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Topic: back pressure question..
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75 chevy
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Member # 6717
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posted
 
 
I saw an '07 gt last night. He deleted the mufflers. Just straight pipes after the axle. I'm assuming he had factory cats.
So top end he had more power than me??
what do you guys think? mufflers are not necessary? ![[Confused]](confused.gif)
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2009 prius
1975 monza
Posts: 1917 | From: california | Registered: Apr 2006
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Jaejae5.0
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Member # 7958
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posted
IT DEPENDS WEITHER U HAVE A POLICE DEPARTMENT THAT ACT LIKE FAGETS...THERE NOT NECCESARY N REMOVING THEM MITE FREE UP SUM HORSEPOWER ISS JUS GON BE LOUDER...IT SOUNDS NICE ON SUM CAR N SUMTIMES IT DOESNT...
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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75 chevy
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Member # 6717
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posted
I thought w/o proper back pressure. The car might lose power?
In reality on the top end it had more power. I think.
Posts: 1917 | From: california | Registered: Apr 2006
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Thirteen Twenty
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Member # 7961
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posted
If he has factory cats then he has plenty of back pressure. I run my truck with just a cat and no muffler but the cats quiet it up so much that mufflers aren't necessary. Usually with cats the only thing a performance muffler does is change the tone deeper, not much in the way of quieting an exhaust. Not so much a matter of proper back pressure as just having some backpressure, the intention of mufflers and high flow cats is that they make power by reducing backpressure, if they were just louder but retained the factory backpressure then they would have no effect on HP.
Posts: 647 | From: union city | Registered: Oct 2007
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MAXPSI
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Member # 8093
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On the S197 version of the Mustang, people who removed the mufflers actually would lose some HP for whatever reason. Ford did a great job with the design of that particular muffler. All the after market mufflers are used to gain sound qualities mostly. The biggest gains with aftermarkets were 3-4 HP and some even lost HP.
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quote:
Just your average turbo'd Mustang 530 rwhp 550 rwtq
Posts: 120 | From: Chico, CA | Registered: Dec 2007
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75 chevy
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Member # 6717
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posted
lots of info. thanks guys. I was just curious.
I had flowmasters on mine. Now I'm running magna flows. Then I ran into this guy w/o mufflers. I was kinda trippin'.
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2009 prius
1975 monza
Posts: 1917 | From: california | Registered: Apr 2006
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BUKSING
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Member # 6594
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posted
check out slp loudmouths for s197's..they're basically muffler deletes.... it replaces the stock muffler with just straight pipe and tips.
ive heard an 06 gt w/o mufflers...didnt sound clean at all.
Posts: 1571 | From: 510 | Registered: Mar 2006
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75 chevy
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Member # 6717
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posted
yeah it sounded kinda weird. but it definitely got my attention.
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2009 prius
1975 monza
Posts: 1917 | From: california | Registered: Apr 2006
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porchstang
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Member # 7937
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posted
Mufflers tend to help more with lower RPM ie: torque. He passed you on the top end because since he didn't have any mufflers he was able to flow the exhaust better and there for produced more power up top. Back pressure has a lot to do with were you torque band begins and ends as well has horsepower.
Posts: 114 | From: Bakersfield | Registered: Oct 2007
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75 chevy
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Member # 6717
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posted
didn't pass me. til I hit the brakes.
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2009 prius
1975 monza
Posts: 1917 | From: california | Registered: Apr 2006
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SlowBird
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Member # 8106
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Back pressure is just an old myth. No car needs back pressure to make more torque or more horsepower. What a car needs is a certain amount of exhaust velocity to enhance the scavenging effect and thus make more power. This is the very reason why crush bent pipes hurt performance so much over mandrel bent pipes. Because the compression bends kill exhaust velocity, it also loses some horsepower. Obviously in addition to losing velocity, the crush bends also create more restriction, which of course causes a loss in power as well...
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96 TBird - PI Stuff
Posts: 31 | From: Sacramento | Registered: Dec 2007
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