04-22-2009, 04:01 PM #1
RXTX Nat'l Champs Fast & Reliable Set-up
2008 RXT-X SET Up from David Walker- 2008 APBA OffShore Nat'l Champ, V/M Class- Long Beach 2 Catalina and Back.
( as of 6/19/11- this ski is for sale for $7500- Fresh Super Charger & Service- has 73 recreational-not race- hours)
This is a very Fast and Reliable 3 seater set-up for long distance endurance racing or serious reliable performance for a sportsman rider / racer who wants to use his boat mostly for recreation and pleasure. Generally, unless the other guys boat has so much work it is unreliable, you will be the fastest guy on the water among your buddies, especially in chop. This boat is faster than most stage 1 and stage 2 two-seaters on flat water as well.
This set-up is what I call a "Riva Stage One Plus" for the 2008 RXT-X.
This is my pleasure/practice boat set-up and my big ole' 3 seat RXT-X runs consistently at 72-73mph @ 7940-8000 RPM in the summer heat and humidity of Florida's West Coast- In Dec 08', in lower humidity, at about 80 degress air temp, this boat ran 73.2 @ 8060 RPM consistently with a half tank of fuel.
ALL SPEED NUMBERS WERE ATTAINED WITH A GARMIN GPSMAP76 GPS.
If you do not want to do the work yourself, you should use Brett Willey at Jet Trendz if you are in Florida- 727-844-5361. If you are on the West Coast, I recommend Steve Freibe in California at Clawson Motorsports- 559-435-5020. The reason I name Brett and Steve is that I have worked with both of them and they are Championship Level Racers, Mechanics and Tuners. Also highly recommended by Mark Gerner and other PWCOFFSHORE.com racers in S. California is Arron Cress at Dana Point Jet Ski- 949-661-4947.
You do not want an inexpirienced mechanic to do this type of performance work on your boat. If the mechanic does not have a proven record ( race winners endorsement and/or personal testimony you know to be true) with performance mods on Sea-Doo Super Charged craft, or if it is their first time doing these types of performance mods to Super Charged Sea Doo's, do not use them.
One of the things I STRONGLY ADVISE on the 2008 RXT-X is to reinforce the fiberglass intake tract. This can be done simply after you have removed the stock exhaust, sound suppression system, and intecooler lines which are to be replaced with the after market parts in the list below. ( To install OPAS Block -Off's and the thru-hull exhaust you will also need to temporarily remove the VTS- this is also neccessary to get at the intake tract to reinforce it. )
The reason for this reinforcement is simple- the increased speeds and horsepower of these mods can cause flexing and CRACKING of the intake tract on the RXT-X boat. Even if the intake does not crack and leak, as the intake flexes, it causes a reduction in performance and speed, with a "braking" sensation known as "pump overstuff." You will find detailed instructtions and photgraphs of RXTX Tunnel Reinforcement at these threads :
Once you have removed the intercooler, exhaust, water box, sound supression system and VTS from the boat, reinforce the intake tract by laying fiberglass sheets and fiberglass resin over the whole intake tract and into the junction where it meets the bottom of the hull. Use several layers of glass and resin, and extend the sheeting out a few inches past the 90 degree junction where the bottom of the hull meets the intake tract. Installl the fiberglass and resin in progressive layers, not in one great big thick glob.
For a really trick look, use black carbon fiber fiberglass sheets for reinforcement. I had mine done by Kevin Horn @ American Boatworks in Tarpon Springs FL 727 942 4152. Jet Trendz handed Kevin the boat with all the components removed and he charged a very reasonable $400.00 for a very trick Carbon Fiber Intake Tract Reinforcement. Also in S. California, Jeff Merzee of Merzee's Paint Design & Auto Body reinforced an intake tract for our race boat, and has worked with Glen at R&D on various hull mods and repairs for over 20 years.
Also, any marina or boat repair shop will have a fiber glass specialist or be able to refer you to one. As long as you have moved everything out of the way- and can point out what you want and where, this is an easy job for any auto body shop or boat fiber glass repair shop.
So now that your RXTX hull is reinforced to handle the speed, here is your parts list-
All these parts can be ordered from various sources, such as Greenhulk, Riva, Jet Trendz, Clawson's, Dana Point Jet Ski etc.
Start with the Riva RXT-X Stage 1 kit, which costs $1170.00 at Riva Online:
Riva Top Loader Intake grate
( Note- I actually use the R&D intake grate- hooks better and a little better top speed- I have tested both)
Solas 15/22r Impeller
2 degree pump wedge
3" inch power filter kit
VTS extension rod
Pro series reduction nozzle
OPAS Block kit
Add the "Plus Parts"
Riva X Boat Through Hull exhaust kit.- $260.00
Riva X boat intercooler upgrade / relocate kit- $550.00
Riva BLOW-off-valve- Pro Series $360.00
Riva RXT/RXP Oil Catch Can/ Engine Breather kit- $135.00
Riva X Boat OEM Intake manifold Upgrade Kit - $160.00
You may also want to see if R&D in California makes some of these same parts, for equal or lesser price. Additionally, Steve Friebe has a custom 4" air intake set up that is excellent and sligthly larger than the riva 3".
Have Fun, Go Fast- and we Will see you on the water-
If you have questions about the intake tract reinforcement or any other set-up questions, clease contact me at www.pwcoffshoreforums.com- my username there is offshore1v.
David Walker- offshore1v-
2008 APBA V/M OffShore Nat'l Champ
Last edited by OffShore2; 06-19-2011 at 04:12 PM.
04-22-2009, 07:33 PM #2
04-22-2009, 08:18 PM #3
- Join Date
- Jul 2005
- Lake Dunlap, Texas
Nice job and thanks for the info David. Maybe some of this will help my wife's GTX 185.
04-22-2009, 09:33 PM #4
can you post pictures of the tunnel reinforcement
05-06-2009, 10:45 PM #5
RXTX Tunnel Reinforcement Instructions
Bumping these RXTX Tunnel Reinforcement instructions to the Top
05-07-2009, 08:24 AM #6
Good information and +1 with Brett at Jet Trendz.
BTW - any pics of the reenforcement?
05-07-2009, 06:40 PM #7
05-07-2009, 07:46 PM #8
05-08-2009, 10:00 AM #9
05-10-2009, 09:47 AM #10
Bumping the reinforcement to the top for TSRacing. TS- check my PM I sent you.
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