fuzzi

actually i have been doing tonsa research guys.... and i was thinking of even maybe going with the dynomax ultra flow, or a dynomax super turbo... any suggestions on that .... would a single ultra flow be too loud on a ported rotary? how would it sound with the dual exhaust that i have now ?

Evil Aviator

That's because you have a turbine wheel blocking out half of your exhaust flow when on-throttle.

flubyux2

dude, did u like NOT hear a word any of us has said?

NO dynomax. no glasspacks. No flowmaster.

one, dynomax uses reverse flow techology, AND has fiberglass packing.

the ONLY muffler that will be suitable for Rotary cars/trucks, are Baffle-ized mufflers like the Original equipment. or stainless steel packed mufflers.

Apex N1, Dunk, Arospeed Bombs and stuff like that are Least restricitive, and are packed w/ a stainless steel mesh instead of fiberglass. they mellow out the sound, make it deeper, and not so ricey. and its not as raspy at all.

you need to purchase a Rotary specific or rotary-safe equipment. our cars arent like civics, these are race bred cars. so you cant expect to used parts that are meant for plain ***, lame *** consumer oriented vehicles.

chris

Brian P

Ok, some people on this forum are on glue. OK, flowmasters don't have ANYTHING in them to blow out, they quiet exhaust with BAFFLES inside. Soundwaves cancel each other. Dynomax ultraflo's are a full stainless muffer with a straight through design, also a LIFETIME warrenty.

Every rx7 race car around here is running an ultraflo on it. I've had one on my t2 for like 2 years now and its great. My cousin had one on his t2, they are excellent mufflers.

I don't think that you can say that they aren't free flowing. Most ultraflo mufflers flow between 800- 1000+cfm. Flowmasters aren't that great, I'll give you that one.

Glasspack mufflers do blow out quick in some situations, but if its a pre-silencer it doesn't matter. It still does exactly what you put it in there to do PRE-SILENCE even with nothing in it, it still works. They shoud never be used as a muffler. But that's not what he's doing. Maybe you need to re-read what he is saying.

MaxRX7

I guess he might be looking for cheap mufflers for like $100 or less.

Like goto Ebay and search for Naxos, Blitz, aerospeed, etc.

would those "straight through" mufflers last on the rotary ?

MaxRX7

http://cgi.ebay.com/ebaymotors/aw-cg...item=596646879

http://cgi.ebay.com/ebaymotors/aw-cg...item=596724501

flubyux2

Brian, when i spoke of baffles, i had the OE baffels in mind. they block off the whole path, and force the exhaust gas to disperse and pass through a groups of ( ) holes that big in each baffel. i have cut apart my OE mufflers and didnt like what i saw. also, no packing in the OE stuff.

im not familiar w/ the straight through Dynomaxs. i havent seen them used on a car here. and i dont thikn he was initially talking about the ultraflow, i suggest YOU reread the original post. he was askin about Turbos. turbos utilize reverse flow technology, and have glass packing between the tubes.

BTW, a presilencer w/o any silencing properties (IE; fiberglass packing) wont silence anything. thus, it is NOT doing its job: pre-silencing. thats like saying my gutted pre-cat is doing a nice job of pre-silencing cuz its in the same location, and has no packing in it.

Arospeed mufflers do hold up, and dont blow out. i had one on my car, and it sounded awesome, gave it a nice look too. just like an Apex N1, only the tip doesnt extend out as far. also, it has the stainless steel packing, as opposed to fiberglass, so it will last longer. and i got My Arospeed for 100 bucks, brand new. with the baffel.

chris

fuzzi

i was asking orginally about the dynomax ultraflow, and the super turbo, like brian was referring to. Sorry if i was unclear with my message. The reason i was even thinking about the dynomax super turbo's was because they have an s-turn. This will help substantially dampen the sound, but at the same time allow me reasonable flow in a dual exhaust system. i was just seeing if anyone had tried them and knew the results. Apparantly the dinomax works on brians t2 and his cousins t2. I wonder how much louder it will be with the absence of a turbo, and a street port... hmm so many factors !!

RX AGENT

Why no dynomax?

Evil Aviator

Hehehe, nice theory, but in actuality an NA rotary engine will pop the spot welds on those Flowmaster baffles. No, they don't get literally blown out of the car (or at least I've never seen it), but after some of the welds let loose the baffles get bent and rattle around, and of course the car gets pretty loud, totally defeating the purpose of the muffler.

Um, if the glasspacking is for noise reduction, and the glasspacking gets blown out, then how do you figure that it still does exactly what it did before?
OK, somebody take that glue away from Brian.

Icemark

That and remind him that the T2 is only as half as loud and half as hot as a open exhaust NA...

T2s got that nice baffle style muffler up front that spins and helps make more HP.

flubyux2

yea, what they said.

No more glue for You!

id like to get one of those spinny-type baffle mufflers to quiet down MY n/a. hehe

sorry Fuzz, i thot you were only thinkin of the Dynomax turbos. some how, i dont think the idea of reversing flow on exhaust is all that great of an idea. i mean, i do have those on my K5 blazer, and it sounds AWESOME, like a boat out of water. but thats a V8, not a rotary. it just seems to me like the idea of reversing flow is illogical.

the part about the spot welds being broken by our NA's sounds completely possible to me. cuz, EVERY time i granny shift my car, and give the engine a chance to drop revs by it self, it Backfires, like clockwork. it sounds liek a gunshot. and i dont think those explosions in the exhaust pipe are very helpful to the life of a Flowmaster. they were designed for relativily tame non-rotaries that arent as Hott, or explosive.

i am SERIOUSLY recommending an Apex N1 universal, or an Arospeed bomb, and if u REALLY have to have something domestic, get the Ultraflow. at least the N1 and the Bomb can be tuned down to make them quieter. i dont know if the Ultraflow has that feature. a Dual N1 set up would look great on your car. although, its Very expensive, just under the $700 mark for the catback. Arospeeds...are VERY similar in every aspect, except price. mine was $100. know what im sayin? and if i ever need to, i can plug it up w/ the baffel, and make it quiet. but, to each his own.

chris

fuzzi

thanks ... im gonna take a look at those arospeed you mentioned... do they run better through a single exhaust or a dual??? what kinda flow rate... i need some back pressure if its an N/A so dual exhaust might be overkill with something like that ?? I dont know if a single will be too loud or what....??

MasteRX

This is what I was about to say. It is probably the best system you can get for the least amount of money.

fuzzi

im not big into buying a cat back system... they are rip off's i can get a shop to make something way better for a fraction of the cost.. I know the guys who work at some of the local exhaust shops so i can get labor for like a case of beer ! ... I can get just some straight pipes slapped on from my header... and get way better results then i would with one of these cat back systems... thanks for the advise though...

flubyux2

hey FUzzzball,

check it out, you can do what i did, and have a full exhaust for...about...170 all said and done.

100= Arospeed bomb
20= 10' stick of 60mm aluminized pipe
50= for labor.

since you can get the job done for a case of beer, we will call it... 12 bucks.. Natty Ice oughta do the trick, hehe. so heres what you do:

i didnt put a header on mine, cuz, i didnt think it would make that big of a diff. besides, it would be more work since the flanges are different than the OE stuff, i think.

i gutted my #1 precat, and bolted that to the manifold, drove it down to the shop, they took my 10' stick of 60mm (which fits nicely in the car w/ the hatch closed) and they bent it up, hung it, installed my Arospeed, and gave it back. the most radical bend in the entire pipe is like 20* angle, IF that. its a VERY straight and free flowing exhaust. like i said, it sets off car alarms just from driving past.

but, my exhaust still LOOKS legal cuz i have a cat on it. and, if i ever need to, i can unbolt my new exhaust, and reinstall my original one, and pass emissions.

id say it flows probably 1500 cfm, i mean, its 60mm inside diameter, w/o any baffels or louvers impeding the exhaust flow. its the next best thing to open header. id say, the only advantage and open header has over my exhaust, is the weight savings. and, the only reason youd need backpressure, is to operate your 6PI. and thats only 1.8psi. but, just do what im gonna do: configure your now-useless AIR pump, to provide the air pressure to operate the 6PI. since you got no cats behind youre header, ur AIR is useless. if u need more info, i can help you.

chris

Jahoo88

I have a manifold --> 2.5" straightpipe --> magnaflow 2.5" x 14" single.

It hasn't burned out yet and i blow flames all the time. Sounds fairly loud but high pitch noise has been cut down a lot, no more raspy noise.

How can i tell if the muffler burns out? Its been fine for 3 months now, 3 months of hard driving.

fuzzi

flubyux2 : Where do i buy Arospeed ?? I checked out their webpage... does anyplace online sell them.. im not sure where i can get that here in canada ?? you know any auto part stores off hand that sell them ?? thanks

MaxRX7

flubyux2: but how LOUD is it compared to an RX-7 with another "catback" (idle, aroung ~4k RPMs, redline ???), I'm planning to run a single st. pipe from the presilencer to a $100 muffler. How is the Arospeed holding up ?


fuzzi: check my previous post, EBAY !

PraxRX7

Can't go wrong with racing beat

flubyux2

yea, well Racin beat is good ****, but not really good for us budget racers.

well, its hard to tell, but if you knock on urmuffler, and it sounds hollow, and it echoes inthere, its a good chance all the packing is gone.

well, my Arospeed is as good as it was when i first installed it, the only diff is, the carbon/oil resin coating the inside of it. and road grime on the outside. the way to get that **** off, is boat wax. that stuff that u use to clean the gelcoat on boats, took all the oil resin off, and shined up my muffler good. also, around town driving, is REALLLLLY loud w/ the baffle out, but its not ricey, its VERY deep. the only thing more deep, is a 454 chevy w/ a solid lifter cam. like i said, theres a camaro here at my friends apts. and i ALWAYS set off the alarm whenever i drive by it. if the camaro is less than 4 cars away, ill set off the alarm just by starting my car. trust me, it sounds REALLY good, especially when you get the gurgle when you coast in gear. parkin garages are the BEST, you can hear how great the car sounds too.

i got mine from a guy in long island NY. i bought 3 at the same time tho. he charged me $95 USD each + $5 USD for shipping and handling each. in the end, they were $100 each. the cheapest you can find them online, is about $180 USD. if u need one, let me know. i can probably get you one for cheap. maybe 2 for cheap, so u can have duals. duals shouldnt be as loud as my single was.

also, this muffler isnt raspy at all. theres no harshness, or buzzy sound to it like HOndas make.

BTW, a guy in a riced out Escort w/ a DTM muffler complimented me on my exhaust. he said it sounded Goooood. and, just incase u were wondering, a Escort w/ an exhaust sounds like a honda...go figure.

chris

MaxRX7

that is EXACTLY what I am after. Can you check the model name/# of the muffler and let me know. It should come with the "baffle" right ?

Thanks !

flubyux2

its an Arospeed Bomb series, tunable muffler. straight cut tip.

it looks JUST like an Apex N1.

ARO917001 - 4" Round Tip Bomb Muffler

this is what i had on my car.

this one would also look good, i think

ARO917002 - 4" Round Angle Cut Tip Bomb Muffler

when you get it installed, make sure that the end of the tip sticks out PAST the cut out in ur bumper, otherwise, the turbulence created when ur car moves thru the air, will pull the exhaust up, and probably into your car. mine didnt stick out far enuf, and when ever i turned on the heater/ac, i could always smell the exhaust.

chris

Edit; YES they should come w/ a baffle, mine did.

MaxRX7

thanks Chris you're the best

flubyux2

no prob bob...er, Max. i do what i can. good luck gettin a Phat *** exhaust.

chris