Exhaust Manifold Design
12-21-2015, 08:41 AM
#1
BCICAN
Thread Starter
Exhaust Manifold Design
First off, the picture below is not my car it's only for reference.
What would be a better way of creating a collector with the 2 pipe setup shown in the picture? Would it be:
1.) Keep each bank of the motor seperate as shown using 2.5" piping or
2.) Merge both into a single 2.5" pipe?
If merged, I would think about doing it so that the far side pipe transitions into the close pipe at the 90* bend by the zip ties. This would make for (2) 2.5" pipes off each manifold and then it goes into (1) pipe just before the turbine housing. If it matters in your decision process the size of the engine is 6.2L.
What would be a better way of creating a collector with the 2 pipe setup shown in the picture? Would it be:
1.) Keep each bank of the motor seperate as shown using 2.5" piping or
2.) Merge both into a single 2.5" pipe?
If merged, I would think about doing it so that the far side pipe transitions into the close pipe at the 90* bend by the zip ties. This would make for (2) 2.5" pipes off each manifold and then it goes into (1) pipe just before the turbine housing. If it matters in your decision process the size of the engine is 6.2L.
12-21-2015, 10:34 AM
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BCICAN
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12-21-2015, 11:34 AM
#4
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Re: Exhaust Manifold Design
Your best bet will be to merge them together with a fairly shallow angle collector.
That setup is going to be incredibly sensitive to wastegate priority so start the merge a little early, come off the collector with a length of pipe preferably with a slight bend to it, and put the wastegate on the bend inline with the exhaust gases. Although you're going to need a fairly large single gate depending on boost pressure, probably 60mm.
From what I've seen with all of my FD Pro buddies refining their single turbo LS setups they've seen much more stable boost control by running 2 wastegates, one on each bank, with as much wastegate priority as possible.
That setup is going to be incredibly sensitive to wastegate priority so start the merge a little early, come off the collector with a length of pipe preferably with a slight bend to it, and put the wastegate on the bend inline with the exhaust gases. Although you're going to need a fairly large single gate depending on boost pressure, probably 60mm.
From what I've seen with all of my FD Pro buddies refining their single turbo LS setups they've seen much more stable boost control by running 2 wastegates, one on each bank, with as much wastegate priority as possible.
12-21-2015, 12:01 PM
#5
BCICAN
Thread Starter
Re: Exhaust Manifold Design
Your best bet will be to merge them together with a fairly shallow angle collector.
That setup is going to be incredibly sensitive to wastegate priority so start the merge a little early, come off the collector with a length of pipe preferably with a slight bend to it, and put the wastegate on the bend inline with the exhaust gases. Although you're going to need a fairly large single gate depending on boost pressure, probably 60mm.
From what I've seen with all of my FD Pro buddies refining their single turbo LS setups they've seen much more stable boost control by running 2 wastegates, one on each bank, with as much wastegate priority as possible.
That setup is going to be incredibly sensitive to wastegate priority so start the merge a little early, come off the collector with a length of pipe preferably with a slight bend to it, and put the wastegate on the bend inline with the exhaust gases. Although you're going to need a fairly large single gate depending on boost pressure, probably 60mm.
From what I've seen with all of my FD Pro buddies refining their single turbo LS setups they've seen much more stable boost control by running 2 wastegates, one on each bank, with as much wastegate priority as possible.
Boost will be in the 8-12 psi range. Power will be in the 5-600whp range which I think 10-12psi will get them there.
Using (2) 44mm's wouldn't be too difficult either. Though merging those back into the downpipe would be more difficult than a single 60. I could branch off each individual pipe and put a 44 before the pipes merge into one. That would give me an extra 15% capacity over the 60mm if my math is right. You think having 1 44 on each pipe would be a better idea than 1 60 on the merged pipe (all things being equal in terms of wastegate priority?) I'm guessing that's a stupid question though...more couldn't be a bad thing.
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