Brian wrote:On every application there is a certain rpm where a new Helmholtz can makes some metallic resonance when new, and 'metallic when new' is noted over and over in the forums.
Really. I find that very interesting. I have scoured your site, listened to ALL your videos and called and talked to Ryan about this entire system BEFORE I purchased. I inquired into each component as I didn't intend to buy the entire system at first. He told me about the HH and how wonderful the SuperQ muffler is with the entire system and header. Not ONCE did anyone mention or document that every Helmholtz makes a metallic resonance! I didn't research all the web on this system because I trust GWR. I have been a customer of your through 4 Miata over the last 12 years!
I bought my first exhaust system from you for my 2006 LE (I was one of the first owners of an NC in my parts). I called and spoke to you on the phone about your midpipe/muffler combo. I remember you told me on the phone that the NC engine had a tendency to have some boom/drone under certain conditions. I bought it with this in mind... and you know what? It was exactly as you said so I felt fine with my purchase as I felt informed. However, on this purchase if feel deceived. I bought the entire system to get the sound in your video. I did not get that sound. Far from it.
My wife rather we take a different car when we go out as she hates this sound. I took the car to a club meeting (show & shine at a local Mazda dealer) and one of the long timers asked what system I had installed. When I told him his comment was "need to remember not to buy that". I made the excuse that it may just be something else vibrating - which I've since proved it isn't.
Brian wrote: If you check the threads at Miata.net you will read that more than a few mention they ordered up the glass packed baffles to absorb metallic and rasp early on, and many report they used them just a few weeks to a few months before checking the system sound without the glass packed baffles and discovering the baffles were never needed again.
Don't you feel that you should mention this to folks when purchasing?? Especially internationally due to the increased shipping/return costs.
Do you think altitude could affect how the HH chamber is operating? I know temperature does.... altitude changes density too.
Brian wrote: Thus, suggest you try the baffles that my team already sent before you conclude you really tried 'everything'.
You are right Brian. It's a sign of my frustration. Baffles should be here tomorrow or Tuesday. I'll give it an honest go. My wife will also be part of the experiment as she is more neutral on this issue than I probably am by now. I just am unsure how baffles will minimize the sound that is emanating FROM the HH chamber itself. I'm sure that some is trumpeting out the back too so maybe we can absorb enough that it won't be so bloody annoying from the interior. But if it does the trick I'll be satisfied.
but we don't drive that way and your video shows the new muffler at the back is already doing a good job of filtering most of that. With time the muffler will just filter that more and more as the glass fibers gain mass with carbon addition and all bare metal gets coated start to finish in the system.
Brian wrote:Nonetheless, we are all using different ears to hear it, so if that's what you ultimately prefer we would help.
I want more than anything to fix this. It's just not "my ears". I have had probably about 20 people between my wife, neighbours, club members and a few very savvy gear heads involved in this. EVERY single one of them think something is very wrong here.
Brian wrote:If still not happy after trying baffles we would trade you to the traditional fiberglass midpipe, but I really think you are giving up early here and going the wrong direction.
How's this for a plan.... if the new baffles allow me to drive this without hating it (including my wife) I'll drive it a lot to carbon it up. But if the baffles don't work to make it reasonable to drive or it doesn't work without them after many more miles I'd like to discuss options with you or Ryan on the phone. I don't want something for nothing but my unique circumstance I hope will allow you to think about a unique solution that precludes me or you from paying UPS the equivalent value of a different midpipe solution. But we can cross that bridge if it comes to it. We should know in a couple of days.