Freestyle PV's

[yamaboy2000]

at what rpm should the PV's start to open on a lamey freestyle cylinder?? and how does one check that setting..DASA/Racers edge tells me that mine are set to open at 5000rpm but that sure seems late in the rmp game for freestyle to me..:brap:

 

[crammit442]

at what rpm should the PV's start to open on a lamey freestyle cylinder?? and how does one check that setting..DASA/Racers edge tells me that mine are set to open at 5000rpm but that sure seems late in the rmp game for freestyle to me..:brap:

If you ever have the chance, ride around while looking at a good tach. You'd be surprised at how high your R's are. You'll hear a lot of talk about off-idle response. You can't really even ride a standup at idle, so they're really referring to response at 3-5000 rpm. At just above and below planing speed you're around 3500-4500. My ECWI is set to begin shutting off at around 5000 also, so I'd imagine you're in the ball park. Plus Lamey knows way more than anyone here about that setup.

Charles

 

[Jr.]

at what rpm should the PV's start to open on a lamey freestyle cylinder?? and how does one check that setting..DASA/Racers edge tells me that mine are set to open at 5000rpm but that sure seems late in the rmp game for freestyle to me..:brap:

Keep in mind, the idea of the PV is to allow for an adjustable ex port timing while the motor is running. The lower timing is what is normally desirable for bottom end.
As Charles stated, you will be surprised where you are actually running in the powerband at a given rpm.

One of the best sources for how the PV works is found in the Sea-Doo racer manual. It goes into debth about the PV's & the theory behind them. I'll see if I can scan it & post for you.

Here is a little trick I use while tuning PV's. Cut a port or window in the plastic cap, so you can see the PV working. Hook up your Tach.
While the boat is in the water with a load, rev the motor & watch the PV & keep a log book on the movements.
The springs are relatively cheap from SD. Don't be afraid to clip coils off to adjust the tension. I have found the better overall spring to use is the "Red" ones off the early 800's

Have fun tuning!!!!

ski ya, Paul

 

[SUPERJET-113]

Keep in mind, the idea of the PV is to allow for an adjustable ex port timing while the motor is running. The lower timing is what is normally desirable for bottom end.
As Charles stated, you will be surprised where you are actually running in the powerband at a given rpm.

One of the best sources for how the PV works is found in the Sea-Doo racer manual. It goes into debth about the PV's & the theory behind them. I'll see if I can scan it & post for you.

Here is a little trick I use while tuning PV's. Cut a port or window in the plastic cap, so you can see the PV working. Hook up your Tach.
While the boat is in the water with a load, rev the motor & watch the PV & keep a log book on the movements.
The springs are relatively cheap from SD. Don't be afraid to clip coils off to adjust the tension. I have found the better overall spring to use is the "Red" ones off the early 800's
Have fun tuning!!!!ski ya, Paul

When i raced my 96 XP and was tuning them to go off at the right time in the power band on the way to the first buoy, I had a 1/2 hole drilled in each cap like Paul said to see when they are going off.

Also i liked the green bellows instead of the red ones and instead of using the seadoo springs that hold the bellow caps on, I used .045 SS saftey wire wrapped around and twisted and and tucked in. Or you can take the stock spring, cut it and put the SS wire inside the oem spring retainer and the twist it and tuck it in. The stock ones suck real bad and leak(should of made that 800 SD rave motor black instead of white!).

Here's the RAVE valve section from the 96/97 Seadoo racers manual CD. I couldnt figure out how to copy it, so i screen printed it:

 

[DAG]

nice read

 

[JonnyB]

I used .045 SS saftey wire wrapped around and twisted and and tucked in. The stock ones suck real bad and leak

Also you gain a few RPMs(50-100) with the wire

 

[SUPERJET-113]

Also you gain a few RPMs(50-100) with the wire

How do you figure?:dunno: