FlowMasters....how do they work???
I just finished watch 2 Guys Garage and they were talking about exhaust systems. One of the things they mentioned was how to get max hp. One way to do that is to get the exhaust out of the cylinder as fast as you can. Heartthrob or Cherry Bomb exhaust has a flow-thru system which allows for min backpressure thus getting the exhaust out of the cylinder faster. That being said, how does FlowMasters work? With the way their mufflers are designed, there seems like there would be a lot of back pressure. I can see how a glass pack or flow-thru muffler would do the job....so how does a FlowMaster work? I have the 40 Series on my Vette and love it....this is more of a curiosity question....:thumbs:
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Originally Posted by vetteguy75
(Post 1574056015)
I just finished watch 2 Guys Garage and they were talking about exhaust systems. One of the things they mentioned was how to get max hp. One way to do that is to get the exhaust out of the cylinder as fast as you can. Heartthrob or Cherry Bomb exhaust has a flow-thru system which allows for min backpressure thus getting the exhaust out of the cylinder faster. That being said, how does FlowMasters work? With the way their mufflers are designed, there seems like there would be a lot of back pressure. I can see how a glass pack or flow-thru muffler would do the job....so how does a FlowMaster work? I have the 40 Series on my Vette and love it....this is more of a curiosity question....:thumbs:
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Why would they have more back pressure? Are you talking about a Flowmaster that has something in it besides a couple baffles? The perforated tubes in a glass-pack muffler are moving a significant amount of gas through those holes or else they wouldn't be any quieter than straight pipes. The gas that goes into the fiberglass section is going to slow down greatly and when it pops back into the tube, will do a lot to disrupt the flow. The Flowmasters on the other hand will have some turbulence of course but not nearly as much. There may be a baffle right "in the way" of the exhaust flow but on the whole it will flow through in a fairly cohesive way. As far as the acoustics of removing the sound, I'm less up on that. Their website probably has some technical stuff amongst the marketing spin.
I've had the 50's and now have the 40's. Granted there's a 250HP difference between the engines but the 40's are quite loud (in a good way ;) ), the 50 Deltaflows had a great sound on my 350 with ~270HP. |
Have the flowmasters on my '71, They sure sound good if nothing else.They do flow much better than any stock muffler, can't see putting glasspacs on a vette.
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Just select the correct pipe and muffler size for your engine's performance. Flowmasters [or any other decent brand of muffler] will not overly restrict exhaust flow, if they are properly sized. The "2 Guys Garage" show is just selling "stuff" for their sponsors; disregard any recommendations that they make on the show. The "How To" portion of the show is fine.
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Originally Posted by 7T1vette
(Post 1574058555)
Just select the correct pipe and muffler size for your engine's performance. Flowmasters [or any other decent brand of muffler] will not overly restrict exhaust flow, if they are properly sized. The "2 Guys Garage" show is just selling "stuff" for their sponsors; disregard any recommendations that they make on the show. The "How To" portion of the show is fine.
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Flowmasters dont flow that great,sorry if its a let down,but they do sound good and i do like the sound of them,but compared to staight through designs,flowmaster doesnt compare.:( there has been alot a research on here about this subject,do a search.also on one study i read on here was that between all mufflers there was like only 5 to 10 hp difference between them.I wouldnt worry about it.
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Originally Posted by Billysvette
(Post 1574063459)
Flowmasters dont flow that great,sorry if its a let down,but they do sound good and i do like the sound of them,but compared to staight through designs,flowmaster doesnt compare.:( there has been alot a research on here about this subject,do a search.also on one study i read on here was that between all mufflers there was like only 5 to 10 hp difference between them.I wouldnt worry about it.
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Originally Posted by Billysvette
(Post 1574063459)
Flowmasters dont flow that great,sorry if its a let down,but they do sound good and i do like the sound of them,but compared to staight through designs,flowmaster doesnt compare.:( there has been alot a research on here about this subject,do a search.also on one study i read on here was that between all mufflers there was like only 5 to 10 hp difference between them.I wouldnt worry about it.
I still love the way those Flowmaster mufflers sound. I have some Magnaflows that are going on my '78 Z28, and I'm also planning on going the same route with the Vette:thumbs:. There's nothing wrong with Flowmaster mufflers, you just have to choose the right ones that are right for you:thumbs::cheers:. |
so, who has the best muffler? Just curious.
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Originally Posted by eagle275
(Post 1574078480)
so, who has the best muffler? Just curious.
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Originally Posted by Billysvette
(Post 1574079244)
Any straight through muffler will flow good.take your pick.:cheers:
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Huh , what did you say ??? The 82 I just bought has new Flowmasters and they will wake the dead. I absolutely hate the way they sound except at idle.
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Hooker Aerochamber
Try these....they have a "similiar" sound to flowmasters....but flow like a straight thru.... They don't have that glassy, crackely, raspy sound that all of the straight thru/glass packed mufflers have...(ie. Magnas, Ultraflows, etc...) http://img.photobucket.com/albums/v2...t/DSC00557.jpg http://img.photobucket.com/albums/v2...t/DSC00558.jpg http://img.photobucket.com/albums/v2...t/DSC00559.jpg http://img.photobucket.com/albums/v2...h_MOV00592.jpg Just throwing that out there for someone wanting a good sound and minimal power loss... |
Originally Posted by ...Roger...
(Post 1574081211)
Huh , what did you say ??? The 82 I just bought has new Flowmasters and they will wake the dead. I absolutely hate the way they sound except at idle.
Personally, i dont run them, too much drone. |
thanks!
Originally Posted by Billysvette
(Post 1574079244)
Any straight through muffler will flow good.take your pick.:cheers:
:thumbs: |
Many have probably seen this:
Muffler, Air Flow, DB at 3500 RPM Hooker Aero 73% 98 Flowmaster 40 59% 100 Flowmaster 50 53% 98 Dynomax Ultra 99% 91 Dynomax Turbo14" 70% 93 Dynomax Turbo20" 70% 88 I can't determine the authenticity. |
From elseware on the forum, but worth reposting. Flow of various mufflers, measured in CFM:
OEM..................................... ........................................ ...225 Gibson SuperFlow 788200.................................. ............311 TTS Bullet Cat Converter............................... ..................324 Flowmaster 40 series 42540................................... .......352 Flowmaster 50 Series.................................. ...................362 Flowmaster 40 series 43040................................... .......392 Dynomax Super Turbo................................... .................410 Flowmaster 62631................................... .......................435 Carsound Cat Converter............................... ..................436 FLP Cat Converter............................... ............................440 Edelbrock Victor 5535.................................... ..................562 Flowmaster 40 series 435409.................................. ........576 Edelbrock RPM series 5511.................................... ..........579 Flowmaster Delta Force Racing 54040-10........................634 Edelbrock 304 series 5560.................................... ...........640 Edelbrock Gen App 5505.................................... ..............708 Dynomax Race Magnum Welded 17216...........................711 Borla XR-1 40600................................... ..........................836 Borla XR-1 40615................................... ..........................854 Dynomax UltraFlow SS 17263................................... .......1000 Dynomax Race Magnum Welded 17218...........................1000 Borla XR-1 40575................................... ..........................1100 Dynomax UltraFlow............................... ...........................1133 Edelbrock Victor 5537.................................... ..................1400 Borla XR-1 40450................................... ..........................1400 Borla XR-1 40741................................... ..........................1450 Dynomax UltraFlow SS 17296, 17268..............................2200 Dynomax Race Magnum Welded 17220, 17224...............2200 Dynomax Race Magnum Welded 17225...........................2600 The formula for required exhaust flow is: horsepower times 2.2. Pretty simple eh? So if your car makes 400 hp, you will need a total of 880 cfm muffler capacity for an unrestrictive exhaust system. So for dual exhaust, you would need mufflers that flow 440 cfm. For reference, a 2.5 inch diameter pipe flows ~500 cfm. Adding non-mandrel bends will lessen that amount. |
Why is dynomax ultra flow mufflers different in cfm,one is stainless steel and the other is regular steel,same muffler but made of different material,should be the same.
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Originally Posted by Billysvette
(Post 1574099410)
Why is dynomax ultra flow mufflers different in cfm,one is stainless steel and the other is regular steel,same muffler but made of different material,should be the same.
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Originally Posted by Bugman Jeff
(Post 1574105030)
Note that the part numbers (where listed) are different. Different designs and diameters of mufflers. Has nothing to do with the material, just the shape/size of the muffler. For instance, the 17263 UltraFlow is a 2 1/2" pipe with an oval case, the 17296 UltraFlow is 3" with a round case
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Originally Posted by Billysvette
(Post 1574081828)
It may not be pleasing to you ,but those people that hear you go by sure have a smile on their faces:D Flowmasters drone bad inside the car,but they do sound good at idle and going by and down the road:thumbs:
Personally, i dont run them, too much drone. I had the 40 series on my 79 prior to sidepipes. The sound was cool, but the droan inside the car was horrible. :ack: I'd get a head ache if I drove more than half hour at a time. I had a 50 series in an old GMC pickup that sounded great though with no droan. I'm not sure if the droan was due to our fiberglass cars or just the 40 series Flow Master. My Hooker side pipes and STS baffles are more quiet than the Flowmasters and they have no droan. :thumbs: |
Originally Posted by blckslvr79
(Post 1574115620)
:iagree:
I had the 40 series on my 79 prior to sidepipes. The sound was cool, but the droan inside the car was horrible. :ack: I'd get a head ache if I drove more than half hour at a time. I had a 50 series in an old GMC pickup that sounded great though with no droan. I'm not sure if the droan was due to our fiberglass cars or just the 40 series Flow Master. My Hooker side pipes and STS baffles are more quiet than the Flowmasters and they have no droan. :thumbs: |
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