Racing Beat's Single Outlet Race Exhaust System - Page 2

02-14-2005, 11:31 AM

#26

clyde

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Quote:

Originally Posted by Imp

Ahh... missed that when I went there this morning. Just a one line blurb about it. Got it.

Thanks!

I await this unit with open arms and a heavy foot. It sounds like an auto-xers dream. Lighen up the car, and keep the sound within the legal limits at most venues. If it gains HP? Even better... but that's not a 'big' deal for auto-x stock class.

Whoohoo!

--KC

You.

Go away.

:p

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02-15-2005, 01:23 PM

#27

Racing Beat Inc

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Jim Mederer has designed several sets of headers for the RX-8, and he used all of his common "tricks" in the various configurations, but none of them produced notable gains. Again, Mazda has done a pretty good job with the design of the stock manifold.

I thought that the removal of the cat did yield some gains, but it has been awhile since we outfitted a project car with this set-up and I have forgotten the actual numbers.

Jim L.
RB

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02-15-2005, 01:45 PM

#28

brillo

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Jim,

is it possible to introduce a silencer into the muffler to get the sound down slightly without hurting the gains?

is this unit a true cat back? is the 12lb savings on both the muffler and the back piping?

Last edited by brillo; 02-15-2005 at 01:47 PM.

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02-15-2005, 02:20 PM

#29

Ft Liquordale

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Quote:

Originally Posted by Racing Beat Inc

respectable power gains over the stock and REV8

I know you said no exact numbers, but I think everyone would like to know what to expect. So I'm not looking for exact numbers, but I'm very interested in the meaning of "respectable power gains." All the other exhausts seem to add 10-20 HP tops with a race pipe. Does respectable gains mean 20-30 or 30-40.

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02-15-2005, 06:23 PM

#30

rotarygod

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Quote:

Originally Posted by Ft Liquordale

I know you said no exact numbers, but I think everyone would like to know what to expect. So I'm not looking for exact numbers, but I'm very interested in the meaning of "respectable power gains." All the other exhausts seem to add 10-20 HP tops with a race pipe. Does respectable gains mean 20-30 or 30-40.

I e-mailed Jim about that since I was confused by it. According to their website, you only can get about 4 hp or so from completely removing the muffler whereas the REV8 system gives about 3. I was wondering what does "respectable" mean and how can it be any more than the REV8 system if there really isn't any more potential? His response back to me made a little more sense. Apparently he either typed something up wrong or we misinterpreted it because what he meant to say was that there is a respectable gain over stock. He never gives a number because he knows the word to be subjective to interpretation. He generally considers 3-4 hp to be modest or respectable in regards to the RX-8 exhaust. It may or may not gain any power over the REV8 system. It's advantage is for racers who need every little bit of help. It might make another hp or so but it's advantage is in it's simplicity and lightness where every little ounce of weight counts. It is also louder. Do not expect any miracles in the power department.

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02-15-2005, 11:11 PM

#31

Zaku-8

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how suited is this exhaust for turbo rx8's?

also generally, does the addition of a turbo reduce noise outputs, and if so, by how much?

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02-15-2005, 11:50 PM

#32

Fanman

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Quote:

Originally Posted by Ft Liquordale

I know you said no exact numbers, but I think everyone would like to know what to expect. So I'm not looking for exact numbers, but I'm very interested in the meaning of "respectable power gains." All the other exhausts seem to add 10-20 HP tops with a race pipe. Does respectable gains mean 20-30 or 30-40.

I think you have been fooled by manufaturer's claims. It is a proven fact by many dynos from the posters on this board that the gain from the cat back are minimal, about 2-3 hp. Even with a "race pipe" It is onlt in the 10 hp range. You are not going to get another 10-20 hp from a single outlet exhaust. Maybe another 2-3 hp but that is about it. They/Racing Beat did a test where they removed the mufflers all together & got 4-5 hp, so massive gains are unrealistic.

Zaku-8,

On my turbo I got the Racing Beat cat back and that was just about perfect for me. The sound was lower but louder. I added the SR Motorsports hi-flow cat unit (w/resonator) & it got louder, to the point where I was a bit annoyed. Not unbearable but definitely louder. I was going to dynamat the bottom of my trunk to cut some of the exhaust noise. But now that I have my turbo on it has literally sounds like when I was stock. Not even as loud as when I just had the RB exhaust on. I don't mind. It was getting annoying during long trips...maybe I'm just getting old

.

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02-16-2005, 02:14 PM

#33

ULLLOSE

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Quote:

Originally Posted by Racing Beat Inc

Several autocrossers presented the idea of a Race Muffler for the RX-8 to us. They wanted something that was 1) lightweight, 2) met the 92-93 db limit that is imposed on the auto cross course, 3) and made more power.

This really isn't intended as a "street" muffler, although it can certainly be used for that purpose if you want. Eliminating the second outlet, tips, and reducing the system to a single outlet offered substantial weight savings. We fabricated a prototype and ran it on the stock Renesis engine on or dyno and obtained very respectable power gains over the stock and REV8 system.

The sound level increase is certainly noticeable, however it is not objectionable. From inside the car the sound level is increased, most noticeably around 5000-6000 RPM, then the tone moderates at higher RPM. From outside the car, you can definitely hear the RX-8 coming and going, but it has more of a "tuned-V6" note than anything harsh or buzzy. Our initial sound level tests with the db meter proved promising. We intended to test the muffler on the autocross course this coming weekend, but it appears that the weather (and our test driver) may require that we push it back a week.

Since this intended primarily as a race unit, we do not intend to offer any type of “cover” for the second muffler tip opening. If you want the ultimate no-frills performance exhaust for your RX-8, this will be definitely worth considering. If the testing goes as planned, we are looking at further reducing the weight of this unit as we continue the development of this project.

Let me know if you have any further questions, however I can’t give out any “numbers” unit we get deeper into the project.

Jim Langer
Racing Beat

A few weeks ago I did a run in a RX8 in SD that has a single exhaust built by Tri-Point. With a helmet on I wanted to stick my fingers in my ears, it was loud. Also the tone from 4k-6k was so bad. This set up is also right on the limit, it has hit 93.2 db once and the rest of the time is just under. Do you have any pics of your system? I would like to see how it differs from the Tri-point system. They used a 12" Borla XR-1.