LUDELVR
04-29-2016, 09:00 PM
So here's the situation: I just had the engine rebuilt with a sleeved block, rods and lower compression pistons, a refreshed head etc. etc.
The turbo setup was a revhard log manifold, older journal bearing t3/t4 turbo with 630 injectors and running FCON. Initially, the setup made 371whp and 250ft/lbs on a dyno dynamics dyno at 16 psi of boost. It ran for an entire summer with no smoke on start up. Last year, the car started blowing smoke on start up and I took it to the shop. They pulled the turbo and said it was a blown turbo so I had that replaced.
Fast forward to this month. The turbo was replaced with a modern borg warner unit along with the downpipes and charge pipe being changed and a new motor mount with a hasport one because the turbo was hitting the stock motor mount. They dyno'd the car again and it made about the same amount of power but at around 14 psi of boost. In any case, I was supposed to pick up the car but yesterday, my tuner said that the car was again blowing smoke on start up. They looked at the new mount and found that the insert had melted because the turbo was sitting so close to it and the engine had sunk about 2 inches. My tuner is saying that this might have caused the oil drain to start backing up and causing the turbo to smoke but I've had this setup for years and I've never had issues with it smoking.
On this log manifold, the turbo does sit fairly low but there is enough of a bend for the oil to drain into the bung that was welded on the oil pan.
Now, they are making a metal insert to put into the motor mount to see if that will stop the smoke but what else could this be? Could the turbo sink low enough because of a motor mount that it would start causing oil to back up into the turbo?
It's funny though because I didn't have this issue with the stock motor mount but that eventually took a $hit because of the heat from the turbo. Could that inch or so from the material melting on the mount, cause the oil line to back up though, causing it to smoke? Seems like such a small thing.
The turbo setup was a revhard log manifold, older journal bearing t3/t4 turbo with 630 injectors and running FCON. Initially, the setup made 371whp and 250ft/lbs on a dyno dynamics dyno at 16 psi of boost. It ran for an entire summer with no smoke on start up. Last year, the car started blowing smoke on start up and I took it to the shop. They pulled the turbo and said it was a blown turbo so I had that replaced.
Fast forward to this month. The turbo was replaced with a modern borg warner unit along with the downpipes and charge pipe being changed and a new motor mount with a hasport one because the turbo was hitting the stock motor mount. They dyno'd the car again and it made about the same amount of power but at around 14 psi of boost. In any case, I was supposed to pick up the car but yesterday, my tuner said that the car was again blowing smoke on start up. They looked at the new mount and found that the insert had melted because the turbo was sitting so close to it and the engine had sunk about 2 inches. My tuner is saying that this might have caused the oil drain to start backing up and causing the turbo to smoke but I've had this setup for years and I've never had issues with it smoking.
On this log manifold, the turbo does sit fairly low but there is enough of a bend for the oil to drain into the bung that was welded on the oil pan.
Now, they are making a metal insert to put into the motor mount to see if that will stop the smoke but what else could this be? Could the turbo sink low enough because of a motor mount that it would start causing oil to back up into the turbo?
It's funny though because I didn't have this issue with the stock motor mount but that eventually took a $hit because of the heat from the turbo. Could that inch or so from the material melting on the mount, cause the oil line to back up though, causing it to smoke? Seems like such a small thing.