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2004 GTX LTD SC RPM drops after planing - dealer is stumped and so am I!

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jid

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I've owned my 04 GTX Supercharged LTD for 8 years. 140 hrs on it. The short version: It wasn't making power and wasn't going past 38 mph after sitting for the winter. So I had the dealership do annual service (plugs, oil, etc...), change the wear ring (which it needed), and rebuild the supercharger. After putting it all back together, Ski will max RPM at launch but as soon as the ski planes, the RPM drops to 6900rpm and hold there. It WILL hit the rev limiter at launch but then it drops.

Dealership can't figure it out and neither can I. Anyone ever seen something like this happen? I'm truly close to ripping my hair out. Anyone ever seen this happen or something close?

Thanks!

JD
 
It gets worse.... the oil level was slightly higher than it should have been. removing oil and getting the oil level to half way on the dipstick reclaimed 300 rpm. So not it is topping out at 7200. Still isnt' pulling to redline but it is an improvement. What else could it be?
 
Ahh. Use the search at the upper right on "oil overfill and supercharger".
There has been lots of discussion on too high oil level for a supercharged SeaDoo. Apparently, the supercharger sucks oil into the intake system fowling the plugs and mucking up the mixture.
They suggest that you pull the hose between the supercharger and throttle body. Drain it and clean it out. Pull the plugs and clean them too. They say the oil level should be 3/4 the way up on the dipstick.
 
AircraftDoc said:
Ahh. Use the search at the upper right on "oil overfill and supercharger".
There has been lots of discussion on too high oil level for a supercharged SeaDoo. Apparently, the supercharger sucks oil into the intake system fowling the plugs and mucking up the mixture.
They suggest that you pull the hose between the supercharger and throttle body. Drain it and clean it out. Pull the plugs and clean them too. They say the oil level should be 3/4 the way up on the dipstick.
Click to expand...

Being no stranger to search, I did do all the 'stuff' that was suggested. I'm still down several hundred RPM. Changing the plugs (which I had done recently and did again this morning) yielded the same result. I'm still at 7100ish RPM. Losing a few hundred which is keeping my speed down.

any other thoughts/opinions on this one?
 
Make sure you clean out the rest of the oil that will sit in the hose that comes from the SC to the throttle body. When you up the rpms, the more the air will pick the residue oil that is still around.
 
Well, I cleaned it out completely and no change. I also replaced the jet pump. No change. Had the impeller checked and repaired (it wasn't bad but I wanted to be sure). No change.

Any other ideas?
 
Look for an exhaust leak. That's what cause my low RPM problem. I had to replace the J-pipe.
 
Fuel pump change is pretty simple but I doubt that is your issue. They seem to work or not work and are very reliable. What is your speed at 7200 rpms? Many of the 185 GTXs don't peg the rev limiter especially in warmer weather and fall short a few hundred rpm but still get close to 60mph on the gauge or around 57 gps. They just don't develop the boost that the 215 develops.

Your j-pipe has 3 water holes and these can become clogged which will rob some performance and generate heat. Have you ever gotten a H-TEMP warning?

You could check compression and do a leak down test. This will give you the health of your motor.
 
Leak down and compression check were fine. The speed at 6700ish RPM is 48-50. This GTX _used_ to peg the rev limiter. And it will peg it out of water I GPS-check the speed and I'm definitely down on it. I'd be happy w/ 57 if I could get it!

Never gotten an H-Temp warning. But i'll take a look at the J-pipe. I'm assuming I remove the connection to the water holes and then clean them out? Is it easier to remove the J-pipe or can I just do it right there?

Thanks for the tips!!!
 
Forgot to mention that the RPM is back down to 6700 and won't go above it now. :cuss: :cuss: :cuss: :cuss: :cuss: :cuss: :cuss:
 
Have you checked the slip of your sc? Wouldn't be the first time I've seen a rebuilt one not done correctly.
 
I was actually coming back here to suggest the slip on the SC as I was just reading a couple articles about the slip causing low RPMs. I don't understand how that causes lower RPMs though. Logically I would think the exact opposite. Any hope...can you check the clutch washer slip without removing the SC? Remove the input hose and put a torque wrench on the impeller cap nut? 9-14 Nm is the proper range on 2007...not sure if its the same on 04.

Nate
 
yes, can be checked in the ski but you'll have to stick a broomstick in the pump to keep the motor from turning.
 
I don't understand how that causes lower RPMs though. Logically I would think the exact opposite.
Click to expand...

The impeller blocks air flow when it isn't being driven to pressurize the air into the motor.
 
remove sc inlet hose, stick broomstick in impeller, use torque wrench to turn nut left hand direction(left handed nut), repeat and report back with torque when it slips.
 
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