O2 dump louder at idle/cruise
#1
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O2 dump louder at idle/cruise
Has anyone installed an O2 dump and noticed the car is a bit louder at idle/cruise? Seems odd but was thinking maybe the stock o2 housing muffled the sound more compared to the thinner metal of the o2 dump or I have a leak.
Also was wondering about anyone thats running a 25psi FP wastegate with an o2 dump. When do you start to hear the dump? I was cruising around and it seems like around 10psi the wastegate must be cracking open a bit because I can hear it starting to come out of the dump.
Also was wondering about anyone thats running a 25psi FP wastegate with an o2 dump. When do you start to hear the dump? I was cruising around and it seems like around 10psi the wastegate must be cracking open a bit because I can hear it starting to come out of the dump.
#2
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Make sure you're using the right gasket. The stock gasket is not divided and will allow exhaust gas to flow up from the down pipe into the wastegate port. The o2 housing should have come with a divided gasket.
This is actually a VERY common call we get because people think the WG is opening.
-Michael
This is actually a VERY common call we get because people think the WG is opening.
-Michael
Last edited by Michael @ FP; May 31, 2013 at 02:31 PM.
#5
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If you dont use a proper twin scroll gasket and it allows the dump tube to vent at idle, it's a big problem. It essentially creates a giant exhaust leak right next to the o2 sensor and it wrecks your AFR. I personally just used some copper spray with no gasket and it works wonders.
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I'll have to double-check which gasket I got then. I bought a MAPerformance 02 dump from another member and it included a gasket, but I'm not sure if it was divided or not. In the event it is NOT divided, it sounds like I'll use copper spray instead.
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#12
^What he said.
If the wastegate is open at all off-boost, you have a problem. Aside from checking the gasket, make sure that the wastegate holds pressure until its specified opening point. And as someone else said, a good way to check this is via smoke test.
If the wastegate is open at all off-boost, you have a problem. Aside from checking the gasket, make sure that the wastegate holds pressure until its specified opening point. And as someone else said, a good way to check this is via smoke test.
#14
Has anyone installed an O2 dump and noticed the car is a bit louder at idle/cruise? Seems odd but was thinking maybe the stock o2 housing muffled the sound more compared to the thinner metal of the o2 dump or I have a leak.
Also was wondering about anyone thats running a 25psi FP wastegate with an o2 dump. When do you start to hear the dump? I was cruising around and it seems like around 10psi the wastegate must be cracking open a bit because I can hear it starting to come out of the dump.
Also was wondering about anyone thats running a 25psi FP wastegate with an o2 dump. When do you start to hear the dump? I was cruising around and it seems like around 10psi the wastegate must be cracking open a bit because I can hear it starting to come out of the dump.
I run a fp fed with a 25 pound spring and a EPM 02 dump. The dump should be just as loud as your previous setup until you hit max boost setting. I have an AEM TRUE boost so I raised the crack pressure as much as I could so the boost would only "dump" at wot. On my stock turbo it obviously opened much sooner and easier but basically only under heavy or wot.
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Make sure you're using the right gasket. The stock gasket is not divided and will allow exhaust gas to flow up from the down pipe into the wastegate port. The o2 housing should have come with a divided gasket. ...This is actually a VERY common call we get because people think the WG is opening....
-Michael
-Michael
Last edited by sparky; Jun 2, 2013 at 04:46 AM.