Xacto
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This one is one of the aspects of the 1 GR-FE that truly sucks, and to those of us first gen owners, was a bloody nightmare to deal with for awhile before the answer was discovered.
Quite nicely, the solution is as easy as salt and pepper to a steak.
Simply weld in place an 18 inch resonator that is a straight through design, or a muffler with packing that is the equivalent volume, directly after the y-pipe to one pipe flange. This should eliminate your rasp, even with DTLT's. I mean, it did for me and i wasn't even running a muffler. :laugh:
The system I had when I first discovered this was an Intake, DTLT's, URD Y-pipe, magnaflow catback with an Aero-turbine muffler in place of the magnaflow muffler. This setup was so ****ing loud, and at low low rpms the low frequency tone was so loud it would literally rumble cars next to me like a pair of 13 W7's. Only problem was with 1/4 throttle or more, between 2.5k-3.5k rpms, there was this total fart can filled with pop rocks sound - like a chainsaw shitting tiny pebbles.
Keep in mind that the aero turbine is about as wide open as you can get, no packing or anything, just an air foil.:
http://www.youtube.com/watch?v=iDTTOa77efs
Meaning that the level of sound deadening was, well, borderline non-existant, So i was running straight pipes essentially.
Well, when I first went to the exhaust shop I had an 8 inch Aero-turbine resonator welded about a foot down wind of the y-pipe to one pipe flange. It helped, but the rasp was definitely still noticeable. About a month later I had that resonator taken out and replaced with an 18 inch magnaflow resonator, this one to be exact:
http://www.mandrelexhaustsystems.com/servlet/the-148/ADD-ON--dsh--RESONATOR/Detail
Most importantly, it was welded in an inch down wind of the y-pipe to one pipe flange, not a foot, not two feet, one inch. Fired her up, took off, ZERO rasp, not even a hint!
I suspect it has to do with the acoustics of the 1 GR-FE combustion characteristics along with the exhaust design. Some thing about the two to one point creates a harsh acoustical wave form resonance at those specific rpms under greater throttle position.
Good luck fixing your crappy sounding vehicles.
Quite nicely, the solution is as easy as salt and pepper to a steak.
Simply weld in place an 18 inch resonator that is a straight through design, or a muffler with packing that is the equivalent volume, directly after the y-pipe to one pipe flange. This should eliminate your rasp, even with DTLT's. I mean, it did for me and i wasn't even running a muffler. :laugh:
The system I had when I first discovered this was an Intake, DTLT's, URD Y-pipe, magnaflow catback with an Aero-turbine muffler in place of the magnaflow muffler. This setup was so ****ing loud, and at low low rpms the low frequency tone was so loud it would literally rumble cars next to me like a pair of 13 W7's. Only problem was with 1/4 throttle or more, between 2.5k-3.5k rpms, there was this total fart can filled with pop rocks sound - like a chainsaw shitting tiny pebbles.
Keep in mind that the aero turbine is about as wide open as you can get, no packing or anything, just an air foil.:
http://www.youtube.com/watch?v=iDTTOa77efs
Meaning that the level of sound deadening was, well, borderline non-existant, So i was running straight pipes essentially.
Well, when I first went to the exhaust shop I had an 8 inch Aero-turbine resonator welded about a foot down wind of the y-pipe to one pipe flange. It helped, but the rasp was definitely still noticeable. About a month later I had that resonator taken out and replaced with an 18 inch magnaflow resonator, this one to be exact:
http://www.mandrelexhaustsystems.com/servlet/the-148/ADD-ON--dsh--RESONATOR/Detail
Most importantly, it was welded in an inch down wind of the y-pipe to one pipe flange, not a foot, not two feet, one inch. Fired her up, took off, ZERO rasp, not even a hint!
I suspect it has to do with the acoustics of the 1 GR-FE combustion characteristics along with the exhaust design. Some thing about the two to one point creates a harsh acoustical wave form resonance at those specific rpms under greater throttle position.
Good luck fixing your crappy sounding vehicles.
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