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Thread: Engine upgrades

  1. #1
    Join Date
    Jun 2017
    Location
    Sweden
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    63

    Engine upgrades

    What are the most "bang for bucks" if You're looking for more easy horse power?

  2. #2
    Join Date
    Feb 2003
    Location
    Tinton Falls, NJ
    Posts
    1,691
    Best bang for the buck is a ported 94/95 blower.

  3. #3
    Join Date
    Jun 2017
    Location
    Sweden
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    63
    What would the gain be?

  4. #4
    Join Date
    Jun 2002
    Location
    Orem, UT
    Posts
    5,908
    What are you starting with? What year is your car? Is it stock?

  5. #5
    Join Date
    Jun 2017
    Location
    Sweden
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    63
    A completely stock 91, manual

  6. #6
    Join Date
    Nov 2012
    Location
    Canton, GA
    Posts
    441
    I read an article from the Supercoupe Club of Iowa, but it was taken down. Iíll write what I remember/what Iíve heard over the years. Please correct me if I made a mistake.

    Remove your air silencer. Tiny HP gain, but its free. Located under your airfilter, youíll probably need to jack the car up, remove the front-passenger-side tire and passenger-side plastic inner fender to reach it. Just buy 3 replacement bolts, nuts, and washers to hold your air filter box down. You might also get a nicer K&N airfilter while at it.
    If you want a cone-shaped air filter, youíll want a heat shield for it so you dont end up with a hot air intake. Probably need to fabricate your own heat shield unless someone has one for sale.

    Maybe getting a 10% OD pulley for your Supercharger or Jackshaft (accomplishes the same thing, but the OD JS pulley is more desirable because it probably wont have as much belt slip as the smaller OD SC pulley).

    Some people insist a more free-flowing exhaust upgrade helps, but havenít gone for it myself. Seems expensive, but is probably necessary if you are serious about performance. Go with stainless.

    If you do a bunch of engine and Supercharger upgrades, youíll probably want a Front Mount Intercooler. Magnum Performance made some a long time ago, but they can be hard to find. Double Intercoolers help, but arenít as helpful as Front Mount Intercoolers.

    Probably the cheapest way to get the most HP is to drop in a 5.0 V8 engine from a donor car

    I shared basically all that I think I know. My 1990, 1991, and 1993 SCs are all basically stock (except for the OD JS pulley and removing the air silencer). So Iíd love to see what other members have to say. Iím willing to spend a few bucks on some modest HP gains.

    Any opinions here on Seafoam in our cars? Cuzz Iíve heard good things about it. Might squeeze a few more ponies out.

  7. #7
    Join Date
    Apr 2002
    Location
    St. Charles, MO
    Posts
    21,173
    All sounds okay except the part about installing a 5.0 motor. Unless you are doing a power adder with the engine swap it will be slower than the SC motor.
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  8. #8
    Join Date
    Jun 2002
    Location
    Blair, Nebr
    Posts
    3,302
    "Measureable" gains? Open up the exhaust, overdrive the blower, and do an intercooler upgrade. No, I don't have real world HP gains.

    Seat of the pants? Gears and shift kit if you have an auto.

    Whats your goal with the car? A cruiser that's a bit more fun? Or drag strip monster? And then decide a budget.

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