Well, the B2 is the exact same boost at 7700/11.3 and 8450/14 as the ET Low Boost wheel so I imagine that means it has the same requirements. I would much rather leave the fuel system alone if I can, I wonder If I shouldn't just do a C-3 then 7700/10# 8300/13#.
When you say the maptuner needs a FPR, that's to raise rail pressure to compensate for the new boost level right? I just figured the stock FPR scaled progressively to maintain 39-43 psi differential between fuel rail and the manifold, and a increase in boost of 4/7 psi wouldn't be a big deal....if it doesn't then it definitely will need a new FPR that is capable, unless the injector pulse can widen enough to compensate. I doubt the fuel pump will be out of flow at that point. Any idea what the injector duty cycle is stock at WOT? I would want to keep it to less than 85%.
Does the powershot allow raising the RPM limit? I hadn't seen that feature listed on the R&D website, but if I could raise the RPM limit and maintain at least a 12.0 or better yet 11.8 AFR, I would be completely satisfied with being able to run over 50mph regardless of my weight load. The CJS viper venom I added has pretty dramatically affected my boats attitude, costing me a few mph at full throttle. The boat drives and rides like a dream now, but I'd really like to get the lost mph that back plus a couple more.
The B2 is the ET Low Boost anodized black. It is the same wheel. I think the C3 is for sure ok, and the B2/ETLB is borderlined with stock fuel. Mine is good to 8300-8400 rpms.
The downside to the C3 is that it is heavier, and they say it's harder on the charger clutch.
The Maptuner X tunes are specifically set up for Riva Kits. You would run the Stage 2 tune. This is a link to what is included in the Stage 2 kit.
http://rivaracing.com/i-18127020-fzrstage-2-kit.html I don't see a fuel psi regulator on the list, probably because they list it at 8300 rpms. I know they can modify these tunes for you, as Swatski tried several custom tunes.
Here's a good read on injector duty cycle. The SHO has been around since 2008, so the ski guys have them pretty much figured out.
http://www.greenhulk.net/forums/showthread.php?t=157854 Post #64 answers your question. Basically the injectors are the weak point that sets the 8300 rpm safe fueling ceiling at 93% duty cycle.
The Powershot bumps the stock ecu boost limiter to 10psi, it does not change the rev limit. This was a big deal before the ECU tunes came out. Now with an ECU tune the boost limiter is gone anyway. The benefit now is to add or pull fuel in 3 different tunable zones. It's not a really smooth deal, but you can keep your AFR's right on with different mods, weather, and elevation.
I ran the ET Low Boost wheel with just a Powershot before I got the tune. Had tons of power, and went 50 mph with a pretty good load in the boat. You would probably be very happy with that setup, and could just pitch the impeller up to get off of the rev limiter. Much cheaper and safer route. Could probably get 52-53 mph out of it with the stock rev limit.
The problem is the Powershot cost almost as much as Dean's Tune. I found mine used pretty cheap, but I don't see a lot of them for sale. Might as well get the tune, but then you have to spend even more money getting the impeller right.
This kind of snowballed on me. At first I just wanted to run the wheel and pitch up the stock impeller. After running it, it seemed like it needed a lot more pitch, so I started looking at aftermarket impellers. Then I thought that I could get a tune for just a little more $$ than the impeller, and that would get me 54 mph at 8300 rpm with the stock impeller. Then the tune blows my expectations away, and I'm back looking at impellers, but now with way more power than I was expecting. Now the 160mm impeller will probably be a little too much for the ETLB wheel, and I'll be looking for more power to get the rpms back up. The next step will be a 16 psi wheel and fuel psi regulator. Then cooling mods, cams, retainers and so on...
That is why I say that a wheel and tune that keeps the stock impeller and runs 8300-8400 rpm would be ideal. Greenhulk.com will gladly get you caught in their $500 a piece go fast parts snowball.
