boost for rotax racing wheel

[hydrojunkie]

what should i see as far as boost for a rr wheel. i have a sun pro boost gauge @ 7900 its 6 to 7 psi is the gauge wrong or leeking air somewere

[HOSS]

One of the 2. I personnally wish I wouldn`t have given my RR wheel awayIf your staying with the stock intercooler, ecu and injectors,,it cant be beet! Now I`ve never even seen the green wheel so i cant say but from what I`ve read it would seem comparable or even better. 74 mph now on my friends 05 RXT. These are the mods,,and no bs! rr wheel, riva 3" intake, bone stock rxp prop, ride plate filled, riva intake grate(knifed), Riva catch can, reverse bucket carving, 2 degree wedge, strainer, metal washers, iridiums, lined up throttle blade, and I yanked the resonator. Average on glass is 74.6. Thats all the mods done. Just a completely reliable ski and faster than damn near most. Slower than a few. Oops,,,I flipped the wear ring. The ski NEVER breaks!

I`m actually leaning towards another ski just to make this a flat water rocket (my `05 RXP). A Honda may be in the works for me,,,those things are light!

[lafjax]

riva intake grate(knifed),

Hoss, what does "knifed" mean, edges sharpened up? or wings cut off?

I've got the mods below and can only reach 70.2 best.

[HOSS]

Yes,,,sharpenned and light material removed. I actually did alot to the "ramp" and shortenned them by about 1/4 inch. I know you dont wanna hear this but,,,can I give you a suggestion? I dont see ECU? If not, loose the 42`s. Next, for what you`ve got,,,the stock intercooler would be best. The S3 I found if you dont need off the line power for jumping waves,,,chit can it! For an RXT,,a bone stock RXP prop seems to work awsome. This was all done with GPS. I`m not a prop wizard but the stock RXP prop is the ticket,,at leat on this ski. He runs 93 from Chevron, all day long, its an `05 RXT,,best part is that its consistently dependable. Hell, I barely get to ride due to down time. This thing hits the 8150 mark at wot and stays pegged just like new. Not over propped or under. Just perfect as hell. Funny thing is he doesnt have VTS like all the RXP`s. This cat rocks from GO!

[lafjax]

This thing hits the 8150 mark at wot and stays pegged just like new. Not over propped or under. Just perfect as hell. Funny thing is he doesnt have VTS like all the RXP`s. This cat rocks from GO!

That's good information, I'll work on it some more...
Thanks

[DIGGS]

what should i see as far as boost for a rr wheel. i have a sun pro boost gauge @ 7900 its 6 to 7 psi is the gauge wrong or leeking air somewere

i am getting around 9 at 8100 with xs and rear air

[smc]

11.3 at 8550 at 80 degrees
11.1 at 8550 at 90 degrees
11.5 at 8550 at 70 degrees****

****only tried once.

[The Bandit]

11.3 at 8550 at 80 degrees
11.1 at 8550 at 90 degrees
11.5 at 8550 at 70 degrees****

****only tried once.

Is that while riding superman?

[smc]

No, I stand. Superman on Lake Ontario is one step short of death. Mark Underwood and I are trying to figure out why the boost is so high. At 8550 rpm the RR Wheel should push 10.7-10.8-10.9. I don't know what the wheel will do at around 8000, but your number seems low. There is a thread about 10 days ago trying to give numbers for all wheels.

[RXP-REX]

11.3 at 8550 at 80 degrees
11.1 at 8550 at 90 degrees
11.5 at 8550 at 70 degrees****

****only tried once.

You have to be running the spacer with the RR wheel to get those boost numbers.