Re: Ism exhaust resonator options Reply #20 – May 17, 2021, 08:35:51 am About two weeks ago, we were at a FT Rally in Vero Beach. Got the opportunity to compare the sound of my coach with the Jones XL5050 which I installed on my coach to Gary's coach with the Magnaflow. There were also several FT ISM's there with stock muffler cans...Here's how I'd compare.. At idle, the noise level is "close", the JonesXL is definitely more "throaty, deeper", and more sound. Both are significantly loader than stock. When Gary exited the campground to the street and accelerated, not nearly as loud as me with the JonesXL! With the Jones, it's a healthy deep growl on acceleration, like a heavy Fire Engine...No one's ever complained to me... We are very mindful about trying real hard to only idle as we move through a campground... We do turn heads when we come in... Might just be because we're a coach that many don't see often?Have not compared mileage, boost, etc. I will tell you that two benefits we see are: the bedroom is cooler and the transmission no longer hunts and shifts between 6th and 5th gear when using cruise control on small hills. Oh, you can service the start batteries real easy now, and I think I'll build a tool crib back there for my tool boxes, lots of room,Would I do it again- yes. Which one would I use- Magnaflow. Make sure you install a curved exhaust tip, (our stock one was straight) and don't point it towards the ground. The velocity from these resonators is greatly enhanced! You run the risk of melting paint on your toad with the straight tip...Best Jeff Quote Selected
Re: Ism exhaust resonator options Reply #21 – May 17, 2021, 09:11:39 am My coach already had a resonator installed and to be honest I don't know which one it is so can't help there. People have commented on how throaty and loud mind sounds. I like it. I noticed a definite difference between a stock model and mine in terms of sound.And while saving some fuel would be nice I don't count that, I just don't have the time to track it that well. Some people are detail oriented I'm not. Quote Selected
Re: Ism exhaust resonator options Reply #22 – May 17, 2021, 12:17:44 pm Quote from: John S – May 17, 2021, 06:51:59 amI used 178 gallons less in fuel on my cross country trip. I kept track of every gallon that went into the coach and the location. I used to add up the gallons and see the difference over20 years and three different coaches. Also I would get more boost from my turbo that I could see on the Silverleaf. It was noisier at full throttle outside but inside the coach I could not hear a change. My numbers also done with an average of 4 trips each way. I also it higher speeds on the same grade I would drive every trip. It was about 5 mph difference. I was hoping to see a savings of 45 gallons in 4500 miles. Not concerned of boost as much as temps and efficiency within time restraints. Performance and efficiencies can go hand in hand. Which resonator did you install? Note; My muffler is in pretty good condition and with less than 55k miles. Slight surface corrosion at welds. I'll hold on to it for awhile and if we are happy with new it will be available to some one before I tossScott Quote Selected
Re: Ism exhaust resonator options Reply #23 – May 17, 2021, 01:18:55 pm The weight loss and the cooler bedroom are enough for me. If there is a performance gain or mileage improvement I have no idea as I didn't have a baseline to compare to. But I definitely would do it again just sooner. Quote Selected
Re: Ism exhaust resonator options Reply #24 – May 17, 2021, 02:17:11 pm Quote from: Beeman – May 17, 2021, 08:35:51 amAbout two weeks ago, we were at a FT Rally in Vero Beach. Got the opportunity to compare the sound of my coach with the Jones XL5050 which I installed on my coach to Gary's coach with the Magnaflow. There were also several FT ISM's there with stock muffler cans...Here's how I'd compare.. At idle, the noise level is "close", the JonesXL is definitely more "throaty, deeper", and more sound. Both are significantly loader than stock. When Gary exited the campground to the street and accelerated, not nearly as loud as me with the JonesXL! With the Jones, it's a healthy deep growl on acceleration, like a heavy Fire Engine...No one's ever complained to me... We are very mindful about trying real hard to only idle as we move through a campground... We do turn heads when we come in... Might just be because we're a coach that many don't see often?Would I do it again- yes. Which one would I use- Magnaflow. Make sure you install a curved exhaust tip, (our stock one was straight) and don't point it towards the ground. The velocity from these resonators is greatly enhanced! You run the risk of melting paint on your toad with the straight tip...Best JeffThanks for the input. Much appreciated Scott Quote Selected
Re: Ism exhaust resonator options Reply #25 – May 17, 2021, 10:27:48 pm Scott, not trying to change this thread, but if you really want to cool down the bedroom....I also did the Dynamat insulation. I removed the stock heat blanket, fully lined everything with Dynamat, then put the stock blankets back on. On the inside, I removed all the carpet and black mat, lined the entire bedroom floor and bed pedestal with the Dynamat, then put in new pad and carpet.The difference is noise is really good, but the heat difference is amazing. We get no noticeable heat from the engine compartment any more. Glad we did it.The above is from a different thread. Quote Selected
Re: Ism exhaust resonator options Reply #26 – May 17, 2021, 10:56:03 pm Quote from: MarkC – May 17, 2021, 10:27:48 pmScott, not trying to change this thread, but if you really want to cool down the bedroom....I also did the Dynamat insulation. I removed the stock heat blanket, fully lined everything with Dynamat, then put the stock blankets back on. On the inside, I removed all the carpet and black mat, lined the entire bedroom floor and bed pedestal with the Dynamat, then put in new pad and carpet.The difference is noise is really good, but the heat difference is amazing. We get no noticeable heat from the engine compartment any more. Glad we did it.The above is from a different thread.Mark I had previously added extra insulation when I removed the carpet and installed vinyl planking. Added a inch to the inside of the coach and a inch under the mattress. I will eventually work my way into the engine compartment but not till the end of summer. Took off today June ,July, August. Yes more insulation is always a plus in my world. Just can't catch every ball since I purchase our coach. So much to do! So I ordered a 30" magnaflow XL. It will arrive on the 20th so will start that project then and hopefully will have other projects completed. We depart near June 1st when DW is out of school. Fourdaysoff Jim has some extra 5" bends and should be able to salvage enough to do a decent install. Scott Quote Selected
Re: Ism exhaust resonator options Reply #27 – May 17, 2021, 11:22:50 pm Scott will the 30 inch muffler be quit a bit quieter than the 20 inch muffler.Peter Quote Selected
Re: Ism exhaust resonator options Reply #28 – May 17, 2021, 11:33:35 pm Actually laughed out loud. I have no clue, but it's 50% larger. I have between the current muffler and the Crome tailpipe 40+" so there is enough room possibly with a small off set in the rear. Will know more once it's in my hand. Was really trying to hold off doing it but twice across the states is being incentive to get it done. I like the price of the Jones xl but I've kinda learned over the years you get what you pay for. It's also double the weight, maybe it will last longer?Scott Quote Selected
Re: Ism exhaust resonator options Reply #29 – May 18, 2021, 10:04:21 pm Scott, am anxious to hear your results. I would change out the "barrel" in a heartbeat if I knew I could find something to stay relatively quiet. I have been in parks when rigs with the resonators have pulled out and they are for sure noticeable. I want the extra performance but not the extra noise even if I can't hear it from the drivers seat.Safe travels and good luck on your trip ! Quote Selected
Re: Ism exhaust resonator options Reply #30 – May 19, 2021, 02:57:27 pm Just order a 30 inch Magnafow this morning. Quote Selected
Re: Ism exhaust resonator options Reply #31 – May 19, 2021, 05:30:49 pm ShoQuote from: oldguy – May 19, 2021, 02:57:27 pmJust order a 30 inch Magnafow this morning.Should of waited couple of days till I figure out how much of a pain it will beScott Quote Selected
Re: Ism exhaust resonator options Reply #32 – May 21, 2021, 06:52:46 pm So got home and box was on porch. Beat up a bit. One small ding in the side of the muffler and a end flange bent, but fixable. I look inside and to my surprise my 5 inch muffler is necked down to 4 inches for the length of the muffler then back up to 5 to exit. Thought I had bought a five inch muffler. Not what I thought I had purchased at all. Does anyone who purchased the Jones know what the inside pass threw diameter is? Curious if it is necked down also. It certainly will make it quieter but concerned about the additional back pressure.this is a 35% restriction. Scott Quote Selected
Re: Ism exhaust resonator options Reply #33 – May 21, 2021, 07:14:20 pm Hey Scott, just as an FYI, in my former life I did a bit of work with high performance diesels in the pickup market. We were able to make 800+rwhp through 4" exhaust, so I doubt it's going to cost you power. Quote Selected
Re: Ism exhaust resonator options Reply #34 – May 21, 2021, 10:21:02 pm Scott does it look as some of the exhaust gas could go around the center of the muffler. I think I read something about that. Quote Selected
Re: Ism exhaust resonator options Reply #35 – May 21, 2021, 10:26:12 pm Quote from: dsd – May 21, 2021, 06:52:46 pmI look inside and to my surprise my 5 inch muffler is necked down to 4 inches for the length of the muffler then back up to 5 to exit. Thought I had bought a five inch muffler.I warned about this fact in two previous "resonator" threads, but I guess you didn't get the memo. Sorry about that.Resonator (Reply #2)Current resonator opinions (Reply #36)I agree with Keith (above). Try measuring the O.D. of your exhaust pipe where it exits the turbo. If it is 4" then the 4" core on the Magnaflow won't matter. Quote Selected
Re: Ism exhaust resonator options Reply #36 – May 22, 2021, 12:01:01 am Okay I agree that it is equal or bigger than the turbo restrictions itself. I also know the convergent and divergent cones will dynamically change the airflow speeds and disrupt noise transmission making it quieter. I'm also confident that it will flow better than the current muffler. I also know it is in my possession and the Jones XL arrival will happen when I'm in Michigan, thus being worthless to me for this trip. It's going on next couple of days. Chuck yes you made clear representation of what I discovered. Seems like I've been too busy chopping, no time to sharpen my axe. Peter this picture makes it look tapered , it is a straight 4 inch inside. Keith thanks for the help. Couple weeks it will all be behind me.Scott Quote Selected
Re: Ism exhaust resonator options Reply #37 – May 22, 2021, 12:28:26 am Thanks for the picture, I see what I will be getting. Quote Selected
Re: Ism exhaust resonator options Reply #38 – May 22, 2021, 02:32:38 pm So in researching Keith seems to be correct. The temperature post the turbo has had a lot of energy extracted mechanically and is rapidly cooling. In cooling it is shrinking and you could actually have a convergent cone all the way to exit point and still have the same flow resistance. Still rapping my head about all of it and pushing forward with install. I'm sure I'm my own worst enemy. Also was told at he same time that a EGT would be beneficial on the long pulls pre turbo to help self regulate right foot issues. Higher rpm, lower power setting will help. Never endingScott Quote Selected
Re: Ism exhaust resonator options Reply #39 – May 22, 2021, 02:36:20 pm Scott, pre-turbo vs post-turbo EGT can vary dramatically. When we used to test this, we could see from nothing (at low boost/drive pressures) to as much as 400*F temp differences. This is why my EGT thermocouple is in the exhaust manifold...where the quick transient heat measurement will be...between the engine and the cork (turbo). The higher the drive to boost pressure ratio, the larger the difference in EGT measurements generally. Quote Selected
Topic: Ism exhaust resonator options