anthrax

Hey Guys,

I recently installed the Racing Beat Road/Race Headder, and had a custom exhaust system fabed by a local shop, the orginal system was way too loud, so I got the Racing Beat Presilecers and had them incorperated into the system, it is still too loud.

The performacne of the system is great, but it is way too loud.

Here is what the setup is right now:

Stock Port 12a, Racing Beat Road/Race Header, two Racing Beat Presilencers (One in each leg comming off the header), dual pipes over the Axal into a Dual Inlet/Dual Outlet SS packed Straigth through Magnaflow Muffler.

This is CLEARLY the WORNG Muffler of the applicaiton.

I know every one is going to say just order the Racing Beat Power Pulse muffler. I am trying to avoid that due to Customs, shipping, and exchange rates (it makes the RB Muffler about $500 CND.

Any ideas on what I could use to make this car atleast drivable?

I am willing to take the two pipes into one into a single inlet muffler.

Thanks for your help guys!

Anthrax

Dan_s_young

iTrader: (1)

I have to agree with you that getting the powerpulse muffler is a pain. Just a tip maybe try and get it from a rotary shop in Canada that is a Racing beat dealer. As far as I know the powerpulse is one of the best mufflers, it quites things down VERY well and lasts and lasts, I know its not really what you wanted to hear but most other mufflers won't last and will sound cheap.

anthrax

I appreciate that thanks Dan!

I looked into geting RB stuff form a Dealer in the Toronto Area and their price was crazy it ended up beeing cheeper, and quicker for me to order them form RB direct

hanman

I have the RB header that collects in to one, with a presilencer and a cheapie Pacesetter muffler. It is a little too loud for me, but liveable. Out on the highway it is fine, around town it''s just a little too loud.

saltyslug

Hey I was having the same problem in my 66 vw baja. I dont have enough room for silencers in the rear so I was gonna try a couple sport bike mufflers(dual exhaust). I will have to use 1000cc single can mufflers(2 of them)off like a gsxr 1000cc. We took my friends off his to replace his with a carbon fiber style and drove it for a minute without the can and it was really really loud, so the factory can kills alot of noise. It being 4 valves per cylinder and able to rev to 12000+ rpms will hopefully be enough flow for a stock port 12a which is what I have also. Also the heat is pretty severe being it is only 3-4 feet from the engine so hopefully that will be ok as well. Hell it might even sound cool as hell also. Please let me know what you guys think, good luck and thank you.

rxtasy3

iTrader: (2)

if u want it quiet, u HAVE to use what u already have with their PrimaFlow muffler. i have the streetport setup on a 13b also ported. i know how loud this thing was when this friend had it in an rx4. i was very surprised to hear how my quieter it is. i guarantee u'll like it. IMO, racingbeat's system is the best one for a rotary engine for performance AND sound reduction for those that need it.

anthrax

Its not so much quiet I am looking for as much as...

Not Ear Bleeding Loud.

If I drive the car around town for a bit I get a head ach...

Does Any one know what the RB muffler is like inside?

Is it traight through or baffeled, or some other designe?

Thanks again,

A

Rotor13B

I don't know what the internals look like, But it is fairly quiet when normal cruising. It's when you step on the loud pedal that it makes you grin from ear to ear.

Oh, And I also have the Complete RB SP system.

FB II

well, what i did to quiet mine down was run two magnaflows in line. one before the axle and one right after. wasnt hush hush quiet, but got rid of the insanity of it. i really liked the sound of it. and you barely heard it at idle.

evil_motors

iTrader: (3)

i like the loudness...

tjgosurf

cheapo 4.95 muffler on ebay!

RustyRotary

iTrader: (2)

RB is just right for normal driving, though I'm dying to get one of those remote exhaust switcher things. That way any time I feel like being loud all I have to do is press a button and it switches to straight pipes

A few weeks ago I took the muffler off (presilencer still on) and I tore it up on a local road right by my house for about 3 minutes then quickly went home and stowed my car in the garage. Not 2 minutes later the po showed up and they cruised around for at least a half hour waiting for me to emerge again

SS124A

you guys are missing some things here.

First off,
no matter how much muffling you put into an exhaust system there is still alot of external noise attributed to the actual exhaust tubing being used. there are 2 portions to this. most importantly is the tubing gauge. The minimum I would ever use is a 13awg... however, i prefer to stick with the 11 awg/.120 wall tubing. If you are experiencing a "tinney" or "metallic-ey" noise, this is your issue. the tubing is resonating your exhaust pulses as noise...

also the diameter, smaller diameter tubing is being required to flow pretty much the same amount of air, through a smaller aperture. therefore these noises seem louder.


Next, TYPICALLY

shorter primary length exhaust systems are quieter.
longer primary length exhaust systems are louder...

let me ask, and don't take it the wrong way.... but what in the hell would you want a really long primary set-up on a STOCK port 12A?

here is my suggestion. take it step for step, and you can thank me later.

go dyno your car as is.
post the numbers...

remove all your exhaust ****, (keep the header)

order the full exhuast system from ISC racing
http://www.iscracing.net/exhaust.htm

I wish i would use its full system on my car.... the quality is top-shelf, price is more than reasonable... it is still loud, but in a deep rumbling sort of way... not a loud ear piercing tinney thing.

I am using their center section.. but unfortuneatly the rest of the set-up does not fit my chassis. after spending alot of time designing, building, testing tuning various exhaust systems over the years.... this is a great unit.... it scavanges great, and the expansion chamber they have layed out is proven. yet, it isn't so large in outer diameter that it scrapes the ground... (unless you are my friend Rob on his full g-force suspension... ) i wish i could find the pic I took looking into the out-let.

once you have installed this set-up go dyno the car again.

you'll find more peak hp, your power band will begin sooner, and you'll have an even broader, flatter torque curve.... a much better driver, and racer.

Rotor13B

"We" aren't missing anything. It was already explained that to run the RB system quit he had to have the PowerPulse muffler. He (original poster), Through trial and error pretty much has everthing he needs to complete the setup except said muffler. I realize the what you say about exhaust tubing thickness, But this isn't the problem with the RB system. The problem is people trying to cheap out and use other mufflers and in the end they either have to live with the noise or get the RB unit.

kuhlrx7

to quite things down you will need to use a y to bring the system in to one pipe before the rear end then use a muffler that is one in and 2 out with resonator tips at least 6 inch long, for a muffler look at an elderbrock rpm model they can with stand the heat and the design of the inside will help with the noise. I do not think it will be much cheeper though.

anthrax

I hardly say I was trying to cheep out I wanted a custom system not some bolt on...

I am not unwilling to get the muffler I just wanted to see what other people have had success with.

If there is something I can get localy in my area that will do the job (ie form some internationally marked manufatuer) I would like to do that because mail order nearly doubles the price.

The muffler I put on was not some Wal-Mart POS and I am not some 16 year old rolling around on flour of my garage either. I took the car to a reputable exhaust shop that specializes in custom exhausts, he just does not see to meny Rotory powered cars becasue there arn't too meny in my area

anthrax

I have been thinking about taking the two pipes into one over the axel I was not sure if that would make a difference or not.

Thanks for the help guys

MosesX605

You DEFINATELY want to collect the pipes before the rear axle. Not only will it be quieter, but you're losing whatever low end the 12A had with some very dubious high end gains in return. I've got the RB single outlet header to a mini presilencer, which goes to another bottle silencer and then into my Magnaflow muffler. The result is a system that is very tame around town. I had it decible tested (at the request of the police) and it passed, but just barely. 85 dB at 3000 RPM at a distance of six feet from the muffler.

Aside from the noise, I get a good power increase without sacrificing much, if any, low end grunt from my 12A. I know some will scoff that low end isn't useful, but you do the vast majority of your driving below 4k RPM in the city, and sacrificing low end means more revving and more fuel consumption. Everything is a tradeoff, and I think my setup is probably the best for a dual use street/solo vehicle.

anthrax

That is Excelent information Thansk MosesX!!!