turbo housing question

[1badturbo]

I just bought a precision 300-3051, and its setup for an external gate, it also has the divider on the exhaust housing cut out. Can someone please explain what cutting that divider does, and let me know if a o2housing mounted w/g will work for this application, and if not who sells a minfold that has a mitsu flange and accepts a tial 40mm because I can't find one for less than $900 and I'm not paying that much for a turbo manifold.

 

[92DSMErdrick]

I have the same question basically. I have a turbonetics 50 trim with a PTE housing with the divider cut out, I'm guessing this is set up for someone running a wastegate off the manifold?

 

[T9S1i]

the divider is cut for the use of internal gates to help eliminate boost creep. If you have the divider cut, but the wastegate hole welded shut then you shouldnt have a problem with a regular o2 housing on there. Just mount your wastegate on your manifold. If you have the divider cut and its setup for an external on the o2 housing then i think it'll also help with boost creep as the gasses will go through the wastegate hole, then through the cut housing out your exhaust thus bypassing the exhaust wheel. (when your wastegate isnt open). When its open i think it can go out both ways.

Bottom of this page shows the differences and explains why.
http://www.extremepsi.com/store/customer/product.php?productid=17341&cat=506&page=1

 

[DSM90AWD]

With the dividor cut, an O2-mounted W/G will not work as the exhaust will be able to bypass the turbine during spoolup (major lag issues) and when the W/G opens (if you were able to make much boost) would be less effective because exhaust from both the turbine and wastegate bypass passage would be vented.

If you really want the O2-mounted WG then you'd either:
1.) Fill in the divider with weld, have the flange machined flat.
2.) Replace the turbine housing with an uncut version (someone wih an uncut internal may even want to trade)

Buschur/RRE have been mounting Tial40s to the OEM 2G manifold (better material than the 1Gs) for years. Buschur lists this service on his site, though I'm sure other vendors (or a local shop) would do this for you

 

[1badturbo]

Ok just to clear some things up I have the tial 40, the o2housing with the 40mm flange for the o2 wastegate setup and the turbo but the wastegate hole is empty(no flaper) and the divider IS cut , would I be able to weld the hole if the flaper is not there or would the wastegate to the manifold be a better way to go and use the 02housing as a dump.

 

[DSM90AWD]

There is no way you can use the O2 as a dump with the dividor cut. Look at the situation you have. To control boost, you need to bypass exhaust from the turbine wheel via the external wastegate only.

With the flapper missing, alot of exhaust will bypass the turbine even before you boost limit is reached (if it could even be reached). If you O2 Mount the WG you need to fill in the missing divider. If you manifold mount, then you need to weld that WG passage shut so that no exhaust flows that way as all bypassed exhuast will go thru the manifold > external wastegate > dumped to ATM (or rerouted to exhaust post turbine).

Pretty odd that you ended up with a turbine housign with the divider cut and no internal WG. Kinda like the guy that sold it to you f--ed up so hope you got a good deal

 

[92DSMErdrick]

Yea i kinda got hosed with the same setup. It was def originally set up with an internal b/c the whole for the arm is welded, and i can see the cut marks for the flapper being cut off and the divider being cut out. The guy i bought it from got it that way and just never got around to using it. I think i got a pritty good deal for my turbo, just a shame that im gonna have to repalce the housing though

 

[1badturbo]

Pretty odd that you ended up with a turbine housign with the divider cut and no internal WG. Kinda like the guy that sold it to you f--ed up so hope you got a good deal

Well if you considere $435 shipped for a brand new precision 50 trim a good deal then i guess so.

 

[rjclagett]

Sorry, just realized how old the thread was.