Can bigger mufflers really add more than 10 ponies?

[Techie333]

well this egay auction here claims that itll add 12-20 ponies.................??

 

[Goldfish]

No.

 

[psteng19]

With just the exhaust, probably not.

With a full cat-back exhaust system, and headers, possibly 12 to the wheels...

... and with an intake

 

[Gyrene]

With a full cat-back exhaust system, and headers, possibly 12 to the wheels...

Maybe 12 to the crank. Don't expect to get much more than 5-7 dyno proven wheel-ponies unless you've done some serious work to the engine itself. (i.e. high-lift cams, monsterous air/fuel intake re-working, a nicely done T3/T4 hybrid turbo ) But you have to start somewhere, so if you plan an moderately/heavily modding your car, go for it. Otherwise don't waste your money.

 

[Electric Amish]

Originally posted by: psteng19
With just the exhaust, probably not.

With a full cat-back exhaust system, and headers, possibly 12 to the wheels...

... and with an intake

Don't forget the stickers.

amish

 

[Howard]

At most, 2-3, especially on a *economy* car.

While it may get rid of the stock reverse-flow muffler, you won't have much to pump out the end anyway.

 

[hoihtah]

it's all about efficiency and eliminating the bottleneck.

mufflers increase drag (reducing HP) to muffle the sound.
but it also creates a back pressure which is needed for the tuned engines to perform better.

so you give and take.
between the loss and the gain, you need to measure which is greater... and eliminate the bottleneck that way.

but to say that mufflers will add HP... flat out,
that's greatly misleading.

with that logic, no muffler is the best muffler.
but we know for fact that this is not the case.

you need to tune/match your engine to your muffler for the best result.

 

[NutBucket]

If you get a system properly designed for your application, then it will add something. Whether you'll actually notice what it adds (besides noise) is another issue. I bought a cat-back system for my car cause it was about the same price as gettin the muffler replaced. It looks better, sounds better, and if it gives me any power its a bonus. Now if I went and bought that header....

Nah, where's that turbo?

 

[StageLeft]

It depends on the car. Change out a component like that on a 1000 HP supercar and you'll see 20 hp. Do it on a camry and not a chance in hell.

 

[Gyrene]

Nah, where's that turbo?

Boosthead? Yea, forget all this bolt on crap and just get a Turbo (Make sure its a T3-T4 hybrid, lest you be the lucky bastard who drives a Supra TT)

 

[NutBucket]

Originally posted by: dtyn

Nah, where's that turbo?

Boosthead? Yea, forget all this bolt on crap and just get a Turbo (Make sure its a T3-T4 hybrid, lest you be the lucky bastard who drives a Supra TT)

No fear. Its gonna be on a Prelude motor in my Accord. The guy who's gonna do it is currently finishing up his sub 10 sec rear-engine, RWD CRX. Oh the joys of having friends!

 

[Gyrene]

Its gonna be on a Prelude motor in my Accord

*Drool*...if you're talkin the H22...mother help me. Those things have tons of potential (especially turbo'd ) I was gonna do a sick H22 swap into my Si, but I decided that the stock engine had potential if I rebuilt it.

 

[prodigy]

No

 

[ElFenix]

cat-back and intake on a v6 accord gets about 12 or 13 more according to some dyno chart in a mag i saw not too long ago. AEM intake, don't remember which exhaust system.

 

[Gyrene]

cat-back and intake on a v6 accord gets about 12 or 13 more according to some dyno chart in a mag i saw not too long ago. AEM intake, don't remember which exhaust system.

You can't trust dyno's lest they give you all the information. Could have been a dyno with no chassis, in which case its giving you crank power not wheel power.

 

[NutBucket]

Originally posted by: dtyn

Its gonna be on a Prelude motor in my Accord

*Drool*...if you're talkin the H22...mother help me. Those things have tons of potential (especially turbo'd ) I was gonna do a sick H22 swap into my Si, but I decided that the stock engine had potential if I rebuilt it.

That is indeed the plan

And for all the rice haters, my car is/will be completely stock on the outside except for rims and having been slightly lowered.

 

[Gyrene]

And for all the rice haters, my car is/will be completely stock on the outside except for rims and having been slightly lowered.

Screw that, you have a car that fast, I would rice it up, then when all the muscle-cars come up to you thinking you're an easy kill, blow them away and make them live with the fact that they got killed by rice . Nah, you're right keep it a sleeper.

 

[gregshin]

You gotta have the right engine mods and the piping for your exhaust SYSTEM to get more ponies. Its possible to get more then 10HP by adding a full exhaust pending on engine work.

 

[Talyn]

I've got a Dodge Spirit I've thought of ricing out a bit, any suggestions?

BTW, J/K

 

[Eli]

Originally posted by: hoihtah
it's all about efficiency and eliminating the bottleneck.

mufflers increase drag (reducing HP) to muffle the sound.
but it also creates a back pressure which is needed for the tuned engines to perform better.

so you give and take.
between the loss and the gain, you need to measure which is greater... and eliminate the bottleneck that way.

but to say that mufflers will add HP... flat out,
that's greatly misleading.

with that logic, no muffler is the best muffler.
but we know for fact that this is not the case.

you need to tune/match your engine to your muffler for the best result.

Umm... Wouldn't no muffler be the best?

Any restriction in the exhaust flow is going to decrease power... straight headers should be the best for any 4-cycle engine, as far as that goes. No?

We're not talking about 2-cycle engines here. What is there to tune in a 4-cycle exhaust system?

 

[Gyrene]

Umm... Wouldn't no muffler be the best muffler?

Hell no...no muffler means no backpressure, meaning no low-end torque, meaning what little econo-mobiles have disappears, meaning it takes forever to reach your powerban, meaning really slow, geo metro-type car. Less restrictive is good, full flow is bad.

 

[ElFenix]

Originally posted by: Eli

Originally posted by: hoihtah
it's all about efficiency and eliminating the bottleneck.

mufflers increase drag (reducing HP) to muffle the sound.
but it also creates a back pressure which is needed for the tuned engines to perform better.

so you give and take.
between the loss and the gain, you need to measure which is greater... and eliminate the bottleneck that way.

but to say that mufflers will add HP... flat out,
that's greatly misleading.

with that logic, no muffler is the best muffler.
but we know for fact that this is not the case.

you need to tune/match your engine to your muffler for the best result.

Umm... Wouldn't no muffler be the best?

Any restriction in the exhaust flow is going to decrease power... straight headers should be the best for any 4-cycle engine, as far as that goes. No?

We're not talking about 2-cycle engines here. What is there to tune in a 4-cycle exhaust system?

tuned works well for 2 cycle, but i think you're right, for 4 cycle running none is best. dragsters don't have much in the way of exhaust systems, and really thats just to route the flame and hot exhaust from the tires.

 

[Gyrene]

dragsters don't have much in the way of exhaust systems

Dragsters also idle where you redline, meaning they don't need low-end torque. Totally different than a street-legal car.

 

[Nocturnal]

Originally posted by: psteng19
With just the exhaust, probably not.

With a full cat-back exhaust system, and headers, possibly 12 to the wheels...

... and with an intake

exactly, no muffler will add that much.

 

[Eli]

Originally posted by: dtyn

Umm... Wouldn't no muffler be the best muffler?

Hell no...no muffler means no backpressure, meaning no low-end torque, meaning what little econo-mobiles have disappears, meaning it takes forever to reach your powerban, meaning really slow, geo metro-type car. Less restrictive is good, full flow is bad.

Umm... Why would backing the exhaust system up create low-end torque?

People... the better an engine can "breathe", the more power it delivers. That's the principal behind a two cycle engines tuned exhaust pipe. It uses sound waves to effectivly supercharge the combustion chamber.

I still say that straight headers would be the best, for any 4-cycle engine. Can someone give me some links? lol..

It doesen't make any sense. That's why they put 4 valves in the combustion chamber. That's why they make less restrictive intake systems. That's why they make less restrictive exhaust systems.

If your engine is breathing in more than it can expell, you will lose power.. period.