Supercharging A 331

Discussion in 'Fox 5.0 Mustang Tech' started by smkshw, Jan 23, 2014.


  1. smkshw

    smkshw Active Member

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    just built a 331 stroker last summer it did ok....356rwhp....but im thinking of supercharging it now with a paxton 5-6psi...i have some extra cash so thats not a problem.....anyone have any idea what gains id get with it to wheels with a good tune?....says 5ohp on stock motor?
  2. smkshw

    smkshw Active Member

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    its 10-1 thats why the low boost...
  3. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    you can go higher with the boost of you have the proper fuel system and a good tune. No reason you sholdn't hit 450 -475 with 8-10 psi, 425 with 5-6 is my guess
  4. smkshw

    smkshw Active Member

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    ya...actually talked to a tuner today and he said the same thing....didnt think i can go that high...if i can hit 450 plus to the wheels id be very happy...!
  5. Onefine88

    Onefine88 Previously 89SSC18

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    I bet along with that impressive N/A 356rwhp your seeing some nice torque numbers too on the 331.

    I've always heard that 15rwhp per pound of boost is a good estimate. In that case 5-6psi from the Paxton would yield 75-90 rwhp. So your 450rwhp goal should be easy to achieve, especially with that 331.
    If you install a methanol injection kit as well you'll probably see 475 easy with gobs of torque to boot!

    I have a Mr. Freeze meth kit from AFM. Just love that little thing!:nice:
  6. smkshw

    smkshw Active Member

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    i was more than happy with it last summer but you know how it is...lol....always want more!..... im going to talk to the tuner and see what size injectors to get and i guess a different maf also.... than im going to order this weekend...
  7. smkshw

    smkshw Active Member

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    of coarse the tuners not there today.....what you guys think,i have 32 injectors ill need 42 im sure right?
  8. MikeH686

    MikeH686 Mine is only two inches though.

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    Go sixties the tuner can always dial the duty cycle back on them.
  9. smkshw

    smkshw Active Member

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    shoulda done that in the first place!....thought i was done though...lol....u have an opinion on maf for my set up?....thanks by the way...
  10. Onefine88

    Onefine88 Previously 89SSC18

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    I run 60's with a 80mm ProM Maf . If you're not already, you will need to tune with a chip to run the 60's.
  11. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Hpx slot maf and 60's here
  12. smkshw

    smkshw Active Member

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    thanks guys ended up ordering the paxton 1220sl 60 injectors and the tuner said to get the pro-m 90mm?...so far i only found it on the pro-m site.. they asked me what size inlet tube am i running?...not sure what the kit comes with but tuner also said to get the anderson ford power pipe?...anyone know what size that is?...thanks again...
    Last edited: Jan 25, 2014
  13. tonydalrymple

    tonydalrymple Active Member

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  14. RangerJoe

    RangerJoe Advanced Member

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    Just curious, what is your N/A combo consist of?

    Joe
  15. smkshw

    smkshw Active Member

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    rpm2 intake
    comp xe274hr cam
    75 bbk throttle body
    76 bbk maf
    afr 185
    long tubes
    and all the supporting stuff
  16. smkshw

    smkshw Active Member

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    and paxton on the way!....dont know if i can handle the suspence!
  17. MikeH686

    MikeH686 Mine is only two inches though.

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    Talk to rick at rnh he gave me the best deal on my 80 prom maf and he can answer all the questions you have
  18. smkshw

    smkshw Active Member

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    thanks.... but found a guy out here thats helping me out,very helpful....was talking intercooler but thats to pricey,just build motor last summer.....im going to run a water/methanal kit....new to me,dont know to much about how it works but he recommended it for my set up....gona have to do some reading how to install it....he says i should be good for 450whp plus?....wich ill be happy with
  19. smkshw

    smkshw Active Member

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    hey bud?....so im not cheaping out here with the meth kit?....is it fine for street strip use?....going to find out more about it tonight...thanks
  20. Onefine88

    Onefine88 Previously 89SSC18

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    I highly recommend a methanol kit. Methanol injection is Great for boosted cars. Perfect for street and strip.There are 2-3 brands out there but like I mentioned above, I'm using a Mr.Freeze kit from Anderson Ford. They are no longer available but you can find one used if you look around. You can pick one up for around $100 used.

    I have my nozzle tapped into the power pipe elbow (pre-blower) blowing directly into head unit. The impeller atomizes it and its forced into the intake already mixed with the air. Makes for really cold intake air temps. The Methanol/water injection converts 93 octane fuel into 116-118 octane.

    With real cold intake air temps combined with high octane fuel, you can add more timing and boost. Hense making more power.
    It is a requirement to be custom tuned on a dyno to take advantage of a meth kit.
    A5literMan likes this.

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