feadz
10-16-2011, 12:30 PM
A few days ago I noticed a different sound coming from my car at idle/ no load, at first I thought it was an exhaust leak, so I thought nothing of it. Then I noticed my car would build boost on and off, say I'd do a pull in second gear it would build 10 psi by 3.5k, then the next pull it would hit 1-3psi max.
Specifics: JGS log manifold, JGS400 w/ "Medium Spring ("8-10psi)" , HKS hi-powwwah, and AEM truboost.
-The vacuum/pressure lines to the wastegate are hooked up correctly and was running fine until the noise appeared. Not even 500 miles on this setup.
-The floating valve seat is installed between manifold and wastegate.
First thought was a boost/vacuum leak, so I grabbed my smoke testing machine and ran it through my BOV vacuum line, no smoke/leaks. I hooked up my boost leak tester to my hot pipe and charged the pipes to 20psi and it held steady, which lead me to the wastegate problem.
The initial test: Turn the car on, feel around for exhaust leaks. I didn't feel any exhaust escaping from the exhaust itself, but I did feel some exhaust coming out of the dump tube at idle. From my knowledge the wastegate should be closed on idle, so it shouldn't be venting any exhaust out, correct?
The next test: I turned the car off and I ran the smoke tester through the exhaust, the smoke started pouring out of dump tube, so I plugged the dump tube and smoke started to seep out around the wastegate/manifold flange. (The video below shows the smoke, it looks like its coming from the wastegate/dumptube flange, but it's not.) So I need to fix that leak.
http://i82.photobucket.com/albums/j273/Xntxny/1015111247a.jpg
avxmDY8Zq1U
My question is:
Should smoke be coming out of the dump tube with the car off, or should it be closed and not venting?
If it's supposed to be closed, then the only way smoke would be able to get through the wastegate to the dump tube would be if the wastegate was stuck open, right?
Specifics: JGS log manifold, JGS400 w/ "Medium Spring ("8-10psi)" , HKS hi-powwwah, and AEM truboost.
-The vacuum/pressure lines to the wastegate are hooked up correctly and was running fine until the noise appeared. Not even 500 miles on this setup.
-The floating valve seat is installed between manifold and wastegate.
First thought was a boost/vacuum leak, so I grabbed my smoke testing machine and ran it through my BOV vacuum line, no smoke/leaks. I hooked up my boost leak tester to my hot pipe and charged the pipes to 20psi and it held steady, which lead me to the wastegate problem.
The initial test: Turn the car on, feel around for exhaust leaks. I didn't feel any exhaust escaping from the exhaust itself, but I did feel some exhaust coming out of the dump tube at idle. From my knowledge the wastegate should be closed on idle, so it shouldn't be venting any exhaust out, correct?
The next test: I turned the car off and I ran the smoke tester through the exhaust, the smoke started pouring out of dump tube, so I plugged the dump tube and smoke started to seep out around the wastegate/manifold flange. (The video below shows the smoke, it looks like its coming from the wastegate/dumptube flange, but it's not.) So I need to fix that leak.
http://i82.photobucket.com/albums/j273/Xntxny/1015111247a.jpg
avxmDY8Zq1U
My question is:
Should smoke be coming out of the dump tube with the car off, or should it be closed and not venting?
If it's supposed to be closed, then the only way smoke would be able to get through the wastegate to the dump tube would be if the wastegate was stuck open, right?