FRPP heads, PI Heads, Non PI head rwhp hp tests.

Discussion in '96-04 - 2V Specific' started by caseypayne69, Jul 31, 2006.

  1. caseypayne69

    caseypayne69 Active Member

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    I found this thread, that had an artlice from fast fords mag. It showed the three head choses with bolt on GT's. And some air flow numbers.

    http://www.allfordmustangs.com/forums/showthread.php?t=29892&page=3

    Stock Non-PI motor: 237.4hp, 318.9tq
    FRPP Heads & E46 Intake: 314.3hp, 344.3tq
    PI Heads, Intake, Cams: 291.2hp, 334.7tq
    Ported non-PI heads, PI intake, Livernois cams: 335.8hp, 335.2tq
    Ported PI heads, PI intake, Livernois cams: 351.6hp, 340.4tq

    Also showed how Ported PI heads barely flow more then stadard FRPP heads.
     
  2. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    yeah i remember that article...

    The SVO when ported correct are just mean nasty!

    The ported PI's/NPI's in that test didn't inpress me. Take them to MPH or Renegade Racing and they can be made to flow 245-250 cfm in race port easily but the Svo's can be made to flow 280cfm!

    If i had it all to do all over again i would have went with the SVO heads instead of my P&P'd PI heads.
     
  3. american_muscle79

    american_muscle79 New Member

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    Stock Non-PI motor: 237.4hp, 318.9tq.................where does that number come from?
     
  4. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    engine dyno....engines out of car so it has not loss of power through drivetrain.
     
  5. american_muscle79

    american_muscle79 New Member

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    ohh ok....so why do that classifly the stock non pi's at 225 hp?.....y not the 237
     
  6. caseypayne69

    caseypayne69 Active Member

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    I hadn't seen the article but cars are supposed to be rated at the flywheel horse power with all accessories included. Stock a 98 GT with 225 flywheel horsepower is rated around 180 to 190 rwhp. Which do you think sells the car? I assumed that test was done with bolt on's. I believe those numbers are from rwhp. not Flywheel. With full bolt on's. But thats just my guess.
     
  7. american_muscle79

    american_muscle79 New Member

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    yea i was gunan say....that makes more sence
     
  8. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    good info CasyePain

    These engine numbers there's no exhaust resistance from cats or mufflers.

    Since this is engine HP - times it by .75 to give you RWHP. (drivetrain loss)
    it's .77 for a manual trans, but since this is an engine dyno with no emissions, .75 is pretty close.

    I'd bet newer cam grinds will give you better numbers.

    My car got 263 HP and 277 TQ 4 years ago, power heads ported PI's and mild cams.
    5200 ft elevation, auto, average tune.
    That's approx 350 HP 369 tq at the flywheel.
    Cool!

    The guys getting 330 rwhp with better cams and tune on ported PI's- that's 440 at the flywheel.
     
  9. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    the engine dyno is also run without accessories which rob HP and usually an electric water pump. So the engine dyno is usually the max #s (gross) the engine can produce.

    Ford factors in engine accesory loss then gives the gross HP rating.
     
  10. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    You mean they give you realistic numbers??? That's just crazy!!
     
  11. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    well in the case of our limp wristed GT's yes....but those 94/95 Cobra -03/04 Cobra and supposedly the GT500 were all under rated. Now thats a good problem to have. I wish our pathetic stock #'s were wrong :(
     
  12. jgsmuzzy

    jgsmuzzy New Member

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    They had to after the 2000 Cobra fiasco when they got sued for overstating the hp figures
     
  13. Naptown_Stang

    Naptown_Stang Active Member

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    Car Craft Magazine also just recently did a article on how "the mod motor rocks" similar to this.
     
  14. duff daddy

    duff daddy Legend

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    4 years old, digging it up...really???
     
  15. rick focks

    rick focks Legend

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    shit man, i'm glad, thank you...

    this is work, Krout should be doing
     
  16. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    haha sometimes these old threads have some good info in them.
     
  17. rick focks

    rick focks Legend

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    man... if i could get my hands on some svos!!!

    i've got a lead on some pis so cheap i'll have chave to get a p/p
     
  18. 98GTnSC

    98GTnSC Well-Known Member

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    anyone have a link to some good sites that have these SVO heads? thanks
     
  19. rick focks

    rick focks Legend

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    They don't make them anymore. Gotta hustle some up..
     
  20. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    Only place I ever see them is on corral.net in the classifieds and they usually are overpriced.

    The racers will snatch them up quickly because when ported properly can flow like 250-280cfm and they won't get a weight penalty running them like the Trick Flows.

    I would buy the Trick Flows if I was looking for new heads :)