Thread: chargers and boost #s
07-04-2009, 06:43 AM #1
chargers and boost #s
I am in the research process prior to upgrading our rxts (o6 and 07). We are planning on having the superchargers upgraded, probably an equivalent to a stage 2 or stage 2+. We currently have a stage 1 minus the 2 degree pump wedge given the chop.
My search was partially only paritaly successful. I was wondering what the boost numbers were for the different chargers at stock (8100) and performance (8500) rpms. A portion of this was listed in this intro post by Greenhulk but it did not have the boost #'s. Also is the X charger equivalent or is it more boost than the Riva stage 3?
07-04-2009, 07:35 AM #2
I don't mean to steer you away from the topic at hand....but....what do you have against a wedge in the chop?
07-04-2009, 07:44 AM #3
I imagine that is why the wedge is not recommended with the pump extension kit.
07-04-2009, 07:51 AM #4
Ok, Well lets just remember a couple things. Boost is not just the only factor in a SCer you are looking at.
Stock 215 HP SCer is a 127mm wheel about 7lbs of boost (Stock boat)
Stock 255X SCer's are 137mm wheels and 9.5 lbs of boost stock! (sTOCK BOAT)
Stage III SCer is a 127mm wheel upgraded to a Riva and is about 9.5lbs of boost.
X SCer's also have a Riva drop in replacement and I believe they are 12lbs. of boost.
What you need to remember if a Wheel produces close to the same boost it doesn't mean it is better and for example I say Stage III compared to a X SCer. They produces dang near the same boost numbers, but the XSCer is better!! Why? Well because it is a 137mm wheel over a 127mm wheel. It is bigger and will flow more air.
Now going to the Bigger SCer's I did not mention as you stated equivalent to a stage 2 or stage 2+.So if you go into the Rude 1, 2, and 3 you have a bunch more stuff and also ET 68-140, et extreme, and et Race.
A bunch of SCers out there.
I hope this helps a little.
07-04-2009, 07:57 AM #5
Now ofcoarse I forgot to mention the
1st Gen drop in Riva 7.5 ( throw in trash)
Greenwheel is a 127mm drop in replacement at 9lbs of boost
Rotax racing drop in wheel (Samething)
Riva Gen II (Samething.)
These's 3 wheels are dam near if not the same thing. 127mm wheels and 9.0lbs of boost.
07-04-2009, 07:57 AM #6
This strictly seat of the pants and personal eyeball only here so...take it for what it's worth.
I run faster than a stock rxt in the chop. Of course...to me....a wedge should only be used in conjunction with skegs.
07-04-2009, 08:01 AM #7
As for the sc boost #'s.....I've asked this before elsewhere.
What additional parts requirements are needed to run bigger sc's in stock boats.....(in re to safe engine reliability)......?
07-04-2009, 08:29 AM #8
Thanks guys, helpful info. I overlooked the basic principal that boost does not always mean power, movement of air also dictates power as well so the larger charger may move this air more efficiently. I was thinking on going with the x-charger, 42# injectors, xs intercooler. I want to use the stock exhaust outlet but remove the sound baffle. of course i will have to change the prop from stage 1. for now i will keep the same ecu. as for the opas (training wheels) will like to keep them for the "stock look" but i may end up removing them.
07-04-2009, 08:39 AM #9
It is always a great idea to get a A/F ration gauge to be safe, but there are plenty of guys on the forum that can guide you with that set up.
07-04-2009, 09:08 AM #10
i was trying to get around the whole wideband by using a setup that has been proven. so that was why i was looking at the x-charger and its injectors. even if i go with the stock computer will i still need to go with the wbo2?
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