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Old 11-03-2017, 01:46 AM
Black'nGreen
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6000GDI motor: What is the optimum RPM for surfing?

Looking for some input on what RPM range is the best for surfing my boat. I have a 2017 XT21 with the 6000GDI motor. We run 3K in ballast. Elevation is 700 ft. Currently we run at 3100 fps to get 10 mph. It does not feel like the motor is lugging, but peak torque is 479 ft lbs @ 4000 rpm. Should I consider reproping to move closer to the peak torque output level? Do I want to go all the way to 4K rpm? Impact on gph? Thanks in advance for your wisdom.
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Old 11-03-2017, 10:37 AM
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Originally Posted by Black 'n Green View Post
Looking for some input on what RPM range is the best for surfing my boat. I have a 2017 XT21 with the 6000GDI motor. We run 3K in ballast. Elevation is 700 ft. Currently we run at 3100 fps to get 10 mph. It does not feel like the motor is lugging, but peak torque is 479 ft lbs @ 4000 rpm. Should I consider reproping to move closer to the peak torque output level? Do I want to go all the way to 4K rpm? Impact on gph? Thanks in advance for your wisdom.
Whoa, that is quite a motor in the XT21! I have it in my XT23. If you re-prop and surf at 4k RPM your boat is going to top out at like 20mph. I wouldn't change anything.
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Old 11-03-2017, 10:51 AM
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All you are going to do is make it drink a lot more fuel if you do that!!!
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Old 11-03-2017, 11:22 AM
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There is no way that you should need or want to reprop that boat. My X23 with the 6.2L runs around 3300-3600 rpms when surfing and quite frankly I would like to lower it if I could.

Re-proping is only going to make you use more fuel and put more strain on the engine if you are constantly running that high of RPMs.

I don't see what a XT21 would need anymore power with the 6.2L. Shoot the 6.2L rips things out the whole with my X23 with 3k in ballast. I think you may be over thinking it....
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Old 11-03-2017, 11:32 AM
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You have more than enough motor, I would enjoy your boat as is just as long as it's not struggling to hold speed at that RPM. Or add more weight so that you need to prop down.
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Old 11-03-2017, 01:24 PM
Black'nGreen
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Originally Posted by Mastercraftdave View Post
There is no way that you should need or want to reprop that boat. My X23 with the 6.2L runs around 3300-3600 rpms when surfing and quite frankly I would like to lower it if I could.

Re-proping is only going to make you use more fuel and put more strain on the engine if you are constantly running that high of RPMs.

I don't see what a XT21 would need anymore power with the 6.2L. Shoot the 6.2L rips things out the whole with my X23 with 3k in ballast. I think you may be over thinking it....
Thanks for the reply. If I am understanding your current setup on the X23, you would like to lower your surfing RPMs to where my boat currently runs at, 3100? When consulting my dealer, he stated that this motor likes higher RPMs. I brought this to the forum to get 6000GDI owner opinions on the higher RPMs. Another question I have is what octane fuel is everyone with this new motor running, 87, 89, 91?
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Old 11-03-2017, 01:30 PM
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Originally Posted by Shaun R View Post
You have more than enough motor, I would enjoy your boat as is just as long as it's not struggling to hold speed at that RPM. Or add more weight so that you need to prop down.
^^^^ this. No need to re prop unless it’s struggling. Higher rpms would just waste fuel
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