Utilizing a divided housing
To keep it in a twin scroll and keep the exhaust pulses seperated, you gotta pretty much use 2 wastegates and keep them on their respective banks of cylinders. That is what I did on mine with twin 38mm wastegates. But you can use a single with the divider going all the way to the wastegate flange with a little lost efficiency. Of course either will work, but if you are going to the trouble to do a twin scroll set up I would use it to its full advantage and use 2 wastegates, one per bank of cylinders.
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
To keep it in a twin scroll and keep the exhaust pulses seperated, you gotta pretty much use 2 wastegates and keep them on their respective banks of cylinders. That is what I did on mine with twin 38mm wastegates. But you can use a single with the divider going all the way to the wastegate flange with a little lost efficiency. Of course either will work, but if you are going to the trouble to do a twin scroll set up I would use it to its full advantage and use 2 wastegates, one per bank of cylinders.
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
porche actually ran little mufflers on the wastegates of one of their cars. I just plan to dump mine as the single 4" out the fender will more than likely drown out anything the wastegates could do, lol.
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
Any issues or concerns with making sure the 2 wastegates are metering properly together? Was wondering what happens if one gate is more sensitive than the other. Do you link them togther via vacuum hoses?
TECH Resident
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From: Dubai
another stupid way around this would be to measure pressure in each exhaust manifold and account for it by fine tweaking the individual wastegates so both sides have the same pressure.
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Thread Starter
Joined: Nov 2009
Posts: 1,621
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From: THORNTON, PA (NEAR PHILLY)
Heck yeah! I am really curious to see results from the twin s256 turbos. I have been waiting for someone to try those, but was thinking it would be on a 4.8 or 5.3 motor. I love those little turbos on single 4 banger applications. Is there a build thread on it anywhere?
To answer the above question, the pulses do not merge til after the turbine wheel really.
To answer the above question, the pulses do not merge til after the turbine wheel really.
Heck yeah! I am really curious to see results from the twin s256 turbos. I have been waiting for someone to try those, but was thinking it would be on a 4.8 or 5.3 motor. I love those little turbos on single 4 banger applications. Is there a build thread on it anywhere?
To answer the above question, the pulses do not merge til after the turbine wheel really.
To answer the above question, the pulses do not merge til after the turbine wheel really.
It is my personal car that a friend and I built in my garage. Never started a build thread but here is a link that has a bunch of pictures of the progress..
Twin Turbo Corvette Build
I hit right at 400/400 to the wheels on 2 different 2.5 liter motors with 20psi and almost no timing combined with fat air fuels (both stock long block motors). Spool was very quick and both are still on the road today 7 years later. One now has 215,000 miles! I think you will be very happy with them, although on a larger motor they may die off a tad up top.
Thread Starter
Joined: Nov 2009
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From: THORNTON, PA (NEAR PHILLY)
I just looked at the bare housing, and each housing meets directly at the center of the turbine, so I guess a slight difference in pressure wont make too much a big deal as the'll equalize - at least in my mind!
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