Twin turbo c5

Ron , I thought about runnig mine out the front like my fairmont but I'm trying to make this thing as quiet as possiable inside the car . The fairmont isn't that loud inside I drive it everywhere but id like to see how it sounds all the way out back on my nova. I wish you lived closer Ron I'd hook you up defintly us turbo guys gotta help each other out you know. Haha!

RonSSNova

iTrader: (3)

Oregon is far away from everything, except Washington.
I might end up under the car too. Was just hoping to eliminate the weight and cost of doing that right now.
I had dual 3.5" on with the big block, with 4 mufflers and tail pipes. Over 100 lbs, and it was still loud!

Twin turbo c5

Yeah I never could quiet down my bbc either. Your probably doing the right thing by not running out tha back I'm probably gonna end up just dumping it. But I thought I'd give it a try with some free stainless. Lol! One thing I like about just dumping by the front tire is that there no drone at cruise speeds.

Twin turbo c5

Gettin my dp pieced together . It's made outta stainless water pipe from a plant in my hometown . That's why there's so many vband flanges. They actually come in handy already made on the pipe saves some welding I would have to do. Some vbands I just welded up solid .

LSXMATT

iTrader: (1)

Looking good!!

yenkomike

iTrader: (2)

i built a 3.5 dp and made a 3" y pipe and hooked up my dual 3" exaust with tailpipes and it sounds good . if i close the hood you whould never know it has a turbo at idle. has not been down the road yet but im sure it will be quiet.

Twin turbo c5

I was planing on making a y then go into two mufflers but I think I'm gonna go 4 inch all the way to the back and put a few straight through mufflers in sequence. And see how that works .

Chevy406

iTrader: (12)

I have dual 3" pipes run out to the fuel tank with 3-chamber Flowmasters. The turbo engine is noticeably quieter than the old SBC. My Magnafuel pump is louder than the exhaust at idle and cruise. I really like having the full exhaust but I am thinking about replacing the 3-chamber mufflers with a straight through design for less back pressure. Another idea is to try adding mufflers to the wastegates since I currently just dump them to atmosphere. If they were quieter you probably could barely hear my car going down the track.

LS1NOVA

iTrader: (12)

Looks nice!

RonSSNova

iTrader: (3)

Here comes the Nova guys.....

Twin turbo c5

I'm sure that thing is quiet . I'm just trying to find a happy medium. My corvette was twin turbo with full exhaust out the back with borla's and it sounded awesome . I'm trying to eliminate alot of drone at cruise speeds too. This will be driven alot so trying to make it a comfortable as possiable .

Twin turbo c5

Also chevy406 your car sounds awesome !!. That thing is laying down some good et's even with the 3 chambers.

ryanleiker

iTrader: (2)

Nova builder checking in...

https://ls1tech.com/forums/conversio...urbo-nova.html

Forcefed86

iTrader: (4)

Hard to get things quiet with such large piping and mufflers. IMO the trick is smaller piping and a restrictive OEM style mufflers. Run your 3-4" downpipe with a dump. Then make a T merge off that with some dinky crush bent 2" exhaust back to OEM style mufflers and it will be quiet as a kitten.

This is Zbrowns setup. Something similar with a 3" DP to a dump and 2" piping to the rear of the car would be perfect.



I ran a 3" dp to a 4" electric dump. Then through factory 2" dual exhaust with 2 OEM silencers and 2 mufflers on my lexus. It looked and sounded OEM.

http://s17.photobucket.com/user/Hybr..._2860.mp4.html

Twin turbo c5

Thanks for that pic that gave me some good ideas. I think I'm gonna continue with my 4 inch till I get to about the back tire and dump it with a electric cutout then continue with maybe 3inch to a single muffler or maybe two out the rear should be super quiet cruising through town.

stevieturbo

This is an old image I found years ago, I think it's from Vizard about muffler designs. Not sure how accurate it is. And of course there will be various chambered designs too



As far as noise goes though, I found the straight through style actually quietened my car more than a Magnaflow chambered muffler ( I tried a pair at the rear, of exact same outer dimensions to see which were quietest. Just stuck with straight through as they were quietest. )

Twin turbo c5

I think honestly I'm gonna do a electric cutout. I've never wanted to use one but I think I can have the best of both worlds . I've had 4 different turbo cars over the last 10 years or so and I've had every different exhaust combo you could imagine . And it'll make it easier on me running 3 inch pipe to the back instead of 4 . But I'm gonna keep the down pipe I just made incase later I wanta go back to running 4 inch out the back.

Twin turbo c5

Back to square one at the welding table.

RonSSNova

iTrader: (3)

That's was Vizards article. Back when he was discussing "no loss" exhaust

Twin, we think alike. Miller welder and an old area rug on the grudge floor. Although I have cats, no dogs.

Twin turbo c5

Oh yeah I love miller welders. Yeah those garage floors get cold makes it nice to lay on a nice soft rug under the car doesn't it?