STS concerns from Performancetrucks.net
11-18-2005, 05:23 PM
#1
STS concerns from Performancetrucks.net Something to consider if you are thinking about this system....
""This was a cold weather technical bulletin from STS. Right on with Mort's post.
"There have also been some instances where condensation freezes in the exhaust system during extreme cold weather. After start-up, this frozen water melts and flows down into the wastegate body as it is exiting the tail-pipe. This water then can refreeze in the wastegate housing preventing the wastegate from opening and controlling the boost level. Caution must be used during extreme cold weather to make sure that the exhaust system, including the wastegate, is up to temperature before attempting boosted driving. It is also important to always monitor the boost levels on your boost gauge to make sure that any over-boost condition is brought under control before engine damage can occur.
If you are concerned about the possibility of the wastegate freezing in extreme cold weather, the wastegate valve seat (ring at wastegate inlet) can be removed to allow a small amount of exhaust to continually bypass through the wastegate to help prevent ice buildup within the wastegate body. Removing the wastegate valve seat should not change the vehicle’s operating boost level, however, it will increase turbo lag by approximately 500 rpm.""
""This was a cold weather technical bulletin from STS. Right on with Mort's post.
"There have also been some instances where condensation freezes in the exhaust system during extreme cold weather. After start-up, this frozen water melts and flows down into the wastegate body as it is exiting the tail-pipe. This water then can refreeze in the wastegate housing preventing the wastegate from opening and controlling the boost level. Caution must be used during extreme cold weather to make sure that the exhaust system, including the wastegate, is up to temperature before attempting boosted driving. It is also important to always monitor the boost levels on your boost gauge to make sure that any over-boost condition is brought under control before engine damage can occur.
If you are concerned about the possibility of the wastegate freezing in extreme cold weather, the wastegate valve seat (ring at wastegate inlet) can be removed to allow a small amount of exhaust to continually bypass through the wastegate to help prevent ice buildup within the wastegate body. Removing the wastegate valve seat should not change the vehicle’s operating boost level, however, it will increase turbo lag by approximately 500 rpm.""
