Conversions & Swaps LSX Engines in Non-LSX Vehicles
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LSx into Jet Boat??

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Old 02-28-2011, 04:50 PM
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also did you use the stock alternator, or a gm 1 wire
Old 02-28-2011, 05:22 PM
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I'd really love to do a big inch twin turbo LSx in my TX-19. Right now though I'm at roughly 1000hp on the bottle, and I'd have to step up to a tunnel to go much faster and be safer. 115-120mph is about all a TX-19 is capable of handling "safely".
Old 03-01-2011, 07:31 AM
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Originally Posted by Chris1530
Heya Mr. Compressor Surge,
I was wondering if you could give me an idea as to the basics of what you deleted, and what you left in your harness ?.
thanks
Originally Posted by Chris1530
also did you use the stock alternator, or a gm 1 wire
Chris,
I deleted egr, evap purge, all of the O2 sensors, all of the auto transmission wires, oil level sensor, air conditioning, MAF (but re-wired in an IAT), oil pressure sensor. It really is a bare bones harness now. Also, I used the stock alternator with an fbody crank pulley and a BMR alternator mount.
Old 03-03-2011, 05:41 PM
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Thanks..

Umm is there somewhere to get an actual Truck ECM Pinout 01-02
The sticky just lists ls1's ?
Thanks again
Old 05-30-2011, 07:16 PM
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Originally Posted by gnx7
picked up a '97 Ski Centurion Elite
Mark, did you ever get this together...

gonna be BAD *** when you do!
Old 05-31-2011, 05:33 PM
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Just finished getting a carb'd 383 LS1 into my 21' Liberator - Pics and a short idle vide are here
Old 05-31-2011, 06:41 PM
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Sidenote: Anyone think those marine logs can be used for turbo setup?
Old 05-31-2011, 07:49 PM
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Originally Posted by ponjohn
Sidenote: Anyone think those marine logs can be used for turbo setup?
The logs are aluminum and are water jacketed. Im not sure how they would hold up to the heat without being cooled.
Old 06-14-2011, 11:37 AM
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Originally Posted by bigmandengo
The logs are aluminum and are water jacketed. Im not sure how they would hold up to the heat without being cooled.
I think they would hold up fine, as long as the whole weight of the turbo and plumbing is not hanging off of them. That's what I plan to do if I go turbo with mine.




Oh...and a quick update since summer is here

http://www.youtube.com/watch?v=asqvj..._order&list=UL
Old 06-15-2011, 07:34 AM
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Originally Posted by Compressor Surge
I think they would hold up fine, as long as the whole weight of the turbo and plumbing is not hanging off of them. That's what I plan to do if I go turbo with mine.




Oh...and a quick update since summer is here

http://www.youtube.com/watch?v=asqvj..._order&list=UL


POS. I can't imagine why anyone would put an LSx into a jet boat. Don't you know these things need BIG BLOCK TORQUE? At least that's what I was told when I did my conversion...


Seriously, though - are you running 1 fuel tank or two?

Last edited by FormulaZR; 06-15-2011 at 07:39 AM.
Old 06-15-2011, 09:57 AM
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Lol, I heard a bit of the same. It's fun to make people eat their words.

I have one ~15 gallon tank up in the bow.
Old 06-15-2011, 10:38 AM
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Originally Posted by Compressor Surge
Lol, I heard a bit of the same. It's fun to make people eat their words.

I have one ~15 gallon tank up in the bow.
Yep, I heard it too. Then saw them eat crow with the baby 5.7 LS1 - now with the 383 I hear nothing but crickets.

Anyway, I'm wanting to go back to EFI - but I wasn't sure how to do the fuel system with twin tanks. I'm wondering if I can just Y for the feed and return; or if that's a no-no. The feed and return remote selector is like ~$550.

On a side note - did you modify your own harness; or just buy one? Also, did you keep the factory water temp and oil pressure senders; or is that info the computer doesn't need?

Last edited by FormulaZR; 06-15-2011 at 11:38 AM.
Old 06-15-2011, 10:41 AM
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That is a lot of motor for the water. Geeezzzz!
Old 06-15-2011, 11:00 AM
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Originally Posted by Colemann
That is a lot of motor for the water. Geeezzzz!
Hate to say it, but Compressor and I are still on the small side of many jets. Both in CI and in HP.
Old 06-15-2011, 06:23 PM
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Originally Posted by FormulaZR
Yep, I heard it too. Then saw them eat crow with the baby 5.7 LS1 - now with the 383 I hear nothing but crickets.

Anyway, I'm wanting to go back to EFI - but I wasn't sure how to do the fuel system with twin tanks. I'm wondering if I can just Y for the feed and return; or if that's a no-no. The feed and return remote selector is like ~$550.

On a side note - did you modify your own harness; or just buy one? Also, did you keep the factory water temp and oil pressure senders; or is that info the computer doesn't need?
I don't see why you couldn't Y the lines with feed/return to each tank. You could just put $5 ball valves on the lines before the fuel pump to isolate the tanks. I'd love to put a big inch LS motor in mine and pull the BBC out...maybe one of these days.
Old 06-15-2011, 09:20 PM
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does it seem to get better fuel economy than before or worse? What was the previous motor?

I'm still working on my '97 Ski Centurion water ski boat with a 5.3 EFI setup, Z06 cam/springs, ported TB.
Old 06-15-2011, 09:55 PM
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Originally Posted by FormulaZR
On a side note - did you modify your own harness; or just buy one? Also, did you keep the factory water temp and oil pressure senders; or is that info the computer doesn't need?
I did my own harness. There are pics earlier in the thread. The engine needs the water temp sensor, but not the oil pressure sensor. I also got rid of the MAF, and wired in a separate IAT sensor.

Originally Posted by Colemann
That is a lot of motor for the water. Geeezzzz!
Lol. My buddy has a 535 inch BBC in his jet. That motor makes that potato chip fly.

Originally Posted by gnx7
does it seem to get better fuel economy than before or worse? What was the previous motor?

I'm still working on my '97 Ski Centurion water ski boat with a 5.3 EFI setup, Z06 cam/springs, ported TB.
I think it gets better milage....it HAS to. Less motor, and MUCH more efficient and precise fueling, spark, and combustion due to the higher CR. Not to mention it took a couple hundo lbs off the rear of the boat. Plus it idles like a dream, even with a decent sized cam. This swap is a no brainer.
http://www.youtube.com/watch?v=mo0K0PWzj-o
Old 06-16-2011, 04:53 AM
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Originally Posted by Compressor Surge
I did my own harness. There are pics earlier in the thread. The engine needs the water temp sensor, but not the oil pressure sensor. I also got rid of the MAF, and wired in a separate IAT sensor.
Gotcha - you should make me one!
Old 06-21-2011, 03:25 PM
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BOOM!

http://www.lsxtv.com/news/swap-insan...ered-jet-boat/
Old 06-28-2011, 12:03 PM
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nice! yeah summer is here and I'm still tuning and tweaking mine. this was sunday, 75.7 on gps, My best was 78.1 so far.


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