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Old 05-15-2012, 09:26 AM   #1 (permalink)
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Default GTX iS 215 TOP SPEED

I own sea doo gtx is 215 ,the top speed is 61-65 mph, 7700-7900 rpm, i need more power with daly use , how to modify my jet ski ?
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Old 05-15-2012, 12:57 PM   #2 (permalink)
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I own sea doo gtx is 215 ,the top speed is 61-65 mph, 7700-7900 rpm, i need more power with daly use , how to modify my jet ski ?
What year is it? If it is the same as mine on near 2008, you can use RIVA parts or complete kits. Go to " GREEN HULK'S" Website. You will find a tab for Seadoo RIVA performance parts. I bought the RIVA STAGE III kit for my 2006 RXT over two years ago. That with some other key changes like an "X" charger took me from 215 HP to 300 HP, and from 7900 rpms to 8500 rpms. my acceleration was the most noticable change it just rips away from all but two skis I have raced, stock skis even this years don't have a prayer against it. Top speed was increased from 69 mph to 76-77 mph. I run my ski like a stocker or wide open. It doesn't matter it is very dependable. I really like it when a guy who listens to Showroom hype from the dealer comes out to race with the expectation that his ski is the baddest thing on the water only to get blown away by a 6 year old Seadoo with seemingly less horse power. The expressions are priceless.

Good Luck

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2006 RXT with RIVA STAGE THREE KIT 295 HP

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Old 05-15-2012, 09:11 PM   #3 (permalink)
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Thanx , I check riva and I didn't find any kit for my 2010 sea doo "gtx iS 215" even if ther is some parts support to the Rotax engines I have one problem my jet ski too heavy ! How I manage these things instead with rxt and rxp kits, bay the way the jet ski weight 960 pounds .
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Old 05-16-2012, 06:53 AM   #4 (permalink)
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Thanx , I check riva and I didn't find any kit for my 2010 sea doo "gtx iS 215" even if ther is some parts support to the Rotax engines I have one problem my jet ski too heavy ! How I manage these things instead with rxt and rxp kits, bay the way the jet ski weight 960 pounds .
I was afraid of the fact your ski was a newer S3 hull. There are not many after market performance parts for those type yet. Having said that you could look into the possibility of upgrading your supercharger to the ones used on the "X" models that crank out 260 hp. That is the supercharger I use on my 2006 RXT which helped alot. Basically our motors are the same being 1500 cc 3 cylinders. So you should be able to upgrade to the "X" charger from the RXT-X/RXP-X, bigger injectors, cold air intake, RIVA speed limiter override and a different prop would be good for you. You have the fast S3 hull which should help with weight disadvantage.

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2006 RXT with RIVA STAGE THREE KIT 295 HP

2009 RXT-IS 255 HP

2008 GTX 215 HP



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Old 05-16-2012, 07:46 PM   #5 (permalink)
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Thanx again, you are right ,this what iam think to do ,but what about to Chang the supercharge fan only to get more "psi" + riva ECU +cold air intake +prop (I don't know which size) + valve train Upgrade.
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Old 05-17-2012, 07:50 AM   #6 (permalink)
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Thanx again, you are right ,this what iam think to do ,but what about to Chang the supercharge fan only to get more "psi" + riva ECU +cold air intake +prop (I don't know which size) + valve train Upgrade.
You are on the right track, but you should upgrade the fuel injectors as well to Bosch 50 lb to meet the needs of the "X" charger. The last thing you want is a lean condition resulting in a burn down. Most supercharger mods fail due to not enough fuel pressure resulting in a burn down. My whole valve train, ECU, prop, cold air and thru hull exhaust and water box are upgraded by way of the RIVA STAGE III kit. But it will no longer be a sleeper with the thru hull exhaust. Guys tend to steer clear of racing me when they hear the pipe. But it works well and sounds nasty. The RIVA racing ECU allows the motor to spin @ 8500 rpms, creating a whole different power band. You may want to look at the parts in it to see what you might be able to use. The acceleration difference impressed me the most. The top end of 76-77 mph was a bonus.

As I stated earlier, my ski is properly set up for the mods it has, and as result will run all day long at stock speeds and up. It is just as reliable as a stocker so far with approx 100 hrs on the kit.

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2006 RXT with RIVA STAGE THREE KIT 295 HP

2009 RXT-IS 255 HP

2008 GTX 215 HP



Land Rocket - 2003 Z06 Corvette, Chevy

Last edited by Outlaw; 05-17-2012 at 06:45 PM.
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Old 05-17-2012, 10:11 AM   #7 (permalink)
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I appreciate your hard work with adequate explanation, I hope
Soon*When finished installing parts i will give feedback*how much is good ,top speed and acceleration .
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Old 05-17-2012, 06:54 PM   #8 (permalink)
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I appreciate your hard work with adequate explanation, I hope
Soon*When finished installing parts i will give feedback*how much is good ,top speed and acceleration .
On a good day top speed is 76-77mph on gps, acceleration is hard to define. It is night and day different from a stocker. I absolutely destroy stock skis including the new ones, but I have yet to run the 300 Kawasaki, I tried to get a guy to run me but he was with his buddies and I think was intimidated by watching my ski run in a race before while he watched. I raced a 2009 RXP-X and pulled him by at least 10 ski lengths. He just shook his head because he thought all I had done to it was a pipe and cold air. A 2006 RXT should not blow away a 2009 RXP-X

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2006 RXT with RIVA STAGE THREE KIT 295 HP

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2008 GTX 215 HP



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Old 05-18-2012, 10:22 AM   #9 (permalink)
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What is the deferent between 2009 gtx iS 255 and 2011 gtx iS 260 ,
in modification parts !

Last edited by Sam10; 05-20-2012 at 06:01 PM.
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Old 05-20-2012, 06:09 PM   #10 (permalink)
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Does Anyone upgrade his SeaDoo jet ski with " iS " model ? And what is the feedback !

Last edited by Sam10; 05-23-2012 at 09:20 AM.
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