Thread: Speedfreeks Set Back Mod
08-14-2010, 04:51 PM #1
Speedfreeks Set Back Mod
I am sending out my pump for the SpeedFreeks set back mod. I read on his site and it describes my problem perfect, can't quite turn a 14/19 fast enough with a Stage 1. Talked to Erik and am pretty excited. He seems as knowledegable as everybody says. I told him my problem and what I want and he completely understood. I am going to send it out Monday speedy delivery, hopefully throw in some extra bucks to get it shipped back quick and maybe try it out in a week. I couldn't find much feedback on this mod, just people saying his work always gives good results. Since I will be changing nothing else right now I will let you guys know how well it turns out.
Current best is 70.7 (on a different day)
Went out today to give him some solid numbers to use.
RPM's were 7800, give or take 20. I know the prop is causing low RPM's. Wear ring was good, I even flipped it anyway. Runs great and the low RPM's came right after the prop.
Exact Riva Riva Stage 1 with $100 block-offs and thru hull.
08-21-2010, 01:01 PM #2
Got my pump back today. Sent out Monday, received it back Saturday, it doesn't get any faster than that. I will install it today and try it out tomorrow. Hoping for to be a solid 71+, but more importantly have my RPMs back up. I know I am still not fast, but reliability is very important to me. My season is short and between work and spending time with my daughter I need my ski to work whenver I get time to ride it. I will post my results.
08-21-2010, 03:27 PM #3
Cant wait to hear your results..
08-21-2010, 04:54 PM #4
So I couldn't wait so I went out for about a half hour to try it out.
I immediately could feel the difference. The acceleration/torque is so much improved. I did my stage 1 piece by piece, and this mod had the best "seat of the pants" improvement. I gained 200 RPMS, so I am pulling a solid 8000, sometimes 8020 until I become unhooked. Not quite as high as I would like, but it is 78% humidity today. I am sure that isn't helping. Maybe if Erik reads this, he can chime in on that. I couldn't get a solid top speed reading due to the wake boats out today. This is a bad comparison, but on choppy days like it was today I would see about 68.5. Today I was getting 69.5. Don't take that too seriously though, I am trying to judge chop verse chop. I almost lost it at full speed hitting eveyone's wake trying to get a top speed number. I think one mph or more gain is a good guess.
Forgetting top speed though, the acceleration alone makes it well worth the money. This had the most improvement on acceleration as any piece of a stage 1 kit. I threw myself off once accelerating out of the buoys because I wasn't use to the "bite". Defintely money well spent for me and I would suggest it.
08-21-2010, 07:12 PM #5
- Join Date
- Jul 2010
- Daytona Beach
price looks to be good if the performance is that noticeable. i'll have to look into that when i get a prop.
08-21-2010, 07:23 PM #6
Obviously every set up is different, but I immediately noticed work had been done to the prop. Whenever I get a new ski (not soon) I will always have my prop sent to SpeedFreeks for this. Obviously you should get all other mods done first, since it would negate the pitch and such.
08-21-2010, 07:26 PM #7
- Join Date
- Nov 2007
- Branson, MO area
What is the set back mod? Is he machining the hub where it tightens against the shaft effectively moving the impeller toward the back of the pump?
08-21-2010, 07:34 PM #8
08-21-2010, 08:03 PM #9
Yes he machines the hub to set it back closer to the pump stator...
08-21-2010, 10:17 PM #10
I will add, that with this mod if you need alot of pitch on the tailing edge of your prop it will take some tweaking.
With say a 24 to 25 pitch your tip of each blade can rub the pump where it has the angle to stator.
Nothing that can be corrected but need to know what you are doing.
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