Precision 5858 Turbo Issues
Jun 1, 2017, 05:33 PM
#46
EvoM Guru
iTrader: (1)
The PCV is not nearly as good at pulling pressure out of the crankcase as the intake pipe is. When I first put the red on my car, it smoked on decal and idle. No smoke at WOT.
It is also because turbo piston rings (not seals, they are literally called piston rings) work on differential pressure to keep the oil in the CHRA. At WOT, there is plenty of pressure in the turbine and comp housing to keep the oil in. When the throttle is closed, the engine is slowing down or at idle, there is little pressure in the housings. So, it doesn't take much crank case pressure to push oil out of the CHRA.
http://www.motoiq.com/MagazineArticl...eshooting.aspx
It is also because turbo piston rings (not seals, they are literally called piston rings) work on differential pressure to keep the oil in the CHRA. At WOT, there is plenty of pressure in the turbine and comp housing to keep the oil in. When the throttle is closed, the engine is slowing down or at idle, there is little pressure in the housings. So, it doesn't take much crank case pressure to push oil out of the CHRA.
http://www.motoiq.com/MagazineArticl...eshooting.aspx
Jun 2, 2017, 04:53 AM
#47
Evolved Member
Gotchya. Makes sense. Never had it happen to me, but I never had a BB turbo. Without going through the posts, does the OP have a catchcan between the valve cover and intake pipe? If so that can actually RESTRICT the flow depending on the design. If enlarging the valve cover port and hoses from the valve cover doesn't work, there is always the vac system that uses exhaust gas speed as a venturi in a spare O2 sensor port on the DP. Although I do not know how much that will pull under the conditions that are the problem. Vibrant makes at least the fittings I know.
~Jaraxle
~Jaraxle
Jun 2, 2017, 11:26 AM
#48
So I decided im gonna order one of the CFM breathers. Here's my logic: breather has the pressure "ball" and doesn't effect vacuum/idle. So at idle it'll be like the breather isn't there. So my sealed catch will grab all the oil residue while in vacuum. My plan is to retain the stock vent for the crankcase. It will be connected directly to the Intake/Turbo with a 3/8 line, no catch can will be present. Plan is to have the Intake/Turbo pull as much pressure out of the valve cover as possible through the oem crankcase vent. My hope is that whatever pressure isn't able to be pulled through the small port will be vented through the CFM breather. If anyone has any objections to this I would love to hear it. Thanks
Jun 10, 2017, 01:17 PM
#52
Update for those following this thread. I got my CFM breather and installed. Part looks amazing. Little info for those thinking of getting one. When you first install it, your car will not be happy. When the pressure ball is dry, it doesn't seal 100%. What I did was took the car out and did 5 pulls to get some oil up through the crankcase. After the 5 pulls I pulled the breather housing off and looked at it. I observed the pressure ball had a light layer of oil around it. I put the breather back on and started the car up. The idle/afr issues were gone, everything was back to normal. I'm very pleased with the product.
Here are some pics of the inside of the breather housing after the 5 pulls
Here are some pics of the inside of the breather housing after the 5 pulls
The following users liked this post:
ETS Michael (Jun 12, 2017)
The following users liked this post:
ETS Michael (Jun 12, 2017)
Jun 15, 2017, 06:40 PM
#57
Evolved Member
Update for those following this thread. I got my CFM breather and installed. Part looks amazing. Little info for those thinking of getting one. When you first install it, your car will not be happy. When the pressure ball is dry, it doesn't seal 100%. What I did was took the car out and did 5 pulls to get some oil up through the crankcase. After the 5 pulls I pulled the breather housing off and looked at it. I observed the pressure ball had a light layer of oil around it. I put the breather back on and started the car up. The idle/afr issues were gone, everything was back to normal. I'm very pleased with the product.
Here are some pics of the inside of the breather housing after the 5 pulls
Here are some pics of the inside of the breather housing after the 5 pulls
Jun 22, 2017, 06:59 PM
#59
Newbie
Thread Starter
Well I got the setup posted by Robert at ETS installed with catch cans inline and the turbo has stopped smoking. But, now the car is running a bit rich and idles rough on startup. Trying to figure out the solution to that issue, I think it may be because if the hose pulling vacuum that I attached to the intake pipe. If that's pulling vacuum and is connected to the intake, is it robbing the engine of intake air? Also, and probably unrelated, my Innovate ethdnol content gauge has begun to cycle through random numbers, not sure what that's about
Jun 23, 2017, 11:28 AM
#60
EvoM Guru
iTrader: (1)
Tune likely needs adjusted a bit because you changed how much air is going to the intake manifold for idle.