I don't want boost killing my engine

[masterpah]

I have a 16G, with intake, bov and stock fuel and exhaust. I don't have a boost controller, and my boost goes up to 18lbs after 4000 rpm. One guy told me that bc could not turn my boost down, because my wg solenoid is set at that and will not allow it to go any lower. I think he does not know what he's talking about. Which mbc is best to get for under $100, and could it turn my boost down for sure, cause I don't want to destry my engine.
Please clear this up for me

 

[Enigma_Man]

Any MBC under $100 should be fine, and yes, a MBC can turn the boost lower than the stock solenoid can go.

-Jesse

 

[masterpah]

thanks, enigma man
I love this site because everybody is so helpful.

 

[forcefed98gst]

Originally posted by Enigma_Man
Any MBC under $100 should be fine, and yes, a MBC can turn the boost lower than the stock solenoid can go.

-Jesse

Huh, I was under the impression that a boost controller can't turn the boost below the stock level. I know my electronic boost controller can't do that.

 

[98TsiAWD]

Email this guy: [email protected]

He sells a MBC, vaccumm hose, and t-fitting for $25 shipped. I have it and it is awesome and never spikes.

 

[DrZiplok]

Your symptoms sound like boost creep, apparently typical for a 16G with a large exhaust and no wastegate porting.

No boost controller is going to help you if this is the case; you need to get the turbine housing off and port the wastegate opening for better flow. Check out the VFAQ and the many online resources; most shops will do this sort of basic porting for a modest fee.

 

[masterpah]

I actually have a stock exhaust, and if I get one, I'll go with 2.5" dp

 

[masterpah]

I don't even know why I put exhaust up top sorry for the confusion

 

[got traction?]

18psi on a stock fuel system,, got knock?

 

[L2RTSiAWD]

Originally posted by forcefed98gst

Huh, I was under the impression that a boost controller can't turn the boost below the stock level. I know my electronic boost controller can't do that.

A boost controller can turn the boost as low as the turbos actuator is set to go.

 

[masterpah]

Knock, I don't even want to think about it. My timing gets pulled back so bad I can actually feel the car losing power after 5000 rpm. That is why I want to turn the boost down before I destroy something, or until I get all the fuel upgrades next month.

l2rtsiawd, If the boost contoller does not work, can I mess with the wastegate actuator to set it down lower?

 

[got traction?]

I have an idea,, dont floor the car and let it hit more then 10 psi, otherwise your going to spend a nice amount of money.

 

[ItsStockOfficer]

No boost controller on the plent can set boost lower, period, the the stock wastegate setting.

Master: Your problem is boost creep. You need to get an external wastegat or a larger internal wastegate to control your boost. Your turbo is TRYING to run lower boost but it can't because your flowing more air then it can bypass.

 

[EHeye]

when the 16g was put in, did they take the BCS off and just run straight to the wastegate. If im not mistaken open wastegate, stock runs 18psi, so in turn a MBC will be able to turn down the boost.

Correct me if im wrong, im not a turbo genius.

 

[ItsStockOfficer]

Your wrong, stock is 9, and if stock was 18, 18 would be the lowest you can go....all a boost controller does is stop boost from reaching a wastegate. So if a gate opens at 9, but a MBC opens at 11, then boost wont reach the gate till 11. However, the mbc can't make MORE boost reach the gate obviously, just less.

 

[EHeye]

im not saying 18 is the lowest, im saying 18psi is what you hit on just WG, if you take out the BCS you hit 18psi. And i thought stock was 10psi, cause that was mine, at 10psi.

Anyways, anyone else?

 

[Enigma_Man]

Due to the design of the stock boost control solenoid, Yes, the MBC can allow the boost to go lower, depending on the application. You cannot go lower than the wastegate spring is set to with any application. But if you are having boost creep with the solenoid controlled wastegate, try a MBC.

If you are getting boost creep, and have the stock boost control solenoid, going with a manual boost controller will possibly eliminate the boost creep, due to allowing the wastegate to be open for longer.

The stock solenoid can't hold the wastegate open, it uses electric pulses to open and close the wastegate, and while this works for low-power applications, upgrading the turbo can make the stock setup ineffective at controlling boost. An MBC, or a well-designed electronic boost controller can help lower the boost in this situation.

-Jesse

 

[masterpah]

I'll try to build my own mbc, because it does not seem so complicated, before I actually try to buy one. I researched this subject a lot lately and would be quite satisfied for my own design. If anybody had any imputs, or instruction to what they had made, please send them to me.

Well, I'm not really sure about boost creep because everything controlling boost is stock, including the exhaust.
And what the %^9k do I do if I can't turn the boost down. I'll keep you guys informed.

 

[ItsStockOfficer]

after the ball in the mbc you have to drill a small hole or it wont work

 

[masterpah]

You mean after the hole towards the bov hose?

 

[nine5raptor]

the outlet on the wg side needs a very small hole, otherwise your wastegate will close very slowly, if at all and you will have terrible lag. If you want your boost to be lower now, just connect a line from a boost source, either on the turbo outlet elbow or from the intake mani., and run it directly to the wastegate actuator.

and no, you can't lower the boost lower than what the wastegate actuator spring will allow.

the stock system is a bleeder system. The "electronic pulses" that enigma was talking about is simply a solenoid in the line that can lower boost by closing off the line and disallowing boost to be bled off, thus opening the WG sooner.

 

[masterpah]

I'm going tee the wg hose into the bov and see what happens.
Thanks a lot nine5raptor.
I'll keep you guys informed.

 

[masterpah]

Everything worked out just fine. I teed a line between bov vacuum and the wastegate actuator line and my boost holds steady at 11lbs all the way till the redline or untill I shift. I would like to thank all that participated and took you time to listen to me. I'll leave the boost at this level until I get some fuel upgrade and SAFC.
Now, just one more question, is there any way to make the turbo spool up faster?

I'm happy for my engine

 

[masterpah]

Everything worked out just fine. I teed a line between bov vacuum and the wastegate actuator line and my boost holds steady at 11lbs all the way till the redline or untill I shift. I would like to thank all that participated and took you time to listen to me. I'll leave the boost at this level until I get some fuel upgrade and SAFC.
Now, just one more question, is there any way to make the turbo spool up faster?

I'm happy for my engine

 

[masterpah]

Sorry about the double post, my computer is acting weird.