Help with boost leak
Thread Starter
Teching In
Joined: Apr 2019
Posts: 15
Likes: 1
Help with boost leak Hey guys,
I have been chasing a bunch of problem with my turbo setup. It was my first turbo build so needless to say I’m learning a lot.
It’s a 5.3 7875 and it’s only building like 6-7 psi in 2nd/3rd.
I shoved my shop vac (on blow mode) into my exhaust and couldn’t feel any leaks. So I got out the soapy water and found two small pin hole leaks pre turbo. Even after I located them they were so small I couldn’t feel the air on my hand.
I googled and it would appear I should still be able to build more boost even with a pin hole leak?
I’m planning to do my cold side too just curious how big if leak is needed to cause a problem building full boost.
I have been chasing a bunch of problem with my turbo setup. It was my first turbo build so needless to say I’m learning a lot.
It’s a 5.3 7875 and it’s only building like 6-7 psi in 2nd/3rd.
I shoved my shop vac (on blow mode) into my exhaust and couldn’t feel any leaks. So I got out the soapy water and found two small pin hole leaks pre turbo. Even after I located them they were so small I couldn’t feel the air on my hand.
I googled and it would appear I should still be able to build more boost even with a pin hole leak?
I’m planning to do my cold side too just curious how big if leak is needed to cause a problem building full boost.
Thread Starter
Teching In
Joined: Apr 2019
Posts: 15
Likes: 1
Yup fire ring installed. Answer ended up being yes.
No cold side leaks and with several pin holes in the hot side I was able to build boost. Keep in mind these pin holes I couldn’t feel the air escaping with my hand, so super small.
No cold side leaks and with several pin holes in the hot side I was able to build boost. Keep in mind these pin holes I couldn’t feel the air escaping with my hand, so super small.
Thread Starter
Teching In
Joined: Apr 2019
Posts: 15
Likes: 1
Thanks everyone. Got it figured out already.
Here is what I did for future people looking. I had a manual boost controller and a small spring in the wastegate. I put in a 10 psi spring and the bigger spring for my BOV. When changing my waste gate spring I noticed a small leak at the vband sealing surface.
I doubt the leak was causing much of an issue since I couldn’t feel it when pressurized. Now I’m building 10.5 and bleed off to like 8.5. I have a eBay intercooler so I’m gong to reference my WG off the intake and see what happens next but plenty happy with where it is at now. Thanks for the advice.
Here is what I did for future people looking. I had a manual boost controller and a small spring in the wastegate. I put in a 10 psi spring and the bigger spring for my BOV. When changing my waste gate spring I noticed a small leak at the vband sealing surface.
I doubt the leak was causing much of an issue since I couldn’t feel it when pressurized. Now I’m building 10.5 and bleed off to like 8.5. I have a eBay intercooler so I’m gong to reference my WG off the intake and see what happens next but plenty happy with where it is at now. Thanks for the advice.
