Thread: GTX 54@ MAX rpm? whats wrong?
01-24-2009, 04:20 PM #1
GTX 54@ MAX rpm? whats wrong?
I just got to go out and test to see if my opas mod worked but it was the same.
But I still cant even get 60mph like these are suposed to get from factory.
What happens is when I take off wot it will hit the gov several times, and at full speed it will keep taping the govener. I have a new wear ring in it.
Im guessing to fix this problem I will just have to repitch the impeller?
bring the rpm down and the speed up?
and idk y the CHK ENG light is on, but it might be from the engine swap, OH yeah I can get the codes right? press mode 5 times.
01-24-2009, 04:33 PM #2
My first guess is that something is wrong w/ your speedo. Your RPMs are at 8000 so your speed should be higher than what the speedo reads. Get a GPS and see what it says. I heard it hit the limiter a bit out of the hole but after that it was fine, not on the limiter at full throttle. Check that code and see what it is!
01-24-2009, 04:54 PM #3
You really seem to be hitting the rev limiter. You need more pitch to get the rpms down to 7550-7600. Are you sure that you aren't using the 155-hp impeller? That's about the speed the NA ski would see... Ron
01-24-2009, 06:09 PM #4
I didnt hit it wot out the hole in the vid, I eased on it till aroung 30mph then i hit it, it would have hit the rev limiter about 5 times before going.
and I took the 155hp impeller out and put my 185hp in after I tryed it, but it was getting 50mph at 8000 rpm, and sucked out the hole.
so I have the correct impeller, new wear ring and my gps is the same as the speedo.
can a impeller lose its pitch just from riding?
01-24-2009, 06:10 PM #5
Oh yeah the err code is P-0118
Engine temp sensor shorted to 12V or open circuit
so I have to find that. probly didnt plug it in.
01-24-2009, 06:48 PM #6
- Join Date
- Aug 2005
- Jerry's guest bedroom
I'm confused. What boat is this? Your talking about the prop from a 155hp ski but your turning 8000 rpm. I thought the only way to get that many rpm on a 4 tec was to run a SC. You also say 60 from the factory, that would mean it's a 215hp boat.
01-24-2009, 08:40 PM #7
- Join Date
- Sep 2006
- winchester va
01-24-2009, 09:08 PM #8
yeah I got a 03 supercharged engine in a 02 gtx 155 hull, I had to change the impeller cause it was going 50mph @8000rpm
But now im at 55mph @ rev limitter
I am going to take the gauges out the 03 supercharged hull and put in this one and see what it dose.
but I HIGHLY dought its the problem.
01-24-2009, 10:09 PM #9
You probably have a sensor unplugged. I hope that will fix your "check engine"
How old is the SC? You signature says you don't have washers in the SC...1) I hope you do, and 2) I hope they are not slipping. Even with slipping washers on the 185, the speed will usually be about 55 at 6500-6700 RPM. About 50 seconds into the video, you are at 55 MPH, or so. This would be inline with a slipping SC. Pull the SC and take pics of the washers/ spring washers, etc.
Something could not be quite right in the pump area too, whether wrong wear ring size, wrong prop, broken/messed-up prop.
01-24-2009, 10:15 PM #10
And No I don't have washers in my SC, and its not the problem cause I'm still way up in rpm, I am going to repitch my impeller to see what that dose.
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