Afternoon gents
I have a question that I hope someone can answer me. What, in an exhaust system, conclusively provides the best sound attenuation?
Background: I've joined the Formula SAE team here at my university, and we are well on the way to completing this year's car. Unfortunately, the exhaust is too blasted loud. The largest muffler we've built has been measured at 116 dBA (I can put up the specs for it, if you guys want to do any math,) and ideally we'd like to drop a solid 10 decibels.
You guys are the best option I can think of for some solid math to figure some of this out. Thus far all of the info we've gleaned is going to amount to a lot of small changes (for example, running too rich adds a couple decibels), but I can't help but think that we've ignored something major.
I realize I haven't given a lot of info to go off of, but I want to talk general info before we start talking specifics.
http://students.sae.org/cds/formulaseri ... _rules.pdf
Page 84 of the rules outlines the requirements for the exhaust measurement
Our particular engine is a Suzuki LTR-450, and gets tested at approx 7500RPMs
I have a question that I hope someone can answer me. What, in an exhaust system, conclusively provides the best sound attenuation?
Background: I've joined the Formula SAE team here at my university, and we are well on the way to completing this year's car. Unfortunately, the exhaust is too blasted loud. The largest muffler we've built has been measured at 116 dBA (I can put up the specs for it, if you guys want to do any math,) and ideally we'd like to drop a solid 10 decibels.
You guys are the best option I can think of for some solid math to figure some of this out. Thus far all of the info we've gleaned is going to amount to a lot of small changes (for example, running too rich adds a couple decibels), but I can't help but think that we've ignored something major.
I realize I haven't given a lot of info to go off of, but I want to talk general info before we start talking specifics.
http://students.sae.org/cds/formulaseri ... _rules.pdf
Page 84 of the rules outlines the requirements for the exhaust measurement
Our particular engine is a Suzuki LTR-450, and gets tested at approx 7500RPMs