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408 low dyno numbers

 
Old 09-24-2018, 10:39 PM
  #21  
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Originally Posted by 98CayenneT/A View Post
Since this was bumped I will just say that with most y pipes people don't realize that the outlet drops down to 2.5 in. inside diameter. If you are going to run a y pipe ditch that junk and put a 4in. flow master merger in there followed by a 4in. Cutout.
Shitty y pipe outlet

I




    Last edited by handyandy496; 09-24-2018 at 10:57 PM.
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    Old 09-24-2018, 10:59 PM
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    Old 10-01-2018, 01:04 PM
      #23  
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    Originally Posted by SAPPER View Post
    Getting into the specs of the engine...Who, exactly figured up your CR?
    A 10cc dish will not yield a 11.1 CR unless you have very,very small chambers. Based on a general thought of builds I've been associated with (used to be the bottom end machinist)
    that combo would be around 10:1, give or take a few tenths.

    Have a good engine build pro take a better look at your exact components and see what it really has.
    from crank to piston, gaskets, true chamber size, etc.
    You may have a setup ready for some boost.

    11 top 1 with stock gaskets
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    Old 10-01-2018, 02:05 PM
      #24  
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    I made 463rwhp on a Mustang Dyno through a Borla Muffler and 91 Octane. Based on engine specs I believe I'm at around 10:9 Compression, I get a lot of crap that my 408 is weak and numbers sucks but it runs pretty good as an overall combination and pulls to redline smoothly.

    Agree with some that have asked how does it feel? How does it run outside of numbers on a paper? This is overall what matters if numbers matter slap a turbo on it lol.

    Here's a run down of the motor/drivetrain:
    Heads - AFR Mongoose 230cc / 62cc
    Head Gaskets - .050 Cometic
    Injectors - 60# FAST
    Intake - FAST 102MM
    Throttle Body - NW 102MM
    Block - LQ9 4.03"
    Cam - Comp 243/251, .624/.624, 111+1 LSA, 110 ISL
    Crank - Lunati 4.00" Stroke
    Pistons - JE Pistons, 12cc
    Rods - Lunati 6.125" H-Beam

    Exhaust - Cutout - QTP Electric
    Exhaust - Headers - TSP 1 7/8" Stainless
    Exhaust - Muffler - Borla ProXS
    Exhaust - Y-Pipe - TSP 3" Stainless

    Driveshaft - Mark Williams Accu-Bond 3 1/2" Aluminum
    Converter - Yank 3600
    Rear - 3.73 - 12-Bolt
    Transmission - 4L60E, Built Finish Line Level 5
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    Old 10-01-2018, 02:07 PM
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