esorense
Active member
Hi guys, earlier this year my 1749 blew up and i replaced it with a BV43. when i installed the turbo i removed the resonator and tried cleaning out the cat as well as i was able to and put things back together. After getting a remap the power was awsome, although low end torque was way down of what the stock turbo gave me. After a few weeks i started to suspect the cat was clogging up on me, but before i had the time to check it out i had an incident under heavy load.
I was accellerating hard up a steep hill to catch up with traffic when suddenly the turbo started surging and the power dropped. Up until that point the boost had always been completely steady with absolutely no issues. Since it is surging regularly. I shortly after the incident took out the cat and removed all sign of ceramics to get rid of the restrictions, and at the same time fixed a few minor boost leaks from the system. I did at the time think the leaks was my problem, so unfortunately i did not check the exhaust turbine very well. But altough the surging did decrease it is still there and increasing in frequency again. I have done a pressure test on the system which showed no evidence of any leaks, and i have checked the cold side of the turbo for shaftplay and visible damage. All looks to be in perfect condition.
What causes are there for surging? Could the exhaust side have been damaged by excessive heat due to the clogged up cat and cause this? I have lately experienced a lot of smoke when pulling away at low rpm and at times the engine management clearly holds back on boost.
Any tips on where to start? I will do some logs as soon as i get my vcds back from a friend. First thing then i will check my n75 duty cycle and double check my vacuum lines
regards Espen
I was accellerating hard up a steep hill to catch up with traffic when suddenly the turbo started surging and the power dropped. Up until that point the boost had always been completely steady with absolutely no issues. Since it is surging regularly. I shortly after the incident took out the cat and removed all sign of ceramics to get rid of the restrictions, and at the same time fixed a few minor boost leaks from the system. I did at the time think the leaks was my problem, so unfortunately i did not check the exhaust turbine very well. But altough the surging did decrease it is still there and increasing in frequency again. I have done a pressure test on the system which showed no evidence of any leaks, and i have checked the cold side of the turbo for shaftplay and visible damage. All looks to be in perfect condition.
What causes are there for surging? Could the exhaust side have been damaged by excessive heat due to the clogged up cat and cause this? I have lately experienced a lot of smoke when pulling away at low rpm and at times the engine management clearly holds back on boost.
Any tips on where to start? I will do some logs as soon as i get my vcds back from a friend. First thing then i will check my n75 duty cycle and double check my vacuum lines
regards Espen