Suprising results on RXT

[Foggy]

Have 5 hours now on my RXT..
Did a little more modding, actually de-modding saturday.
Removed the Rotax Racing I/C.. Put back in stock resonator.
Was just too loud for me..
Anyhooo, I did not have time to put back in stock I/C..
so i just ran without it. Wanted also to see if I could find
cause of P1544 exhaust code at WOT.
Finally had my GPS with me.
Results: 68 mph @ 7920 rpms

water 62*, Air 62* Full tank of gas 250+ rider
I know i would lose a lot more rpms if were warmer.
But I am back to being stealth quiet now

Me thinks I will wait until I can get an exteral i/c from
an X model when price is right so I can keep quiet.

Can some one remind me where is best place to drill/tap
vacuum/ boost hole in intake manifold as I will be putting
back in stock intercooler this week and will lose my block off
fitting???

Note: I did notice less low and midrange power and less holeshot
with no intercooler vs. RR . I have never run this boat with stock i/c so I'll find next weekend what somewhat stock boat is like.
I did tap on 8000 couple of times, but would not stay there.

[Foggy]

Also, NO P1544 Exhaust code/beep/ limp mode anymore!!!!

[lafjax]

Can some one remind me where is best place to drill/tap
vacuum/ boost hole in intake manifold as I will be putting
back in stock intercooler this week and will lose my block off
fitting???

There are 3 protrusions on the intake manifold, one for each cylinder. Usually we drill the front protrusion, cyl 3, and use it for the vacum take off.

[engineermike]

I too got surprising results out of an RXP with no intercooler. See the link below.

http://greenhulk.net/forums/showthre...ht=intercooler

[Foggy]

Thanks Larry, I will drill and tap front cylinder intake runner then to
get vacuum for my RRfpr

[lafjax]

Thanks Larry, I will drill and tap front cylinder intake runner then to
get vacuum for my RRfpr

Look for the protrusion, no tapping required. Just drill through the little barb sticking out to open it up and attached the rrfpr vacum line.

[Foggy]

Cool, so just basically opening up the "tittie" already there
by sea doo!