No power

[tarasstjean]

I have a 2017 Supra SA 450. Our dealer diagnosed a faulty fuel pump and so we had it changed. Upon return I still can't reach surf speed and I've tried 6 different props. Currently running an ACME 2775 15x12.5. Should be tons of prop. Question, what else do I start looking at? Faulty ECU, spark plugs coils? I'm fairly mechanically inclined but I just need some new thoughts.

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[HFarr]

What suggestions did the dealer have about that? What year is it?

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[HFarr]

What suggestions did the dealer have about that? What year is it?

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Duh, nevermind I am blind. I see you said 2017. Have you ever had plugs changed?

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[HFarr]

12.5 is a super low pitch. What rpm are you running when trying to hit surf speed?

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[tarasstjean]

235 hours but I don't know if they've been changed. I thought about that. It wouldn't hurt to do it that's for sure.

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[tarasstjean]

I can't hit surf speed. I can get close it I fully deploy the center tab. RPMs are higher than I thought they should be. It would be really close to 4000 rpm at 11.0 mph. I've tried ACME 2247, OJ 950, OJ V4 1919, ACME 1235. it seems that now they've changed the fuel pump it's running harder and higher RPM. I just can't figure it out.

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[HFarr]

I would change plugs as my first choice. I have a 400 with a 15.5 x 15 pitch on a Malai. With 4k of full ballast plus 8 people I can easily hit surf speeds of 11.2 at 3200-3250 rpm. The 450 should have no trouble at all if running right.

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[larry_arizona]

OP how much ballast and Human weight are you running?

Also what elevation are you at?

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[tarasstjean]

I'm in central Alberta at 2100 to 2300ft. Full ballast is 3500lbs and we had 4 adults and 6 kids in the boat. I tried a couple 14 pitch props and there's no way I'm getting close to surf speed. There's and issue here for sure. Does anyone know how to check the Catalytics converters? I bore scoped on top but that wouldn't show any issues. Does the bottom clamp need to be pulled to inspect the upstream Cats?

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[larry_arizona]

Rough total weight of 4 adults and 6 kids?

Where are they sitting in boat? Any lead?

Elevation is hurting a little bit.


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