16g and exhaust manifold

[Steelnation36]

I am getting a 16g to replace my 14b. Its in a 2nd gen. I was wondering if I will need a new exhaust manifold or o2 or whatnot. I've heard and read different things. I have a 6bolt in the car as well. I've read things for strictly 1g and 2g but I don't know if having a 6bolt and 14b in a 2g makes a difference. Thanks

 

[mindset]

The 16g should hook right up to the stock manifold and o2 housing.

 

[95blackGsTurbo]

Everything will bolt right up as long as your have a 14b and the kit already installed. If you already changed everything over for the j-pipe and everything nothing changes.

 

[JusMX141]

14B's have a 6cm2 turbine housing that will match right up to your stock 2G manifold using the OEM gasket and sealing ring.

16G's have a 7cm2 turbine housing that matches the Evo III manifold using the Evo III's OEM gasket and sealing ring.


You can port your 2G manifold to match the 7cm2 housing on the 16G turbo and it will use a 7cm2 mounting gasket, but you will not be able to use a sealing ring. Most guys elect to go this route and save some coin....a ported 2G manifold is identical to an Evo III manifold in every way.

The o2 housing question hinges on the type of 16G you're getting- your stock 2G housing would mount right up to a Small 16G or Big 16G, but an Evo III 16G turbine housing has a 2.5" outlet. You would either have to port your 2G o2 housing extensively to work on an Evo III 16G, or find an Evo III o2 housing.

 

[e85_4g63]

^ good info.

 

[BoostFrenzy]

The o2 housing question hinges on the type of 16G you're getting- your stock 2G housing would mount right up to a Small 16G or Big 16G, but an Evo III 16G turbine housing has a 2.5" outlet. You would either have to port your 2G o2 housing extensively to work on an Evo III 16G, or find an Evo III o2 housing.

And if you go to an EvoIII o2 housing, then you would also need a different type of downpipe since they are not at the same angle as one setup for a 2g o2 housing.

 

[pboglio]

Oh yeah, the 2g 02 housing port work for an EVOIII 16g is fun.

 

[JusMX141]

And if you go to an EvoIII o2 housing, then you would also need a different type of downpipe since they are not at the same angle as one setup for a 2g o2 housing.

Most of the time this slight angle difference can be taken up by the flex section on the downpipe. On a FWD this probably wouldn't even be an issue, but sometimes it'll slam the front portion of the downpipe into the side of the transfer case on AWD's. I've had to modify some early Megan Racing 3" downpipes for 2G AWD's using a sledge because an Evo III o2 housing put it too close to the transfer case for the downpipe to mount easily, but it wasn't too much of a challenge and it didn't damage the downpipe in any way that made it flow any worse. The side of the pipe facing the transfer case simply required a flat spot, that's all.

The major concern is that some aftermarket downpipes don't have a big enough flange at the o2 housing itself to fit the larger space between the studs on the Evo III o2 housing. Many of the companies are smart and use a large flange with slotted mounting holes that accepts both the 1G/2G and Evo III o2 housings, but some will fit only the 1G/2G o2 housings.

If your downpipe doesn't have slotted holes at the o2 flange and fits snugly on your 1G/2G o2 housing, it probably will not fit an Evo III o2 housing.

 

[dsm-onster]

Oh yeah, the 2g 02 housing port work for an EVOIII 16g is fun.

Totally!

 

[Steelnation36]

what if i was to get the fp race manifold would it work???

 

[JusMX141]

I believe the collector of the FP Race Manifold is spec'd to match a ported 7cm2 housing, so yeah.

 

[Redfwdsm]

I am getting a 16g to replace my 14b. Its in a 2nd gen. I was wondering if I will need a new exhaust manifold or o2 or whatnot. I've heard and read different things. I have a 6bolt in the car as well. I've read things for strictly 1g and 2g but I don't know if having a 6bolt and 14b in a 2g makes a difference. Thanks

the 14b and 16g housings are the same just the inside of the turbos are diffrent

 

[Steelnation36]

see then thats why i get confused is now i have people saying it bolts right on which i thought because the same housing then others say i may need to port my mani or get a new o2. Is porting the manifold just to allow more airflow. Does it need to be ported to allow the turbo to perform correctly or what? If thats the case i will probably just go with the FP race manifold simply because i was to get everything i can from this turbo.

I just like to have an understanding of everything before i do it. And yes ive read around but the more information i get the better in my opinion

 

[JusMX141]

the 14b and 16g housings are the same just the inside of the turbos are diffrent

Ummmm.....

14B:

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Evo III 16G:

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They may have the same bolt pattern, but they're definitely NOT the same housing. As far as interchanging the housings between the two turbos- this is possible, but you can severely bottleneck a Big 16G by using a 14B's 6cm2 turbine housing.

Actually if you want to get technical, the "inside" of the turbos are exactly the same between the 14B and 16G....the compressor wheel, compressor housing, and turbine housings are what's different.

 

[Steelnation36]

Thanks for the pictures that pretty much clears it up. Basically i need to get a new exhaust manifold or port mine if i want the 16g to run correctly. Thanks.

 

[Redfwdsm]

Thanks for the pictures that pretty much clears it up. Basically i need to get a new exhaust manifold or port mine if i want the 16g to run correctly. Thanks.

i saw a really nice one in the for sale section equal flow no external wastegate mount so you can run an internal wastegate i think it was around 250 shipped if you dont grab it i might

 

[Steelnation36]

where did you see this 16g? I looked cant find the one your talking about