BBK Full compressor surge at only 27 psi?
Rich,
are you running an o2 dump or standard gate?
also- what are you running for boost correction?
we have only seen creep on one car that had an o2 dump where when the flapper opened the inlet to the dump side was actually being blocked by the flapper and not allowing the WG gases to exit properly... we put a megan o2 housing back on.. and it went back to normal!
cb
are you running an o2 dump or standard gate?
also- what are you running for boost correction?
we have only seen creep on one car that had an o2 dump where when the flapper opened the inlet to the dump side was actually being blocked by the flapper and not allowing the WG gases to exit properly... we put a megan o2 housing back on.. and it went back to normal!
cb
Thread Starter
Joined: Jul 2004
Posts: 4,606
Likes: 98
From: Northern Virginia
Rich,
are you running an o2 dump or standard gate?
also- what are you running for boost correction?
we have only seen creep on one car that had an o2 dump where when the flapper opened the inlet to the dump side was actually being blocked by the flapper and not allowing the WG gases to exit properly... we put a megan o2 housing back on.. and it went back to normal!
cb
are you running an o2 dump or standard gate?
also- what are you running for boost correction?
we have only seen creep on one car that had an o2 dump where when the flapper opened the inlet to the dump side was actually being blocked by the flapper and not allowing the WG gases to exit properly... we put a megan o2 housing back on.. and it went back to normal!
cb
cb
Thread Starter
Joined: Jul 2004
Posts: 4,606
Likes: 98
From: Northern Virginia
Incidentally, I can understand why CBRD voids the turbo warranty when you install this cover. There's obviously lots that can get messed up when you take the turbo apart, and that snap ring that holds the compressor housing on is quite a chore to mess with (though less so for me thanks to my kind wife giving me a hand with reinstalling it).
Newbie
Joined: Apr 2010
Posts: 66
Likes: 0
From: Caribbean
Hmm...On throttle surge eh?
I just spent 8 months developing a new gizmo that can deal with that (even below WG crack) and lot's more....
Have a look?
https://www.evolutionm.net/forums/ev...roduction.html
I just spent 8 months developing a new gizmo that can deal with that (even below WG crack) and lot's more....
Have a look?
https://www.evolutionm.net/forums/ev...roduction.html
Whoah, blasphomy!! Hopefully this helps man, I never ran into surge on mine but awesome to hear the initial comments on responsiveness vs the red & black. BBK truely is my favorite turbo for the 8/9 
Thread Starter
Joined: Jul 2004
Posts: 4,606
Likes: 98
From: Northern Virginia
Buttoned up the reinstall of the turbo with the new cover and took it for a spin. No surge. Even upping the WGDC and spiking it to 30 psi with it hitting upper 20s below 4000 rpm, still no compressor surge. I call that $75 well spent!
Thread Starter
Joined: Jul 2004
Posts: 4,606
Likes: 98
From: Northern Virginia
My bbk full failed... because of surge according to me... did less that 2000 miles...
The problem is also CBRD (Chad) get his turbos from Blouch...
Blouch said it over speeded.
I did boost it 2bar 29 psi... at 4500 feet altitude... it equals around 31 psi
Blouch said that the turbo over sped due to leaks in the pressure system.... funny they can make that claim without seeing a leak them self... I tested it and found no leaks.
The boost pipe on the intercooler did jump off a couple of times in a duration of 2 days. if its is the case... big if... I never would have thought a turbo is that fragile.
" What is compressor surge?
The surge region, located on the left-hand side of the compressor map (known as the surge line), is an area of flow instability typically caused by compressor inducer stall. The turbo should be sized so that the engine does not operate in the surge range. When turbochargers operate in surge for long periods of time, bearing failures may occur. When referencing a compressor map, the surge line is the line bordering the islands on their far left side.
Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself."
From Garret website:
Chad did try his best... but he does not build the BBK and is pending on blouch for support. Its also been months and no official report from blouch...and that is a bit low key if you ask me. Blouch also said the turbo is scrap and cant be repaired.
Then when I asked the turbo to be shipped to FP, they refused at first.
Long story short... Chad did get it shipped.
I got the turbo shipped to FP which said they can make it into a green HTA.
FP FTW! And I will support Chad again on getting some other products... but I will pass on the BBK's... in future.
The problem is also CBRD (Chad) get his turbos from Blouch...
Blouch said it over speeded.
I did boost it 2bar 29 psi... at 4500 feet altitude... it equals around 31 psi
Blouch said that the turbo over sped due to leaks in the pressure system.... funny they can make that claim without seeing a leak them self... I tested it and found no leaks.
The boost pipe on the intercooler did jump off a couple of times in a duration of 2 days. if its is the case... big if... I never would have thought a turbo is that fragile.
" What is compressor surge?
The surge region, located on the left-hand side of the compressor map (known as the surge line), is an area of flow instability typically caused by compressor inducer stall. The turbo should be sized so that the engine does not operate in the surge range. When turbochargers operate in surge for long periods of time, bearing failures may occur. When referencing a compressor map, the surge line is the line bordering the islands on their far left side.
Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself."
From Garret website:
Chad did try his best... but he does not build the BBK and is pending on blouch for support. Its also been months and no official report from blouch...and that is a bit low key if you ask me. Blouch also said the turbo is scrap and cant be repaired.
Then when I asked the turbo to be shipped to FP, they refused at first.
Long story short... Chad did get it shipped.
I got the turbo shipped to FP which said they can make it into a green HTA.
FP FTW! And I will support Chad again on getting some other products... but I will pass on the BBK's... in future.
Last edited by acssa; Mar 5, 2011 at 11:07 AM.