GT-40 bogs/lacks top end speed |
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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The weather is not favorable for a ski today but I will run her first chance I get. I will pay attention to my RPM plus carry my GPS to see exactly where I stand.
This whole boat deal has been crazy. I'm 41 and I'm like a kid in a candy store when it comes to going for a ride/ski. For you guys with more ownership time under your belt, does that ever change? |
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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No.
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'63 American Skier - '98 Sport Nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Nope, I always get excited too. I've recently converted some friends and relatives to slalom/wakeboard nuts and that keeps the fun going too.
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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I didn't suspect it would. So its actually better than candy, cause after you lick the red off its not as good. Ha
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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gun-driver
Grand Poobah Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4127 |
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The HP pump was the first of the two original problems I felt it could be. As for RPM's you should be able to get 5,200 and around 47-48 mph with the right prop. I have the 1442 on mine. |
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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Walter,
Seems my problem was my high pressure fuel pump. I say that carefully because I haven't been out for a good 2 hour ski yet. The initial ride was smooth but I wont know for sure till maybe Thursday when I go looking for slick water. What exactly is your boat doing? |
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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Fly100
Senior Member Joined: September-30-2009 Location: UK Status: Offline Points: 126 |
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Did a test on mine tonight SN 1996 196 351W. 39 mph @ 4100 rpm it has the Protec conversion dizzy and coil on it.I run LPG and the LPG carb is a very very basic unit.Also I think LPG gives 10% less power (its 60% the cost of petrol here)
With all the above in mind I think im not far off the mark. Comments ?? FLY |
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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Hey Guys,
It has been a while since I have updated the thread. Since replacing my HPFP the boat has ran so much better! I wish I could say there have been 0 surging issues but I can't. It has been very minimal though.... only a couple of times. I have been skiing trying to make up for lost time,so all is well. Fly100, this is what I'm getting out my 1995 SN with the GT40 EFI: 45 mph @ 4800 rpm. Im running a broke mans 3 blade prop LOL. I'm all smiles because we able to play in slick water. |
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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Fly100
Senior Member Joined: September-30-2009 Location: UK Status: Offline Points: 126 |
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Scooter T my 4100rpm is WOT and wont rev anymore.thats full tilt including the mirror folded in! :-) |
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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Hey CCF,
I am still dealing with the same surging issue that I've had for the past 3 summers with no resolve. Thought I would seek your advice again. Fuel pressure @ idle: ~37psi Fuel pressure w/regulator disconnected @ idle: ~41psi Fuel pressure @ WOT: ~39psi Fuel Pressure w/regulator disconnected @ WOT: ~41psi Motor would surge when under a load (typically between 35-40mph) Fuel pressure remained consistent during surges Motor continued to surge irregardless of whether or not the regulator was connected Schrader valve on the fuel line gave us some issues. It was loose so we tightened it. However, once it was tightened the valve stayed partially open and leaked fuel. We loosened it and this stopped the leak. Checked resistance in the TPS w/multi-meter. Needle made a clean sweep from idle to WOT. Note that one of the plug wires arced on my hand. Wires are supposedly only a couple of years old according to PO. They are marine grade 8mm wires. Not sure where to go from here. When we're at a cruising speed between 35 and 40 (it does surge at slower speeds but it's more noticeable here) the boat feels like it has lost most of its power for maybe half a second and then regains power. It is a very sharp, noticeable contrast. The motor doesn't sputter or sound like it's missing, it just sounds like the key has been switched off and the motor naturally reduces rpms but then instantly regains all power. Sounds like it would either be fuel or ignition related. Is it possible to have fuel problems but still maintain high pressures during the surging? Any suggestions would be appreciated. |
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Very possible that a wire or wires is bad right out of the box. I'd check the Distributor cap too. Need to cross the simple things off the list. Basic tuneup items can cause problems. |
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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The Distributor Cap looked ok. If I were to replace the wires, do they have to be marine grade or can I pick some up at the local part store? One thing we noticed is how the wires are bundled together and touching the block. There just wasn't a lot of slack there and I could see where if the wires were bad they might ground out on the motor. Is that normal for the wires to be tightly bundled and laying againt the block?
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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I would go with the wires specified for your motor to be on the safe side. I think it's more the length (to get around the marine exhaust manifolds) that makes them marine more than anything.
http://www.skidim.com/prodinfo.asp?number=RK120015 These are a nice to have to help organize your wires and keep them from hitting stuff: http://www.summitracing.com/parts/maa-9-28150/overview/ I wouldn't say that hitting the block is automatically a problem... but if the wire insulation were to chafe against something moving like a pulley or melt on something hot... well like the block, then yeah, it could be a problem. Although, I think some contact is normal and un-avoidable. |
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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Thank you for the advice. Wires have been ordered and I will let you know if that is the fix.
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Hi Shawn, Did you get a chance to try the new spark plug wires?
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scooter t
Groupie Joined: September-19-2010 Location: Moncks Corner Status: Offline Points: 49 |
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Hey Brian - I did replace the plug wires back on 7-19, and have been out 5 times since then and the boat has run perfect. I had to go at least 3 times before I felt for sure it was fixed. I appreciate your help.
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I Love to ski, but what I Love more is watching my children learn to Love it too.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Nice!
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