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RIVA Performance Forums RIVA Performance Forums General Topics Forum Some STXR mod results|
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Just got back from riding my ski after James Crone of Performance Engineering worked on it for me and all I can say is its FAST, from bottom to top! I am starting to understand why his team dominates the local Superstock class every race.
So far, here's whats on it that would effect performance: R&D Red Heads (42's) Nujet 5.5 prop Performance Engineering Waterbox mod Pump Wedge Extended Nozzle Also on the boat: Renthal bars Scott grips Duckbill drains Cooling upgrade Worx Sponsons No definitive numbers yet, but seat of the pants, the boat is MUCH faster than it was with just the waterbox, wedge, nozzle setup. With the Nujet there is some slight caviation at the holeshot(nowhere near as bad as the used one on my GPR), but when it hooks, the thing hits like crazy and keeps on pulling. It pulls harder than my Stage II/ported GPR, but probably about 2-3 MPH slower on top end than the GPR. I am guessing 2-3 MPH faster than stock with this setup, possibly more; but we won't know for sure until we hit the radar. MUCH funner ride than the GPR anyway. And I am sure the STXR would give the GPR a fit in anything but the smoothest glass, at this point. Didn't realize the R&D head was an O-ring head, I thought it used the stock gaskets. The O-ring just goes around outside the edge of the dome. It didn't give me that warm, fuzzy, reliable feel, but James said it would more than likely be fine. I also bought a R&D ride plate, but it didnt match up, so we couldn't install it. James is going to work it a little and have it ready to test on this setup soon. One point though, the R&D plate is at least twice as heavy as the stock plate. I found that odd. I put the Worx sponsons in the same position as the stock ones come in, which is all the way up and forward. When holding them up to each other on the boat, they look about the same in that position. Although the Worx are MUCH better quality than the stock ones, obviously. I did notice that even in the same position, the boat stayed truer at speed in the chop. The stocks sponsons seems to let the nose "root" around a bit at high speeds in the chop. Sometimes letting the boat turn slightly, unexpectedly after hitting some big chop. Not like an Ultra, mind you, but kinda like that. The Worx in the up/forward position elimiated that as I could tell. They also tightened up the cornering slightly in this position as well. When James first installed them, he had them down/middle and he was doing WOT/90 degree turns with ease on the boat. Never ceases to impress me when he does that  The Renthal bars are nice. They are a couple of inches higher and wider than the stock bars. Much more comfortable for taller riders. Plus, it gives me a spot to put my GPS and Tiny tach as well. I am not used to the Tri-pisser/Cooling upgrade thing, but I like the idea of being able to identify water coming from my head and be able to feel how hot it is if I need to. I will post more as I get more info on the performance of the boat. -Jarrett |
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Forgot to mention, I am very happy with this ski in its current state. It's nice to have a ski perform above your expectations.
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Hi Jarrett,
I'm curious about the pump wedge - does it make the ski unhook more in the chop compared to flat water? O-ringed domes are fine...my SD has them and I never had a problem with them... A bunch of friends here have STX-Rs too and I've rode them already. They put new sponsons on them from Sato Engineering (SE) - they like them but I found their skis are much harder to turn than my GPR equipped with Beach Houses - you really have to muscle the bars around - it turns tight if you can do it. I put the stock ride plate back on my GPR along with an XLT 3 deg exit nozzle for testing...the result is about a 2-3mph loss in top speed with a full tank but the hook up is like riding the STX-R. I raced my buds today and from a 20mph start, I walked away from him and stayed out in front even when we hit chop. I know that if I put the Riva ride plate back on and the 5 deg nozzle, I'd be a lot faste but as soon as we hit chop, he'd probably catch up... I GPS'd his today at 60.2 for a best top speed... In a few days, I'm going to be able to test both types side by side like you every day...My STX-R arrives at 11am on Tuesday from Okinawa...  |
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Ray, when do you think the new GPR will arrive?
It will be intersting to see how the Skat equipped GPR does against the STX-R. (of course the extra 100 HP makes the comparison a little unfair) |
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A little unfair? Ha, that's the understatement of the year. Frankly making that comparison is pretty useless. Funny thing is the STXr will probablt be very close to the GPR even in stock form.
Well Mr. Hinds I guess contrary to some opinion, you CAN be satisfied.  |
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Have ya'll seen the R&D ride plate intake grate combo on the R&D site for the STX-R. Give the STX-R a better paint job and it would be the sh!#
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Have you seen the RED one Rich?
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What red one? All I have seen is the white with checkered flag on front and that puke green.
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Follow the Kaw link for a few more pics, too.
http://www.rivayamaha.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=4&t=000483 |
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NOT available in America Rich
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Ray,
That speed for the STX-R sounds low. Yesterday we did multiple runs with all kinds of GPR's, Ultra 150's, and one stock STX-R. We were riding in perfectly flat salt water for a 1/4 - 1/2 mile stretch and were getting consistly 62.3-62.5 for the STX-R. There was a stock GPR there that raced the STX-R several times and would pull on the GPR out of the hole by about two to three boat length and then the GPR would start the catch up in the midrange and by the end of the run the two skis were neck and neck. The STX-R was pulling on me out of the hole by about 1 boatlength and then I easily caught up to him in the midrange and flew past him and was about 10 boats ahead or more at the end of the run. My best run yesterday was 68.3 at 7200 rpms. When watching the two skis approach us from a distance the STX-R definitely rides a little smooother on the water does not bounce like the GPR does occasionally. I think it is defintely a sweet ski to be a 3-seater and go 62 stock. The Ultra we tested had ride plate and impellor and went 64.8 and the two tripple piped ski's that were there went 71.7 and 76.4. The slower tripple piped ski had a bad impellor. quote: [ 06-24-2002: Message edited by: '01gprman ] |
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Oh my god, that red STX-R is sweet. Why wouldn't the red color scheme be available here in the U.S.
It is much more sexier than the white and checkered color scheme. Please keep this a secret, my XLL is starting to suspect. |
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Jarrett wrote: "Didn't realize the R&D head was an O-ring head, I thought it used the stock gaskets. The O-ring just goes around outside the edge of the dome. It didn't give me that warm, fuzzy, reliable feel, but James said it would more than likely be fine".
Actually I prefer the o-ring type head sealing. The o-ring goes around the combustion chamber only. What I didn't like was the R&D heads require Ultra blue silicone around the outside of the head to keep water from leaking out. Like I said it should be ok, but not exactly what I would recommend. I like a fully o-ringed head better... James Crone Performance Engineering 940-321-5865 940-206-3314 (cell) |
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That's where the ADA head shines
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GPRman...I know its "slow" compared to what everyone else is saying but all of them here are testing out the same. My GPR only goes 66.4 here even though I'm turning 7300+ rpms while everyone else is claiming over/near 70 with the same prop/rpm combo. I don't know what to make of it cause when I was in Okninawa on salt water, we radar'd 66 at only 7180rpms...
Speeds here were taken with a Garmin Etrex on a fresh water lake at sea level with very low humidity and temps in the 60s... For some reason I just can't get the top speed numbers folks in the states are getting so I pretty much now just use my PET tach to keep tabs on how healthy my motor is, use the GPS for quick reference now and then, and as long as I'm the guy out in front - am not gonna worry about the speed numbers anymore... |
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Ray, do you have access to a radar gun? Is it possible that GPS there reads some sort of 'error" signal?
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I am thinking something is up with the GPS's myself because your radar reading (66 @ 7180) sounds right on the money because two weekends ago I was on the lake (before carb tuning) turning 7160-7170 @ 66.3 on a ProStalker Radar Gun.
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Maybe its the difference in water?
I should have a radar gun up here in about 2 weeks complete with STALKER ATS...then I'll get some top speed and accelleration testing done on the STX-Rs, my 01 GPR, and Dustins too as it should be here by Friday... We're above the 40th parallel but I would think the GPS would still work fine up here but I guess we'll know for sure when my bud brings his radar system up from Okinawa 2 weekends from now... |
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Ray I bet after one ride on Dustins old boat you will wonder why you ever bought the stx-r..
Good luck with everything Ray |
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Even tuned, the STXR can be a daily ride, a SS GPR can't.
11 |
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