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Resolved O2 housing/ Wastegate compatibility issues

Dreams Realized

Proven Member
353
155
Jul 23, 2018
Seattle, Washington
Alright so I just bought a Tial MVS 38 mm wastegate to clamp on to my o2 housing, when I went to go clamp the wastegate to the o2 housing I realized that the 02 housing was a larger diameter than my wastegate.

I am fairly certain I have a JMF open circulation o2 housing, but am unsure as I bought the turbo setup from a member. The OD of the housing is 2.5" and the OD of the wastegate is 2.25". Is there anything I can do here short of unbolting the o2 housing and cutting off the end and welding on a new 2.25" OD end?

I'm beyond frustrated because I was supposed to just throw the wastegate on and do a prelimanary tune before my English racing appointment on the 9th. Now I am looking at delaying that appointment until I find a shop that can weld stuff for me in Portland

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SaTx2ga

Probationary Member
16
3
Mar 4, 2021
San Antonio, Texas
Quickest fix I can think of is to get an adapter Ive seen them while searching for an o2 housing
 

DSMPT

DSM Wiseman
1,281
831
Jun 12, 2014
Japan / Mexico, Arizona
Alright so I just bought a Tial MVS 38 mm wastegate to clamp on to my o2 housing, when I went to go clamp the wastegate to the o2 housing I realized that the 02 housing was a larger diameter than my wastegate.

I am fairly certain I have a JMF open circulation o2 housing, but am unsure as I bought the turbo setup from a member. The OD of the housing is 2.5" and the OD of the wastegate is 2.25". Is there anything I can do here short of unbolting the o2 housing and cutting off the end and welding on a new 2.25" OD end?

I'm beyond frustrated because I was supposed to just throw the wastegate on and do a prelimanary tune before my English racing appointment on the 9th. Now I am looking at delaying that appointment until I find a shop that can weld stuff for me in Portland

View attachment 623866 View attachment 623867
You have a wrong size wastegate. Your O2 housing and dump pipe are designed for a 44mm MV-R or a 45mm Turbosmart gate, not for 38mm MV-S. If that's the case, your options would be, return the 38mm wastegate and get a 44mm wastegate. Or look for another O2 housing and dump pipe that have the flanges for a 38mm gate. I don't recommend swapping only flanges or using adaptors. You may have a fitment issue.
 
Last edited:

Vegas Smith

Proven Member
4,263
2,104
Dec 2, 2002
Houston, Texas
You’ll be fine running an adapter if it’s an open dump setup. If it where a recirculating setup then it has to be a perfect fit. At the very least this will get you by until your appointment.
 

DSMPT

DSM Wiseman
1,281
831
Jun 12, 2014
Japan / Mexico, Arizona
You’ll be fine running an adapter if it’s an open dump setup. If it where a recirculating setup then it has to be a perfect fit. At the very least this will get you by until your appointment.
The dump pipe is not the only issue I meant. I am not really sure if he would be able to clear everything with an adaptor w/ a clamp for both O2 housing and dump pipe side. Such as the alternator, fan, ps pump and the lower intercooler pipe etc etc on 2G's tight space.
 
Last edited:

Dreams Realized

Proven Member
353
155
Jul 23, 2018
Seattle, Washington
:oops:
Thanks guys... Boy do I feel like an idiot, I guess I will attempt to rush order a 44mm MVR from one of our vendors. Hopefully it can get here by Monday. Extreme PSI is pretty good about returns so I have no issue with that... This is literally the last thing I need to finish my setup and start playing with the ECU, so of course I grenaded myself. :banghead:
 

Dreams Realized

Proven Member
353
155
Jul 23, 2018
Seattle, Washington
Thanks again y'all!

It was the 44mm I needed. Wastegate is on and my car is officially ready for the dyno. But I missed my appointment by a day and English is incredibly busy so won't be until April 20th to get my dyno day
 
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