Stuff you need to switch over to an LSX platform.

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blazeracer

New member
spd500 said:
Low end torque really shouldnt matter much in a boat engine . The main question is how much horse power you can make at a specific RPM , and matching the impellor to that RPM/horsepower combination .
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Exactimundo!!! If I can spin that impeller at 5,000 - 6,000 rpm, that's where the torque needs to be. There is no need for tons of big block torque at 2,500 rpm on a jet boat IMO. I probably will run a B impy so I can get that pig to spin upwards of 6k rpm, then maybe try and run down some wingers on the big end.... LOL
 
spd500

spd500

New member
Here , go read this . This guy pushed his heavy pig of a hull to 79 with a stock ls motor . I think it has the torque to push a boat hull  :smile30:

http://www.performanceboats.com/jet-boats/86630-those-considering-ls-motor.html
 
spd500

spd500

New member
This guy is spinning a B pretty good with an LS motor  :smile30:
http://www.performanceboats.com/jet-boats/86919-sunkisst-tunnel-5-3-turbo.html
 
B

blazeracer

New member
FormulaZR pushed his 21 foot Liberator to 70 on GPS with four peeps in the boat and spun an A imp 5,800. He's got a built 383 LSX EFI, no power adders. I think a B will spin 6k.

My base motor will be an EFI 5.3 with a FAST intake/TB, an LS3 cam and Vette valve springs running in open loop. No need for closed loop on a boat. There was a dude with 241 heads on CL a few weeks ago too for $200. Might keep my eyes peeled for some of those when the time comes. Those or 243's. They both flow tops compared to the Tahoe/Yukon heads that will most likely be on the motor I get, unless I totally luck out and the get a GTO the day I go down there!!
 
spd500

spd500

New member
Here is a LS in a race boat  jump.gif jump.gif
http://www.performanceboats.com/jet-boats/85292-some-said-couldnt-done-ls-race-boat.html
 
spd500

spd500

New member
I might be interested in the info where you can get a package deal including the computer and harness . Most places around here are really big on core charges and sell each part separately , it kinda ruins trying to do anything like this as a swap from junkyard parts . I was looking into doing a swap into a jeep wrangler awhile back , and it was going to cost alot more than it was worth with core charges and everything .
 
Last Mohecian

Last Mohecian

Administrator
blazeracer said:
FormulaZR pushed his 21 foot Liberator to 70 on GPS with four peeps in the boat and spun an A imp 5,800. He's got a built 383 LSX EFI, no power adders. I think a B will spin 6k.

My base motor will be an EFI 5.3 with a FAST intake/TB, an LS3 cam and Vette valve springs running in open loop. No need for closed loop on a boat. There was a dude with 241 heads on CL a few weeks ago too for $200. Might keep my eyes peeled for some of those when the time comes. Those or 243's. They both flow tops compared to the Tahoe/Yukon heads that will most likely be on the motor I get, unless I totally luck out and the get a GTO the day I go down there!!
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Might look at the stock LS6 intake as well.  For what you are doing there may not be any gain form the FAST piece.  The LS6 intake was stock on all 01 and 02 F-bodies as well as Corvette.  It has larger runners than the original LS1 intake.  There are tons of them around.  I'd seriously consider putting that thing in bone stock and working the bugs out first.  Cam swap is easy to do on an LS in the boat.  You will learn a lot from the stock build to help you make a decision on what you need to improve.  What you think is the right cam/intake/head package now may change completely once you run the boat.
 
T

TintMan

New member
Motor Head said:
Yeah and you can buy 100mph jet boats all day long on eBay. I'll believe it when I see it.
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i'm with you bud!!! :smile30: hell even the race boat said he's only runnin 76. :smile29:
 
B

blazeracer

New member
And that $650 was with no core. Pick a part was $235 for the motor, computer and wiring harness separate. I would go that route but don't feel like pulling it myself.
 
Last Mohecian

Last Mohecian

Administrator
For all the non believers Wasted Income, Formula ZR & Sandeggo have documented their path with pics, video and GPS.  I fully believe their numbers.
 
B

blazeracer

New member
Last Mohican said:
blazeracer said:
FormulaZR pushed his 21 foot Liberator to 70 on GPS with four peeps in the boat and spun an A imp 5,800. He's got a built 383 LSX EFI, no power adders. I think a B will spin 6k.

My base motor will be an EFI 5.3 with a FAST intake/TB, an LS3 cam and Vette valve springs running in open loop. No need for closed loop on a boat. There was a dude with 241 heads on CL a few weeks ago too for $200. Might keep my eyes peeled for some of those when the time comes. Those or 243's. They both flow tops compared to the Tahoe/Yukon heads that will most likely be on the motor I get, unless I totally luck out and the get a GTO the day I go down there!!
Click to expand...


Might look at the stock LS6 intake as well.  For what you are doing there may not be any gain form the FAST piece.  The LS6 intake was stock on all 01 and 02 F-bodies as well as Corvette.  It has larger runners than the original LS1 intake.  There are tons of them around.  I'd seriously consider putting that thing in bone stock and working the bugs out first.  Cam swap is easy to do on an LS in the boat.  You will learn a lot from the stock build to help you make a decision on what you need to improve.  What you think is the right cam/intake/head package now may change completely once you run the boat.
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That's just based on what others have done. LS6 intake is a great upgrade also. I was reading about cam swaps the other day. You don't even have to pull the intake to swap the cam! Take off the rockers, spin the motor twice and it's ready. The lifters have retainers that will hold them up just for this purpose. I really just want a boat I can turn the key and drive and not worry about it next summer. This past summer was a headache every other weekend.
 
G

Gold Member

New member
I will bet anybody $100 that if he puts a stock LS 5.3 in his boat that it will not turn a B impeller 6,000rpm with the pump setup right.
 
spd500

spd500

New member
There have been plenty of documented cases where these motors have made huge amounts of power , I don't see where there could be much question of thier ability to perform . I have read about several that are well over 1000 horse power in NA engines , there is a thread somewhere on Performance Boats where they took a junk yard motor and put boost to it and made 1200 hp for several dyno runs .
 
spd500

spd500

New member
Motor Head said:
I will bet anybody $100 that if he puts a stock LS 5.3 in his boat that it will not turn a B impeller 6,000rpm with the pump setup right.
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Who is talking stock ? He has posted upgrades he is planning to do  ,and will probably add to the list as he goes like the rest of us do . Does anyone here have a "stock" motor ?
 
G

Gold Member

New member
I know all about these motors being able to make HP. My buddy has one with an 871 feeding it with alcohol injection and it makes over 1,000hp. We are talking stock motors I thought? The motors have good heads that flow good so yes they can make lots of HP for their size but they are still small and all the big power is made well over 6,000rpm.
 
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