Need more power, not sure which route to take

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CarMotorBarge
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Re: Need more power, not sure which route to take

Post by CarMotorBarge » Mon Jan 30, 2017 7:00 am

I don't know for sure if the 90mm throttle body will work on the truck intake. You need to ask the manufacturer. Most everybody is using the car intakes.

Why don't you want a high lift cam? There are a ton of high lift cams in the marsh doing just fine. WT, MAST, TKE, etc. are all using high lift cams on their 550 HSP and up motors.

Also why not spin the motor up to 5500 RPMs? There is a substantial amount of additional thrust made from 5000 to 5500. If you need more thrust, this is one of the easiest ways to get it. I am not saying you need to make lots of torque above 5000, but I am saying you need the HSP to carry to at least 5500 to 5600. Ultimately HSP is what determines how much prop you spin. Not torque.
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.88 Ox Box swinging 4 blade 83.5" R
GTO Rigging and B&S Tilt Trailer

Moritz
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Re: Need more power, not sure which route to take

Post by Moritz » Fri Feb 03, 2017 8:27 pm

I have a 600hp big block with gear box for sale

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RedfireSVT
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Re: Need more power, not sure which route to take

Post by RedfireSVT » Sat Feb 04, 2017 8:02 pm

Ok, the plan is to put a cam in there (waiting on some cam specs) and going to pull the heads and have them ported along with new lifters, pushrods and anything else needed for the cam upgrade. Going to get rid of the VVT. Then a new tune and see what that does for the power. At least I have a plan so I can get started on this thing, I want to be ready by spring.
16x8' 2014 Longhorn Custom
6.0L LS Motor
80" 3 Blade Whispertip
Love it!

CarMotorBarge
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Re: Need more power, not sure which route to take

Post by CarMotorBarge » Sun Feb 05, 2017 7:42 am

Sounds like a plan. Keep us posted. You also might want to consider an AFM delete kit. Not sure if you have done this already, but you don't want the AFM on an airboat. Here is a link to an AFM delete kit:

https://www.texas-speed.com/p-717-dod-a ... gines.aspx

This kit has a lot of the parts you are going to need such as lifters, head gaskets, etc.
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.88 Ox Box swinging 4 blade 83.5" R
GTO Rigging and B&S Tilt Trailer

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RedfireSVT
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Re: Need more power, not sure which route to take

Post by RedfireSVT » Sun Feb 05, 2017 6:02 pm

I got the cage off today and I'll try and get the heads off next weekend. Not much but it's a start!

Image
16x8' 2014 Longhorn Custom
6.0L LS Motor
80" 3 Blade Whispertip
Love it!

CarMotorBarge
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Re: Need more power, not sure which route to take

Post by CarMotorBarge » Mon Feb 06, 2017 8:50 pm

Looks like you are having fun. 8)
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.88 Ox Box swinging 4 blade 83.5" R
GTO Rigging and B&S Tilt Trailer

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junglecat
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Re: Need more power, not sure which route to take

Post by junglecat » Thu Feb 09, 2017 11:54 am

Don't go too high of a lift with your cam . I have an extremely high lift , and you lose the ability of slowly idling up on fish / frogs etc. my boat actually rocks side to side . Trying to gig Talapia , they will feel it and leave before they are in range.
Jungle Cat2 2012 Panther Thunder 14'x7'9"/ LiL John Rigging
Larry Smith built 427 SBC
2.68 Ox Box
82" 3 blade R
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RedfireSVT
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Re: Need more power, not sure which route to take

Post by RedfireSVT » Thu Feb 09, 2017 5:01 pm

junglecat wrote:Don't go too high of a lift with your cam . I have an extremely high lift , and you lose the ability of slowly idling up on fish / frogs etc. my boat actually rocks side to side . Trying to gig Talapia , they will feel it and leave before they are in range.
What would you recommend on the lift?
16x8' 2014 Longhorn Custom
6.0L LS Motor
80" 3 Blade Whispertip
Love it!

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junglecat
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Re: Need more power, not sure which route to take

Post by junglecat » Thu Feb 09, 2017 11:41 pm

If I had a LS motor I'd make a call to WaterThunder. He would know a lot more than me.
Jungle Cat2 2012 Panther Thunder 14'x7'9"/ LiL John Rigging
Larry Smith built 427 SBC
2.68 Ox Box
82" 3 blade R
Citrus County Airboat Alliance Member

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RedfireSVT
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Re: Need more power, not sure which route to take

Post by RedfireSVT » Fri Feb 10, 2017 11:11 pm

I'm going to try Mast Motorsports for a cam.
16x8' 2014 Longhorn Custom
6.0L LS Motor
80" 3 Blade Whispertip
Love it!

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RedfireSVT
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Re: Need more power, not sure which route to take

Post by RedfireSVT » Thu Jan 04, 2018 4:47 pm

Update.

The boat is back together and has a custom tune that was done on the water and this thing runs great! I replaced anything and everything that I thought I should while I had the heads off, cam, high pressure oil pump, hardened push rods, trunion kit, cometic head gaskets and head studs. I'm sure I'm forgetting some things but it's solid. The boat was tuned by LSX Power tuning in Brenham, Texas and he did a great job.
16x8' 2014 Longhorn Custom
6.0L LS Motor
80" 3 Blade Whispertip
Love it!

CarMotorBarge
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Re: Need more power, not sure which route to take

Post by CarMotorBarge » Thu Jan 04, 2018 7:05 pm

Glad to hear that it turned out so well. 8)
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.88 Ox Box swinging 4 blade 83.5" R
GTO Rigging and B&S Tilt Trailer

bob_esper
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Re: Need more power, not sure which route to take

Post by bob_esper » Fri Jan 05, 2018 11:16 am

how much of a difference did it make? ive got that same motor in my 18/8 alumitech. so far i've just put a cam and spring kit in mine. what all did you replace?
2017 18.5/8 Alumitech
408 LS
2.38 stinger with 79" 3 blade ex

Moritz
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Re: Need more power, not sure which route to take

Post by Moritz » Sat Jan 06, 2018 2:11 pm

What did they charge to tune it?

loudmouse
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Re: Need more power, not sure which route to take

Post by loudmouse » Sun Jan 07, 2018 7:40 pm

I have the same engine as you. LY6. For power to $$ spent porting the heads is not where it's at. These engines with a cam and a good tune will make 560hp. A good cam, double springs, retainers & locks, pushrods, delete VVT, an oilpan from a 2010 camaro (8qts) and a tune that doesn't pull all the timing out of the engine will get you there. Aftermarket Intakes look better but not much hp gained for $$ spent. Truck intake works very good and can be smoothed for aesthetics. After the engine is right, adjust and tune the hull with jacks as mentioned above. Jack adjustment for a slightly round bottom is best for ground running IMHO. BTW small duration higher lift cams will make more power with the L92 heads than low lift longer duration cams. Also I'm a big fan of the NGR and JX blades Good luck.

A little late I guess.after I posted seen the second page. Will leave it up to helps others.
15' Alumitech deckover LSX TT Oxbox 84" JX 4-blade
Gas required Water optional :dontknow:
Built and Tuned by Me
14'X8' JW, Chevrolet 122CID LNF Turbo Engine, Ox box, 80" NGR 3 blade

Life is short, eat your dessert first! :downtown:

bob_esper
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Re: Need more power, not sure which route to take

Post by bob_esper » Mon Jan 08, 2018 9:26 am

Is there any other mods needed to run the camaro oil pan? I'm assuming that's more of a longevity item and not a performance upgrade right?
2017 18.5/8 Alumitech
408 LS
2.38 stinger with 79" 3 blade ex

loudmouse
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Re: Need more power, not sure which route to take

Post by loudmouse » Mon Jan 08, 2018 10:58 am

The pan has a by pass. Remove it and plug it off. Get the oil pickup for that pan. Install it with a new oring. Install pan. Must use the filter that has the bypass in it. Adds oil and will help with oil temps on an airboat. If you put it on and ur oil pressure has changed or fluctuates you messed up the oring when installing pickup. Fix it!!! Ebay has the pan for about $100.
15' Alumitech deckover LSX TT Oxbox 84" JX 4-blade
Gas required Water optional :dontknow:
Built and Tuned by Me
14'X8' JW, Chevrolet 122CID LNF Turbo Engine, Ox box, 80" NGR 3 blade

Life is short, eat your dessert first! :downtown:

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