So I want a 3 Inch Downpipe... where do i go?
#5
Elite Member
iTrader: (9)
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,922
Total Cats: 402
Are you using the GReddy manifold? The largest so far for that is supposed to be the BEGI downpipe. It's real tight back there against the firewall. If you have a custom manifold then you may have to go to a fab shop to do it. I had a 3"DP on my old setup (custom manifold too) as do other people, it's definitely possible to fit one in there.
#6
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
I'd wait to see what BEGi comes up with. Even with a 2.5" to 2.75" the divorsed wastegate setup should prove to be better than a sraight 2.5" to the cat. Maybe you can work with Corky to make the bottom half step up to 3".
#11
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,338
Total Cats: 573
I have no real numbers on this but Jay Kavanaugh (miata.net / R&D @ Garrett) says a downpipe matching the exducer then with a divergent angle (I think 11 or was it 17°?) exiting the turbo is the ideal situaion. if you can somehow fit that in your engine bay, i think you'll get most of the benefit of the large exhaust....
#12
Like this?
http://russmarshall.com/v/cars/cmc7/...10856.JPG.html
I had to modify the engine bay slightly ...
The cone is from Burns Stainless and it extends into the housing to block the wastegate.
If one could find combined cone and bend this could be done in a Miata.
hrk
http://russmarshall.com/v/cars/cmc7/...10856.JPG.html
I had to modify the engine bay slightly ...
The cone is from Burns Stainless and it extends into the housing to block the wastegate.
If one could find combined cone and bend this could be done in a Miata.
hrk
#13
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
Total Cats: 6,793
Hahahahahaha!
I just noticed that on the main page of the forum the title of this post is truncated to "So I want a 3 Inch..."
With all the spam posts lately, only one thing immediately popped into my juvenile mind...
Sorry, for the thread-hijack.
I just noticed that on the main page of the forum the title of this post is truncated to "So I want a 3 Inch..."
With all the spam posts lately, only one thing immediately popped into my juvenile mind...
Sorry, for the thread-hijack.
#14
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,338
Total Cats: 573
Like this?
http://russmarshall.com/v/cars/cmc7/...10856.JPG.html
I had to modify the engine bay slightly ...
The cone is from Burns Stainless and it extends into the housing to block the wastegate.
If one could find combined cone and bend this could be done in a Miata.
hrk
http://russmarshall.com/v/cars/cmc7/...10856.JPG.html
I had to modify the engine bay slightly ...
The cone is from Burns Stainless and it extends into the housing to block the wastegate.
If one could find combined cone and bend this could be done in a Miata.
hrk
reality unfortunately dictates you can either bend first and then flare OR use a stubby flare and then bend. I'm torn but I think I'll be turning first and then flaring.
#15
Like this?
http://russmarshall.com/v/cars/cmc7/...10856.JPG.html
I had to modify the engine bay slightly ...
hrk
http://russmarshall.com/v/cars/cmc7/...10856.JPG.html
I had to modify the engine bay slightly ...
hrk
#16
Senior Member
iTrader: (6)
Join Date: Mar 2005
Location: Sammamish, Washington
Posts: 1,396
Total Cats: 0
Contact Rob at www.Flipsidecustoms.com. He fit one on his old Greddy setup. You won't lose any low end. Just nice spool and power gains.
#17
YOU DON'T NEED TO HAVE A FULLY SIK 3" DUMP PIPE. You have your hand on your sausage. 3" is overkill on a 2L engine, what do you have?
Much more important is the velocity of the exhaust gases. The faster the gas, the better the exhaust system and bigger DOES NOT = faster flow. You will have LESS power with a 3" all the way through than with a matched custom system of about 2.5"(depending on your power level and capacity of course)
Do some reading, then get a 2.5" dump pipe.
60AGS
Much more important is the velocity of the exhaust gases. The faster the gas, the better the exhaust system and bigger DOES NOT = faster flow. You will have LESS power with a 3" all the way through than with a matched custom system of about 2.5"(depending on your power level and capacity of course)
Do some reading, then get a 2.5" dump pipe.
60AGS