Resolved Can’t boost past 8psi

[Dawson159]

My car won’t boost past 8 psi it gets to 8psi then stays there steady no boost leaks or vacuum leaks

I also took my actuator arm off and moved the wastegate and it moved freely but it acts like the wastegate is getting stuck open

I have a Hallman mbc hooked up turned all the way down it doesn’t matter if I turn it up

 

[boostdawd]

Sounds like your wastegate is the culprit. Do u have another one to try?

 

[Dawson159]

Sounds like your wastegate is the culprit. Do u have another one to try?

I do not

 

[Dawson159]

I do not

Sounds like your wastegate is the culprit. Do u have another one to try?

Wait will a Garrett t25 wastegate work?

 

[Buddy2]

You could either have faulty wastegate, actuator or incorrect wastegate preload. Check preload and if it wont work check that actuator is working properly. if this does not help take manifold off and check for any psychical damage in wastegate flapper itself. Is car boosting later than it should be? This would indicate incorrect preload or damaged flapper or manifold seals blowing by alot.

 

[Buddy2]

http://www.forcedperformance.net/merchant2/merchant.mvc?Screen=Info_wastegate

 

[Vegas Smith]

I'd check eBay or he classifieds for a wastegate instead of taking it all apart.

 

[pauleyman]

If Watergate actuator ever failed you should get infinite boost. Try these steps. Take the arm off. Wire the waste gate shut. Drive the car. Do NOT go WOT. just. Quick stab and see where boost goes. If it shoots above 8 you've got something wrong in the actuatir/control. If it went to 8 and feels faster than before you've got a problem with the boost gauge. Are the mods recent? Did it used to boost well before? What has changed? Do you have the boost controller hooked up correctly? Show us. You can rule out both the hard parts and the control in 10 minutes.

 

[Dawson159]

If Watergate actuator ever failed you should get infinite boost. Try these steps. Take the arm off. Wire the waste gate shut. Drive the car. Do NOT go WOT. just. Quick stab and see where boost goes. If it shoots above 8 you've got something wrong in the actuatir/control. If it went to 8 and feels faster than before you've got a problem with the boost gauge. Are the mods recent? Did it used to boost well before? What has changed? Do you have the boost controller hooked up correctly? Show us. You can rule out both the hard parts and the control in 10 minutes.

The mods are not recent the 16g was installed about 2 weeks ago which was the most recent one, I was driving it and it suddenly stopped going past 8psi, my ic piping blew off the same day it stopped going past 8 psi (my fault),it used to boost perfectly to 14 psi which is what I had it tuned for,the Mbc is hooked up correctly I’ll show u when I get out of bed.
I’m probably gonna remove the mbc and run wastegate pressure to elininate that as an issue next

 

[pauleyman]

Please tell me you did a boost leak check. Check the manifold to turbo bolts also

 

[Dawson159]

Please tell me you did a boost leak check. Check the manifold to turbo bolts also

I didn’t get to do anything to it today but yes I did a blt and there is no leaks

 

[Dawson159]

I didn’t get to do anything to it today but yes I did a blt and there is no leaks

Update: I took my boost controller off and it still only went to 8psi so Its definitly the wastegate actuator

 

[Dawson159]

Update: I took my boost controller off and it still only went to 8psi so Its definitly the wastegate actuator

Ended up being a broken wastegate actuator

 

[Vegas Smith]

I called it!

 

[arrowhead]

I called it!

You get the medal, congrats.