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Topic: Muffler flow tests and Exhaust theory (Read 28253 times) previous topic - next topic

Muffler flow tests and Exhaust theory

Reply #15
The 5.0 Mustang mag's sound tests for the Hooker Maximum Flow are pretty dead on....one of the quietest at idle and one of the loudest at WOT. ha.

Garrett H.
'94 F250 XLT- 4x4, 5 speed, 7.3 IDI Turbo Diesel, 4" intake, 4" exhaust, 5" turnout stacks, manual hubs, etc.
'87 Thunderbird Turbo Coupe
Engine, wheels, tires, etc!
Exhaust sound clip
Another clip

Muffler flow tests and Exhaust theory

Reply #16
A-HA!!!!!

http://www.broaderperformance.com/muffler%20flow%20test-A.htm
http://www.a-1performance.com/flow.htm

And perhaps the best article I can think of on this subject:  http://www.popularhotrodding.com/enginemasters/articles/hardcore/0505em_exh/index.html
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Muffler flow tests and Exhaust theory

Reply #17
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 puppies & 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.

Muffler flow tests and Exhaust theory

Reply #18
Quote
Flowmaster mufflers flow like puppies & 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.

Quote
2 ½” Inlet/Outlet Borla Turbo 373 CFM


I wonder if this is the standard or the XR-1.....

Quote
Most local exhaust places dont have a mandrel bender


I know a couple that do ;)
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Muffler flow tests and Exhaust theory

Reply #19
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.

Muffler flow tests and Exhaust theory

Reply #20
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!

Muffler flow tests and Exhaust theory

Reply #21
USED Raven mufflers they don't make them anymore but i promise you will have a one of kind mean sounding ride.

Next i would vote SLP Mufflers http://www.americanmuscle.com/slp-power-flo-mufflers.html
[SIGPIC][/SIGPIC]


http://www.cardomain.com/id/Carpimp1987
1987 T-Bird AEROBIRD-GT had many many mods but is now totaled and is the car that made me want to start customizing everything all over again.
1988 T-Bird 5.0 HO DD/Sleeper/next project car :birdsmily:
1988 Cougar XR7 5.0 HO Vortech Supercharged being bulit right now :cougarsmily:


Muffler flow tests and Exhaust theory

Reply #22
That post has ABSOLUTELY no technical input to add If you're going to post about a certain muffler, you could have found an independent test of it with technical data OR perhaps asked if anybody knew anything about it....Please stop post whoring, especially in a tech thread.....
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Muffler flow tests and Exhaust theory

Reply #23
I hear you - "this is my favorite muffler" is hardly helpful to this thread.

I'd be willing to delete all of my non-contributing posts in this thread (including this one) so it can be made into a sticky without to many BS posts.
11.96 @ 118 MPH old 306 KB; 428W coming soon.

Muffler flow tests and Exhaust theory

Reply #24
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.

Muffler flow tests and Exhaust theory

Reply #25
I use Flowtech Afterburners on mine. All they are is pipe into big hollow chamber and pipe out of big hollow chamber :hick:
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Muffler flow tests and Exhaust theory

Reply #26
Is there anyone who has a chart for these mufflers for the Turbo Coupe.

Muffler flow tests and Exhaust theory

Reply #27
Quote from: 88TurboCoupeman01;229965
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

Muffler flow tests and Exhaust theory

Reply #28
Well, I don't want Flowmasters anymore.... Thanks for helping me in my exhaust quest. Hmmm what to buy now?

Muffler flow tests and Exhaust theory

Reply #29
I have that exact set of Borla ProXS mufflers used in that test on my car right now.  I bought them for Anderson years ago. I'm quite happy with them. They are loud at WOT, but don't drone when cruising down the highway.
1988 Thunderbird
306 HO w/ A9P processor
AOD w/ Transgo Reprogrammer
Full Digital Dash w/ twin Cyberdyne A-pillar gauges 
245/50/16 Tires on Snowflakes
Engine swap - CA smog compliant