Thread: Mini-rude to 2rude
02-02-2012, 09:08 PM #1
Mini-rude to 2rude
I upgraded from a Riva XX to a 2rude recently. (after all my issues with stripping the driveshaft splines, etc)
At the same time, I installed a skat 3 blade prop, and replaced the whole carbon seal assembly. The ski feels a little doughier down low, but pulls hard up high. I was expecting it to be the other way around from my readings on 3-blade props. Nearly feels as though it has turbo lag .
Im not sure if this is due to the 3 blade prop, the 2rude, or a combination of both..
Has anyone upgraded from the mini to the 2rude before and got some results? Its hard for me to compare as the prop change occurred at the same time, but overall I'm not sure if I prefer the feel of the ski now over my previous setup.
I ran 79.4 @ 8420 with the 15/22 and 83 nozzle. I havent had a chance to GPS again since the mods, but I would imagine I gave up a mph or 2.
02-02-2012, 09:33 PM #2
Id have though both should have given you low down performance.
How many RPM will it turn? maybe prop has too much pitch?
No boost leaks? slip on supercharger?
02-02-2012, 11:42 PM #3
You need to put the 4 blade back on to get a good comparison on the chargers.
What pitch is on the 3 blade?
02-03-2012, 12:02 AM #4
I haven't had a real good chance to check peak rpms as yet. I've seen 8300, but it may turn more in real
calm water. It's a 15/19 I bought off damo.r which he added 3mm to. He had it set up for a low boost turbo.
I no longer have th 4 blade, it got chewed up along with the driveshaft.
Slip is fine, but my boost gauge only shows 11-12 psi.. It's only a cheap digital one that reads to the nearest 1psi so I don't put to much trust in the readings. All my intercooler pipes are secure so I don't think I am losing boost.
02-03-2012, 08:24 AM #5
My thinking is you need to get a 4 blade as Steven said to compare. I liked the 3 blade on my ski over the 4 blade but I think I was giving up 1-2 mph on top.
02-03-2012, 08:27 AM #6
Do you use adjustible nozzle rings? On my setup, when I went to a small ring (79 mm) it felt somewhat like you are describing as mushy down low
02-03-2012, 09:13 AM #7
A ski can feel doggy, if you are not turning close to the rev limiter. I wouldn't run a 3-blade on a RXPX it will stuff earlier at speed and easier when you let off than a 4-blade be careful. The 3-blade is a great prop for holeshot on a RXP, not real sure if its needed on a RXPX. I have seen two RXPs with the same mods drag race each other many times. The 3-blade RXP pulls a 2-3 skis on the holeshot and than the 4-blade ski comes around and passes the 3-blade everytime.
02-03-2012, 09:24 AM #8
If its a 15/19 with 3 mm added I bet its to much pitch.
02-03-2012, 06:00 PM #9
Thanks or all the input guys. I bought the 3 blade as it was available to me at the time.
Steven- that's exactly what it is.
Damo has been in contact with me and said it certainly sounds like too much pitch.
02-03-2012, 09:08 PM #10
toss on an 85mm ring & see what happen before you pitch it..
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