zippy Posted January 20, 2004 Report Share Posted January 20, 2004 Flowmaster: The Resonance Maker. Link to comment Share on other sites More sharing options...
a1cmaw Posted January 20, 2004 Report Share Posted January 20, 2004 i wouldn't say they get louder or quieter but the tone does change over time. Link to comment Share on other sites More sharing options...
Dylan06SS Posted January 21, 2004 Report Share Posted January 21, 2004 How hard was it to remove the interior and carpet to get the dynamat down? It wasn't too bad. Just make sure you keep track of where all your peices came from, nothing worse than having extra hardware at the end of a project. The back seat area was really easy, I've started to work on the front. I don't think I'll be pulling the front seats completely out (too much wiring to worry about) I'll just unbolt and work the dynamat under, cut holes and replace. I'm going to try and get the whole thing done this weekend. If I do I'll post step-by-step w/ pics for anyone interested. Link to comment Share on other sites More sharing options...
Nightshift Posted January 21, 2004 Report Share Posted January 21, 2004 Pics would be great! WW Link to comment Share on other sites More sharing options...
adams2003 Posted January 21, 2004 Report Share Posted January 21, 2004 Pics would be great! WW Link to comment Share on other sites More sharing options...
adams2003 Posted January 21, 2004 Report Share Posted January 21, 2004 I had a flowmaster on my blazer and it did seem to get louder over time. Link to comment Share on other sites More sharing options...
m396 #00-011 Posted January 21, 2004 Report Share Posted January 21, 2004 How hard was it to remove the interior and carpet to get the dynamat down? It wasn't too bad. Just make sure you keep track of where all your peices came from, nothing worse than having extra hardware at the end of a project. The back seat area was really easy, I've started to work on the front. I don't think I'll be pulling the front seats completely out (too much wiring to worry about) I'll just unbolt and work the dynamat under, cut holes and replace. I'm going to try and get the whole thing done this weekend. If I do I'll post step-by-step w/ pics for anyone interested. Can you truly hear a difference? I have used dampners on many projects. Great for stereos, but do very little for road noise, drone, exhaust, etc. Upon further investigation, and speaking with many higher level techs at a few different companies, I came to a conclusion. Dampners, great for controling panel vibrations, especially with audio systems. Barriers, great for controlling road noise, exhaust drone, etc. I then backed this up with some testing of my own, but I don't have any data for the SS yet. I dropped 7dB in the vette though Just a little FYI ;) Link to comment Share on other sites More sharing options...
vdrumright Posted January 21, 2004 Report Share Posted January 21, 2004 Is the Flo-Pro something you would need two of like the Flowmasters or is it a dual in dual out muffler? C.K. No, it's a dual in dual out muffler. Link to comment Share on other sites More sharing options...
rdss Posted January 21, 2004 Report Share Posted January 21, 2004 VDrumright, thanks for the reply, I am still thinking of going with the true dual with an X-pipe, so, it will either be super 40's or probably Delta FLow 50 series. I guess there will be both Flow Master set ups in the Dallas tune and strip trip on the 24th. Yall should compare and let us know which is better for daily driving(resonance, overall sound), even though its totally an opinion. Thanks for any input. C.K. Link to comment Share on other sites More sharing options...
lgetz Posted January 22, 2004 Report Share Posted January 22, 2004 I have a 97 Tahoe and 2 Flowmaster 50 Series were installed in a true dual set up with 2.5" pipes exiting out the rear. Talk about loud And the resonance was very annoying. Went back to stock and now it has a single Magnaflow dual in and one out with a 3" side exit. Still rumbly with a bit of resonance but no where near as annoying as the Flowmasters. I agree with others that the Flowmasters will not quiet down any with use. Your ears simply will get used to them. Link to comment Share on other sites More sharing options...
NetMan Posted February 5, 2008 Report Share Posted February 5, 2008 Exhaust Drone Drone in the exhaust is due to the engine driving the exhaust system at its resonant frequency. You can't get rid of it, any length of pipe has a natural frequency, but you can change the frequency (RPM) it happens at. Stock exhaust systems are tuned to put the resonant frequencies outside the normal RPM range the engine is run in. Sometimes they add resonators for this purpose. To raise the resonant frequency of a system, shorten its length. To do this, you can try tail pipes that exit by the wheel (like GN's have), or you can try a muffler with a shorter internal flow path. If you have a true dual system, you can change the natural frequency of the system dramatically by adding a balance tube. If you can't shorten the system, then you can add slightly less than one wavelength of pipe. This will also raise the resonant frequency of the system. The wavelength in a single converter system (not true dual) is a little less than three feet at 3000 RPM. Shortening the system by a foot or so will move a resonance at 2000 RPM to about 3000 RPM. To move a resonance, calculate the wavelength at the RPM that gives the resonance you want to move. Then calculate the wavelength at the RPM you would rather it be at. The difference is the length of pipe you need to add or delete. Add to lower the RPM, delete to raise it. If you want to raise it but you can't cut any pipe out, then add one wavelength of pipe minus the amount you calculated. This will have the same affect. If you add or subtract a multiple of a wavelength exactly, you will not change the resonant RPM. Link to comment Share on other sites More sharing options...
BlackSS04 Posted February 5, 2008 Report Share Posted February 5, 2008 you really dug this one out of the woodworks. newbies, check the date of the post before you reply. p.s. - good description of drone, this is why i got corsa. Link to comment Share on other sites More sharing options...
NetMan Posted February 7, 2008 Report Share Posted February 7, 2008 ... I was just tryin' to make my 5 posts. LOL Link to comment Share on other sites More sharing options...
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