Question about dual wastegate manifold setup ?
I've been doing some research on T4 manifolds. I've seen a divided T4 manifold with dual wastegate setup. Classicauto was able to answer me that, reasons for dual gates, the largest being that you get to maintain *FULLY* divided runners. Even a true divided manifold will have exhaust pulses mixing in the wastegate runners where they collect - the true dual avoids that.
But I wanna know how beneficial is that in terms of response, power and reliability ? |
check the single turbo forum for this stuff
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A fully divided manifold generally means you spool much faster (200-1000 RPM quicker depending on turbo) and have far better boost control.
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http://i15.photobucket.com/albums/a3...anifold017.jpg
this is 2a+Ron 's setup, from this thread: https://www.rx7club.com/single-turbo-rx-7s-23/opinions-dual-wastegate-vs-single-807268/ he is using a 4 inch downpipe with dual Tial 44mm wastegates... you are looking 700+ dollars just in wastegates right there, and if you paid someone to make a manifold like that it would probably be like $2000 because of the labor they're great but the cost is prohibitive obviously. |
Alright and what If I were to use a 3 inch downpippe and 2 38mm wastegates ?
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Seems reasonable.
The picture posted above does not have any flex sections for the wastegates. I suspect cracking will be a problem as stainless steel moves a LOT when it's heated. |
would stainless steel move or expand even if it were ceramic coated ?
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Yep.
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So flex dump pipes would be the better alternative ?
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1 Attachment(s)
Here's a shot of my dual 38 mm setup.
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Originally Posted by Romanator
(Post 8820137)
So flex dump pipes would be the better alternative ?
I believe in 2a+ron's case he's very limited on space so flex sections probably were just too damn hard to integrate. RCCAZ - I love that setup. Saw your thread on R C C and its looking like a real monster! :) |
Originally Posted by Aaron Cake
(Post 8820092)
Seems reasonable.
The picture posted above does not have any flex sections for the wastegates. I suspect cracking will be a problem as stainless steel moves a LOT when it's heated. |
Thank you to both arghx and RCCAZ 1 for reference pics and props to both of you, very nice lookin setups, sexyness at it`s best.
RCCAZ 1 what size downpipe do you have on your setup ? |
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