Thread: High Altitude Mods
05-30-2009, 08:56 AM #1
High Altitude Mods
I have a bone stock 07 RXP that runs 64 mph at 7200 rpm at an altitude of about 4500 ft, I think that I need to make some mods for the high altitude, but what? I see guys posting all the time about the rev limiter being over 8000 rpm, and my machine never gets anywhere near that. Any ideas where I should start? I don't want to do anything that would hurt the power at the lower rpms, and I am not really concerned about going much faster than it does now.
05-30-2009, 09:08 AM #2
First and foremost you need mods that will help the engine breathe. Second you will need to add boost to make up for the high altitude. Third you will need to find the prop pitch that gets you around 8100 RPMs once you're done modding.
Since you're 900 RPMs short of the sweet spot I would recommend adding a large amount of HP. I would expect it to be around 7500 at that elevation. You might want to check the slip on your supercharger.
The parts I would get, while staying on a semi-tight budget, are a X-charger, XS IC, Riva rear air intake, and try a 14/19r solas prop.
05-30-2009, 09:11 AM #3
Start with a air intake that will increase your rpm
05-30-2009, 01:12 PM #4
Id start w/ an intake great, air intake, and a different charger. Id just get an x-charger and not even change the prop.
05-30-2009, 01:17 PM #5
05-30-2009, 02:10 PM #6
What horsepower is the RXP, 215 or 155 ??? Did SeaDoo make the 155 RXP in 2007?
EDIT: Stock RXP at 64 MPH at 7200 RPM ???
05-30-2009, 03:13 PM #7
[quote=jpeconsult;1077891]What horsepower is the RXP, 215 or 155 ??? Did SeaDoo make the 155 RXP in 2007?
I'm sorry, I forgot that, it is a 215. The supercharger washers have been replaced with metal ones and the slip is exactly the same before/after the washers were changed, so I don't think there is any sort of problem, except altitude.
It runs the same as it always has, it's just that since I have started reading all these posts, I start to wonder why my machine doesn't get anywhere near the rev's that everyone elses does, and I just figure it has to be the altitude. If I had never read any of these posts, I would have never thought about it.
I do plan on installing an external cooler and some exhaust mods soon.
05-30-2009, 05:31 PM #8
hello paul. letter,breathe, add power, and then its all about the prop.get your rpm up, good luck.
05-30-2009, 06:11 PM #9
If smooth, then go with a big SC, and let it breathe.
05-30-2009, 06:21 PM #10
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