3400 Grand Am GT Build

[Mark02GAGT]

Yep charge pipes will be 2.5" so 65mm will be perfect. Thanks for the info on the compression ratio.

Here's the bung on the DP, I'm thinking this one would be for the o2 sensor but maybe I'm wrong (top);

[ghrarhg]

Those look like external waste gate connections that have been plugged to me. In the pic immediately above, the top bung is definitely an O2 sensor location. The lower connection may have been for the discharge side of the waste gate.

[Mark02GAGT]

Cool, thanks. I was under the impression that the wastegate should go before the turbo..no? That's what I thought the plugged pipe was for on the crossover.

[AaronGTR]

Well, yeah... if it's an external waste gate it would have a port on the manifold before the turbo, but then it would have to have a port going back into the exhaust somewhere (usually the DP). The what that is welded on there though, it definitely wouldn't be the best angle for a waste gate merge tube. Looks kinda small for one too. Hard to say.

[Mark02GAGT]

Received a little package today