how much boost can you run
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how much boost can you run

  1. #1
    Senior Member nasty toys racing's Avatar
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    Default how much boost can you run

    how much boost can you run on pump gas 496 blown intercooled

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    Amber Racing Services BUSBY's Avatar
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    not much ... 8 psi?

    Depends on what pump gas (premimum I would suppose), altitude, heat, your blower, etc etc etc

    there are a lot of variables that go into that question ... almost too many to answer without a lot of information

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    Senior Member Green w Envy's Avatar
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    run pump gas with water meth injection get a bit more boost.





    Darin

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    Senior Member nasty toys racing's Avatar
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    1471 under driven 20% at 5 # rite now,i was told i could run 10 to 12 on pump gas as long as i had 20 to 25 pounds of water preshure in the block

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    Senior Member 2002CP19's Avatar
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    Quote Originally Posted by nasty toys racing View Post
    1471 under driven 20% at 5 # rite now,i was told i could run 10 to 12 on pump gas as long as i had 20 to 25 pounds of water preshure in the block
    Comp ratio?

    Forged internals?

    Are you data logging?

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    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by nasty toys racing View Post
    1471 under driven 20% at 5 # rite now,i was told i could run 10 to 12 on pump gas as long as i had 20 to 25 pounds of water preshure in the block
    I wouldn't go over 8# on pump gas ... you could up it if you ran a 50/50 blend with 110 octane, gives you a 100 low lead blend with burn control properties.

    Problem is that pump gas is such a poor performance fuel and is so inconsistent with engine temperature changes.

    Blower motors & pump gas are not a good combinations IMO ... especially with a blower the size of yours.

  9. #7
    FAT GUY IN A TPR STEALTH NO REGRET$'s Avatar
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    boost is not as important ..as your final compression ratio .

    your static com. + boost = your final...... an 8 to 1 motor with 8 pounds of boost = 12.4 final com. ..BDS AND OTHERS recommend that you keep the final to a maximum of 12.2 to 12.4 on pump gas. you can read everything on the BDS web sight.http://www.blowerdriveservice.com/faq.php
    Last edited by NO REGRET$; 06-25-2009 at 09:44 AM.
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    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by NO REGRET$ View Post
    boost is not as important ..as your final compression ratio .

    your static com. + boost = your final...... an 8 to 1 motor with 8 pounds of boost = 12.4 final com. ..BDS AND OTHERS recommend that you keep the final to a maximum of 12.2 to 12.4 on pump gas. you can read everything on the BDS web sight.http://www.blowerdriveservice.com/faq.php
    Darrin is right ... but there are too many other things that determine if pump gas is going to be okay. I would be more worried about the stability of the pump gas itself along with the temperature and altitude in which he's running.

    Bottom line, I wouldn't be getting after it with a 1471 and pump gas. I would keep the boost low.

    Much cheaper to run Av Gas (which I don't usually support either) or a blended pump/race gas instead of learning the hard way and hurting your engine from a bad tune up.

  11. #9
    Senior Member Tony Skagen's Avatar
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    598ci 9.3-1 comp 1471w/intercooler and water/meth injection I run 10psi of boost on pump gas 30*timing.

  12. #10
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by blown glass View Post
    598ci 9.3-1 comp 1471w/intercooler and water/meth injection I run 10psi of boost on pump gas 30*timing.
    you ever worry bout that water/meth tank goin dry? we put a methanol plate under the blow thru carb to hold off detonation alil more, runnin 16lbs on pump gas, or gonna try to anyways intake temps will be below 100* so it should be doable.gonna hobbs switch the methanol to turn on over 10psi, wether its running 16lbs or 30lbs.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member Tony Skagen's Avatar
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    I use a safe injection box from snowperformance that will trigger a retard box to pull timing if flow stops under boost.I have used this system on a few motors with very good out come!

  14. #12
    Senior Member TwinTurbo540's Avatar
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    Tom,

    blown Glass has one of the most bitchen set ups I have seen and really knows his shit!! That beast is making around 1200 on only 10psi and pump gas....!! pm him for a safe injection box and never worry about it going dry on ya!

    I will try and call you this weekend Tom!

    Travis

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    Senior Member TwinTurbo540's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    you ever worry bout that water/meth tank goin dry? we put a methanol plate under the blow thru carb to hold off detonation alil more, runnin 16lbs on pump gas, or gonna try to anyways intake temps will be below 100* so it should be doable.gonna hobbs switch the methanol to turn on over 10psi, wether its running 16lbs or 30lbs.
    If your intake charge temps stay below 100, 16 psi on 92 will be easy!!! I just love turbos......

    Travis

  16. #14
    Senior Member smitt19's Avatar
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    Default pump

    I've run 10 lbs on pump for some time now 8.5 intercooled checked 3 different times never saw any detonation, called boost power not log ago, they said there building there motors with 9.3 and running them on pump, cam will be a factor of course he was talking like 115-116 center line

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