Wastegate piping length vs function
Thread Starter
Joined: Nov 2008
Posts: 2,423
Likes: 224
From: A-Town, Ill side
Wastegate piping length vs function I am working on figuring out wastegate placement on a twin turbo LS swapped S10. I would like to keep this as symmetrical as possible, but that means adding piping and bends to the mount for the gate. I am using schedule 10 1 1/2" bends and pipe up to Precision 46 gates. My thought so far is to drill a hole in the back side of those cast stainless turbo mounts, and go from there. Flow shouldn't be a issue at all, my question is, how does say 2 90* affect that, or will it?
My thought is since it his a clear line of flow, it shouldn't, because by the time it needs to work, it should have the same boost on it.
Does anyone have experience with having a few bends and say 4-6" of pipe getting to the gate mount?
My thought is since it his a clear line of flow, it shouldn't, because by the time it needs to work, it should have the same boost on it.
Does anyone have experience with having a few bends and say 4-6" of pipe getting to the gate mount?
I am working on figuring out wastegate placement on a twin turbo LS swapped S10. I would like to keep this as symmetrical as possible, but that means adding piping and bends to the mount for the gate. I am using schedule 10 1 1/2" bends and pipe up to Precision 46 gates. My thought so far is to drill a hole in the back side of those cast stainless turbo mounts, and go from there. Flow shouldn't be a issue at all, my question is, how does say 2 90* affect that, or will it?
My thought is since it his a clear line of flow, it shouldn't, because by the time it needs to work, it should have the same boost on it.
Does anyone have experience with having a few bends and say 4-6" of pipe getting to the gate mount?
My thought is since it his a clear line of flow, it shouldn't, because by the time it needs to work, it should have the same boost on it.
Does anyone have experience with having a few bends and say 4-6" of pipe getting to the gate mount?
Space prevented dual straight outlets to the gates, so had to add a 6" long 90 on one side.
Running a 4 port MAC valve, no matter where I have boost set (from 4psi to 22psi), it goes to that number and maintains a perfect straight graph line, for boost, on datalogs. More consistent, and more steady than my son's car, which uses CO2 for boost control, and near identical dual wastegate setup, aside from him being able to have two short, straight stand-offs that gates are v-banded to.
I know there isn't multiple bends, or dual turbos on either, but since no one else replied, figured I'd share my results.
Not the best pics, but here's my setup, and diagram of my MAC valve and reference hose routing.
FWIW, with a 3 port MAC, I still had boost creep, even with dual 44mm gates. 4 port is very sensitive, but 100% works as expected.
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Last edited by rel3rd; May 8, 2022 at 01:02 PM.
Thread Starter
Joined: Nov 2008
Posts: 2,423
Likes: 224
From: A-Town, Ill side
I appreciate the reply. I've seen cars with bends like I'm talking, but honestly, they are show cars and most probably don't get into boost let alone know if it's controllable.
I want this to be symmetrical but I really need it to be controllable 1st and foremost.
It looks like as close as it is to done, it's going back NA for now. I guess when it gets the twins, it will get Holley on it at the same time. I need it to be a truck again until I sell this rental property I have.
I want this to be symmetrical but I really need it to be controllable 1st and foremost.
It looks like as close as it is to done, it's going back NA for now. I guess when it gets the twins, it will get Holley on it at the same time. I need it to be a truck again until I sell this rental property I have.
