Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 25

Thread: Muffler flow tests and Exhaust theory

  1. #11
    Join Date
    Oct 2004
    Location
    Farmingdale, NY
    Posts
    9,092
    Feedback Score
    18 (100%)

    Default

    -- 05 Mustang GT-Whipplecharged !! -- 87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's! http://www.fquick.com/V8Demon

  2. #12
    Join Date
    Nov 2004
    Location
    So. NH
    Posts
    2,014
    Feedback Score
    1 (100%)

    Default

    The two lists use a differerent water drop 15" versus 20.3" - too bad it makes comparision difficult. The one obvious thing here (and this has been proven out at dragstrips), Flowmaster mufflers flow like crap & cost HP.

    Here is a more complete list of the first flow rates you listed. Note the Magnaflow don't flow as you might expect for a stragiht-through - but I'll take a HP test on an actual car anyday as the final arbiter.

    All tests via an independent lab
    All tests @ 15” wc

    2 “ Straight Pipe 283 CFM
    2 ¼ “ Straight Pipe 365 CFM
    2 ½ “ Straight Pipe 521 CFM

    2 ¼” Typical Bent tailpipe 268 CFM
    2 ½” Typical Bent Tailpipe 417 CFM

    2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
    2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
    Same as above set for reverse flow 141 CFM
    2 ¼” Cherry Bomb 239 CFM
    2 ½” Cherry Bomb 294 CFM

    2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
    2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
    2 ½” Inlet/Outlet Gibson Superflow 267 CFM
    2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
    2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
    2 ¼” Inlet/Outlet Thrush CVX 260 CFM
    2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
    2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
    2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
    2 ½” Inlet/Outlet Borla Turbo 373 CFM
    2 1/2" Inlet/Outlet Magnaflow 284 CFM


    Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
    Standard OEM 2 ½” Inlet/Outlet 161-197 CFM

    The madrel bending of the pipes done by aftermarket exhaust companies is good for 2-4 h.p. depending on the severity of the stock bends. Most local exhaust places dont have a mandrel bender so changing the pipes out doesnt do anything if pipe size it not increased.
    11.96 @ 118 MPH old 306 KB; 428W coming soon.

  3. #13
    Join Date
    Oct 2004
    Location
    Farmingdale, NY
    Posts
    9,092
    Feedback Score
    18 (100%)

    Default

    Flowmaster mufflers flow like crap & cost HP.
    And this along with the fact they turn into solid rust in 6 months is why I have not and never will run them on a vehicle.

    2 ½” Inlet/Outlet Borla Turbo 373 CFM
    I wonder if this is the standard or the XR-1.....

    Most local exhaust places dont have a mandrel bender
    I know a couple that do
    Last edited by V8Demon; 04-22-2008 at 12:00 AM.
    -- 05 Mustang GT-Whipplecharged !! -- 87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's! http://www.fquick.com/V8Demon

  4. #14
    Join Date
    Oct 2004
    Location
    Gap Mills WV 24941
    Posts
    14,501
    Feedback Score
    15 (100%)

    Default

    i gotta feeling this thread might get lost.

    can conclusions be consolidated to one post so i can add it to my diy link?

    also,,, i agree,
    I would also like to see flow numbers on a bench with little or no pipe.

  5. #15
    Join Date
    Oct 2004
    Location
    Farmingdale, NY
    Posts
    9,092
    Feedback Score
    18 (100%)

    Default

    In super simplified terms:
    Velocity and scavenging=Good.
    Backpressure=Bad
    Flowmasters=Suck


    The muffler in an exhaust system can be used just like exhaust pipe to extend the collector and add to wave pressure tuning.
    -- 05 Mustang GT-Whipplecharged !! -- 87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's! http://www.fquick.com/V8Demon

  6. #16
    Join Date
    Nov 2004
    Location
    So. NH
    Posts
    2,014
    Feedback Score
    1 (100%)

    Default

    OK, check out this thread -> Flowmaster JUNK mufflers

    ...makes me glad I chose the 18" Magnaflow - BigJoe said they made more power than the 14" magnaflow and a lot more than ClogMasters.

    Glad this got sticky status too!
    11.96 @ 118 MPH old 306 KB; 428W coming soon.

  7. #17
    Join Date
    Jun 2005
    Location
    Chicago
    Posts
    10,801
    Feedback Score
    17 (100%)

    Default

    I use Flowtech Afterburners on mine. All they are is pipe into big hollow chamber and pipe out of big hollow chamber
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

  8. #18
    88TurboCoupeman01 Guest

    Default

    Is there anyone who has a chart for these mufflers for the Turbo Coupe.

  9. #19
    Join Date
    Oct 2004
    Location
    Indpls, IN
    Posts
    8,110
    Feedback Score
    34 (100%)

    Default

    Quote Originally Posted by 88TurboCoupeman01 View Post
    Is there anyone who has a chart for these mufflers for the Turbo Coupe.
    If you can't see through the muffler...it doesn't belong on a TC.
    Long live the 4-eyes! - '83 Tbird Turbo

  10. #20
    Join Date
    Apr 2008
    Location
    Tripoli, Iowa
    Posts
    2,435
    Feedback Score
    0

    Default

    Well, I don't want Flowmasters anymore.... Thanks for helping me in my exhaust quest. Hmmm what to buy now?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •