NSXchink

im running the ss autochrome turboback.. obviously i got a ticket with the silencer out..
should I
A) slap some new muffler, and add a resonator, or cat?
or
B) get the RB turbo back..

i would prefer A.. but if i have to i will go B

will choice A make it tone down to the quietness i want? ot not get pulled over..
thanks for ur input

ikekrull

I have a 3" pipe from turbo -> resonator -> y-pipe -> 2 x 2.5" pipes -> 2 x 3-pass mufflers on my FC and its not that much louder than stock at idle. It flows more than I can throw at it, and while it drones and blares really loudly i'm pretty safe from the cops since all i have to do is drop it in neutral and it goes back to purring like a kitten...

So yes, you can muffle the **** out of it with resonators and mufflers, but if its a single pipe, you're probably going to sacrifice some flow by making it quieter - with a dual-muffler setup you get twice the muffling with half the flow which is definitely the way to go for a street FC IMHO.

NSXchink

hey, yes my exhaust is a single pipe
what would it take to take out most of the noise, i really want a decent free flowing exhaust
which would quiet the exhaust tone more, adding back a catalyic converter, or a resonator? would putting 2 resonators make a difference than just one?
obviously i will have to change the stock muffler, i was thinking of fabricating the Borla HUSH exhaust, anyone ever heard of it?
here's a pic of my exhaust system

iceblue

I would hate to see you have to ditch your good exchoust that you paid good money for b/c of some ***** *** cop. The ? is do you want a straight threw design and look of the SS or do you like the muffler and tip style of the RB? Perhaps you can try a SS Y pipe and another muffler b/c they do offer a dull cat back and if this is still to loud you can add a muffler in the exhoust somewhere. But I wouldent ditch my setup I like that I want b/c some cops is an *******.

RotaryEvolution

iTrader: (30)

i run mine with the resonator in when i'm driving normally but if i plan on needing the extra UMPH i pull it out and run free flow exhaust, i have the SSAC setup too and it is loud as a **** without the silencer but it flows great. i plan on replacing the resonator with a Borla resonator, should quiet it down some, least hopefully enough to not attract as much attention as it does currently.

ProjectRE

go with GP Sport

http://www.we-todd-did-racing.com/w...kZmQzMXk1NDE%3D

RexRyder

iTrader: (10)

link is broke. went to http://www.we-todd-did-racing.com/. it's broke also.

igottafc

iTrader: (6)

i have the ss Turboback too, and my silencer never made my car any quieter. Im planning on getting the rb Presilencer or a highflow cat. Did your ss run your car noticably richer at all? thanks -alex

NSXchink

i love the look of the SS, but to everyone's eye, oooo big canister muffler= loud *** exhaust, blah blah
now the SS without the silencer is freaking loud, but man it feels so good to accelerate with no restrictions really.. you can feel the turbo spool up much quicker..
I like the style of the RB turbo back cause it looks stock, and not that noticible.. and it's quietness, i have heard it before, its not that loud, but loud..

I dont think i want to go through all the trouble to making it a dual muffler system

but seriously, the ss autochrome is very noticibly loud, you can hear that atleast 1 mile away lol when yuo step on it..
i love the sound, power, and feel of the ss autochrome exhaust system.. but i live in a stupid commonwealth state, and they all are ******..
so.. im still debating..
to get a Borla Turbo XL muffler, and add a stock looking tip, and add a resonator to it too
or get the RB... decision, decisions, all your opions are greatly appreciated..

1987RX7guy

iTrader: (3)

I vote for RB turbo back. Stop buying junk and step up to a good system.

I don't know what your car is putting out but i'm sure most of the people here dont' have motors that can outflow an RB turboback.

NSXchink

do you know leaving that silencer in goes against the turbo, and is not that good for the engine.. obviously you feel the big difference, and i feel it hesistate so much when the silencer is in, but it's pretty quiet

i want an exhaust where i don't have to put the silencer in, free flowing, and quiet, that doesn't go together, huh? lol


"i plan on replacing the resonator with a Borla resonator"
do you mean that presilencer looking piece that connects to the midpipe(pipe that goes to turbo), i dont think it really did its job making it quiet lol

NSXchink

really, it is still loud with the silencer, but way quieter with it in than out lol
i heard you can't put the RB silencer on the ss autochrome set up, or can you?

yea im sure it ran WAY richer, because I pop flames left and right lol

NSXchink

well see i calculated my options and they are
A)
already have SS autochrome turboback $250
to get a Borla Turbo XL muffler (3" in, 2.5" dual exit), $268
and add stock looking tips, $150
add a resonator to it too borla or mangnaflow $80
labor/installtion $80
whopping $828

B)
or get the RB $800... decision, decisions, all your opions are greatly appreciated.. hm..[/

Bukwild

get the borla xr1 oval and put it where the main cat should be and it will tone it right down to a v8 ferrari purr

Peruvianrx7

iTrader: (25)

blah i have the quietest fc single 6 port n/a.... ONE WORD.... TURBO RESONATOR 2.25 inlet extended to 2.5 inlet and outlet... the air restriction gives it a quiter yet deep as hell tone. only like 30 bucks at u rlocal muffler shop

1987RX7guy

iTrader: (3)

If you're going to end up paying the same as an RB turboback just BUY the damn thing and sell your old one.

ProjectRE

http://www.we-todd-did-racing.com/we...ZmQzMXk1NDE%3D

Node

iTrader: (1)

you need at least a resonator (inline muffler) or a cat to go between the downpipe and catback. This will make a huge difference.
But that entire setup is just very loud. The catback too!

If you want to look and sound stock but be able to hear your exhaust then go RB.
You might want to try putting your stock cat back on and see how that helps. This will give you an idea of what a presilencer could do for the noise of your exhaust before you totally scrap it.

iceblue

Your views on exhoust and gas performance are quite scewd. Ok here we go. The exhoust does not make your car run richer or leaner. Ok now that we have that cleard up lets see how we create a performance exhoust.

There are 2 dependancys here. AIR coming into the engin and AIR coming out.

Lets use a pipe for an exsample. Take a 5in pipe and at the other end lets make the pipe 2in. Now put the 5in side to your mouth and blow. How much air are you able to force therew the pipe? Well lets try a bulged pipe where both inlets and outlets are 2in and in the midle of the pipe is blown up to 5in and now lets blow in it. How much air can you flow?

The awnser is simple You can not flow more air then you can let in or out. So my flow rate or CFM's of a 5in pipe with a 2in outlet is exsactly the same as a 2in pipe.

So how do we know what type of exhoust and size to get? RND! First step is to finde the maximum amount of air you can flow into the engin "turbo = more" and then how much can you flow out of the exhoust. The lowest # recived is your maximum capcity. Now you must flow test a exhoust setup. What shapes and exsact sizes = the amount of CFM bench tested from the motor keeping in minde that mufflers and bends decress your capacity to flow.

Now we allso have to finde out how much back presure is required for optimal performance. You MUST have back presure.

This now must be considerd when RND is preformed for the setup. On a performance race engin both intake and exhoust ports are matched to flow rate and exhoust.

This is why such setups as Racing Beat are so exspencive b/c they have taken this factor in minde and designed a exhoust for the aplication unlike greddy or apexi might have done.

The only time you will see fule changed is by not allowing the proper amount of air out or in. If your car flows enugh CFM's for a 3.5in pipe straight through and you use a 2in you will be restricing the flow.
Now if you tuned the car for this setup and then place a 2in on there you will be running rich. Why? B/c you are flowing less air through the motor then what it was tuned for. If you place a biger pipe then its exsact CFM matche and tune for the CFM of the motor and put a bigger pipe on your car it will run rich. Evrything must be tuned acordingly. but if you put a 7in exhoust on your car you will not change the fule mixture or run rich or lean. The combushtion and exhoust have left the engin at its maximum CFM and incresing its pathway will result in nuthing.

Jager

iTrader: (10)

SSAutochrome exhaust is just cheap. Buy the RB cat-back and you'll be fine OR get the XR-1 Muffler, get some mufflers off eBay, then go to the local shop and have them make you an exhaust to your specifications. I'm sure it won't cost more then $500 when its all said and done.

iceblue

Actualy I think the SSAC is quit decent. I mean it is well fabed and is the same exhoust as corksport. Providing you like fart cannon style and all.

RotaryEvolution

iTrader: (30)

it is decent but too loud which is why i plan on putting an XR-1 where the cat replacement pipe sits, this will quiet it down a bit. $450 still beats $800 on my calculator.

NSXchink

are you telling me ur switching the resonator thing from ssautochrome, with the xr-1 muffler, and still use the ssautochrome fart cannon?
thanks

NSXchink

ok so going from 3" to 2.5" doesn't really make a difference..
and depends on how car is tuned, considers how rich you will run..
ok so if you place a pipe near its required size you will run rich, and if you go way bigger, you won't run rich or lean?

iceblue

Your getting the grasp. Going from 2.5 to 3 will not efect the car if your maximum CFM flows at 2.5 or vise versa. The car will not run lean nor rich. This is because you are outside the cars performance rating. Considering the car is tuned at maximum CFM runing maximum CFM piping. With this demonstration if you went smaller you would notice a differance. With car tuned at maximum capability we are using 2.5 for exsample and you go down you will run rich. But we would be incapable of making car run lean b/c we are tuned at our maximum capability. As I stated befor if our maximum CFM rating is met with 2.5 straight and you add things like bends and mufflers this decressing the amount of CFM we can now flow thus requiering changes such as larger pipe at the begining of the exhoust. Remember our blow pipe test we can not flow more then we can push out the end but we can increase capacity at the larger end thus adding a 3in down pipe for instance will increase our flow rate if required. The only way to know this is through RND and thus $$$$$$$ and when you buy an exhoust that has ben through this you pay alot more $$$$

No. If you use a pipe at its required or tuned size you will run perfect! If that pipe is outside of our range thus 2 big you wont run rich nor lean. Your car is allready at its maximum capacity and puting something over that just does nuthing. You will lose back presure this way and lose HP you have to have back presure but you wont efect the fule. To test back presure get a straw now blow as hard as you can! Now get a garden hose and blow as hard as you can. This will give you the illushion of back presure utalizing your breth as maximum CFM's capable. Now if you used a pipe with one larger end cap the small end with your hand and leave some opening to create back presure you can blow easaly untill you fill up the pipe and then you have back presure. This will simulate if you had mufflers you can only flow as much as the smallest point in the pipe but you can flow more air into the pipe this simulating why if you add mufflers that you may need to go larger then if you had a straight pipe to flow the same rate.

For instance why a 2in free flow exhoust can flow the same CFM's as a 3in with mufflers