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  1. #1

    Default 350 back pressure requirments

    does anyone have info on the required min back pressure for a stock 94 350 tbi engine at idle while still maintaining proper engine operation. (ie no back fire or valve flash)
    94 sub 6inch lift 34inch bfg mt. massive rework project soon. the audio system hit 150.3db so now its time to rebuild and try for 155db. mudpuppy is also getting a new engine, rebuilt ifs, dual 500amp 15.1vdc alts, 5 5,000amp batts, ant the combined wattage with the new system should be close to 15,000watts. this is going to be a wild ride boy and girls.

  2. #2
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    stephan's Avatar
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    There's no minimun back pressure Mudpup. All that changing your back pressure does, is moves your peak torque up & down in your RPM range.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  3. #3
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    murdog94's Avatar
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    However with that much truck i would at least keep the cats in place. since you need all of your power down low and the more open the exuast the higher in the rpms the power is.. And the more open the worse your milage gets.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

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