can cause real trouble. And fwiw, wg signal lines are typically plumbed to the uicp, not the manifold.
I hope this sheds some light on the what and why of good signal line routing practices.
The concept is simple.
You want the BOV to be plumbed to the manifold. If you must 'T' anything else into that line, it needs to be something that does not create a leak. FP gauge, boost guage, FPR, and/or MAP sensor are usable. Be advised that if you are using a BOV that starts leaking under boost, and you have something like an FPR tapped into that line, it could cause trouble (depending on the design of the BOV). That's why it's best to have a dedicated signal line from BOV to manifold with nothing else on it.
The WG signal line is another one that can cause issues. Anything that controls boost (solenoid or mbc) does so by creating an air leak in the signal line. That means that if you 'T' anything else into a WG signal line, it probably won't get an accurate source of manifold pressure, which can cause real trouble. And FWIW, WG signal lines are typically plumbed to the UICP, not the manifold.
I hope this sheds some light on the what and why of good signal line routing practices.
You want the BOV to be plumbed to the manifold. If you must 'T' anything else into that line, it needs to be something that does not create a leak. FP gauge, boost guage, FPR, and/or MAP sensor are usable. Be advised that if you are using a BOV that starts leaking under boost, and you have something like an FPR tapped into that line, it could cause trouble (depending on the design of the BOV). That's why it's best to have a dedicated signal line from BOV to manifold with nothing else on it.
The WG signal line is another one that can cause issues. Anything that controls boost (solenoid or mbc) does so by creating an air leak in the signal line. That means that if you 'T' anything else into a WG signal line, it probably won't get an accurate source of manifold pressure, which can cause real trouble. And FWIW, WG signal lines are typically plumbed to the UICP, not the manifold.
I hope this sheds some light on the what and why of good signal line routing practices.
Thanks for the information.
I am going to separate my Bov and boost gauge. Do you have a preference for what to use as a second boost source for my boost gauge? I am probably just going to T into the line in the back that the others have mentioned is used for the MR gauge pack, but I would like to have a dedicated line if possible.
-TK
Thread
Thread Starter
Forum
Replies
Last Post
womba
Lancer How To Requests / Questions / Tips
6
Dec 10, 2010 02:03 PM
