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Topic: Ism exhaust resonator options (Read 3855 times) previous topic - next topic

Ism exhaust resonator options

So planning on ordering a new resonator.
My options are
Jones Turbine JT5050XL under 9 pounds
Amazon.com: Jones Turbine Muffler JT5050XL Resonated: Automotive

MagnaFlow 12774 Exhaust Muffler 17.6 pounds
Amazon.com: MagnaFlow 12774 Exhaust Muffler: Automotive

I prefer quite over obnoxious but granted won't be were I'll ever hear it myself. Any one else have some similar recommendation to compare?
Thanks Scott

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Re: Ism exhaust resonator options

Reply #2 –
Quote from: Chuck & Jeannie –
You might find some other possibilities mentioned in the thread linked below:

Current resonator opinions


I actually got a lot of info from that post. Search function is well used by me usually. I'm leaning towards the heavier magnaflow. Lighter always seem tinnier sounding elsewhere. I just don't want to do it twice.
Scott

Re: Ism exhaust resonator options

Reply #3 –
A resonator may be the only replacement option. I have yet to hear one that is not loud.  Many anecdotal stories of performance improvement but no quantifiable evidence. Maybe a cooler bedroom.  Hold off as long as possible or go for as quiet as possible. 

Re: Ism exhaust resonator options

Reply #4 –
Well I was hoping to see a improvement on fuel economy. Roger you bring up a good point, I've got 4500 miles planned in June. I may hold off to re-establish a baseline. I'm sure I've made a improvement in regards to the fan control circuit from failed at a 100% operation and 9.6 mpg at 75 mph. 10% would be 45 gallons of fuel about.
Scott

Re: Ism exhaust resonator options

Reply #5 –
I feel no improvement in performance but it had good power before so no disappointment as I wasn't making the change for performance..Obvious reduced heat in bedroom probably as a result of less metal to hold heat plus a resonator and exaust on each side is easy to wrap.. By physics there should be some degree of lower EGT so another plus "probably" and finally it just plain sounds better imo with zero difference in exaust sound from the drivers seat. DWMYH I won't have another coach without a resonator.

Re: Ism exhaust resonator options

Reply #6 –
Try following a coach with a resonator or watching (listening to) one drive into a campground in the evening.

The only way to quantify a performance improvement is under identical conditions, loads, speed, wind, route.  Pretty rare that that will happen.

In 120,000 miles we are averaging about 8 mpg.  We did 9.8 mpg driving pur coach back from CA after we bought it,  more then 11 mpg from Denver to Hastings a few years later (nice tail wind) and better than 9 coming home from TX in April (another favorable wind) and better than 16 coming into Tucson. And less than 6 in a strong OK headwind.  We generally travel at 65 or less.

Your 20% more mpg especially at 75 mph is a lot especially considering that aerodynamic drag increases by 1/3 going from 65 to 75 and aerodynamic drag accounts for about 1/2 the total energy consumption.

Keep on recording your data.

Re: Ism exhaust resonator options

Reply #7 –
Quote from: Dub –
I feel no improvement in performance but it had good power before so no disappointment as I wasn't making the change for performance..Obvious reduced heat in bedroom probably as a result of less metal to hold heat plus a resonator and exaust on each side is easy to wrap.. By physics there should be some degree of lower EGT so another plus "probably" and finally it just plain sounds better imo with zero difference in exaust sound from the drivers seat. DWMYH I won't have another coach without a resonator.
Do you recall which one you installed? Reducing Bedroom heat is actually quite hi on my list of wants
Scott

Re: Ism exhaust resonator options

Reply #8 –
Roger I just calculated miles round trip and fuel used for miles. Fill up prior and ending fill up. Yes temps and all the other factors will vary, but 4500 miles should help round it out. Yes I'll attempt to slow down and save some fuel. Almost made it to Kingman AZ from our house last time before I gave in. Baby steps
Scott

Re: Ism exhaust resonator options

Reply #9 –
I installed the Jones 5050xl on my last coach and the coach I currently have already has the same on it. The other one I considered was the aero turbine 5050xl.  Looking at the web page for both they look identical just the Jones was about half price.. the only thing I noticed was the difference in the heat in the bedroom when we stop. Yes it is louder from outside but not noticeable from the drivers seat except for when your next to a concrete  barricade or in a tunnel.  If we get to a campground late I try to be as quiet as I can and not sit idling. Do I like it? Yes. Would I do it again? Yes.

Keith

Re: Ism exhaust resonator options

Reply #10 –
Quote from: dsd –
Do you recall which one you installed? Reducing Bedroom heat is actually quite hi on my list of wants
Scott
Jones.. The reduced bedroom heat and mattress not as hot at the end of the day is a fact in my case. I've heard many enter and leave campgrounds with resonator Roger and it just doesn't last long enough to be an issue for me. It may bother others, I've never heard it mentioned.

Re: Ism exhaust resonator options

Reply #11 –
Could use two resonators? Two in a row or two side by side (if you knew someone who is a handy guy with a welder, Scott).  Twin 5" exhaust tips.  Wouldn't that be cool.

Re: Ism exhaust resonator options

Reply #12 –
Sounds like a hard pass. Too much work to route out the right side of the coach. Here's a picture of my last exhaust spark arrestor on the Bronco.
Scott

Re: Ism exhaust resonator options

Reply #13 –
Recently installed the MagnaFlow and find the noise level about the same as the original muffler.  Wish I had done it years ago.

Re: Ism exhaust resonator options

Reply #15 –
Did a number notice more boost?  Seems I recall some saw a bit, not know if matters. 

Noise sensitivity of exhaust, outdoor music, tv, barking dogs, and motorcycles is in the ear of beholder.  I hear some are sensitive to other activities of fellow campers. 

We did not realize the exhaust noise might still be a problem as we do already avoid early morning warmups, maybe we try to arrive noon? We can try to be more selective too where park but no one has mentioned the noise as a problem, maybe they just being forgiving  and we have been taking advantage of them.

we do really like the resonator reduction of coach room temps when we pull in to park from a day of 100+ degrees.  That why we changed.

Re: Ism exhaust resonator options

Reply #16 –
Mike, no increased ISM450 boost pressure, but throttle response is significantly improved.  Most noticeable when cruise control is engaged...zero lag.  No more puff of black smoke on takeoff either.

The increase in exhaust decibels aside, I've never had a complaint in 2+ years of running the Jones.  Chipped 1/2 ton diesel pickups with the coffee can mufflers are 10 times louder. 

The 40 pound weight savings are another big plus.  But most of all....it's awesome to gun it in a tunnel or overpass with the driver's window down!!! 

Not one single resonator regret....Woody.

Quote from: Michael & Jackie –
Did a number notice more boost?  Seems I recall some saw a bit, not know if matters. 
Noise sensitivity of exhaust, outdoor music, tv, barking dogs, and motorcycles is in the ear of beholder.  I hear some are sensitive to other activities of fellow campers. 



We did not realize the exhaust noise might still be a problem as we do already avoid early morning warmups, maybe we try to arrive noon? We can try to be more selective too where park but no one has mentioned the noise as a problem, maybe just  polite snd we been taking advantage of them.

we do really like the resonator reduction of coach room temps when we pull in to park from a day of 100+ degrees.  That why we changed.

Re: Ism exhaust resonator options

Reply #17 –
This  post is perfect for me as I need to repair my exhaust so it gives me lots to think about.

Re: Ism exhaust resonator options

Reply #18 –
Woody,  I do wish it is not offensive, am tempted to go back to muffler.  Maybe just sell it, get trailer or nothing, or try to modify how/where we take it?  Tbd.  We go to one park know all, seems fine, i may check though.

I forgot, you are right, the response is noticeable.  The temp reduction almost crucial to wife.

Gosh, converted it long ago...i think Dave Merzger told me too.  Miss him, a help when we were new to RV.

His brother I recall told me to convert the step, great change plus MCD.

Re: Ism exhaust resonator options

Reply #19 –
Quote from: Roger & Susan in Home2 –
A resonator may be the only replacement option. I have yet to hear one that is not loud.  Many anecdotal stories of performance improvement but no quantifiable evidence. Maybe a cooler bedroom.  Hold off as long as possible or go for as quiet as possible. 
I 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.