Generic Boost Control Issues.

[majik2k5]

Just got the car back up and running again. And I seem to be having some issues with boost control. I haven't toyed in DSM Link yet, as far as airflow and fuel and so on are concerned. I'm going to let Slowboy do that.

However, I've tried this two different ways. And still can't seem to manage to reach a reasonable boost level until the car is tuned. I have a Tial 38MM external wastegate ran to the manifold, and a turboXS boost controller. I've had the boost controller hooked up, and backed all the way out, or turned all the way in, the boost still seems to be in the high 20's. I'm looking for some control around the 15psi area.

I've also tried bypassing the boost controller all together, yet, the boost still seems to climb uncontrollably into the 30+ pounds. Just curious is anyone else has any rough ideas.

If nothing else, I'll let slowboy dial the car in when I head over at the end of the month.

Thanks for any help.

 

[Spoolin98]

Just got the car back up and running again. And I seem to be having some issues with boost control. I haven't toyed in DSM Link yet, as far as airflow and fuel and so on are concerned. I'm going to let Slowboy do that.

However, I've tried this two different ways. And still can't seem to manage to reach a reasonable boost level until the car is tuned. I have a Tial 38MM external wastegate ran to the manifold, and a turboXS boost controller. I've had the boost controller hooked up, and backed all the way out, or turned all the way in, the boost still seems to be in the high 20's. I'm looking for some control around the 15psi area.

I've also tried bypassing the boost controller all together, yet, the boost still seems to climb uncontrollably into the 30+ pounds. Just curious is anyone else has any rough ideas.

If nothing else, I'll let slowboy dial the car in when I head over at the end of the month.

Thanks for any help.

If you bypassed the boost controller all together and ran a boost source right from the intake track to the wastegate, the wastgate should be opening at whatever psi spring you have in the wastegate. What spring do you have?

 

[majik2k5]

That much is understood, hence the spring should be opening at about 15 pounds of boost.

I'm running an AGP 60trim, however. With no nipple off of the turbo, or the outlet pipe anywhere. So for now, I've simply tee'd into the bov/intake manifold pressure line, and ran to the wastegate from that.

Not reccomended, I know. Boost should still be somewhat controllable though.

 

[Spoolin98]

That much is understood, hence the spring should be opening at about 15 pounds of boost.

I'm running an AGP 60trim, however. With no nipple off of the turbo, or the outlet pipe anywhere. So for now, I've simply tee'd into the bov/intake manifold pressure line, and ran to the wastegate from that.

Not reccomended, I know. Boost should still be somewhat controllable though.

Well since you just admitted your tapping a boost source from a non-recommended source, why dont you rule that out by drilling and tapping your intercooler piping as close to the turbo as possible? Then if its still acting up, move on to the next possible cause.

I would get a better boost source and see if that helps out. The wastegate should def be opening at 15lbs, like you said, if connected directly to a boost source. So either your boost source is messing things up or your wastegate isnt functioning correctly.

 

[supravw]

That much is understood, hence the spring should be opening at about 15 pounds of boost.

I'm running an AGP 60trim, however. With no nipple off of the turbo, or the outlet pipe anywhere. So for now, I've simply tee'd into the bov/intake manifold pressure line, and ran to the wastegate from that.

Not reccomended, I know. Boost should still be somewhat controllable though.

Soooo, why don't you try doing what IS recommended and get back to us?? I mean that just seems like common sense to me. You should be able to tap into the intercooler piping with a nipple and run it to the wastegate.

Does boost continue to rise? Like boost creep? Or does it go straight to 20 plus? You might want to check your spring and all that stuff on the wastegate too.

 

[majik2k5]

If you research the topic of boost control, you'll find that the preffered method is running the line from a nipple as close to the turbo as possible. However, running the boost controller as I have it ran is also acceptable. You will suffer from boost spike and so on and so forth, but that's not the issue at hand. Boost should still be controllable even with the controller ran as it is. I shouldn't be doubling the boost levels I want to run because my boost controller is ran as it is.

 

[turboglenn]

Does boost continue to rise? Like boost creep? Or does it go straight to 20 plus? You might want to check your spring and all that stuff on the wastegate too.

If you answer these questions maybe we can help. but from your description it sounds like you have a massive leak in the lines to the wastegate and or BOV. Maybe a hole in teh wastegate's diaphram?????

What kind of BC and how is it hooked up..bleeder, ball and spring..etc.etc.. pics would be even better. It sucks that there are so few vac/boost ports on teh manifold. I'm drilling about 3 spares into my spare 1g mani so a lot more things can have their own source, plus i want to "hide a few more things" to clean up the engine bay.

 

[majik2k5]

I'm running a Turbonetics Evolution external wastegate, the spring should be wide open by 15 pounds of boost. I've tried the setup a few different ways now. The boost never seems to creep, it just climbs and climbs as if there's no boost control whatsoever. I have noticed though, that below the nipple on the external wastegate, there's an opening that goes into the wastegate. The wastegate was shipped to me like that, so I thought nothing of it. Maybe that's my issue at hand?

 

[JusMX141]

I have a Tial 38MM external wastegate ran to the manifold, and a turboXS boost controller.

I'm running a Turbonetics Evolution external wastegate, the spring should be wide open by 15 pounds of boost.

Make up your mind, son! Which one is it?

Just out of curiosity....which nipple do you have the boost source hooked on the wastegate?

 

[DirtyBirdRacing]

Hi,

If it is a Tial, I think you might of hooked up the vacuum hose to the wrong nipple. On the Tial the vacuum hose/boost controler hose hooks upto the bottom port. The top port is left open to atmosphere. If you hooked it up to the top port it would make sense that the wastegate won't open, since you are "forcing it" shut and not trying to "force it" open. That make sense? Hope it helped.

Bill

 

[majik2k5]

Haha, sorry for the confusion. I didn't even realize what I said in the original post, or what I was thinking when I said it.

It is indeed a Turbonetics Evolution external wastegate. There is only one nipple, and it is on the upper portion of the wastegate. The bottom port is left open, as it was when I recieved it from slowboy. I assume that qualifies as the vacuum port on the Turbonetics wastegate?

I'm leaning towards a faulty boost controller. Unlikely, but everything else has been checked. Included boost and vacuum leaks with a smoker. I'm going to go ahead and swap out my TurboXS boost controller for a standard eBay model that worked on my previous DSM.

Wish me luck.

 

[supravw]

Well if your spring is a 15 psi spring then you should be able to take off the vaccum hose and have it open at 15 psi just because of the exhaust pressure if I'm not mistaken. Someone correct me if I'm wrong.

 

[turboglenn]

I think you should try putting teh vacum line to the bottom fitting on teh wastegate. I haven't seen teh one you're talking about in person, but usually externals have2 portd ( top and bottom ) and for most app-lications only the bottom one is used. The top one is usually only used in conjunction with teh bottom one to use "pressure differential" for supposedly better control, but even with an EBC i still run it like it was an MBC(one line to bottom fitting on wastegate)

 

[allwheelTSI]

Oh, and BTW.. Not saying it's right but my boost controller is T'd off of my BOV vacuum source and I get rock solid boost control with the cheapest of Ebay boost controllers. Besides, having wastegate boost source from the manifold takes care of those pesky pre manifold boost leaks(By overworking the turbo of course..)

 

[Spoolin98]

Do you have an air compressor? If so, with the car off, set the regulator to 15psi and shoot compressed air into the vacumm line feeding the boost source to the wastegate. Listen and see if the wastegate opens or not. That will rule out a problem.

 

[aero_sallee]

Haha, sorry for the confusion. I didn't even realize what I said in the original post, or what I was thinking when I said it.

It is indeed a Turbonetics Evolution external wastegate. There is only one nipple, and it is on the upper portion of the wastegate. The bottom port is left open, as it was when I recieved it from slowboy. I assume that qualifies as the vacuum port on the Turbonetics wastegate?

I'm leaning towards a faulty boost controller. Unlikely, but everything else has been checked. Included boost and vacuum leaks with a smoker. I'm going to go ahead and swap out my TurboXS boost controller for a standard eBay model that worked on my previous DSM.

Wish me luck.

The bottom "hole" you are referring to should be threaded for a nipple. It is the one you want to use. Unscrew the top nipple and screw it into the bottom hole and connect there. Leave the top one open. It is only used for some EBC setups as previously mentioned in this thread.
If you put pressure on the top side of the diaphram you will experience exactly the symptoms you are having.

It should have come with more than one nipple, at least summit includes several.

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