Chris Ng

I'm curious.. I'm currently running a td07 25G turbo @ about 16psi.. the motor is a 13bt with a small streetport... my exhaust setup is a custom 3" downpipe mated to a racing beat presilencer (3in inlet/outlet) and Ypipe to 2 mufflers.. my concern is that at the y pipe, exhaust diameter drops from 3" to about 2.125" pipe to each muffler... while the racing beat system is supposed to be a good flowing system, could the piping after the y pipe be posing as a exhaust restriction? would I see any gains by creating a new system from the Y pipe back that is a true 3" system?? While on the topic, is it possible for the presilencer to be another point of restriction? Do these things eventually clog up needing to be replaced? what if I were to eliminate the RB presilencer and the rest of the exhaust system and use 3" pipeing for the rest of the system?

what are the advantages and the disadvantages of doing this?

Thanks,
Chris

rx7raca

Yes, the presilencer is restricting the flow, and the y pipe I dont think is hurting you that much because its going to 2 pipes. It's not just like one pipe at 2.125. So if you think about it, it would be 2.125x2.

If you were able to get more flow through the exhaust, you will be getting better spool time.

Where is your wastegate being dumped? If it's into the exhaust, having 3" is a better idea.

Maxthe7man

hahahaha........
THat baffling in that presilencer could conceivably collapse after awhile, I don't think it would clog though..One would think it would burn right out though. On the GX, the pre-silencer does nothing as far as noise is concerned.

The RB rear section y pipe is superior to the crush bent Y thats in the black car, although I straighted out the crush bent bends with mandrel bends, the y pipe part still sucks kinda compared to yours, and it handled the Partial bridge and the to4e.
Find some 2mm rotors and rebuild this winter....

Max

Edit* Ps: you still have those 8.5's sitting here

RETed

People are smoking crack, and have very little experience with the Racing Beat products.
I've seen this particular system (Racing Beat full 3" back, right?) handle 500hp at the wheels.
I've NEVER seen the 3" presilencer fail.
I run one myself, and the bitch is built with very heavy gauge steel.
I seriously doubt it will fail...unless you do crazy **** like run ungodly high EGT's.


-Ted

Maxthe7man

The outer shell has nothing to with how its built inside.. The outer shell on the one on my n/a is intact, and yes is built with very heavy steel, however the guts are gone out of it, and its not doing much anymore. It all depends on how the guts broke down size wise, and what happened to the chunks, if they pile up out the outlet, it will hurt flow, if they just blow out, it becomes a heavy duty empty can....
However in Chris's case, I think his problem is his motor more than anything..Max

FD3SR1

how well does the racing beat dual tip flow compared to a big fart can? the reason i ask is i like the way the dual tpi racingbeat looks and sounds but im going single like t78 or hks to4r and want it to still flow good!

RacerXtreme7

iTrader: (2)

Racing Beat turbo back exhaust.......

Is the pre-silencer causing a restriction? NO, its a straight through silencer as are the mufflers.

the RB turbo back system is actually bigger then a 3" system. Its 80 mm (3.15") with the "Y" pipe diameters of 60mm (2.375") NOT 2.125". Is the Y pipe a restriction?? NO, its combined area is bigger then the single 80mm down, mid and presilencer pipes.

All the new RB exhaust is made of stainless now, even the pipes (lower grade stainless is used for the piping and is painted black to resist rust) all the muffler cans are t304 polished stainless. The older systems were made up entirely of heavy wall mild steel piping and mufflers. I have yet personally seen any Racing Beat presilencer or muffler burn out of packing. This doent mean they wont or havent in someones car some were. they use high temp stainless whool for a heat barier then wrap that with a ceramic whool for sound deadening, heavy duty heat resistance stuff.

is the entire system a restriction? not really, its a great flowing system good for 500 whp, but getting a 3.5" or larger straight through system you would see gains in spool and power but the noise would be crazy loud. Great real world proof of this is BlueTII. His boost creep went away and spool slowed down when he "downgraded" from a 3.5" JIC straight through to the RB turbo back system.

~Mike............

Carl Byck

One option to improve spool, and one that I have used for years is a 3.5" DP(I have a 3.5" v band on my turbo) into the RB presilencer/y pipe. I have since switched to an N1 single mated to the same DP(to save weight). I have interchangable midpipes, one includes the RB presilencer, the other is straight 3" pipe. I have not run the straight one yet, but I would imagine it will make slightly more power than the presilencer version on the top end. I also made a 3" to 3.5" v-band adapter so that I can interchange turbos, since most turbos have a 3" v band standard. Even with the 3" v-band turbos the spool seems better than when I had a 3" DP. Carl
BTW, Chris, did you get things straightened out with Customs?

RETed

Are we talking about N/A parts?
No.
Chris Ng specifically was asking about the turbo 3" system.
I run this 3" pre-silencer, and I can profess it's pretty damn thick on the center perforated section.
It's at least 14-gauge if not thicker in there.
I have never heard of anyone killing this pre-silencer.


-Ted

BLUE TII

iTrader: (9)

Yes RB 3" turbo back is DEFINIELY a restriction.

As a matter of fact I used mine as a restriction to stop the the incessant boost creep I was having w/ my JIC 3 1/2" turbo back.

The restrictions I saw were-

The turbo to downpipe flage to pipe connection is a "cheated radius" as well as the 2 connections to the presilecer! There is a presilencer in the system. There is a "Y" in the system. The system is "only" 3". They do not remove the flashing (from pipe cutter- over 1/8" in places) from their pipes before they weld them into flanges and "Y".

It worsened my very low end- so I could not pull from under 1,500rpm cruise anymore- positive intake manifold pressure came on 300-500 rpm later (~1,000rpm w/ JIC, but ~1,500rpm w/ RB) and full 17psi boost came on ~1,000rpm later.

Though it was SOO quiet you can actually use your miderange around town w/ no problems- whereas w/ JIC even w/ buttplug I had to idle around and shift at 2,000rpm at lights to keep people from thinking I was racing.

And, old people compliment you on your exhaust w/ RB.

With the JIC system a nice officer pulled me over just to tell me if I was going to run an "illegal exhaust" I should be more careful of how I drive...

I love the RB, just not for its flow capabilities.

BLUE TII

iTrader: (9)

I run this 3" pre-silencer, and I can profess it's pretty damn thick on the center perforated section.

The only "failures" I have heard about are people filling it so much carbon it ceases to work as well and they have to clean it.

One option to improve spool, and one that I have used for years is a 3.5" DP(I have a 3.5" v band on my turbo) into the RB presilencer/y pipe

I laid my JIC Spec 90 3 1/2" downpipe over the RB downpipe and presilencer and they follow the exact same lines and the JIC is ~1" longer. Lucky coincidence!

So it would be easy to pick up the JIC Spec 90 downpipe and weld on a 3" RB flange and use the rest of the RB system.

That would sound SOOO good!!!


There is clearance on the JIC downpipe and FC chassis to fit 2 Borla 12" XR-1 in there (both round or front oval- rear round) if you demand a very quiet car.

I just thought of another RB restriction over JIC if using the stock turbo. The JIC inlet to downpipe is stock turbo internal diameter w/ "velocity stack" to downpipe. RB is full 3"at flange not counting their "crushing" to fit nuts.

For my "P" trim the RB was perfect though and I had to adapt JIC one.

FD3SR1

so out of all the exhaust systems out for the 7 which is your favorite? (everyone)

Maxthe7man

However Chris is the same as mine, so yes were are talking about the same parts, so now you can profess to the world you know someone that killed one of those presilencers..
Alot of people don't realize how hard an n/a car is on exhaust parts, the turbo takes alot of heat and energy out the exhaust stream, on a hard fast run on my n/a, I have seen the header, the pre-silencer and the piping in between glowing like a stove element...Max

Maxthe7man

I like the way the RB looks it fits the car very well.. On my GX its a dynomax/RB hybrid system, with a header its now louder than ****, but at first it wasn't bad before the pre-silencer lost its packing it was just chainsaw-ee on the top end, now its raspy all the time..
I rolled my own on my turbo out of magnaflow(3inch Downpipe to dual 2.5's), so far they are very good mufflers, not bad for noise at all with no pre-silencer. The only problem with them is an offsett inlet would have been nicer to work with for piping. Max

RETed

That doesn't make any sense...

Chris Ng said...
Does that mean you're running a 3" presilencer on your NA?
It sure sounds like Chris Ng is running a 13BT.


-Ted

Maxthe7man

Whats so hard? I bought a parts car that someone had grafted a RB presilencer into the exhaust system in order to replace the stock cats, when I built the header for the n/a I originally just had the dynomax cat back from the header, which proved to be somewhat unbearable, so I grafted the presilencer into the header/dynomax system, the presilencer made it bearable for about a year and some now its back to being rather loud since the guts are burnt out of it now, interestingly enough, the dynomax mufflers are still intact, but they don't get near as hot as the pre-silencer, althrough they have melted the rear bumper cover where they have touched it from time to time..max

RETed

I never said it was hard or impossible.
I said your experience is not applicable in this thread.


-Ted

BLUE TII

iTrader: (9)

so out of all the exhaust systems out for the 7 which is your favorite? (everyone)

Favorite FC exhaust for what application?

I would say the HKS 4" turbo back would be my favorite for race.

The RB 3" turbo back would be my favorite for street.

A custom unit or the old Knightsports dual 3" from turbo outlet stainless w/ 6 mufflers would be my favorite compromise exhaust.

Maxthe7man

No of course not, not having an RB presilencer burn up and the guts come out of it, this thread wasn't about RB exhausts or presilncers at all was it..

RETed

Reread the original post by Chris Ng...

I dunno where you get the notion we're NOT talking about a Racing Beat 3" pre-silencer or ANY Racing Beat products.
It looks pretty clear the thread was about Racing Beat exhaust components and the Racing Beat 3" pre-silencer.

Stop smoking the crack...


-Ted

Maxthe7man

Its called Sarcasm..

Make up your mind Ted...
As far as my "experience" in this thread, thats funny because:
First of all this car is local to me, I know it, alot of the parts on it passed through my hands.
Seond, I know the history of the car and its problems
Third you went on about the pre-silencer
Who cares what you havent seen, you haven't seen every presilencer on every other car either...They do fail and it is possible for this to happen..

The parts on both cars are the same pieces, you say its not possible, I tell you it is, now you want to ignore that and deem it unapplicable, simply because it runs contrary to what you posted... Its highly likely if an N/A can burn down the RB presilencer, a turbo car could do the same thing, I think the N/A would do it faster, but Chris's car's RB is older than my setup, and has seen more miles than the pre-silencer on my car. Yes they are tough cannisters, alot better than the alot of the other systems, but they do have their limitations and their lifetime, your car is alot closer to stock than either of ours, what our cars do to the exhaust components is problably different than what yours will do in terms of abuse.

Don't worry Ted, we get a kick out of your posts, even the last one Chris posted, where you came back and said its "bad grounding", that provided us with a good chuckle.... Chris is the king of the grounding straps, and is one of his favourite mods, he grounds everything..twice...And you say I assume to much....thats just funny...Max

Chris Ng

How about I give you both a cookie if you hug and make up??

rx7_turbo2

Ooooh did someone say cookie? I love cookies.

This thread wasnt all that hard to follow (although Ted would have us believe otherwise) Can the RB presilencer breakdown and clog? I'm sure it can, it's not indestructable, why is that so hard to believe Ted? I say remove the presilencer Chris. I think you will notice a difference, plus it should help draw the attention of Calgary cops off my car and onto yours

RacerXtreme7

iTrader: (2)

Those presilencers are a STRAIGHT THROUGH DESIGN.........

Lets just say that it is clogged......... there still would be no loss in performance (just a gain in noise).. its not a baffled system and the only thing that would be clogged is the tiny holes in the peforated core that could be clogged with carbon build up. Again, if those are clogged there is still NO restriction to flow, just to the sound absorption material. Those presilencers (and mufflers) are design basically to act like a straight piece of pipe and there wouldn't be any seat of the pants noticable difference if you ran a straight piece of tubbing in place of the silencer and mufflers or left them in there (clogged up or not or even burnt out).

~Mike................

rx7_turbo2

You missed what Max had described.

Yes I realize there is no baffeling. However it is possible for the perforated "screen" to break down, and fold back, break off, etc. In which case it is possible for the silencer to "clog" .