MOTORDYNE ART Pipes - Review

Motordyne

Thanks for the link Arnold! . I'll keep it in mind as a backup but the images should be posted on our website later tonight.

quagmire87

Sweet can't wait!!

AlphaSnacks

Woooooooooooo!!

EZT

Just purchased a set; looking forward to seeing them and installing!

EZT

Art V3 + F.I. CBE = Pure sex.


And those demon bolts suck ***.

harp00n

How do you think, if I remove these tab connections on the pic:



will it decrease the drone I get on load at 2000-3000 rpm? I believe these tabs can transfer the drone to the cabin as I had Berk's HFC before and it didn't make such hollow drone, though it had the same sound level outside (and Berk's weren't connected with these tabs).

in case if it won't help, maybe I need to change my additional Moroso Spiral Flow resonators (installed between ART pipes and Borla) to something more efficient?

and what else can be done to reduce drone inside of the cabin? maybe some exhaust wrap, or sound deadening?

Motordyne

It doubt it has anything to do with the tabs. Its likely the interaction of all the exhaust parts. It may also be related to the changes made to the pipes but its hard to say. I haven't tested it like that.

harp00n

Well, yesterday my muffler mechanic inspected the exhaust and everything seems to be fine with the tabs (they are connected to the engine through the rubber, so I doubt they are the issue) and other components. The only thing he has found is a little leak between the driver's ART pipe and collector, I'll fix that leak soon, but it seems to add only a little rasp at the highest RPM's and not connected with the loud drone issue I have.

I understand that Borla is a very loud exhaust by itself and might did some drone with the stock catalyc converters but it was ok. And when I changed them with the Berk's HFC the drone and rasp became VERY annoying and I had to add Moroso Spiral Flow resonators. They helped that issue, decreasing the drone inside of the cabin and almost cutting the rasp I had.

Now, with the new ART pipes i still don't have any rasp , but the drone is really annoying under the load at 2000-3000rpm. I suppose, my additional Moroso Spiral Flow resonators can't fight such amount of drone, so maybe I should change them to something more efficient? Though I'm limited in the choice as they should be no longer than 15 inches and no fatter than 4 inches...

I started to think, as I already have dynamat materials in the rear of the cabin (rear sits, rear floor and subwoofer deck) maybe I should add some dynamat sound deadening materials to my trunk, as drone comes mostly from the rear, should I? And maybe I even should add dynamat to the front of the cabin (to the floor), as I feel drone a little under my legs too. Though I don't want to make my car too heavy after all those materials

Any other ideas how to reduce my drone?

MaDMaXX

As the ART pipes remove drone, i'd hazard a guess it's the rest of the system?

Easy way to check if it's the mounts, remove the brace itself, no need to remove the brackets, then go for a drive, quick and easy.

Motordyne

Yes, change to an exhaust system that has less tendency for drone. If it had drone with stock cats, it will drone with anything.

harp00n

Right now, I cannot afford a new exhaust. I can change my additional resonators though. Current resonators between ART pipes and Borla cat-back are Moroso Spiral Flow resonators, maybe someone knows something more efficient?

And I will try to put some dynamat anti-vibration materials in the trunk, it might help to reduce this drone...

P.S. The last hope is the Uprev tuning, I heard it changes the exhaust note a little and maybe my car won't be at the "drone RPMs" all the time after the tuning, like it tends to do now.

Motordyne

A tune has little effect unless it involves actual cam tuning.
As for the drone and the morroso spiral flow resonators, it may be difficult to know what to do without a lot of experimentation.
If the exhaust has a tendancy to drone, it may be tricky to fix.

AlphaSnacks

I bought a pair of exhaust tip plugs that are fit inside the tips. I'm getting a bit of drone anytime I touch the throttle at 2K-2500RPM as well, and it's began to annoy me. If the plug fix works, I'll let everyone know - because it's definitely not the ART Pipes, the drone is booming straight out of the muffler section.

Motordyne

Drone in an exhaust system has the same operational mechanism as a pipe organ tube.

The tubes of the exhaust system can resonate just like a pipe organ. The problem is there is only one note (or set of notes) that the exhaust can play. And this is why drone BOOMs at some RPM's (frequencies).

When the engine exhaust pulse frequency matches the exhausts natural pipe organ frequency the engine and exhaust sing together making one loud & penetrating note. DRONE.

The exhaust system must be designed to notch out that drone frequency. And that is why we use the side branch resonators on the axleback section of the Shockwave))).

The side branch resonator is tuned to 1.2X the natural frequency of the pipe organ. 1.2 insures the side branch will always be out of phase with the natural frequency and thus they cancel each other out.

AlphaSnacks

Tony, what is the quietest option of your exhaust? I'm curious what to order in case my little fix doesn't work out for me.