Tim Moland
Well-Known Member
Hello fellow turbo cars....
I have a lnf turbo with an upgraded Z54 turbo installed. The car makes great power, and it's pretty fast. However, I am suffering from high IAT2 temps and Knock Retard. My tuner has said he thinks the high IAT2 temps is the cause of the knock, which in turn causes the engine computer to cut timing. I'm seeing up to 8 degrees KR under full boost. My tuner wants to only see up to 2 degrees and only momentarily. I'm seeing up to 130 IAT2 temps. Keep in mind, this is with 45-50 degree ancient temps. So my temps are around 80 degrees higher then ambient.
I have the front mount heat exchanger with NACA ducts(no fans) and the stock DF intercooler. I have switched to a high flow zzp intercooler pump and have done my best to eliminate all air in the intercooler system.
Is the stock DF intercooler /heat exchanger not up to the task? I'm thinking about mounting another heat exchanger in the engine bay area below the coolant overflow and having a fan in that one. It will add more volume, and it will cool more too, especially when sitting still. Then I'm thinking the intercooler is marginal for the power im making. But I'm having a hard time finding a intercooler that has a straight through design like the stock one, but bigger. Also, I'm on 91 octane. 93 and E85 are hard to come by here.
Have you guys had any of these issues, or is my car "unique"? I did not have hptuners with the stock turbo, so I don't know if I had this issue with the stock Ko4 turbo. I'm willing to spending money to fix this problem, I just need to know where to spend it.
I have a lnf turbo with an upgraded Z54 turbo installed. The car makes great power, and it's pretty fast. However, I am suffering from high IAT2 temps and Knock Retard. My tuner has said he thinks the high IAT2 temps is the cause of the knock, which in turn causes the engine computer to cut timing. I'm seeing up to 8 degrees KR under full boost. My tuner wants to only see up to 2 degrees and only momentarily. I'm seeing up to 130 IAT2 temps. Keep in mind, this is with 45-50 degree ancient temps. So my temps are around 80 degrees higher then ambient.
I have the front mount heat exchanger with NACA ducts(no fans) and the stock DF intercooler. I have switched to a high flow zzp intercooler pump and have done my best to eliminate all air in the intercooler system.
Is the stock DF intercooler /heat exchanger not up to the task? I'm thinking about mounting another heat exchanger in the engine bay area below the coolant overflow and having a fan in that one. It will add more volume, and it will cool more too, especially when sitting still. Then I'm thinking the intercooler is marginal for the power im making. But I'm having a hard time finding a intercooler that has a straight through design like the stock one, but bigger. Also, I'm on 91 octane. 93 and E85 are hard to come by here.
Have you guys had any of these issues, or is my car "unique"? I did not have hptuners with the stock turbo, so I don't know if I had this issue with the stock Ko4 turbo. I'm willing to spending money to fix this problem, I just need to know where to spend it.