Should have installed my mbc?

[BoBbOrAzE]

Alright heres the deal, i have had a mbc yet i never installed it because i figured i never really needed it because of my stock bov. With my intake and exhaust my psi peaks somewhere above 13. Since the stocker leaks at 13 psi i figured why restrict it from climbing too high when its just going to stop there anyways. im stupid, now that i think of it i probably should definitely install it, because wouldnt i be losing a lot of power if every time i go wot it hits 13 psi then leaks all back into the turbo? I bet i could get a lot more power and much more of a pull if i installed the mbc and turned it down a little bit until i get a new bov.

Am i correct??

 

[blackGSX2g]

I wouldn't even touch your boost levels until you get a new BOV. If you turn it up and it leaks past your BOV, you aren't gaining any power and you are making your turbo work harder. On a side note, when I upgraded to a 1g BOV, my stock boost level went up to 15psi without a boost controller. Try that first and then start turning it up slowly.

 

[BoBbOrAzE]

good to know, but thats not what i was sayin, re-read it. i was saying that i am currently losing power because of my stock bov and it leaking at 13psi when im really pushing about 15psi, and that if i installed my mbc and turned it down then it would probably run much better becuase all the pressure isnt leaking out, although its at lower psi.
im asking if this is a good idea to do.

 

[oldman]

good to know, but thats not what i was sayin, re-read it. i was saying that i am currently losing power because of my stock bov and it leaking at 13psi when im really pushing about 15psi, and that if i installed my mbc and turned it down then it would probably run much better becuase all the pressure isnt leaking out, although its at lower psi.
im asking if this is a good idea to do.

That's a definite yes. Although you're not loosing metered air, assuming you're not venting, you're definitely asking the turbo to work harder to mantain the same boost level.

 

[BoBbOrAzE]

no im def not venting, but yea im gonna install this as soon as possible, this would prolly explain why my top end pull before my exhaust was so much stronger.

 

[blackGSX2g]

good to know, but thats not what i was sayin, re-read it. i was saying that i am currently losing power because of my stock bov and it leaking at 13psi when im really pushing about 15psi, and that if i installed my mbc and turned it down then it would probably run much better becuase all the pressure isnt leaking out, although its at lower psi.
im asking if this is a good idea to do.

You can't use a boost controller to lower your boost...the lowest setting your boost can be at is whatever your wastegate is set at. Since your car has a stock BSC, it has some control over boost levels. The only way to lower your boost without getting a new wastegate is to connect a hose from a pressure source directly to the wastegate. That will allow you to run at whatever the stock t-25 wastegate is set at. I have no clue what that setting is, but you could easily find out. An easier way is to spend the $40-50 and get a 1g BOV and an adaptor. Just for reference, the stock wastegate setting on my evo is 9psi.

 

[oldman]

You can't use a boost controller to lower your boost...the lowest setting your boost can be at is whatever your wastegate is set at. Since your car has a stock BSC, it has some control over boost levels. The only way to lower your boost without getting a new wastegate is to connect a hose from a pressure source directly to the wastegate.

Which can also be achieved by installing a mbc and set it at the lowest setting.

 

[blackGSX2g]

That's a definite yes. Although you're not loosing metered air, assuming you're not venting, you're definitely asking the turbo to work harder to mantain the same boost level.

If his BOV was leaking, thats after the MAs and it would be metered air...same as a boost leak at an IC coupler would be leaking metered air. You are correct in saying that it does make the turbo work alot harder though, I wouldn't drive it that way for long if you plan on driving it hard.

 

[oldman]

If his BOV was leaking, thats after the MAs and it would be metered air...same as a boost leak at an IC coupler would be leaking metered air. You are correct in saying that it does make the turbo work alot harder though, I wouldn't drive it that way for long if you plan on driving it hard.

The lost air would be recirculated back to the intake, no? I always thought a leaking bov means air leaking throught the return tube, I could be wrong though as I never experienced a leaking bov yet.

 

[4geze63]

leaking to the atmosphere thus casing a vented bov effect, effecting your airflow count

 

[BoBbOrAzE]

You can't use a boost controller to lower your boost...the lowest setting your boost can be at is whatever your wastegate is set at. Since your car has a stock BSC, it has some control over boost levels. The only way to lower your boost without getting a new wastegate is to connect a hose from a pressure source directly to the wastegate. That will allow you to run at whatever the stock t-25 wastegate is set at. I have no clue what that setting is, but you could easily find out. An easier way is to spend the $40-50 and get a 1g BOV and an adaptor. Just for reference, the stock wastegate setting on my evo is 9psi.

Your saying that i can not use a boost controller to lower my boost??? if it came stock at 9-11psi and now im over 13psi because of some bolt ons, your saying i cant take a mbc and lower it back to like 12 psi so it doesnt leak out of the bov? i dunno bout that?

and yea the reason for me lowering it is becuase for now i do not hav a bov upgrade and when im goin all out that means all that air is now leaking back into the intake/turbo from the bov and recirculating over and over until it finally reaches the optimum psi, which can not be very good for power or my turbo probably

 

[blackGSX2g]

Your saying that i can not use a boost controller to lower my boost??? if it came stock at 9-11psi and now im over 13psi because of some bolt ons, your saying i cant take a mbc and lower it back to like 12 psi so it doesnt leak out of the bov? i dunno bout that?

Your car has a BCS on it...essentially an electronic boost controller that can limit boost as the last line of defence the ECU has to control knock. This controller has no provisions for lowering boost except if your ECU picks up excessive knock. To lower your boost, you can eliminate that by just running a hose from a pressure source straight to your wastegate, instead of going to the stock BCS first. You do this anytime you install an MBC anyways, so if you COULD 'lower' your boost by installing a MBC and keeping it zeroed out, but it would be the same thing as running straight to the wastegate.