gmtech16450yz
Jetboaters Lieutenant
- Messages
- 265
- Reaction score
- 518
- Points
- 157
- Location
- SF Bay Area
- Boat Make
- Yamaha
- Year
- 2017
- Boat Model
- Limited S
- Boat Length
- 21
Ok I had a chance to take the boat out in the San Francisco Bay today. Amazingly nice ~72 degree air temps, water as smooth as glass day. The latest round of mods all worked awesome! and, I CAUGHT A SHARK!!!
Haha. I've been trying to catch one the last 2 times out in the Bay, finally got one today! OMG what a beautiful animal. It was like 5 feet long, not sure how much it weighed but it was pretty heavy! It's a Leopard Shark, pretty common in the Bay. We'd been fishing for a few hours already but when I finally hooked it and saw it in the water I didn't know what to do! I used a nice LONG pair of pliers to get the hook out, we took a couple pics and each of us had a chance to touch it before we let it go. So cool!
For those that were following my latest mods, the exhaust was WAAAAYYYY quieter, the engine noise was WAAAAAYYYY quieter, and my gauges worked perfectly. I was afraid adding in the Moroso Spiral Core mufflers might hurt power, but as usual, top speed didn't change a bit. Holding a normal volume conversation at anything below 7k rpm is not a problem, between 7 and 8k/52mph you have to speak up a little bit but it's still not bad.
The gauges worked awesome, as I thought, the lower ranged temp gauges are perfect. Highest temps I saw were under 150, "normal" seemed to be around 135-140 degrees. That's with 61 degree water temps. Interesting thing was that the port engine ran 5-10 degrees hotter most of the day. It's possible that the gauges aren't that accurate and the engines themselves actually aren't that far apart temp wise. The same was actually true for the water pressure gauges also, the port engine showed higher pressures than the starboard side. The explanation for that could actually be the fact that I opened up the nozzle on the starboard jet to equalize the engine rpms. A little less nozzle restriction could certainly explain the lower pressure readings. The cool thing is that 0-30 psi gauges are PERFECTLY matched to what our engines run at. Once you're over 3000 rpms or so the pressure starts reading. At 6800rpm the pressure reads about 20 psi, at 7800 the port side was reading about 28 psi and the starboard side was at 26 psi. So my idea of easily being able to make sure your pump pickup or coolant screen isn't plugged by simply glancing at the pressure gauges will work perfectly. Yay!
The blower mod also worked awesome, you can barely hear it when the engine is idling and the fans are on the low speed. On high speed you can't hear it once you get engine speed over 3k rpm or so. The other thing I did was to cover the aluminum pieces I made for the dash, throttle controls and storage compartment with white marine poly. I usually like polished aluminum, but it just didn't look right in a boat. The white looks much better imho.
It's so nice to have a boat setup the way you like it and the way it all just works the way you need it to. I put a bunch of hours into doing this stuff, but I'm thrilled with the results. The boat is quiet, fast, has the information and controls I need on the dash and looks good. The rod holders are amazing too! I really do like this boat, we should get many years worth of enjoyment out of it.
Haha. I've been trying to catch one the last 2 times out in the Bay, finally got one today! OMG what a beautiful animal. It was like 5 feet long, not sure how much it weighed but it was pretty heavy! It's a Leopard Shark, pretty common in the Bay. We'd been fishing for a few hours already but when I finally hooked it and saw it in the water I didn't know what to do! I used a nice LONG pair of pliers to get the hook out, we took a couple pics and each of us had a chance to touch it before we let it go. So cool!
For those that were following my latest mods, the exhaust was WAAAAYYYY quieter, the engine noise was WAAAAAYYYY quieter, and my gauges worked perfectly. I was afraid adding in the Moroso Spiral Core mufflers might hurt power, but as usual, top speed didn't change a bit. Holding a normal volume conversation at anything below 7k rpm is not a problem, between 7 and 8k/52mph you have to speak up a little bit but it's still not bad.
The gauges worked awesome, as I thought, the lower ranged temp gauges are perfect. Highest temps I saw were under 150, "normal" seemed to be around 135-140 degrees. That's with 61 degree water temps. Interesting thing was that the port engine ran 5-10 degrees hotter most of the day. It's possible that the gauges aren't that accurate and the engines themselves actually aren't that far apart temp wise. The same was actually true for the water pressure gauges also, the port engine showed higher pressures than the starboard side. The explanation for that could actually be the fact that I opened up the nozzle on the starboard jet to equalize the engine rpms. A little less nozzle restriction could certainly explain the lower pressure readings. The cool thing is that 0-30 psi gauges are PERFECTLY matched to what our engines run at. Once you're over 3000 rpms or so the pressure starts reading. At 6800rpm the pressure reads about 20 psi, at 7800 the port side was reading about 28 psi and the starboard side was at 26 psi. So my idea of easily being able to make sure your pump pickup or coolant screen isn't plugged by simply glancing at the pressure gauges will work perfectly. Yay!
The blower mod also worked awesome, you can barely hear it when the engine is idling and the fans are on the low speed. On high speed you can't hear it once you get engine speed over 3k rpm or so. The other thing I did was to cover the aluminum pieces I made for the dash, throttle controls and storage compartment with white marine poly. I usually like polished aluminum, but it just didn't look right in a boat. The white looks much better imho.
It's so nice to have a boat setup the way you like it and the way it all just works the way you need it to. I put a bunch of hours into doing this stuff, but I'm thrilled with the results. The boat is quiet, fast, has the information and controls I need on the dash and looks good. The rod holders are amazing too! I really do like this boat, we should get many years worth of enjoyment out of it.
