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Sniper EFI or stick with carb?

Old 04-11-2021, 10:33 PM
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Default Sniper EFI or stick with carb?

Iíve got single plane intakes and 850 Demon carbs for my 509s.

I was working on figuring out fuel system plumbing, pumps, etc, and was thinking maybe the Sniper EFI system would be a better choice with its O2 learning and monitoring.

Yay or nay?

Builds should be right around 600 hp.
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Old 04-12-2021, 07:22 AM
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I have always been a die hard carb guy, until I installed snipers on mine. I love it
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Old 04-12-2021, 08:18 AM
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I'll never stop telling people to go with a sniper, it has made tuning so easy, and with a closed loop system every startup, cruise, and full throttle run is perfect regardless of the weather. Plus I can record engine data and review it to diagnose any issues or improve the tune.
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Old 04-12-2021, 09:30 AM
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Iíll eventually convince myself and let go the carb wagon. I could t agree more Iím just not their yet. I just wanna get in the water! 😂
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Old 04-12-2021, 02:43 PM
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Looking at the Holley forum on FB... some people run into some serious issues.

Super Sniper is probably my focus since the ECU can do a little more, but reading recommendations for more extreme use points toward the Terminator X. Interestingly, the Terminator series is not listed under their marine offerings.

For you guys that have implemented, what do you carry for spare parts? I'd really hate to have something bite me in the arse twenty miles offshore.

I feel like I've really opened up a can of worms here!
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Old 04-12-2021, 02:55 PM
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Originally Posted by TomZ View Post
I feel like I've really opened up a can of worms here!
You did.

The Terminator X is very similar to the HP. Built in MAP and can only use Bosch style O2's.
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Old 04-12-2021, 03:04 PM
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Originally Posted by TomZ View Post
Iíve got single plane intakes and 850 Demon carbs for my 509s.

I was working on figuring out fuel system plumbing, pumps, etc, and was thinking maybe the Sniper EFI system would be a better choice with its O2 learning and monitoring.

Yay or nay?

Builds should be right around 600 hp.
It all depends on how much you want to spend.
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Old 04-12-2021, 03:14 PM
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Originally Posted by TomZ View Post

For you guys that have implemented, what do you carry for spare parts? I'd really hate to have something bite me in the arse twenty miles offshore.

I feel like I've really opened up a can of worms here!
Sarcastic.....spare parts ? Something way more dependable than carburetors ? What ? ...,,,,, :wink....lol
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Old 04-12-2021, 03:26 PM
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Spare parts..... O2 sensor maybe
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Old 04-12-2021, 04:28 PM
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Quality rigging makes a huge difference on reliability. Most of the issues on those message boards are caused from hacked in set ups including undersized power wires and bad grounds.

I donít believe the Sniper ECM is potted so thatís a weak point but havenít heard of issues yet.

High quality marine pump, properly sized fuel lines with AN fittings, and fresh wiring will eliminate 99% of the common issues.

If you toast an O2 sensor it defaults to ultra rich instead of just shutting down. The beauty of the Sniper is if you boat in consistent conditions you can lock in a map and forget about the O2 sensor altogether just like jetting a carb.
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