Are RPM's important?

Legdragger

Legdragger

Bringing it back
Location
New Hampshire
How important is it to be getting high rpm's if you are freeriding or freestyling? I can see you need them for long straight aways in racing conditions but when do you need them for jumping?

I run 650 electics on my 840 Kawi and the rev limiter is super low ( like 6200). However I have a Dale's Bad Attutude CDI with no rev limiter ( I think). I have yet to test the Dales ignition but figured it was worth asking to see what I would be getting into if I tried it.

Do higher Revs help you freestyle or freeride?
 
RiverRat

RiverRat

.......
Location
Louisville, Ky
low to mid is where it is more important for freestyle. Freeride is more mid rpms, you want to be smooth in the surf so you don't need that nasty low end grunt.
 
Watty

Watty

Random Performance
Location
Australia
Depends what you have done to your engine, and where you are most likely to see the best range of power. For example, an engine that has been ported to race is most likely going to have the best of it's power band in the mid to tope end.

I like to have a ski that pulls good rpms for things like reo's and snaps/tail slides on the wave face. If you are talking tuning for high rpms versus having a boat that only pulls a certain rpm because of a limiter, well, thats a whole different kettle of fish, and I'm sure people will tell you it depends on your riding style and personal preference...
 
Legdragger

Legdragger

Bringing it back
Location
New Hampshire
Basically what I am trying to figure out is does my 6200 rpm limit hold me back much with my freeride 840 motor. Or am I barking up a tree with no fruit for freeride/freestyle help. I guess I can answer this question myself by trying the no rev limiter CDI but it kinda freaks me out thinking there is nothing stopping me from over revving if I mess up and do a panic rev in a roll or something.
 
Legdragger

Legdragger

Bringing it back
Location
New Hampshire
Mile9c1 said:
6200 RPM is weak, for all riding conditions. Trade anything for more RPM's!
Click to expand...

This is what I am trying to determin. Thank you for your input.

So that is one vote for get rid of the 650 CDI. I will test the Dale's Bad Attitude next. After that I think I will switch back to a 750 style electric and try an advent or maybe go to yamaha 61X electrics and just go with an enhancer. It should bolt right up.
 
Crab

Crab

thanks darin...noswad!
Location
Seattle
Pete, ask yourself: do you stay on the throttle after leaving the lip of the wave? I instinctively let off, but then I havn't got upside down yet and probably would have my hands clenched in fear and not be thinking about that.
 
Legdragger

Legdragger

Bringing it back
Location
New Hampshire
Miles,
I run a wet pipe with a sj mod chamber.

The better I get the less I give it the panic rev but it definately was happening a while back. Not really so much now. In the lake I have been known to just clamp it and hope for the best trying to do rolls.


So to make sure we are on the same page. It would be advanagous to rev over 6200 rpm for freeride and freestyle?

Crab,
The TBM needed a little machining to work perfectly. It is still at the machine shop but i hope it will be done in a day or so so I can try it this weekend.
 
Mile9c1

Mile9c1

X-H2O.com
Location
Grand Rapids, MI
Legdragger said:
So to make sure we are on the same page. It would be advanagous to rev over 6200 rpm for freeride and freestyle?
Click to expand...

Hell yeah, you don't want to get there and then hit a wall. You lose a lot of momemtum that way... I imagine you get to 6,200 very quickly.

If you port an engine for max RPM you will lose some low end (obviously), but if you limit your actual RPM's, that's just like giving up free horsepower.
 
Crab

Crab

thanks darin...noswad!
Location
Seattle
Legdragger said:
Miles,
I run a wet pipe with a sj mod chamber.

The better I get the less I give it the panic rev but it definately was happening a while back. Not really so much now. In the lake I have been known to just clamp it and hope for the best trying to do rolls.


So to make sure we are on the same page. It would be advanagous to rev over 6200 rpm for freeride and freestyle?

Crab,
The TBM needed a little machining to work perfectly. It is still at the machine shop but i hope it will be done in a day or so so I can try it this weekend.
Click to expand...
Figure out what it takes to duplicate that part, you may have people wanting some.
 
Marshj

Marshj

DarkHorse
Location
Ann Arbor
You are losing a lot of Power by having your Rev Limit that low. Yes a freeride ski feels most the power down low, but the motor is still reving high. Having a ski hit the correct RPMs is key to power and pull (not soley top end related), it is important to have all things working together; timing, rev limit, prop so you spin the correct rpms (where your motor makes its best power, which is most likely above 6200 rpm).

Think of it this way, If i pitch my prop too large and my boat revs (or in this case bogs) out at 6400 rpm, I am not reaching where my peak horsepower is produced (around 7100-7300 on many superjets). This you can really feel, when a boat is overproped and therefore doesnt "wind out'. The reason for lightening flywheels, etc is to reach the peak RPM (Horsepower) numbers faster (aka get to your power faster by reving there quicker). You are choking that motor out at 6200 rpm. I think youll be very, very surprised at the gains with the higher rev limit.
 
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Crab

Crab

thanks darin...noswad!
Location
Seattle
Marshj said:
You are losing a lot of Power by having your Rev Limit that low. Yes a freeride ski feels most the power down low, but the motor is still reving high. Having a ski hit the correct RPMs is key to power and pull (not soley top end related), it is important to have all things working together; timing, rev limit, prop so you spin the correct rpms (where your motor makes its best power, which is most likely above 6200 rpm).

Think of it this way, If i pitch my prop too large and my boat revs (or in this case bogs) out at 6400 rpm, I am not reaching where my peak horsepower is produced (around 7100-7300 on many superjets). This you can really feel, when a boat is overproped and therefore doesnt "wind out'. The reason for lightening flywheels, etc is to reach the peak RPM (Horsepower) numbers faster (aka get to your power faster by reving there quicker). You are choking that motor out at 6200 rpm. I think youll be very, very surprised at the gains with the higher rev limit.
Click to expand...
I think of it like this: I want to top out at around 40 mph, and around 7000rpm, so what prop will get me there. Its all about arm ripping acceleration, and I could care less about top speed. Those stock 650's were designed to last a long time under normal conditions, not maximize power potential.
 
S

sflsurfrider

im currently running a 550 coil in a 650 box w/ a 650 stator. works great. no rev limiter and itll work on the 750 too.

rev limiters suck.
 
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