Legal sidepipes...... - Page 4

Towmaster · #61 (**permalink**) 04-12-2010, 05:27 AM

Any of you guys had a look at your cobra books lately?

Have a look at the cobra racecars and roadcars and let me know how many you can find with sidepipes like the majority of us all have?

Real Cobras don't necessarily have sidepipes at all. A lot have a single pipe running down the side exiting just in front of the rear wheels.

Just my 2c worth..

PS Yes i have fake sidepipes....

Beejay · #62 (**permalink**) 04-12-2010, 05:58 AM

I prefer sidepipes, but it is nice to see some variations.

I think most if not all replicas in Oz are modeled on the 427SC style, didn't most of these have sidepipes?

Ben

Aussie Mike · #63 (**permalink**) 04-12-2010, 07:02 AM

Quote:

Originally Posted by Towmaster

Any of you guys had a look at your cobra books lately?

Have a look at the cobra racecars and roadcars and let me know how many you can find with sidepipes like the majority of us all have?

Real Cobras don't necessarily have sidepipes at all. A lot have a single pipe running down the side exiting just in front of the rear wheels.

Just my 2c worth..

PS Yes i have fake sidepipes....

The single pipe down the sides that exits under the front guard rather than through the guard is the 289 FIA car. Street cars didn't normally have side pipes but the comp cars certainly did. Back in the day a lot of street 427 Cobra owners fitted the roll bar, hood scoop and side pipes to replicate the look of the 427 S/C cars.

The majority of us are using a replica of the 427 body, there aren't many 289 replicas in Australia (The body is quite different. No oil cooler scoop, different grill opening shape, different flares etc). So if we are mostly using the 427 body then why not make it look like the S/C if you want to.

Cheers

CobraEd · #64 (**permalink**) 04-12-2010, 07:22 AM

The Dodge Viper is a 600HP normally aspirated car. It is not loud at all. Wonder how they do it????

Maybe active noise cancelation via audio electronics would work!!! ???

.

Rob. Smith · #65 (**permalink**) 04-12-2010, 10:27 AM

Pipes ! It's all in the pipes ! The total length of an exhaust system controls the sound level output not just the mufflers. Unfortunately the side pipe isn't long enough to completely dissapate the sound. (without flow restriction)

Rare Iron · #66 (**permalink**) 04-12-2010, 10:14 PM

Quote:

Originally Posted by CobraEd

The Dodge Viper is a 600HP normally aspirated car. It is not loud at all. Wonder how they do it????

Maybe active noise cancelation via audio electronics would work!!! ???

.

Cause it's a V-10. Not nearly as noisy as a V-8. I've built & shipped numerous sets of Cobrapack Mufflers to AU. & NZ. & no complaints at all from the guys down under. Superior flow & excellent noise control. The stainless pot scrubber idea is excellent, except steel wool type materials are not good at absorbing much noise. I use a special fiberglass mat wich really absorbs sound very well & does not break down. I've never had complaints from these getting louder in 3+ years of building the Cobrapacks.

Aussie Mike · #67 (**permalink**) 04-12-2010, 11:08 PM

I use the stainless pot scrubbers as a transition to the fiberglass packing. The stainless wool dissipates a lot of the heat before it gets to the fiberglass and stops it burning out so quickly.

Cheers

Rare Iron · #68 (**permalink**) 06-13-2010, 07:19 PM

Quote:

Originally Posted by Mando

Ouch, but I always admire people that speak their mind!

Regards.

The Aussies speak their minds allright - even worse than the Canadians. The only gun toting Americans to worry about are the criminals - same as the criminal gun toting Aussies.

Excaliber · #69 (**permalink**) 06-13-2010, 07:53 PM

Rob Smith, sorry I missed the question for so long on this thread! How far away are the DB sound readings taken?

From what I've been able to gather it's like a meter is set up at a particular location on the track somewhere. Like at "turn three" or where ever. 20 -30 ft for sure, I've heard it's more like 50 feet. If you know where it is you could possibly "sand bag" in that area if you know you will be kicked off the track if you don't.

Oregon actually specifies a reading from 50 feet for the State DB levels. But the State rarely enforces a sound limit anyway. You would have to be obnoxious, really loud and rude before it would become an issue on the "street" here. But it IS an issue at various American race tracks!

mic n gill · #70 (**permalink**) 06-14-2010, 01:02 AM

I Feel sorry for some of you guys, They allow live pipes over here, they do have limits for boy racers tho (I think I an the oldest boy racer in NZ) but you still have to drive like a nana past the po-lice man here, you have to look out for "the mister nasty"---Mic

Merv and Sharon · #71 (**permalink**) 06-14-2010, 03:07 AM

Just shows Mic that NZ is not as progressive as we are. We have 99 ways to stops you doing something rather than ways to allow it safely. Hope you remain as fortunate as you are.

Rob. Smith · #72 (**permalink**) 06-16-2010, 04:44 AM

Quote:

Originally Posted by Excaliber

Rob Smith, sorry I missed the question for so long on this thread! How far away are the DB sound readings taken?

From what I've been able to gather it's like a meter is set up at a particular location on the track somewhere. Like at "turn three" or where ever. 20 -30 ft for sure, I've heard it's more like 50 feet. If you know where it is you could possibly "sand bag" in that area if you know you will be kicked off the track if you don't.

Oregon actually specifies a reading from 50 feet for the State DB levels. But the State rarely enforces a sound limit anyway. You would have to be obnoxious, really loud and rude before it would become an issue on the "street" here. But it IS an issue at various American race tracks!

For street vehicles the meter is placed at 45 degrees from the exhaust exit at 525mm (20 3/4 ") and the engine is revved hard once. It must be lower than 89 db. The rolling measurement is from 7.5 metres (25 ft) doing 30mph in 2nd gear. that measurement must be 77db or lower. Damn Tuff...the car must sound like a factory jobby.

Twig · #73 (**permalink**) 06-26-2010, 04:59 AM

What are the rules in Victoria??

boxhead · #74 (**permalink**) 06-26-2010, 07:33 AM

I think they are a no for Victoria.

There may be some way, but very diffcult?

sambo · #75 (**permalink**) 06-26-2010, 04:35 PM

My understanding in Vic is that you cannot have exhaust pipes exiting to the footpath. Driver's side is technically OK though.

T.L. · #76 (**permalink**) 06-26-2010, 08:43 PM

Quote:

Originally Posted by sambo

My understanding in Vic is that you cannot have exhaust pipes exiting to the footpath. Driver's side is technically OK though.

Since when do we park near footpaths, aren't they just driven, then cleaned and put back in the garages only to be driven and cleaned again!!!!!!. A heat shield of some sort should allow those burnt legs to be safer.

I see them as a crime prevention thing, get too close and your going to get burnt. I like the crime prevention things they have in South Africa
http://www.youtube.com/watch?v=fDrzMGdYWZc.

WACR · #77 (**permalink**) 10-23-2010, 05:54 PM

Aussie Mike,

Great set of side pipes you built, I have a question relating to emissions,
I did not notice in your side pipe pictures the O2 sensors locations.Where are you locating them or are they just not in view?

Lexluther · #78 (**permalink**) 04-06-2013, 11:57 PM

Slow day on the forum, thought I would drag this old thread out.

While I am patiently waiting for my cobra to arrive I am reading everything I can on this forum - today it was about live side pipes.
I found some really clever ideas, some really nice engineering and some funny stuff in there as well.
Halfway through - it even got into gun control discussion.

From what I have been told, rules and regulations have changed since this thread was started.
My question is, has anyone in any state, actually legally registered their Cobra with live side pipes in recent times that tick all the boxes, noise, emission, performance, heat shielding and last but not least - looks. Without resorting to tricks and temporary measures, just to get through the test day.
Just curious if it is possible to get the pipes legal, or is it in the too hard basket?
Sorry if this has already been coverd in another thread.

Cheers

Jaydee · #79 (**permalink**) 04-07-2013, 04:08 AM

Hi.
I'm pretty sure you can have 2 side pipes in SA. I am running a cat inside the guards then exiting to a 1.2 meter hotdog. I hope that will be quiet enough.
And also covering the hotdog with a stainless heatshield. The whole system will be covered with heat cloth.
JD

jpetran · #80 (**permalink**) 04-08-2013, 11:07 AM

I am amazed on how many questions come up all the time on the NOISE issue. And for everyone of those questions, you have many, many responses from folks who kind of tinkered on how to reduce the db's. I read all these posts and did a long investigation on it and finally saw the video on the flowmaster pipes that were built for Jay Leno's cobra. I still have the extra set and last ones ever to be made by flowmaster. Go to the for sale section and find them. Last time I looked it was past page 7. In the ad is the video to watch on Leno's car with the sound the flowmasters make.