Thread: RIVA BOV VS. TURBO SMART
03-27-2006, 12:54 AM #1
- Join Date
- Mar 2006
RIVA BOV VS. TURBO SMART
NEED FACTS AND OPINION ON THIS MATTER. THANX
03-27-2006, 01:13 AM #2
how about no BOV at all?
you will find soooo many threads about BOV's.... but one thing that has stayed constant is that Mark Underwood, Les Cooke, and Franko Detorri of Rotax Racing all do NOT advocate the use of a BOV.... nice to see 3 well respected individuals having similar views.
03-27-2006, 05:53 AM #3
- Join Date
- Jan 2006
- Puerto Rico
PWC guy, don't take to seriously all the info that you see in the internet, according to my neighbour who is a "forced induction specialist" the BOV mod is a MUST in any type SC or turbocharged engine set-up, last year he give a very detailed explanation about all the benefits of the BOV in Riva's Sea-Doo web site, do a search there and type the word "TURBO TECH", you should find all this very interesting info there. My turbo smart BOV will stay for EVER in my moded stage II and soon to be stage III moded RXT.
03-27-2006, 08:29 AM #4
You know...the more and more I think about it and digest what Nils said sometime back the more and more I understand why no BOV...
Absolutely the BOV is good for the life of the supercharger but let's be realistic...how many people on here have complained about the supercharger taking a crap? It's the clutch that's the weak link and i can see where the BOV could potentially be detrimental to the clutch's life...
I really think Sea Doo doesn't do much but slightly beef up the clutch because it's designed to be the break point. In their eyes it's a consumable part because naturally it's cheaper to replace than a whole supercharger assembly or the gearing used to run the supercharger. I think the fact that in real world conditions it turned out ot be more fragile than it was in their controlled testing is the only reason they even beefed it up for 06...
Now when I go stage II I will hook up the BOV and use it until (if/when) it fries a clutch on me way too early. Then I'll think about blocking it off... I just don't think my riding conditions / style it's going to make much difference either way...
03-27-2006, 10:36 AM #5
Chris is right ... BOVs are good for boosted vehicles usually ... BUT! Our skis are the only supercharged machines that I know of that employ a clutch! Like Chris said, the BOV is good for supercharged motors, but our first concern is not the supercharger ... it is clutch life! Forget everything you know about boost and superchargers and BOVs ... on our machines, THE issue is clutch life.
All the experts on SC 4-tecs AGREE that the clutch lasts longer WITHOUT a BOV. And BRP did not put one on from the factory either ...
The clutch engages when the engine suddenly slows down FASTER than the SC impeller ... and the sudden elimination of boost 'on the other side' when the BOV releases only makes the difference in speed between the motor and the SC impeller greater ... making the clutch work harder and more often. The boost 'stacked up' behind the SC helps to slow down the SC impeller, and the BOV releasing this pressure just makes the SC freewheel much quicker, wearing on the clutch.
BOVs on OUR machines have NOTHING to do with BOVs on ANYTHING ELSE ... while BOVs are great on everything else supercharged, they are NOT good on our machines due to the single fact that our superchargers have a clutch. Understanding that, and how our clutch works, should make it easier to understand why all the 4-tec experts agree on this ... the BOV makes the clutch wear out quicker.
03-27-2006, 11:16 AM #6
I am far from an expert on SC's or BOV's, but logic tells me Sirhc and Vern are absolutely correct (as well as Mark U, Nils, Jerry). In fact, I had this discussion nearly a year ago, although I could not articulate it as clearly as Vern does:
03-27-2006, 11:31 AM #7
So I just installed Riva blow off could I simply unplug the vacuum line and plug it? rather than remove the cool looking blue hose with chrome air filter I just spent $200 on?????????
03-27-2006, 01:15 PM #8
Yeah, without the vacuum line the BOV will stay closed...
And you know it's funny because I realize I have done a complete 180 on this subject. I still think the BOV is a great idea for the supercharger but since the supercharger seems to be more than up for the abuse than the task falls on the clutch which certainly isn't...
03-27-2006, 07:39 PM #9
- Join Date
- Apr 2005
- Augusta GA
Tis is my take on it. I had very bad results from it. With the BOV on my rxp I burned up two, yes two Clutches (RR that is) and a good Vortex SC impeller. well over $500 bucks down the drain and a good SC impeller. All within about 6 hours of riding time. I had to get a new 05 SC. When the last scutch went out the Vortex sc blades grinded to a hault and bent the shaft. Got the new SC housing on and got ride of the BOV. The BOV will not go back on my ski.
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