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T4 twin scroll 4 into 1 merge collector design help

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Old 10-12-2016, 05:51 AM
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Default T4 twin scroll 4 into 1 merge collector design help

I have no experience from the actual fabrication of it.
need insight from fabricators.

Is my design right?

i placed a 3mm thick(red) plate between the ports to separate the exhaust gases., i know for fact that these should not merge in a twinscroll design

attached are the pictures.









Old 10-12-2016, 11:06 AM
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Default Re: T4 twin scroll 4 into 1 merge collector design help

why not just cut the two pipes on one side each and do it the tradition method?
Old 10-15-2016, 03:12 PM
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Default Re: T4 twin scroll 4 into 1 merge collector design help

Make two 2-1 collectors and then weld them onto the flange at an angle.

This is the collector I made for my manifold.


Old 10-17-2016, 05:36 AM
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Default Re: T4 twin scroll 4 into 1 merge collector design help

Thankyou so much aluthman! how many lbs of boost are you running?

i found this on youtube






Last edited by carlowerks; 10-17-2016 at 06:03 AM.
Old 10-20-2016, 03:58 PM
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Default Re: T4 twin scroll 4 into 1 merge collector design help

Right now I'm still on the base tune at about 23psi. Eventually I'll end up in the high 20s or low 30s depending on how the turbo responds. EFRs don't like being overspun, so I have to be careful.
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