interesting muffler test results

grumpyvette

grumpyvette

Administrator
Staff member
read thru the links and sub -links or youll miss a good deal of info

http://www.mustang50magazine.com/techar ... index.html

and
http://www.pontiacstreetperformance.com/psp/exhaust.html

http://www.dapa.org/drag-racing-with-jim-hand-part-12-exhaust-system-update/

http://www.dragzine.com/tech-storie...ffler-design-and-sound-absorption-strategies/

http://www.superchevy.com/how-to/exhaust/0505phr-exh/


On the Dyno

Open Exhaust Bassani Bassani Real Street Borla XS Borla XR1 DynoMax Edelbrock Ultra Flo
RPM PWR TRQ PWR TRQ PWR TRQ PWR TRQ PWR TRQ PWR TRQ
2,750 103 196.7 87.1 182.9 89.9 188.8 111.7 213.4 102.1 195 105.1 200.7
3,000 138.9 243.1 109.1 208.4 107.2 204.7 148.3 259.6 141.1 247 140.9 246.7
3,250 168.6 272.4 146.2 255.9 148.6 260.2 176.6 285.4 168.9 273 168.4 272.2
3,500 189.6 284.5 173.2 279.8 177.1 286.2 195.4 293.2 189.1 283.7 189.3 284.1
3,750 202.3 283.3 192.3 288.5 194.8 292.3 207.9 291.1 203.7 285.3 204.5 286.4
4,000 214.6 281.8 204.8 286.8 208.3 291.8 219.2 287.8 215.6 283.1 214.9 282.2
4,250 239.6 296.1 216.6 284.3 220.7 289.8 244.3 301.9 243.2 300.5 243.1 300.4
4,500 269.5 314.5 241.3 298.2 244.7 302.4 274.1 319.9 270.9 316.2 271.9 317.3
4,750 291.6 322.4 272.3 317.8 274.1 319.9 294.6 325.7 295 326.2 295 326.1
5,000 308.7 324.2 293.7 324.7 295.5 326.8 310.1 325.7 311.7 327.4 310.9 326.5
5,250 326.3 326.4 308.7 324.3 310.9 326.6 329.4 329.6 330 330.2 329.2 329.3
5,500 345.7 330.1 329 329.1 330.8 330.9 348.3 332.6 349.8 334 349 333.2
5,750 359.2 328.1 349.3 333.5 349.6 333.8 363.8 332.3 362.4 331 362.8 331.4
6,000 365 319.5 361.4 330.1 364.1 332.6 370.9 324.6 370 323.9 368.7 322.8
6,250 365.2 306.9 369.3 323.3 371.2 324.9 373.3 313.7 369.6 310.6 369.4 310.4
6,500 358.8 289.9 372 312.6 373.7 314.1 369.2 298.4 369.8 298.8 367.4 296.9

Performer RPM Flowmaster Flowtech Afterburner Flowtech Terminator Flowtech Warlock FlowtechWarlock
(open)
RPM PWR TRQ PWR TRQ PWR TRQ PWR TRQ PWR TRQ PWR TRQ
2,750 105.3 201.2 102.8 196.3 103.9 198.4 102 194.8 102.6 195.9 109.5 209.1
3,000 143.9 251.9 140 245.1 140.9 246.7 138.9 243.2 142 248.6 151.5 265.1
3,250 170.6 275.7 168.9 273 168.4 272.2 170.3 275.1 169.4 273.7 178.9 289.1
3,500 190.2 285.5 189.4 284.1 189.8 284.9 189.1 283.8 185.6 278.5 193.3 290.1
3,750 203 284.4 202.8 284 202.9 284.1 202.4 283.4 199.7 279.7 207.1 290
4,000 215.1 282.4 213.2 279.9 212.9 279.5 213.2 279.9 211.6 277.8 220.8 290
4,250 242.6 299.8 242.2 299.3 240.5 297.2 241.6 298.6 237.8 293.9 248.1 306.6
4,500 272.2 317.7 271.7 317.1 270 315.1 270.7 316 264.4 308.6 276.9 323.2
4,750 294.6 325.7 291.2 322 292.7 323.6 294.1 325.2 281.9 311.8 292.9 323.9
5,000 310.3 326 306.6 322 306.8 322.3 307.4 322.9 295.7 310.6 306.2 321.7
5,250 328.2 328.4 327.6 327.7 325.9 326 326.8 327 318.3 318.4 328.5 328.7
5,500 347 331.3 347.4 331.8 345.7 330.1 346.9 331.3 340.7 325.3 348.8 333.1
5,750 362.2 330.9 361 329.7 359.7 328.6 361.3 330 356 325.2 362.3 331
6,000 368.7 322.7 369.4 323.3 368.4 322.5 368.4 322.5 363.1 317.8 370.7 324.5
6,250 370.9 311.7 368.3 309.5 372.3 312.9 369.5 310.5 366.3 307.8 374.2 314.4
6,500 366.1 295.8 363.7 293.9 366.3 296 366.2 295.9 363.7 293.9 369.7 298.8

Hooker Aerochamber Hooker MAXflow MAC MagnaFlow SpinTech
RPM PWR TRQ PWR TRQ PWR TRQ PWR TRQ PWR TRQ
2,750 103.4 197.4 102.1 195 104.6 199.8 105.3 201.2 105.2 201
3,000 140.5 246 142 248.6 142.3 249.1 143.8 251.8 142.2 249
3,250 168.3 272 172.5 278.8 166.3 268.7 171.3 276.8 167.3 270.3
3,500 190.7 286.2 189 283.6 188.6 283 189.4 284.3 190 285.1
3,750 203.2 284.7 204 285.7 202.9 284.2 204.3 286.1 203.6 285.1
4,000 213.6 280.4 214.7 282 213.1 279.9 215.8 283.4 213.3 280
4,250 240.2 296.9 244.8 302.6 240.2 296.8 244.5 302.1 240.7 297.5
4,500 270.6 315.9 274.8 320.8 268.5 313.4 274.2 320.1 269.5 314.6
4,750 293.5 324.5 296.1 327.4 292.7 323.6 294.1 325.2 293 324
5,000 308.3 323.9 309.9 325.5 310.3 325.9 308.8 324.4 310.8 326.5
5,250 327.1 327.3 329 329.2 328.2 328.4 328.9 329 329 329.1
5,500 346 330.4 348.7 333 347.1 331.5 348.2 332.5 347.9 332.2
5,750 360.4 329.2 362.7 331.3 362.7 331.3 363.6 332.1 362.2 330.8
6,000 368.8 322.9 370.3 324.2 368.7 322.7 370.6 324.4 369.6 323.5
6,250 372.1 312.7 373.5 313.9 372.3 312.9 372.8 313.2 371.6 312.3
6,500 368.8 298 371.8 300.4 363 293.3 369.1 298.3 369.5 298.6

There's so much data here, we simply don't have room to dissect it all, but you have it now, so you can choose the mufflers you are interested in and run the numbers through Excel if you are really serious about eking out every last horsepower. If so, Rick Anderson says to pay particular attention to the average horsepower between 4,700 and 6,600 rpm. This range is critical for drag racing this combo. Rick says the best muffler in that range is the Bassani Real Street, but it's probably too loud for the street (and that's saying something coming from Rick). The Hooker MAXflow, both Borlas, and the MagnaFlow closely followed the Bassani RS with good average horsepower in that range. In the end, we say find one that sounds good to you and your wallet and go have fun.

Sounding Off
Muffler Decibels At Idle Decibels At 2,000 RPM Decibels At WOT
No Muffler 91 103 Max.
Bassani Street 83 96 120
Bassani Real Street 84 96 Max.
Borla XS 80 90 110
Borla XR1 83 96 118
DynoMax Ultra Flo 83 94 113
Edelbrock RPM 84 93 118
Flowmaster 82 93 115
Flowtech Afterburner 86 94 115
Flowtech Terminator 86 94 119
Flowtech Warlock 83 92 112
Hooker Aerochamber 87 94 114
Hooker MAXflow 80 90 120
MAC 87 98 119
MagnaFlow 82 91 114
SpinTech 87 97 116


an (X) pipe helps reduce noise and flow restriction
Xpipeinside.jpg


mocking it up
Xpipemockup.jpg





1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).


keep in mind adding an (X) pipe blends and splits the PULSED flow between the two sides of a dual exhaust , effectively cutting the flow each muffler sees in half. this reduces the restriction to flow.
read these
viewtopic.php?f=56&t=1503

viewtopic.php?f=56&t=495

viewtopic.php?f=56&t=1303

viewtopic.php?f=56&t=1166

viewtopic.php?f=56&t=3155
 
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Pickup Truck Muffler - Drone Free HP For Your Truck
Pick Up 20-Plus Hp For Your Pickup With Dynomax's New VT Muffler
From the November, 2010 issue of Circle Track
By Rob Fisher

Dynomax VT Muffler
Now, we know that a street performance muffler has no place on an oval track race car, but let's face it, each and every one of us tow our cars to the track with a truck of some type. Recently, DynoMax Performance Exhaust introduced the DynoMax VT muffler, a revolutionary, high-flow stainless steel performance muffler that controls irritating drone while ensuring maximum performance on a full-range of street applications for muscle cars, SUVs and, of course, trucks.

The DynoMax VT muffler features an exclusive, precisely calibrated patented internal valve that ensures maximum performance and provides a drone-free experience in the vehicle. The 100-percent welded stainless steel muffler is available in a side inlet/center outlet 14-inch body length and a side inlet/side outlet 16-inch body length. Inlet/outlet bushing diameters include 21/4-, 21/2-, and 3-inch sizes. That means it can easily be fitted to a wide range of vehicles.

The new muffler also includes slotted bushing ends; exclusive Continuous Roving Fiberglass (CRF) technology that absorbs additional unwanted interior resonance and provides a rich, deep performance tone; and a high-impact finish.

The new muffler-engineered to deliver the DynoMax's trademark "Drone-Free Performance"-offers the flow characteristics of the legendary DynoMax Ultra Flo welded muffler, through a straight-through unrestricted design that is dyno-proven to support up to 2,000 cfm and 2,000 hp. But oval track racers should love the extra power and gas mileage they get from their trucks.

"I was very impressed with the DynoMax VT muffler. For years, manufacturers have been searching for a way to cancel out drone without losing power, performance and sound. The VT muffler does that," said Ed Hanson, owner of Ed Hanson's Muffler Service, Spring Valley, California. "We've been using it for a couple months on a shop vehicle and we've even noticed an improvement in gas mileage. The VT muffler will be a success."


dr1.jpg

In exhaustive development of the VT muffler, DynoMax undertook a number of different tests including putting the muffler on the flow bench where it flowed 841 cubic-feet-per-minute flow, compared to 588 cfm and 373 cfm for some other popular brands. In addition, when DynoMax bolted the VT onto a 2009 Chevy Silverado it saw an increase in 23 hp over the stock mufflers. And extra horsepower is something every oval track racer can identify with, whether it's in our race cars or in our tow vehicles.

The new stainless muffler is covered by a limited lifetime warranty and exclusive 90-day Performance and Sound Guarantee, an offer that lets enthusiasts try the muffler for 90 days. If you don't like it, return it within 90 days for a full refund of its purchase price. In addition if you buy one at a participating retailer any time through August 31, 2010, you can get a $25 mail-in rebate.
Dynomax
Monroe
MI
734-384-7806
http://www.dynomax.com/index.php

I FOUND THIS INFO POSTED ON A DIFFERENT SITE
"installed new exhaust with Dynomax VT mufflers; quiet at idle and at cruise AS advertised, but flapper valve made car sound like a coffee can full of nuts and bolts as some rpms. Dynomax sent another set w/ heavier spring; still no go. To their credit, they sent a set of (no moving parts) Super Turbo mufflers. Mechanic surmises that the VT muffs would work on a basically stock engine W/O too much cam. I was disappointed that they did not work out as it really sounded healthy when you put your foot in it.

Oh well, hope my misadventures help someone out..."

mufflow.jpg
 
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