Important information for everyone who mods there ski

[2fast4u]

I have said this 100 times! Guys If you are moding your SHO. FZR,FZS if you do NOT get your Target rpm's correct you will never be happy with your results! If you have a OEM ignition box unmodified your target rpm's should be 7600-7700. If you have a R1, R2, Vipec ,Motec then 8350-8450 is where you want to be. If you have a full built motor valves, springs, rod, pistons cam's ect. then you can even go higher if you want to. Anything less than these target rpm's will result in less than otimum performance. The correct PROP pitch is a must! This is regardless of what mods you have on your ski. Note: A GOOD AFTERMARKET TACKOMETER IS A MUST HAVE IN ORDER TO GET YOUR RPM'S CORRECT! Tommy Jordan

[mikeFZR]

Good info Tommy.

[305coco]

AMEN TO THAT!!

guys take your time and read and take notes, seems like the same questions are being asked back to back on the forum lately..

[2fast4u]

Good info Tommy. When you are measuring the leading edge of your prop how far in do you measure? I know for the trailing edge you recommend the last 2.5 inchs. Thanks.

2.5 inches from where the leading edge is closest to the wear ring on a swirl prop

[2fast4u]

AMEN TO THAT!!

guys take your time and read and take notes, seems like the same questions are being asked back to back on the forum lately..

Since it's Sunday I thought I would do a little preaching to the masses!

[mikeFZR]

well according to my measurements my skat 13/23 is really a 14/22

[hdlefler]

Tommy-
Did you confirm via GPS that your exhaust mod vs. the riva free flow set up was no difference in speed? I'm thinking on doing your mod to my FZR.

[2fast4u]

Tommy-
Did you confirm via GPS that your exhaust mod vs. the riva free flow set up was no difference in speed? I'm thinking on doing your mod to my FZR.

same speed!

[BPnta]

Tommy-
Did you confirm via GPS that your exhaust mod vs. the riva free flow set up was no difference in speed? I'm thinking on doing your mod to my FZR.

The best part about Tommy's mod is very little DRONE

[pituco]

Are the RPM given by the jetski correct?...mine don't go over 8000 and i heve all those mods

[hitman]

+1,000,000

Keep driving home this point Tommy. Everyone will be happier with their setups if they keep their target RPM in mind AT ALL TIMES. If you realize you are down on RPM one day, then you don't have to be bummed that your speed is not there. When you get the RPMs back on target, the speed will come.

Are the RPM given by the jetski correct?...mine don't go over 8000 and i heve all those mods

All what mods? You need to be really specific. As in every single mods even down to nozzle size at it ALL effects RPM. It helps if you keep your mods in your signature and up to date. That way you don't have to post it all the time and people can answer your questions easier.

[sdman]

I have said this 100 times! Guys If you are moding your SHO. FZR,FZS if you do NOT get your Target rpm's correct you will never be happy with your results! If you have a OEM ignition box unmodified your target rpm's should be 7700-7750. If you have a R1, R2, Vipec ,Motec then 8350-8450 is where you want to be. If you have a full built motor valves, springs, rod, pistons cam's ect. then you can even go higher if you want to. Anything less than these target rpm's will result in less than otimum performance. The correct PROP pitch is a must! This is regardless of what mods you have on your ski. Tommy Jordan

Help me understand this. My fxr has the stage one mods with vx rideplate. The max rpms were 7760 to 7790. After putting on the 13/22r the rpms dropped to 7550 to 7590 with maybe 1mph top end (maybe) and slower acceleration up to 55mph. Is it better to leave the stock prop on since it is in the target range? I've never heard any type of popping sound that is associated with bouncing off the limiter. Thanks for your help.

[305coco]

Help me understand this. My fxr has the stage one mods with vx rideplate. The max rpms were 7760 to 7790. After putting on the 13/22r the rpms dropped to 7550 to 7590 with maybe 1mph top end (maybe) and slower acceleration up to 55mph. Is it better to leave the stock prop on since it is in the target range? I've never heard any type of popping sound that is associated with bouncing off the limiter. Thanks for your help.

i had the same issue on my fzr with stage one mods, the 13/22 dynafly made the ski cavitate on holeshot and dropped the rpm's to 7500 wich made the ski sluggish, i repitched the prop to 14/20 the larger leading edge (14) eliminated the cavitation and the smaller trailing edge (20) brought my rpm's back up to 7700
its spot on now..

hope this helps you.

[sdman]

i had the same issue on my fzr with stage one mods, the 13/22 dynafly made the ski cavitate on holeshot and dropped the rpm's to 7500 wich made the ski sluggish, i repitched the prop to 14/20 the larger leading edge (14) eliminated the cavitation and the smaller trailing edge (20) brought my rpm's back up to 7700
its spot on now..

hope this helps you.

Thanks for resoponding. Did you notice any gain in top speed or acceleration?

Thanks again.

[poof100]

Thanks for resoponding. Did you notice any gain in top speed or acceleration?

Thanks again.

Tommy's post is spot on and I'll add that for every 100rpms you increase or decrease, especially over 7K when the motor is making boost, you gain or lose 1mph. I'm almost complete with my testing, but I have lots of testing that shows 1pmh for every 100rpms I gain. So, to emphasize what Tommy J is saying here, the higher your RPMs, the more speed you will see and the better the performance of the boat. Hitman's boat probably would only run 71-72mph if he was only turning 7700rpms. He's making the speed because he's turning the RPMs. Adding bigger power mods like SC wheels and IC only increases the effect of turning higher RPMs and hence more MPH.

I picked up 350rpms and 3.5mph just by depitching the trailing edge by 1 degree!!