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-   Archive through October 28, 2007 (http://www.wakeworld.com/forum/forumdisplay.php?f=517108)
-   -   Lake Powellers (http://www.wakeworld.com/forum/showthread.php?t=504698)

midlifecrisis 09-26-2007 12:37 PM

For those who have taken their wakeboard boat to Powell, has anyone noticed if it ran or sounded differently. As you can see from my profile, I have a newer boat (2007) and I am wondering if there is something (computer chip, etc.)that adjusts the timing for the higher altitudes. The boat ran fine under full power but when I was yanking people out of the water, it almost sounded like I have an exhaust leak, plus it didn't have the pull I normally have here in AZ. I have yet to run it here in AZ since I got back to see if I have an issue or not. Any input will help and hopefully put me at ease. Thanks, guys.

watsoc 09-26-2007 1:31 PM

I live in Phoenix and my 2000 SAN pretty much ran the same there except that it seemed to have a little less of a hole shot due to the altitude. I roll with 2000 lbs. of ballast and my hole shot at Bartlett is great but it seemed a little more sluggish in Powell. The engine and exhaust sound was exactly the same though so you may have an issue. I would take the boat out here and see if everything appears normal but you have my experience above. Good luck and hopefully everything is ok.

romi 09-26-2007 1:50 PM

I had issues with dock gas esp from Dangling Rope. Next time I go I will bring some octane boaster.

talltigeguy 09-26-2007 3:58 PM

When I run at Mead which is about the same elevation as phoenix, I really don't notice much difference than when I run at Powell - 3,600 ft. <BR> <BR>I would consider some bad gas or get your boat checked out. If it seems fine now...blame it on bad gas.

milehighrider 09-27-2007 8:11 PM

could the "exhaust leak" be from the canyon walls deflecting the sound. i run a good amount of weight also and had no problems but i'm at altitude all the time so hard to tell the difference

hixsonaz 09-27-2007 8:53 PM

my boat seemed sluggish there, so I got back and changed oil and it was back to normal. That was on my old boat that had a carburator though.

baldboarder 10-25-2007 1:55 PM

My boat is an I/O which is different than yours. With the altitude, you might try to change your prop to a lower pitch. My boat runs best with a 21 pitch at sea level, but runs best with a 19 pitch at Lake Powell.

rio_sanger 10-25-2007 2:37 PM

Your engine will lose roughly 3% of your total engine output per every 1000' of elevation. This is due to loss of air density. <BR> <BR>I think Lake Powell is around 3700ft. = 11% of 330 hp would be roughly 36 hp less than at sea level. <BR> <BR> A lower pitch prop definitely will help make up for the loss in power.

shane97210 10-25-2007 3:05 PM

I noticed a loss of some power at Powell, but did not sound any different. I normally operate really close to sea level. What i couldn't figure out was why i had to bump up the RPM's in PP RPM mode for surfing. Might have just been the amount of weight in the boat but i don't think it was any different than i normally run (people+ballast). I really wish there would have been more gas stations, ran out 1/2 mile from dangling rope and luckily got pulled in by a houseboat. NOw i know why people run around with 6-8 gas cans on the swim deck. What a beautiful lake!

rio_sanger 10-25-2007 3:08 PM

Romi- actually your engine needs less octane at altitude, because of the low cylinder pressure caused by the low density air. <BR> <BR>In fact some high altitude towns don't offer over 89 octane for that reason.

deuce 10-25-2007 3:11 PM

No sound difference, but I gain power because of the elevation drop.

midlifecrisis 10-26-2007 3:29 PM

Thanks for the input guys. Come to find out I did have an exhaust leak (since been repaired) and now I know why it didn't have the pull out of the hole (high altitude). Thanks again!!

rallyart 10-26-2007 8:28 PM

Actually Chris, when you're at 3700 ft. you would probably be down 17% on power compared to sea level from dyno tests I've run. <BR>I always feel really good when I get to drive at sea level.<img src="http://www.wakeworld.com/MB/Discus/clipart/happy.gif" border=0>

rio_sanger 10-27-2007 7:41 AM

Interesting Art, that's more like 4.5% loss per thousand ft. <BR>No wonder when I took my old V-6 I/O up to Shaver Lake (5000 ft.) it was such a dog... <img src="http://www.wakeworld.com/MB/Discus/clipart/sad.gif" border=0> <BR>Anytime you want to boat down at sea level, let me know... Maybe New Year's Day?? <img src="http://www.wakeworld.com/MB/Discus/clipart/biggrin.gif" border=0>

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