Thread: Boost variance
06-02-2007, 07:14 AM #1
We are just breaking in my wife's Ultra. It is a great riding ski. It cuts turns great and handles the wakes with ease. I took it really easy for the first 2 hours and followed all the break-in rules. At this point, Ultra250Tn suggested we do some pulls to seat the valves better. We now have 2.5 hours on it. I did 3 pulls from 20-50mph and noticed that the boost was only going to 10. The rpms hit 7,200 instantly and I got off it after about 2-3 seconds. I hoped it would go to 11.3 as advertised, but it didn't. Did anybody else have this same experience?
My friend has a blue 250 and his definitely pulls harder than ours. However, I remember doing this with his ski when the barometer was 30.5 and lake temp was 76F. I thought that roots blowers are not that effected as much by lower barometric conditions as are the Sea Doo SCs. Today, the air temp was 86F, the lake temp was 86F, it rained later in the day and the barometer was 29. These are really bad conditions for jet skis. BTW - My RXT kicked my Ultra's butt yesterday in the pull contest! At this point I am somewhat disappointed in the Ultra.
I want to buy an accurate boost gauge and adaptor for testing. Does anybody know where I get buy a really good one?
06-02-2007, 09:24 AM #2
Actually you have a short window to seat the valves, like the first 20 mins of riding, after that they pretty much as seated as they are going to get, you may try the BOV adjustment adjust to see if you get an extra bar of 2 of boost.
06-02-2007, 11:58 AM #3
The "pulls" you speak of are to seat the piston rings, not the valves. Getting off of it after 2-3 seconds doesn't prove much...probably not enough time for the stock gauge to respond to the true boost put out by the SC or to give a comparison as to the Ultra vs your RXT. give it some time to break in, things should improve.
06-02-2007, 12:10 PM #4
06-02-2007, 12:11 PM #5
06-02-2007, 12:19 PM #6
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06-02-2007, 04:21 PM #7
06-03-2007, 12:31 PM #8
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