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Thread: Prop bending?

  1. #1

    Prop bending?

    if im at 7900rpms with a 13/23 what would i bend to get 8300-8400?


  2. #2
    64physhy's Avatar
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    There are lots of threads on this. If i remember correctly, every degree on the trailing edge gets you about 200 RPM. So 13/21 should get you where you want to be. 7900 seems low for the mods you have, even with the 13/23 prop.

  3. #3
    I might be more rpms, I will know wednesday...

  4. #4
    lets race.... mikeFZR's Avatar
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    Every degree is approx 100 rpms. Check out the prop bending thread in the how to section, it is a sticky..

  5. #5
    Taking money away from the Z06 Fund
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    With your mods, you should be seeing around 8300-8400 with the 13/23 if the prop measures out to 23 on the trailing edge. Most box stock Skat 13/23s measure out at 22 on the trailing edge though, mine did. What are your AFR #s? You might be a little lean and the lower rpms would reflect that. With a 13/23 though you should be at least at 8300rpms if anything. How many lbs of boost are you seeing at 7900?

  6. #6
    I will know all that info tomorrow, I was just throwing it out there. This is what I do know, Im over 8000rpm on stock tach,AFR's are 12.0-12.2 at wot, autometer boost gauge reads 11 im guessing cause it moves so much. With 6ft of vacuum line to gauge would it read lower?

  7. #7
    [email protected], Gashog301,2010 SHO, Stage 2ish, 185lbs, Water 85F, Air 88F, sea level, Full tank fuel, trim neutral, Riva air intake with ribbon delete, supercharger R/D C3-11 (13psi),Riva power cooler intercooler, 13/23, Riva thru hull exhaust Riva waterbox, Stock nozzle, hull mod's (R/D intake grate,R/D rideplate jims mods,R/D pump seal kit,Hull reinforced,drive shaft sleeve .), injection mod's (R/D R3), Stockengine, free mod's (Foam inserts removed).

    Looks like I wont have to do anything with my prop, im happy with everything! Wish I could get 80mph.... lol
    Oh AFR was 12.0-12.3 at WOT.

  8. #8
    Taking money away from the Z06 Fund
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    Quote Originally Posted by gashog301 View Post
    [email protected], Gashog301,2010 SHO, Stage 2ish, 185lbs, Water 85F, Air 88F, sea level, Full tank fuel, trim neutral, Riva air intake with ribbon delete, supercharger R/D C3-11 (13psi),Riva power cooler intercooler, 13/23, Riva thru hull exhaust Riva waterbox, Stock nozzle, hull mod's (R/D intake grate,R/D rideplate jims mods,R/D pump seal kit,Hull reinforced,drive shaft sleeve .), injection mod's (R/D R3), Stockengine, free mod's (Foam inserts removed).

    Looks like I wont have to do anything with my prop, im happy with everything! Wish I could get 80mph.... lol
    Oh AFR was 12.0-12.3 at WOT.
    Congrats on the new speeds, Nice results!!

    Looks like you are dead on where I thought you would be with the 13/23 prop and your mods.

    That's very interesting to see that your AF #s are spot on with No FPR or Powershot and the R3/C3, very interesting. I am about to make a post where my R3 didn't provide enough fuel for my ET LB wheel and 13lbs of boost. You are not running a FPR or Powershot, correct?

    I'd also try with less fuel and putting your trim up 1 from neutral, so the bow lifts up higher, should be able to get a little more speed out of it.

    Nice job though! Not sure where you are located, but if you are close to Florida, take it to Jim's Performance and you will see 80 no problem!

  9. #9
    Southern Maryland, no rrfpr or power shot. Tried trim up and got allot of bounce.

  10. #10
    lets race.... mikeFZR's Avatar
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    Quote Originally Posted by gashog301 View Post
    [email protected], Gashog301,2010 SHO, Stage 2ish, 185lbs, Water 85F, Air 88F, sea level, Full tank fuel, trim neutral, Riva air intake with ribbon delete, supercharger R/D C3-11 (13psi),Riva power cooler intercooler, 13/23, Riva thru hull exhaust Riva waterbox, Stock nozzle, hull mod's (R/D intake grate,R/D rideplate jims mods,R/D pump seal kit,Hull reinforced,drive shaft sleeve .), injection mod's (R/D R3), Stockengine, free mod's (Foam inserts removed).

    Looks like I wont have to do anything with my prop, im happy with everything! Wish I could get 80mph.... lol
    Oh AFR was 12.0-12.3 at WOT.

    Awesome, glad you are liking the mods! You could repitch up to 8500 to get past 80. But more importantly, repitching will allow more rpms and, thus, more HP which will cause your bounce to go away. This is because currently your ski isnt producing enough hp to handle the rideplate angle so more hp = less bounce. But if you are happy and don't want to teak around than you can always leave it as is

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