under hatch pictures turbo setups
05-28-2020 | 08:27 AM
#11
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Not sure why Patrick (phughes69) hasn't replied so I'll answer for him. He is running waste gates to control the boost pressure. You have 2 choices, waste gates or drilling a hole in exhaust housing to bleed some of the exhaust out. Without either your boost pressure will be excessive. I tried it and giving the throttles a half throttle blip jumped the pressure to 15psi so in fear of doing damage I never gave it more throttle until I installed the waste gates. The original Mercruiser/Banks 475 package using RayJay turbos controlled pressure with a 3/4" diameter hole in the exhaust housing which yielded about 4 or 5psi.
Andy
Andy
05-28-2020 | 10:15 AM
#14
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From: Michigan
check300
looks clean set up
are you running any waste gates on hot side?
I had some 12mm stainless adaptor place laser cut for the imco powerplus manifolds and have ordered 90 degree sch10 S/S elbows, I'll have a crack at fabricating the riser from exhaust manifolds to turbo, will use V-band clamp so can move turbo around to get in correct position. This will push the turbos approx. 8" back from there current on centre location,
Forgot had some aero race/imco /? double skinned water cooled pipes put away few years ago, so they would come off turbo, and get me close to inside of transom. At present from where turbo is mounted I have 1200mm (47") length to transom and pipes are 36" long
at least got the cooling issue covered
pic uploaded shortly
looks clean set up
are you running any waste gates on hot side?
I had some 12mm stainless adaptor place laser cut for the imco powerplus manifolds and have ordered 90 degree sch10 S/S elbows, I'll have a crack at fabricating the riser from exhaust manifolds to turbo, will use V-band clamp so can move turbo around to get in correct position. This will push the turbos approx. 8" back from there current on centre location,
Forgot had some aero race/imco /? double skinned water cooled pipes put away few years ago, so they would come off turbo, and get me close to inside of transom. At present from where turbo is mounted I have 1200mm (47") length to transom and pipes are 36" long
at least got the cooling issue covered
pic uploaded shortly
I ran 60 mm wastegates because my turbos were big and wanted to go to 50# of boost. I had adjustable boost with a key switch that allowed 12, 24 and 28 lbs of boost.
05-28-2020 | 10:26 AM
#15
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Joined: Jan 2005
Posts: 1,157
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From: Owen Sound Ont.
This is a project of a friend of mine
23' Caravelle with Vw/Audi twin turbo V6 with Arneson drive
Had it wet a couple of times, struggling with the computer and ABS/traction control delete issues
Should be fun when the bugs are worked out
23' Caravelle with Vw/Audi twin turbo V6 with Arneson drive
Had it wet a couple of times, struggling with the computer and ABS/traction control delete issues
Should be fun when the bugs are worked out
05-28-2020 | 01:15 PM
#16
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Joined: Dec 2001
Posts: 2,127
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From: St. Clair Shores, MI
Phughes69--I'm doing a Gentry twin turbo/twin engine boat. I bought the set but there was NO instructions or diagrams. Where are you getting your water for the intercoolers? Some have said they have a forced water pickup and they only get water while underway, others have tied them to their raw water pump. What's your setup and are you happy with it?
05-28-2020 | 01:23 PM
#17
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Joined: Dec 2001
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From: St. Clair Shores, MI
Like Andy said, the exhaust housings are 1.0 A/R. I spoke with a guy who was looking for the 1.3 A/R housings and the picture he sent me, the exhaust side was much wider. Aas far as boost goes. I adjusted the waste gates so I could get 15 psi of boost. It did not work well and I wrecked the center bearing in the turbo. I think at 15 psi the turbo is spinning too fast, which caused the bearing to fail. My next twin turbo setup, Im going to dial the turbos in for about 5psi of boost. When I build the turbo engines for my 377 Scarab, I'm going to put a speed pickup on the turbos so I know what they are actually spinning at.
06-06-2020 | 07:06 PM
#18
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From: Mt Martha Australia
Check300
what size turbos, and brand are you running on the 572"?
I had a look on another post and looks like the wastegates are vented to water cooler exhaust before it exists through transom, is this correct or are they vented to atmosphere through the hatch vent?
The key setup on dial a boost is nice setup
Phughes69
are your waste gates vented to atmosphere under hatch?
what size turbos, and brand are you running on the 572"?
I had a look on another post and looks like the wastegates are vented to water cooler exhaust before it exists through transom, is this correct or are they vented to atmosphere through the hatch vent?
The key setup on dial a boost is nice setup
Phughes69
are your waste gates vented to atmosphere under hatch?
06-06-2020 | 08:54 PM
#19
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Joined: Jul 2001
Posts: 355
Likes: 43
From: Michigan
Check300
what size turbos, and brand are you running on the 572"?
I had a look on another post and looks like the wastegates are vented to water cooler exhaust before it exists through transom, is this correct or are they vented to atmosphere through the hatch vent?
The key setup on dial a boost is nice setup
Phughes69
are your waste gates vented to atmosphere under hatch?
what size turbos, and brand are you running on the 572"?
I had a look on another post and looks like the wastegates are vented to water cooler exhaust before it exists through transom, is this correct or are they vented to atmosphere through the hatch vent?
The key setup on dial a boost is nice setup
Phughes69
are your waste gates vented to atmosphere under hatch?
06-06-2020 | 11:39 PM
#20
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Joined: Dec 2001
Posts: 2,127
Likes: 171
From: St. Clair Shores, MI
On my 377 Scarab the wastegates dump into the thru prop exhaust inlets on the TRS transom assembly. On my 30' Scarab I think I'm going to have the wastgates dump back into the exhaust just after the turbo. My only concern will be how the turbulence may affect the O2's
