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3.5" SS downpipe in the works


Tim240z

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Here is a work in progress. All SS construction, 3.25" ID. I just need to pull the stock downpipe from my ZXT and bolt up the flange and 'clock' the pipe for the correct location and mark. Also need to mark the locations for the 2 O2 sensor locations, then everything can go back to my machinist for tig welding:

 

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fc248ee1.jpg

 

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This thing should let that 'spinning wheel' breathe like a somebeeatch....

 

Tim

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I'm curious how you will get that large of a pipe on the flange - Scottie barely got a 2-1/2" pipe on the flange...3" won't fit without interference from the hardware. And no one I've heard is running an exhaust bigger than 3" (except for James T).

 

Oh, your pictures didn't show up - they may show me the answers, but...

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It's not. I have no idea what that flange is that you are referring to. This is just a way to use the largest pipe possible and still bolt it up to the T3 turbo housing. The pipe will eventually be welded to that flange in the configuration shown in the first picture above.

Tim

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the tangential T4 has a v-band clamp which this is not. The on-center t4 housing has a 4bolt flange, but the bolt holes are evenly spaced 90deg apart. You can see from the pic those holes are more in a rectangular configuration. I used to run 3.5" dp on my T64 because you could get the V-band in that size. Can't say it will make much difference over 3" with such a small turbine outlet...but it sure looks cool.

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It's gonna depend on how much this works out costing. The stainless is pretty expensive stuff, and it's fairly hard to machine. As you can see the flange and the mandrel pipe is stainless!

My reasoning behind going with the 3.25 inch ID pipe is because of the bend so close to the turbo. I figure the bigger the diameter at the bend the better. I will step it back down to 3" where the exhaust hooks in to the downpipe.

I'm also putting in 2 x O2 sensor fittings, that way i can run a A/F ratio meter. I am NOT planning to put an EGR fitting in. By the time I need to smog this car again, I'll have the engine in my other 240.

Long story short: My machinist will make templates for future work, if needed.

Tim

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