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RoadsterSport Helmholtz Race VS Other RoadsterSport Singles?

Posted: Thu Mar 28, 2019 10:08 am
by MereMortalSammy
I currently have a RoadsterSport Street Single attached to the GWR (cat+resonated) midpipe and Tomei Expreme catless header. Really curious about the sound of the new Helmholtz race and how it compares to the Race and Street single.

I'm thinking about buying the Helmholtz to replace my Street single. I'm looking for something a bit louder then then street single. Is the new exhaust between the race and street or quieter than it's counterparts?

Re: RoadsterSport Helmholtz Race VS Other RoadsterSport Sing

Posted: Thu Mar 28, 2019 10:35 am
by Brian
Yes and no. The Race Helmholtz is both louder at full throttle and yet more quiet at cruise thanks to the Helmholtz chamber knocking out a lot of sound in the 120 to 130 hz range. The Helmholtz neck that is the valve in which essentially you have an air piston is speed sensitive so that at light throttle it makes things more mild, but as gas velocity increases with more throttle it suddenly wakes up, much like a mechanical exhaust valve but without need for the valve.

Re: RoadsterSport Helmholtz Race VS Other RoadsterSport Sing

Posted: Fri Mar 29, 2019 5:03 am
by BillK336
Ah. NC item. Got a little excited there for a moment.

Re: RoadsterSport Helmholtz Race VS Other RoadsterSport Sing

Posted: Fri Mar 29, 2019 10:18 am
by Brian
BillK336 wrote:Ah. NC item. Got a little excited there for a moment.
Working on something new for ND as well, but more months of work on it before it gets anywhere.

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Re: RoadsterSport Helmholtz Race VS Other RoadsterSport Sing

Posted: Fri Mar 29, 2019 10:28 am
by KevinB238
I don't suppose the new HH Race muffler was included in the shipments that showed up today, was it?! I can't wait to get mine on.