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  1. #1

    Farthings Twin Turbo 15f

    Anyone else see the pictures of Farthings twin turbo 15f on pwctoday.com? Looks awsome.
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  2. #2
    Team N2L #112 *Monster 15FKawi*'s Avatar
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    Wow its been done! My Dreams came true lol Can't Wait til see this in action or jus see some numbers..
    Dustin Farthing Mite Jus Take the World Finals wid this 1

  3. #3
    Rehab'ed Ron sixtydashone's Avatar
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    no point in twin turbo on a 4 stroke.. 1 single turbo would have been fine.. however props for being "different" and the ski looks pretty sick

  4. #4
    Heres what Farthing said about it on Pwctoday:

    The smaller the turbo the faster it spools up for better bottom & we use 2 so there is no lag so one is spooling each 2 cylinders.

    With 1.5 liter motor you dont have enough exhaust pressure to turn a huge turbo for alot of HP without having some turbo lag so we use two smaller ones for same overall HP rating as one large turbo with less turbo lag on bottom. The two turbos we use are able to produce up to 500hp

    We come off cylinder 1&2 to one turbo & 2&3 to the other turbo & out the back of the boat with both seperate.
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  5. #5
    ROTAX RACING performance
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    thats a BS build, no need for twin turbo if not a V engine

    2 x the heat problems
    2 x the weight
    2 x the turbo issues

    water getting in to the turbo from the tailpipe design

    if you run antilag, ther is no turbo lag, on a1.5 L engine, you still make 400 HP.

    by the time they will have the boat ready to run, Dustin will find out about the issues. they should have started earlier

  6. #6
    Rehab'ed Ron sixtydashone's Avatar
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    Quote Originally Posted by STXRacer192 View Post

    With 1.5 liter motor you dont have enough exhaust pressure to turn a huge turbo for alot of HP without having some turbo lag so we use two smaller ones for same overall HP rating

    ive built 1200hp 1.8 liter 4 strokes... i dont believe thats true for a second... besides, these turbos arent that big at all.. nowhere near big enough to see that much lag..

    and two Small turbos doesnt in anyway mean that it will replace one big turbo. The maximum output efficiency of the smaller turbo doesnt nescessarily "Double" just because your multiplying by Two, LOL...

    c'mon

  7. #7
    Twin parallel turbo on 1.5L seems silly, not serving the purpose.

  8. #8
    inchadeboca's Avatar
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    back to the old drawing board. now i gotta get a 2nd turbo....lol

    i can tell you that macc, judge and farthing were all runnin single turbo 15f's in the the 400+hp range. thats enough for me

  9. #9
    Mustangous's Avatar
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    Quote Originally Posted by STXRacer192 View Post
    The smaller the turbo the faster it spools up for better bottom & we use 2 so there is no lag so one is spooling each 2 cylinders.
    Well then you have half the pressure (only 2 cylinders now not 4) spooling each turbo so you didn't gain anything....

  10. #10
    RonJon's Avatar
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    Quote Originally Posted by Mustangous View Post
    Well then you have half the pressure (only 2 cylinders now not 4) spooling each turbo so you didn't gain anything....
    Not entirely true... mass is what keeps a big turbo from spooling quickly. As an object increases in size, it's mass (weight) increases at a factor of spuare (^2). This is a mathmatical fact.

    Translation: take a circular piece of metal that has a diameter of 2" and weighs 3lbs. If you were to double the diameter to 4" then the weight would be squared to 9lbs.

    So... If you want the big turbo to process roughly the same amount of air as the 2 smaller ones than this is true: you can have exhaust from 4 cylinders turning 9lbs of turbine mass, OR you can have exhaust from 2 cylinders turning 3lbs of turbine mass.

    One turbo: = 4.5lbs of turbine weight for every 2 cylinders.

    Two turbos: = 3lbs of turbine weight for every 2 cylinders.

    So two turbos on 2 cylinders each WILL spool faster than one turbo on 4.

    Please, please... I am aware that these turbine wheels don't weigh exactly 3lbs or 9lbs or whatever... that was for illustrative purposes. But the math is still the same...

    The larger turbine wheel mass is THREE times that of one of the smaller ones, but it can process only TWICE the air. So if two turbines process roughly the same amount of air as the single big one, then their total combined turbine mass will be 50% LESS than the single big one's. Now guess which setup will spool faster...

    Btw I'm a Propulsion Engineer for General Electric so know a bit about turbine theory, and flow dynamics.

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