Thread: 2014 fzr svho impeller
03-05-2014, 02:38 PM #1
2014 fzr svho impeller
Was curious if anyone has done any testing of impellers on the new svho fz ski. I have been an avid reader of GH and decided to join now so maybe I can make a contribution since I have a new ski that I am beginning to mod. currently I have done the power filter and intake upgrade at the 2.5hr mark. I am going to wait till they have a true flash for this ski before I proceed there but was wondering if a different prop would get me more RPM or if it will just be tuned back by the ECU. Also I have noticed that I will get approx. 7800rpm for maybe 10 sec and then it drops off to 7300ish is this part of a 10hr break in or will that always be there. I can blip the throttle and it will jump back to 7800 for another 10sec or so and then fall off again. thanks for any help
03-05-2014, 03:18 PM #2
I understand that the rpm behavior is part of the way Yamaha do the speed limiting.
03-05-2014, 03:56 PM #3
Welcome aboard the Hulk...
I see you've already caught the mod bug...
03-05-2014, 04:38 PM #4
and yes I already have a 2012 VXR that is slightly modded but told the wife as soon as it was paid off she could have it cause I was stepping up, so needles to say the day I payed it off was the same day I purchased the FZ.
03-06-2014, 12:43 AM #5
With a tiny tach this yamaha 2014 turns 7680 rpms and then go down to 7280 and i did run 70.9 to 70.2 mph the ski is bone stock.
03-06-2014, 09:55 AM #6
03-06-2014, 12:04 PM #7
Well I know with boat props SPEED = (RPM/GEAR RATIO)*(PITCH/1056)-%SLIPAGE so I guess what I am really wondering is if I go from a 14/20 pitch to a 14/23 shouldn't I pick up some speed from the larger pitch even if I'm held at 7300rpm, because the motor should have plenty of power to push the 23 or maybe even larger. I know a pump wont have a gear ratio like outboards do but should be similar concept correct? thanks for any input as I am new to this with impellers but have done it a lot with outboards as we own a boat dealership here locally.
03-06-2014, 05:58 PM #8
If you go with a 23 pitch then you won't be held at 7300 RPM when the limiter kicks in.... it will be more like 7000 RPM.
With these jet pumps RPM = Speed. Give up 300 rpm you are giving up 2.5-3 mph.
Not only that, running an impeller that's pitched too high will cause the ski to feel sluggish.
It's very important with a jet pump that the impeller is perfectly matched to the mods on the ski and in the case of the SVHO Yamaha nailed the pitch perfectly. The stock pitch impeller is also working great on a ski running a reflash.
03-06-2014, 11:27 PM #9
03-07-2014, 02:28 AM #10
It's an artificial red line
So it will always be on it
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