Muffler delete people/drone haters, question
 

I am really frustrated with 370z exhuast options, coming from a camaro we had a lot better options and much lower prices. Maybe its a import thing, but prices for performance parts are much higher in cost.

This is why i am looking deeply into a muffler delete, for the time being. I do like the sound. I will in time upgrade to a cat back, but for now i want a quick and cheap fix.

I know muffler delete can have drone, the camaro guys had a fix for this problem. called J pipes. You could buy a delete kit that already had the J pipes on them.. Anybody here have any experience with J pipes ?

here are some pics to get the picture in your head.

Never seen or heard of them


EDIT, those look like the resonators Ark and I think Motordyne put on their HFC's and such

Does this ghetto áss solution really work?!?!?!

Is that the same concept as a resonator, basically?

Helmholtz resonator. Some guys custom weld them. A few exhaust manufacturers use them as well. Reason why aftermarket parts are so much more is because this is a low volume vehicle. You came from a car that has 100,000+ sales every year to a car that is currently around 8,000 per year. So we foot the bill for R&D instead of sharing it with shed loads of others. A high quality exhaust cost 2x what it would on a domestic. Headers are slightly cheaper though. Just expect everything to be 2x as much and half the performance gains.

I'll be doing a muffler delete with GTM resonated test pipes for my setup. Mike you know how my Camaro sounds now, no mufflers, HFCs, shorty headers... Its loud and I love it haha. I don't mind or even notice drone. Most aftermarket exhausts for any car are too mild for me.

Ya kind of funny how i sold you those parts also!

It does more than what a resonator does, it does something with frequencies. regular style resonators really do not cancel drone out, rather reduce it. There is ways to completely cancel out drone, and have your exhaust sound as loud as ****. Ever heard of a corsa exhaust, they have something in there exhaust that can tone out exhaust sound at a certain frequency.
Corsa Performance Exhaust - Reflective Sound Cancellation™ BUT that pretty much corsa exclusive, most go with the helmohtlz

YES it works !

Ya i forgot, thats what they are called. I guess i will have to look into a custom job.

:tiphat:

yeah, one of our members did them on his, but he has since moved to the mustang.


http://www.the370z.com/intake-exhaus...rks-great.html


btw, I'm mike@thepowdercoater.com on camaro5, but I only post in my one thread in the classifieds there for caliper powdercoating.

I can't believe this ghetto solution works!!!

Someone needs to produce these!!! Cheaper than the AAM short tails and NO DRONE?!?!?!
NOW we're talking!!!

I am looking into AAm short tails and was shocked they did not offer this. most hate drone....

for sure have heard of your powder coating. cool!

Its not to hard to design, I took a course on wave physics. You just figure out the frequency you want to cancel out (which is the one responsible for the drone) and make a resonator to a size that will effectively cancel this wave out. Back in my Motocross days I looked at doing this to my own exhaust on my quad.

https://encrypted-tbn3.gstatic.com/i...h8lTtdtDyZ58WA

All the equations to determine the size and length of the chamber can be determined from the equations on the Wiki page

Helmholtz resonance - Wikipedia, the free encyclopedia

Helmholtz resonators work.

Very interested in this on a set of muffler delete pipes like the AAM short tails.

Just ran this idea across with our engineer, and this was his response verbatim "Im for it.. they work - ive got great experiences with them."

No time frame, as he needs to figure out the math on how long the j-pipe or resonator needs to actually be to cancel out as much rasp/drone, then we will play around with where and how the pipe will be placed :)

I wish I can like things on my government computers, because I like how AAM works in real time to try new things when someone has an idea

Sweet.

outstanding response! If you can make a short tail with this on it, and still keep it decently cheaper than leading catbacks. it should be very successful.

This would be awesome! I am definitely in for it! Keep us posted on updates.

Id buy this asap if it ends up going on the market!! :)

Not the same as what your talking about but check it out.

http://www.the370z.com/parts-sale-pr...esonators.html

It will probably end up looking like the HKS resonator 'grenades' above the mufflers, just without the mufflers. I know my HKS system resonates out most of the drone and rasp through all the frequencies. Makes for an awesome sounding exhaust at both idle/cruise and when I nail it to the floor!

Why are companies like Fast Intentions completely ignoring this aspect of their products?? They could easily account for this on each catback they design and build them with the side resonators already attached. Is it laziness, greed, what? The drone on the Fast Intentions catback with 18" resonator (inline, not like these) and stock cats is ridiculously annoying.

Everything in life is about money. Im sure no one has tried it yet due to cost of r & d and such.

The only real reason I can see is that different combinations of cats, exhaust headers and catback exhausts would make picking one size Helmhoktz resonators impossible. But they could at least put one on for the base config of stock cats/headers with their catback exhaust. This is poorly-discussed aspect of their exhausts on this form as this is the primary reason I will be paying labor costs again to have this exhaust removed, plus taking a loss in the form of a restocking fee since it now not be sold as new (it's all of 48 hours old).

Its been done and is in use in some hfc's that are available for our car. Had you researched more, you would know this.