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External Gate. To Plumb, Or Not To Plumb

Roy

By Roy,
in Engines & Forced Induction

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extreme turbo manifolds Contributor

extreme turbo manifolds

Posted
Posted

run a 4" dump pipe and turn it down to 3.5" at the bottom of the firewall.

the gate needs to plumbed back so as to cause minimal interference to the flow of the exhaust.

ive got a pic somewhere of one i recently plumbed back, ill dig it up

Roy Grand Master

Roy

Posted
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Posted

Cool. Thats what im looking to do. Though 3.5" may be as big as i can get in there. Imalso going to branch it in on the upstram of the bend in the inner radius so the flow that will be causing friction as it flows around the bend isnt casuing turbulence in the branch

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
wtf that waste gate is welded in the turbo crazy.....

Not really, a lot of people do it, more when lowmounts are done and there isnt a lot of room to move.

Troy, just back off as you come past the EPA test point, one sec later get back into the loud pedal. :closedeyes:

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
holy shiet!!! my external gate is plumbed back and i have a full 3 inch exhaust with destroyed cat and one muffler. will there be a benefit for me if i make mine atmo instead of plumb back?

Its highly possible there would be a gain.

You wont know till you pull it off, depends on your exhaust, if its restrictive or not

psi Experienced

psi

Posted
Posted (edited)

my 45mm gate was atmo.. The cops pulled me up and we had a VERY loooong talk about it!

Luckily they didn't know what they were looking at, and I got away with it!

Its plumed back now, but I had a few boost issues for a while. My screamer was a 42mm pipe.

so i just joined it up near the cat. but boost was creeping very fast even on low boost.

then I went to a 50mm. It holds on low boost now. I put it down to the fact that the

gate does more work on low boost, and the extra gas was just too much for the smaller pipe.

ohh, I put a flex joint in the WG pipe, but i keep cracking the manifold

at the collector where the WG pipe feeds from.

I will be fitting a brace between the dump pipe, WG dump and engine VERY soon!

something to be mindful of..

Edited by psi

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