SACLAM Limited Production Exhaust System

M.Bonanni · 04-25-2009, 10:40 AM

Interesting. I thought they were cutouts that you could un-cap and bypass the second mufflers. Backpressure tubes makes some sense though.

RCZ · 04-25-2009, 09:07 PM

wow. What the hell is that. Stick to the basics haha.

Looks interesting...

initialgemini · 04-26-2009, 02:23 AM

Quote:

Originally Posted by semtex

They're backpressure tubes. They provide backpressure at low rpms, which aids with low-end torque.

back pressure tubes? I would imagine those are more to achieve the right "exhaust note" rather then effect the overall velocity of the exhaust gases.
Correct me if im wrong here, but wouldn't narrowing the piping to increase exhaust velocity be more effective than adding "backpressure" tubes.

semtex · 04-26-2009, 08:00 AM

Quote:

Originally Posted by initialgemini

back pressure tubes? I would imagine those are more to achieve the right "exhaust note" rather then effect the overall velocity of the exhaust gases.
Correct me if im wrong here, but wouldn't narrowing the piping to increase exhaust velocity be more effective than adding "backpressure" tubes.

No. The whole point of backpressure tubes is that, past a certain exhaust velocity, they're bypassed. In other words, they're variable -- they give you backpressure at low rpm (which is where you want it), but don't restrict flow at higher rpms. If you just narrow the piping, you lose that variability. These tubes are really no different than what HKS did on their exhaust for the 350, so I'm not sure why everyone is so puzzled by these secondary tubes. (Well, maybe people haven't ever seen the HKS 350 exhaust or something.)

snotrocket · 04-26-2009, 11:25 AM

sounds mean. i would like to hear it at wot.

SoCal 370Z · 04-26-2009, 12:46 PM

Quote:

Originally Posted by semtex

No. The whole point of backpressure tubes is that, past a certain exhaust velocity, they're bypassed. In other words, they're variable -- they give you backpressure at low rpm (which is where you want it), but don't restrict flow at higher rpms. If you just narrow the piping, you lose that variability. These tubes are really no different than what HKS did on their exhaust for the 350, so I'm not sure why everyone is so puzzled by these secondary tubes. (Well, maybe people haven't ever seen the HKS 350 exhaust or something.)

Semtex,

Thanks for the pic post as I wonder whether the 5Zigen does not have a similar setup when viewed underneath with the extra cans atop the actual mufflers? Can you please fly your private jet to Japan and find the answer for me? Inquisitive minds want to know. (Now watch AK smoke me on finding this out first.)

RCZ · 04-26-2009, 01:14 PM

Active autowerke uses the HKS style for all of their high end exhausts too.

alan93rsa · 04-26-2009, 02:57 PM

A side note on HKS. I believe in the most recent Grassroots Motorsports Magazine they tested several exhausts for the 335i and the HKS exhaust was their pick.

sensi09 · 04-26-2009, 03:48 PM

I believe those extra canisters on the HKS are for sound reduction and avoidance of drone.

"Backpressure tubes"? Forget what you've heard, but backpressure is a bad thing and kills power. Initialgemini had it right, as exhaust velocity is key. The key is to match pipe diameter to give the greatest exhaust velocity with the least amount of backpressure and of course matching to your power band. A narrow pipe will have greater velocity at low RPMs while a wider pipe will flow better at high RPMs so a well-designed exhaust will take this into account and should have a correct balance.

semtex · 04-26-2009, 05:28 PM

There's no need for separate piping if all you're looking to do is reduce sound -- that's what in-line resonators are for. Now, I want to be clear here. I am not vouching for the effectiveness of using separate piping for backpressure, I'm just explaining what the intent behind the design is. Personally, I think they're gimmicky. But believe what you want to believe. It doesn't make an ounce of difference to me.

initialgemini · 04-26-2009, 06:30 PM

Quote:

Originally Posted by semtex

No. The whole point of backpressure tubes is that, past a certain exhaust velocity, they're bypassed. In other words, they're variable -- they give you backpressure at low rpm (which is where you want it), but don't restrict flow at higher rpms. If you just narrow the piping, you lose that variability. These tubes are really no different than what HKS did on their exhaust for the 350, so I'm not sure why everyone is so puzzled by these secondary tubes. (Well, maybe people haven't ever seen the HKS 350 exhaust or something.)

My understanding of fluid dynamics is fairly basic, thanks for explaining.

sensi09 · 04-26-2009, 10:16 PM

Quote:

Originally Posted by semtex

There's no need for separate piping if all you're looking to do is reduce sound -- that's what in-line resonators are for.

From the marketing of the HKS hi-power exhaust, these extra canisters are for sound reduction and tuning. In this regard, they are similar to resonators. Search for "dead chambers" for more info on this.

semtex · 04-27-2009, 07:26 AM

Quote:

Originally Posted by sensi09

From the marketing of the HKS hi-power exhaust, these extra canisters are for sound reduction and tuning. In this regard, they are similar to resonators. Search for "dead chambers" for more info on this.

Hmm...well that makes the design even worse, IMO. Extra piping = extra weight. If the right sound can't be achieved with the normal in-line resonators and mufflers, that's just not good. Just my 2 cents.

LiquidZ · 04-27-2009, 12:21 PM

With regards to the SACLAM unit, it looks to me as though the HUGE resonators up front are what cures the drone, and the extra piping out back prevents the loss of backpressure.

Now, the HKS unit shown above looks like it serves both purposes by incorporating a "dead-end" with a resonator attached to it.

Also, backpressure isn't bad if its used correctly. For N/A applications, you need backpressure to prevent the loss of torque in free flowing exhausts. If you have too much though, then you will lose power. Think of it as a glass of red wine a day. In moderation, its actually good for you, but in excess its not. Horsepower and torque are both important IMO, and not just horsepower.

Nikon FM · 04-27-2009, 12:36 PM

Hard data is what really would convince one way or the other...............where's the comparitive dyno chart, that and the weight numbers?

04-25-2009, 10:40 AM	#16 (permalink)
M.Bonanni The370Z.com Sponsor Join Date: Nov 2008 Location: Las Vegas Posts: 2,575 Drives: Fast Rep Power: 1320	Interesting. I thought they were cutouts that you could un-cap and bypass the second mufflers. Backpressure tubes makes some sense though. __________________ MikeBonanni.com Twitter: http://www.twitter.com/MikeBonanni Facebook: http://www.facebook.com/MBonanni36 Function > Form

04-26-2009, 02:57 PM	#23 (permalink)
alan93rsa Enthusiast Member Join Date: Feb 2009 Location: Ohio Posts: 412 Drives: 16 Cayman GT4 Red Rep Power: 220	A side note on HKS. I believe in the most recent Grassroots Motorsports Magazine they tested several exhausts for the 335i and the HKS exhaust was their pick. __________________ 16 Cayman GT4, Carmine Red, Buckets, PCCB etc.

04-26-2009, 03:48 PM	#24 (permalink)
sensi09 Enthusiast Member Join Date: Dec 2008 Location: so cal Posts: 449 Drives: _ Rep Power: 16	I believe those extra canisters on the HKS are for sound reduction and avoidance of drone. "Backpressure tubes"? Forget what you've heard, but backpressure is a bad thing and kills power. Initialgemini had it right, as exhaust velocity is key. The key is to match pipe diameter to give the greatest exhaust velocity with the least amount of backpressure and of course matching to your power band. A narrow pipe will have greater velocity at low RPMs while a wider pipe will flow better at high RPMs so a well-designed exhaust will take this into account and should have a correct balance. Last edited by sensi09; 04-26-2009 at 03:51 PM.

04-26-2009, 05:28 PM	#25 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 53 Posts: 5,995 Drives: People to drink Rep Power: 32	There's no need for separate piping if all you're looking to do is reduce sound -- that's what in-line resonators are for. Now, I want to be clear here. I am not vouching for the effectiveness of using separate piping for backpressure, I'm just explaining what the intent behind the design is. Personally, I think they're gimmicky. But believe what you want to believe. It doesn't make an ounce of difference to me. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

04-27-2009, 12:21 PM	#29 (permalink)
LiquidZ A True Z Fanatic Join Date: Nov 2008 Location: Columbus, OH Posts: 1,940 Drives: Mag. Black 2009 370Z Rep Power: 704	With regards to the SACLAM unit, it looks to me as though the HUGE resonators up front are what cures the drone, and the extra piping out back prevents the loss of backpressure. Now, the HKS unit shown above looks like it serves both purposes by incorporating a "dead-end" with a resonator attached to it. Also, backpressure isn't bad if its used correctly. For N/A applications, you need backpressure to prevent the loss of torque in free flowing exhausts. If you have too much though, then you will lose power. Think of it as a glass of red wine a day. In moderation, its actually good for you, but in excess its not. Horsepower and torque are both important IMO, and not just horsepower. __________________

04-25-2009, 09:07 PM	#17 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	wow. What the hell is that. Stick to the basics haha. Looks interesting...

04-26-2009, 11:25 AM	#20 (permalink)
snotrocket Base Member Join Date: Apr 2009 Location: louisiana Posts: 99 Drives: 09 370z Rep Power: 16	sounds mean. i would like to hear it at wot.

04-26-2009, 01:14 PM	#22 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	Active autowerke uses the HKS style for all of their high end exhausts too.

04-27-2009, 12:36 PM	#30 (permalink)
Nikon FM Track Member Join Date: Jan 2009 Location: Snoqualmie WA Posts: 973 Drives: 03 996TT Porsche Rep Power: 606	Hard data is what really would convince one way or the other...............where's the comparitive dyno chart, that and the weight numbers? __________________ Buddy Revell: "One man's sooner is another man's later"

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