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Thread: Boost Calculation

  1. #1
    Just spank it!!! Viper_ed's Avatar
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    Boost Calculation

    Anyone know of a forumla to ballpark boost numbers with pulley diameters for a Vortech V2 S-trim? Got a 6.87" crank pulley and a 3.47" S/C pulley on a 302.

  2. #2
    More RPM !!! Martin0660's Avatar
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    Quote Originally Posted by Viper_ed View Post
    ballpark
    <1 & >30 Big ballpark :D
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  3. #3
    Senior Member Rodeheaver's's Avatar
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    not real sure Ed, that sounds like a low boost configuration to me, i think the stock crank pulley for that kit is a 6" and a 3.33 blower pulley and they only make 8-10lbs usually.. And I cant remember were to find a calculator!?!?
    2015 A6 Mustang GT that so far has gone 9.48@147 but still the fastest prochargerd S550 in the world aside from Tim Essick's!
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  4. #4
    Just spank it!!! Viper_ed's Avatar
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    Yep, Vortech just confirmed on the phone that the base kit has a 6.87 Crank and a 3.33 S/C pulley. I need to figure out what combo will put it around 14-16 psi on a 302 w/ H/C/I.

  5. #5
    Not Bad for 367 SAE RWHP Pure Stock's Avatar
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    6-7 lbs. with that combo.
    2011 Mustang GT, MT-82, 3.73's :

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  6. #6
    Tripedalist yeahloh95's Avatar
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    do you have a power pipe that is worth another 2 lbs on the stock pulley combo and whats this n/a guy doing repling? lol
    Troy
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    Pinks All Out #189 349Stroker's Avatar
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    Quote Originally Posted by Viper_ed View Post
    Yep, Vortech just confirmed on the phone that the base kit has a 6.87 Crank and a 3.33 S/C pulley. I need to figure out what combo will put it around 14-16 psi on a 302 w/ H/C/I.

    made 15-16 with a 2.96/6.87 and powerpipe
    88 GT...and some boost

  8. #8
    Senior Member wick's Avatar
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    That combo will give you about 7 or 8 psi. Get a 2.90. That will get you closer to 14. Or get an 8" lower from ASP (arts parts)
    Rob
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  9. #9
    Quote Originally Posted by yeahloh95 View Post
    and whats this n/a guy doing repling? lol
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  10. #10
    Got Boost?
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    With My GT40s, 6.87 crank, 2.95 blower, and AFM powerpipe mine made 15 psi Ed.
    2013 Race Red F-150 Screw FX4 Ecoboost

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  11. #11
    Not Bad for 367 SAE RWHP Pure Stock's Avatar
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    Quote Originally Posted by yeahloh95 View Post
    do you have a power pipe that is worth another 2 lbs on the stock pulley combo and whats this n/a guy doing repling? lol
    Natural aspiration is like Viagra, it's for those who can't get it up UN-naturally
    2011 Mustang GT, MT-82, 3.73's :

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  12. #12
    Senior Member wick's Avatar
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    Quote Originally Posted by Rio94gt View Post
    With My GT40s, 6.87 crank, 2.95 blower, and AFM powerpipe mine made 15 psi Ed.
    All combos are different. Just goes to show how better heads will do. Boost is "restriction" basically. With my 6.87 and 2.90 I am only seeing 13.?. Its all different. Mind you, my intake is ported and the heads mate to a 1262 gasket. Its all different.
    Rob
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  13. #13
    Got Boost?
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    Exactly.

    Ill be spinning that S-trim with all its might to feed my 408W haha.
    2013 Race Red F-150 Screw FX4 Ecoboost

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  14. #14
    Senior Member wick's Avatar
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    Put the belt right on the shaft!!!!1 HAHAHHAHAHAHAH
    Rob
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  15. #15
    Big Daddy gmkillr's Avatar
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    "Boost" is a measurement of backpressure.
    Corvette Z06

    Growing up.............Not everyone does it!


  16. #16
    Senior Member wick's Avatar
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    Quote Originally Posted by wick View Post
    All combos are different. Just goes to show how better heads will do. Boost is "restriction" basically. With my 6.87 and 2.90 I am only seeing 13.?. Its all different. Mind you, my intake is ported and the heads mate to a 1262 gasket. Its all different.
    Quote Originally Posted by gmkillr View Post
    "Boost" is a measurement of backpressure.
    Like I said here. Restriction.
    Rob
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  17. #17
    Just spank it!!! Viper_ed's Avatar
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    Quote Originally Posted by yeahloh95 View Post
    do you have a power pipe that is worth another 2 lbs on the stock pulley combo
    Yes Troy, there is a AFM Power Pipe with this setup as well.

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