What cause slow speed?

[The noob guy]

I upgraded the motor to turnigy 3674 2200kv and seaking 180a but now my sr80 full speed is like 1/3 of full speed when I run on stock motor and esc. The engine rev sound is amazing and powerfull though. What could be a problem? Drive shaft?

[mappo]

What size propeller are you using, might be cavitation.

[The noob guy]

Everything is stock except motor, esc and fin.

[mappo]

Everything is stock except motor, esc and fin.

How many cells?

[The noob guy]

5s. I run 4s or 5s on stock and its much faster. 6s on stock and the boat is flying. New motor and esc and the speed is like 10-20 mph.

[eehess81]

Switch motor wires, might be in reverse throttle

[mappo]

How many cells?

based on my little knowledge of this boat. all I can tell you is to move to an X445 prop with your 4 cell batteries

[mappo]

5s. I run 4s or 5s on stock and its much faster. 6s on stock and the boat is flying. New motor and esc and the speed is like 10-20 mph.

on 4s you gonna get about 50 mph with a x445 prop. on 5s with a 440 prop 52 mph with some cavitation, try experimenting with a 3 bladed 440 prop. on 6s 55 mph with a 437 prop and some cavitation and a bit of heat. Those are my calculations ideally 4S would be a safer setup.

[mappo]

Everything is stock except motor, esc and fin.

BTW what’s the stock Prop? Just curious.

[jkflow]

Did you do a throttle range adjust per manual for your ESC?
Might also have to reverse throttle to get 100%, pending your transmitter. It's in the Seaking 180 manual.

[The noob guy]

Im not sure about the throttle calibration. I have a dumbro x6. All I did is turn on the controller while holding down the trigger then plug in the battery and release the trigger when I hear 2 beep. The motor rev is amazing so not sure its not 100%.

[jkflow]

No, that's not it, read the ESC Manual, it's easy to do.

https://www.hobbywingdirect.com/collections/seaking-v3-manual

[The noob guy]

I think i did it right. What part is not right?

[Racingjake]

I have a Arrma Limitless car that ran faster in reverse than forward. I had the motor wires crossed and thought by changing the switch on the transmitter it would fix it, nope. I reset the ESC to the right directions and hooked up the motor wire correctly and radio set right and BAM she's running 100 mph now.

I'd start with motor direction first and only go with forward in the ESC first, but once you get the transmitter, ESC and motor correctly program and wired you'll be back in business.

I just got back from the lake today with my SR80 with OSE 150, 3674 2200kv leopard motor, 187 flex shaft with stock prop (?) runs very fast on 5S

[jkflow]

I believe DumboRC is 'Futaba like' and you have to set throttle to reverse.
1. Next, you perform the throttle range adjust
2. Cycle ESC power and if the motor runs in the wrong direction, switch 2 motor wires
Done

If that doesn't solve it try again in the forward position and keep the sequence. Don't ever use the transmitter throttle reverse for anything else.