Wastegate placement concerns and advice needed
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From: Fort Worth, TX
Wastegate placement concerns and advice needed
I recently got this manifold for my turbo build. This was a good deal and I didn't want to pass it up.
The welds look decent. Some of them look autogeneous almost but its hard to say since its coated. I could always go back over them with some filler passes.
I am concerned about the wastegate placement being on runner #1. It is pretty close to the collector but from my understanding the wastegate runner needs to be fed from all four runners and at an angle in the direction of the exhaust flow.
What do you more experienced guys think?
If I do need to change it my plan is to cut the wastegate runner off and patch the hole and weld a new runner right in the center of the collector.
Any advice is appreciated.
The welds look decent. Some of them look autogeneous almost but its hard to say since its coated. I could always go back over them with some filler passes.
I am concerned about the wastegate placement being on runner #1. It is pretty close to the collector but from my understanding the wastegate runner needs to be fed from all four runners and at an angle in the direction of the exhaust flow.
What do you more experienced guys think?
If I do need to change it my plan is to cut the wastegate runner off and patch the hole and weld a new runner right in the center of the collector.
Any advice is appreciated.
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Re: Wastegate placement concerns and advice needed
Hmm, construction looks pretty good, but I wouldn't ever place a wastegate there unless it was necessary for fitment reasons. It will probably work, but if you want to fix it wouldn't be a bad idea, except the patch would need to be smoothed on the inside ideally.
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From: Lower Right Hand Corner, PA
Re: Wastegate placement concerns and advice needed
That is a fairly common wastegate placement for cast manifolds.
It works best with smaller hotsides that create a lot of backpressure. Essentially the exhaust gas gets backed up behind the turbine, and it is forced to leave through the low pressure area that is the wastegate off runner 1.
Usually, the larger in turbine you go the bigger problem you have with boost creep. I have also seen issues with guys who have larger displacement engines (2.0+) who have overboost issues because when the wastegate can't evacuate enough exhaust to slow the turbine down before it reaches the desired pressure. Instead, it goes 3-4psi over, and then drops as the RPMs go up and backpressure increases (allowing the wastegate to be more efficient).
My suggestion, if you don't have space constraints, sell it, and get something with a better wastegate placement.
It works best with smaller hotsides that create a lot of backpressure. Essentially the exhaust gas gets backed up behind the turbine, and it is forced to leave through the low pressure area that is the wastegate off runner 1.
Usually, the larger in turbine you go the bigger problem you have with boost creep. I have also seen issues with guys who have larger displacement engines (2.0+) who have overboost issues because when the wastegate can't evacuate enough exhaust to slow the turbine down before it reaches the desired pressure. Instead, it goes 3-4psi over, and then drops as the RPMs go up and backpressure increases (allowing the wastegate to be more efficient).
My suggestion, if you don't have space constraints, sell it, and get something with a better wastegate placement.
Thread Starter
Honda-Tech Member
Joined: Oct 2005
Posts: 894
Likes: 1
From: Fort Worth, TX
Re: Wastegate placement concerns and advice needed
That is a fairly common wastegate placement for cast manifolds.
It works best with smaller hotsides that create a lot of backpressure. Essentially the exhaust gas gets backed up behind the turbine, and it is forced to leave through the low pressure area that is the wastegate off runner 1.
Usually, the larger in turbine you go the bigger problem you have with boost creep. I have also seen issues with guys who have larger displacement engines (2.0+) who have overboost issues because when the wastegate can't evacuate enough exhaust to slow the turbine down before it reaches the desired pressure. Instead, it goes 3-4psi over, and then drops as the RPMs go up and backpressure increases (allowing the wastegate to be more efficient).
My suggestion, if you don't have space constraints, sell it, and get something with a better wastegate placement.
It works best with smaller hotsides that create a lot of backpressure. Essentially the exhaust gas gets backed up behind the turbine, and it is forced to leave through the low pressure area that is the wastegate off runner 1.
Usually, the larger in turbine you go the bigger problem you have with boost creep. I have also seen issues with guys who have larger displacement engines (2.0+) who have overboost issues because when the wastegate can't evacuate enough exhaust to slow the turbine down before it reaches the desired pressure. Instead, it goes 3-4psi over, and then drops as the RPMs go up and backpressure increases (allowing the wastegate to be more efficient).
My suggestion, if you don't have space constraints, sell it, and get something with a better wastegate placement.
I don't think it would be hard to move the wastegate placement..Do you disagree?
The turbo is an sc44 with .63 A/R..Only gonna boost 8psi for now.
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Re: Wastegate placement concerns and advice needed
my manifold is a damn clone of yours... literally except my wg is on the other side... but I have no idea who made it
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From: Fort Worth, TX
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From: d16y8
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From: Further down the spiral, TX, usa
Re: Wastegate placement concerns and advice needed
Sounds like you shouldn't worry about it until much later in the build when you can see if it is actually affecting anything...
That or throw it out the window
That or throw it out the window
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