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PSI with different pulley combo question...

Discussion in '2013-14 Shelby GT500' started by scottGT500, Jun 13, 2014.

  1. scottGT500

    scottGT500 Active Member Established Member

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    Current mods are Revan Racing 13-6 (cai, 65 mm TB, 2.4" upper, Lund tune)...93 octane only.

    I am adding 1 7/8 Headers using the o/r mid pipe, so what would be the approx PSI with the headers...

    10% + 2.4" = ?
    10% + 2.5" = ?
    10% + 2.6" = ?

    Thanks!!
     
  2. BOSSPOWER

    BOSSPOWER Active Member Established Member

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    10% + 2.4" = 17-18 psi
     
  3. VFORCEJOHN

    VFORCEJOHN New Member Established Member

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    I'm seeing 18-19 with just a 10% lower according to the oem dash gauge. colder days it'll touch on 20 psi under hard accel.

    How accurate this is??? never checked.
     
  4. BOSSPOWER

    BOSSPOWER Active Member Established Member

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    From my tuner and AeroForce they have both told me the factory boost gauge is not very precise. The boost that I expressed that I saw was what I got from my dyno reading.

    Manuel
     
  5. scottGT500

    scottGT500 Active Member Established Member

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    How much difference are we talking about between the OEM guage and "actual" PSI?

    Thanks!!
     

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