My Twin Turbo Pontoon :)
07-05-2016 | 09:41 AM
#1
Thread Starter
Registered
Joined: Dec 2013
Posts: 358
Likes: 2
From: Minneapolis, Mn
My Twin Turbo Pontoon :)
Yes you read the title right, I have built a twin turbo LS pontoon.
Go back 4yrs and I built this(http://www.offshoreonly.com/forums/r...oon-build.html) I/O pontoon as a low cost but still nice pontoon. Like everything things snowballed and with my wife blowing the motor out of it last fall I figured time to upgrade, and since this is all “her” fault I get one chance todo it right.
I started last fall by stripping the boat down and flipping it over, then winter came and I had to put a hold on it till spring so I began doing motor work. Once spring came I got the toon brought home so I could install the new center toon, and bigger lifting strakes on the outer toons. After having the toon for 4 yrs and getting sick and tired of clean and polishing the toons I deiced I was going to paint them black. So while the boat was flipped I painted the outside of the toons black and from the water line down I used a product called Gator Glide, its used on the bottom of Air Boats and holds up amazingly well.
I knew I wanted a V8 but I wanted something different, something that wasn’t the norm in the Marine industry, so I bought a “junk yard” 5.3l LS rebuilt it over the winter along with making some improvments to handle the power. The bottom end is stock as far as pistons, rods go. Bearing clearance were opend up a little along with ring end gap. It received a LS9 cam and yellow spring, and melling high volume oil pump, rest is stock(will come back to bight me in the ass)
Next was onto the turbo, and intake. I picked up a set of turbonetics 62mm turbos and went to town wrapping the exhaust housings in so the could be water cooled.
I also had to make a adapter to go from the PCM manifolds to the T3 flange of the turbo.
Along with this I made a Custom alum intake manifold with a water to air intercooler, have well over 80hrs into just the intake alone.
Next up was to keep the engine cool I need some kind of sea water pump. After looking at the aftermarket I deiced to just build my own, and with that I designed, machined and tested a 2 stage pump.
I knew all along I wanted to run EFI, having spend sometime with Holley system I decided to go that route, as I could run there 7.5 LCD display and get rid of most of my gauges.
After fitting with the Holley System to get the boat running for 2 weeks I finally figured out the my coil sub harness was wire from the factory backwards, instead of 1357 it was 7531. Flipped them fired up and idle perfectly. After about 3 late nights with no sleep I finally go it buttoned up enough to go do some water testing. We have a cabin in northern MN and were planning on spending the week before 4th of July up there so I figured that would be a good time to work the bugs out.(which it was).
No onto the lake testing, first time out was a success did some tuning brought it up to 3krpm, noticed water in the motor area and head back. Turns when I took off the merccathode I forgot to plug the hole(no big deal). No videos was to busy watching everything
Next day went thru double check everything and went and did some more tuning. This time I pushed it upto 5100 rpms and got me a speed of 54mph.(all right I’m liking this)
https://www.youtube.com/watch?v=wt0zSFNnT0Q
To make a long story short spend the week on the pontoon most of it idling around the lake drinking a few cold ones, when everyone was off the boat I was able to open it up a few times and see what she would do.
Well I need a bigger lake to safely do that. Best I could do was 67mph and 5800rpm Swing a 21P 3 blade Marige Prop. Its super trim sensitive in corners but if you’re going straight and give her the beans the turbo’s come on at about 4500rpm and she pulls hard from there on out.
https://www.youtube.com/watch?v=_evzDbJoaKU
I have a few things to fix, anything over 5000rpm she will blow the coolant out, I shouldn’t have run the stock head bolts but I wanted to try anyways, so motor is coming back out and the LS9 head gaskets and ARP studs were waiting for me when I got home. Need to finish the motor cover and install the Bimini top and get rid of the old ragged one I have from my fishing toon.
Going to run thru the prop exhaust as it’s a little louder then I like when the family is on the boat, and also need to make twin wall pipes when I do the thru the prop.
Best picture from the weekend, my almost 2yrs will kick me out the chair as she wants to drive.
Go back 4yrs and I built this(http://www.offshoreonly.com/forums/r...oon-build.html) I/O pontoon as a low cost but still nice pontoon. Like everything things snowballed and with my wife blowing the motor out of it last fall I figured time to upgrade, and since this is all “her” fault I get one chance todo it right.
I started last fall by stripping the boat down and flipping it over, then winter came and I had to put a hold on it till spring so I began doing motor work. Once spring came I got the toon brought home so I could install the new center toon, and bigger lifting strakes on the outer toons. After having the toon for 4 yrs and getting sick and tired of clean and polishing the toons I deiced I was going to paint them black. So while the boat was flipped I painted the outside of the toons black and from the water line down I used a product called Gator Glide, its used on the bottom of Air Boats and holds up amazingly well.
I knew I wanted a V8 but I wanted something different, something that wasn’t the norm in the Marine industry, so I bought a “junk yard” 5.3l LS rebuilt it over the winter along with making some improvments to handle the power. The bottom end is stock as far as pistons, rods go. Bearing clearance were opend up a little along with ring end gap. It received a LS9 cam and yellow spring, and melling high volume oil pump, rest is stock(will come back to bight me in the ass)
Next was onto the turbo, and intake. I picked up a set of turbonetics 62mm turbos and went to town wrapping the exhaust housings in so the could be water cooled.
I also had to make a adapter to go from the PCM manifolds to the T3 flange of the turbo.
Along with this I made a Custom alum intake manifold with a water to air intercooler, have well over 80hrs into just the intake alone.
Next up was to keep the engine cool I need some kind of sea water pump. After looking at the aftermarket I deiced to just build my own, and with that I designed, machined and tested a 2 stage pump.
I knew all along I wanted to run EFI, having spend sometime with Holley system I decided to go that route, as I could run there 7.5 LCD display and get rid of most of my gauges.
After fitting with the Holley System to get the boat running for 2 weeks I finally figured out the my coil sub harness was wire from the factory backwards, instead of 1357 it was 7531. Flipped them fired up and idle perfectly. After about 3 late nights with no sleep I finally go it buttoned up enough to go do some water testing. We have a cabin in northern MN and were planning on spending the week before 4th of July up there so I figured that would be a good time to work the bugs out.(which it was).
No onto the lake testing, first time out was a success did some tuning brought it up to 3krpm, noticed water in the motor area and head back. Turns when I took off the merccathode I forgot to plug the hole(no big deal). No videos was to busy watching everything
Next day went thru double check everything and went and did some more tuning. This time I pushed it upto 5100 rpms and got me a speed of 54mph.(all right I’m liking this)
https://www.youtube.com/watch?v=wt0zSFNnT0Q
To make a long story short spend the week on the pontoon most of it idling around the lake drinking a few cold ones, when everyone was off the boat I was able to open it up a few times and see what she would do.
Well I need a bigger lake to safely do that. Best I could do was 67mph and 5800rpm Swing a 21P 3 blade Marige Prop. Its super trim sensitive in corners but if you’re going straight and give her the beans the turbo’s come on at about 4500rpm and she pulls hard from there on out.
https://www.youtube.com/watch?v=_evzDbJoaKU
I have a few things to fix, anything over 5000rpm she will blow the coolant out, I shouldn’t have run the stock head bolts but I wanted to try anyways, so motor is coming back out and the LS9 head gaskets and ARP studs were waiting for me when I got home. Need to finish the motor cover and install the Bimini top and get rid of the old ragged one I have from my fishing toon.
Going to run thru the prop exhaust as it’s a little louder then I like when the family is on the boat, and also need to make twin wall pipes when I do the thru the prop.
Best picture from the weekend, my almost 2yrs will kick me out the chair as she wants to drive.
07-05-2016 | 10:36 AM
#3
Platinum Member
Joined: Mar 2005
Posts: 1,044
Likes: 3
From: Bethel Island, CA
Yes you read the title right, I have built a twin turbo LS pontoon.
Go back 4yrs and I built this(http://www.offshoreonly.com/forums/r...oon-build.html) I/O pontoon as a low cost but still nice pontoon. Like everything things snowballed and with my wife blowing the motor out of it last fall I figured time to upgrade, and since this is all “her” fault I get one chance todo it right.
I started last fall by stripping the boat down and flipping it over, then winter came and I had to put a hold on it till spring so I began doing motor work. Once spring came I got the toon brought home so I could install the new center toon, and bigger lifting strakes on the outer toons. After having the toon for 4 yrs and getting sick and tired of clean and polishing the toons I deiced I was going to paint them black. So while the boat was flipped I painted the outside of the toons black and from the water line down I used a product called Gator Glide, its used on the bottom of Air Boats and holds up amazingly well.
I knew I wanted a V8 but I wanted something different, something that wasn’t the norm in the Marine industry, so I bought a “junk yard” 5.3l LS rebuilt it over the winter along with making some improvments to handle the power. The bottom end is stock as far as pistons, rods go. Bearing clearance were opend up a little along with ring end gap. It received a LS9 cam and yellow spring, and melling high volume oil pump, rest is stock(will come back to bight me in the ass)
Next was onto the turbo, and intake. I picked up a set of turbonetics 62mm turbos and went to town wrapping the exhaust housings in so the could be water cooled.
I also had to make a adapter to go from the PCM manifolds to the T3 flange of the turbo.
Along with this I made a Custom alum intake manifold with a water to air intercooler, have well over 80hrs into just the intake alone.
Next up was to keep the engine cool I need some kind of sea water pump. After looking at the aftermarket I deiced to just build my own, and with that I designed, machined and tested a 2 stage pump.
I knew all along I wanted to run EFI, having spend sometime with Holley system I decided to go that route, as I could run there 7.5 LCD display and get rid of most of my gauges.
After fitting with the Holley System to get the boat running for 2 weeks I finally figured out the my coil sub harness was wire from the factory backwards, instead of 1357 it was 7531. Flipped them fired up and idle perfectly. After about 3 late nights with no sleep I finally go it buttoned up enough to go do some water testing. We have a cabin in northern MN and were planning on spending the week before 4th of July up there so I figured that would be a good time to work the bugs out.(which it was).
No onto the lake testing, first time out was a success did some tuning brought it up to 3krpm, noticed water in the motor area and head back. Turns when I took off the merccathode I forgot to plug the hole(no big deal). No videos was to busy watching everything
Next day went thru double check everything and went and did some more tuning. This time I pushed it upto 5100 rpms and got me a speed of 54mph.(all right I’m liking this)
https://www.youtube.com/watch?v=wt0zSFNnT0Q
To make a long story short spend the week on the pontoon most of it idling around the lake drinking a few cold ones, when everyone was off the boat I was able to open it up a few times and see what she would do.
Well I need a bigger lake to safely do that. Best I could do was 67mph and 5800rpm Swing a 21P 3 blade Marige Prop. Its super trim sensitive in corners but if you’re going straight and give her the beans the turbo’s come on at about 4500rpm and she pulls hard from there on out.
https://www.youtube.com/watch?v=_evzDbJoaKU
I have a few things to fix, anything over 5000rpm she will blow the coolant out, I shouldn’t have run the stock head bolts but I wanted to try anyways, so motor is coming back out and the LS9 head gaskets and ARP studs were waiting for me when I got home. Need to finish the motor cover and install the Bimini top and get rid of the old ragged one I have from my fishing toon.
Going to run thru the prop exhaust as it’s a little louder then I like when the family is on the boat, and also need to make twin wall pipes when I do the thru the prop.
Best picture from the weekend, my almost 2yrs will kick me out the chair as she wants to drive.
Go back 4yrs and I built this(http://www.offshoreonly.com/forums/r...oon-build.html) I/O pontoon as a low cost but still nice pontoon. Like everything things snowballed and with my wife blowing the motor out of it last fall I figured time to upgrade, and since this is all “her” fault I get one chance todo it right.
I started last fall by stripping the boat down and flipping it over, then winter came and I had to put a hold on it till spring so I began doing motor work. Once spring came I got the toon brought home so I could install the new center toon, and bigger lifting strakes on the outer toons. After having the toon for 4 yrs and getting sick and tired of clean and polishing the toons I deiced I was going to paint them black. So while the boat was flipped I painted the outside of the toons black and from the water line down I used a product called Gator Glide, its used on the bottom of Air Boats and holds up amazingly well.
I knew I wanted a V8 but I wanted something different, something that wasn’t the norm in the Marine industry, so I bought a “junk yard” 5.3l LS rebuilt it over the winter along with making some improvments to handle the power. The bottom end is stock as far as pistons, rods go. Bearing clearance were opend up a little along with ring end gap. It received a LS9 cam and yellow spring, and melling high volume oil pump, rest is stock(will come back to bight me in the ass)
Next was onto the turbo, and intake. I picked up a set of turbonetics 62mm turbos and went to town wrapping the exhaust housings in so the could be water cooled.
I also had to make a adapter to go from the PCM manifolds to the T3 flange of the turbo.
Along with this I made a Custom alum intake manifold with a water to air intercooler, have well over 80hrs into just the intake alone.
Next up was to keep the engine cool I need some kind of sea water pump. After looking at the aftermarket I deiced to just build my own, and with that I designed, machined and tested a 2 stage pump.
I knew all along I wanted to run EFI, having spend sometime with Holley system I decided to go that route, as I could run there 7.5 LCD display and get rid of most of my gauges.
After fitting with the Holley System to get the boat running for 2 weeks I finally figured out the my coil sub harness was wire from the factory backwards, instead of 1357 it was 7531. Flipped them fired up and idle perfectly. After about 3 late nights with no sleep I finally go it buttoned up enough to go do some water testing. We have a cabin in northern MN and were planning on spending the week before 4th of July up there so I figured that would be a good time to work the bugs out.(which it was).
No onto the lake testing, first time out was a success did some tuning brought it up to 3krpm, noticed water in the motor area and head back. Turns when I took off the merccathode I forgot to plug the hole(no big deal). No videos was to busy watching everything
Next day went thru double check everything and went and did some more tuning. This time I pushed it upto 5100 rpms and got me a speed of 54mph.(all right I’m liking this)
https://www.youtube.com/watch?v=wt0zSFNnT0Q
To make a long story short spend the week on the pontoon most of it idling around the lake drinking a few cold ones, when everyone was off the boat I was able to open it up a few times and see what she would do.
Well I need a bigger lake to safely do that. Best I could do was 67mph and 5800rpm Swing a 21P 3 blade Marige Prop. Its super trim sensitive in corners but if you’re going straight and give her the beans the turbo’s come on at about 4500rpm and she pulls hard from there on out.
https://www.youtube.com/watch?v=_evzDbJoaKU
I have a few things to fix, anything over 5000rpm she will blow the coolant out, I shouldn’t have run the stock head bolts but I wanted to try anyways, so motor is coming back out and the LS9 head gaskets and ARP studs were waiting for me when I got home. Need to finish the motor cover and install the Bimini top and get rid of the old ragged one I have from my fishing toon.
Going to run thru the prop exhaust as it’s a little louder then I like when the family is on the boat, and also need to make twin wall pipes when I do the thru the prop.
Best picture from the weekend, my almost 2yrs will kick me out the chair as she wants to drive.
07-05-2016 | 01:50 PM
#6
Registered
Joined: Jun 2010
Posts: 1,119
Likes: 2
From: Central IL / Green Bay, WI
I love it. That's friggin awesome.
I have the Holley setup also, and it's a killer EFI unit.
However, I can assure you that stock bottom 5.3 is on borrowed time....been there done that several times. lol.
I have the Holley setup also, and it's a killer EFI unit.
However, I can assure you that stock bottom 5.3 is on borrowed time....been there done that several times. lol.
