Lextreme II
Just call me "Lex"
- Messages
- 12,033
- Location
- City of Halos
I have been screeming why my car exhaust would smoke after a boosting. Its worst especially when blow off valve is activated. I finally solve this problem one and for all. I would like to share my experience with you.
The problem was not tuning, its not oil pressure nor its a return line. The problem was my Tial BOV was mounted little too far from the intake and the vacuum line is too long and shared by WG. During a hard acceleration the excessive pressurized air would forced back to the turbo compressor and the pressure from the compressure would force the oil of the turbo to go into the turbine and smoke from the buring of oil from the turbine and exhaust. Normally the BOV would open first and release all the pressurized air. Secondly, the Tial BOV is not adjustable and the response is little too slow forcing the pressurized air into the compressor.
I added another BOV closer to the intake pipe (closer to the maf). The smoke got little better. However, it didnt eliminate all the smoke. I decided not to share the vacuum signal from the WG and BOV. I ran a shorter dedicated BOV vacuum line and the problem solve.
What i am trying to say is that i am a happy man now. Boosting 18 psi daily.... I will be down sizing the injectors from 550cc to 450cc. The car is boosting very nice with some hestitation at around 4000 rpm. Dyno tune when i get some more money hobby money...lol
The problem was not tuning, its not oil pressure nor its a return line. The problem was my Tial BOV was mounted little too far from the intake and the vacuum line is too long and shared by WG. During a hard acceleration the excessive pressurized air would forced back to the turbo compressor and the pressure from the compressure would force the oil of the turbo to go into the turbine and smoke from the buring of oil from the turbine and exhaust. Normally the BOV would open first and release all the pressurized air. Secondly, the Tial BOV is not adjustable and the response is little too slow forcing the pressurized air into the compressor.
I added another BOV closer to the intake pipe (closer to the maf). The smoke got little better. However, it didnt eliminate all the smoke. I decided not to share the vacuum signal from the WG and BOV. I ran a shorter dedicated BOV vacuum line and the problem solve.
What i am trying to say is that i am a happy man now. Boosting 18 psi daily.... I will be down sizing the injectors from 550cc to 450cc. The car is boosting very nice with some hestitation at around 4000 rpm. Dyno tune when i get some more money hobby money...lol
