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How much power with 3" system 

 

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 Post subject: How much power with 3" system
Posted: Mon Feb 05, 2007 9:45 pm 
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What sort of rear wheel power would I be limited to if I used a 3" mandrel bent system? Is 200kw at the tyres achievable?
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Posted: Mon Feb 05, 2007 10:00 pm 
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high 300's at the treads is achieable, beyond that you should be looking for 3.5in

 

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Posted: Mon Feb 05, 2007 10:06 pm 
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What kind of cat are you running ebs? You have a 3 inch exhaust dont you?

Ive already got a 3 inch dump pipe but thinking about running a 3.5 inch dump to twin 2.5 inch exhaust like the XR6 T's if it can fit. I want to keep the noise down.
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Posted: Mon Feb 05, 2007 10:47 pm 
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I had single 3" and it maxed out at 370 rwkw...
On a 5.4 Windsor with two 61mm turbo's...

 

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Posted: Mon Feb 05, 2007 11:11 pm 
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here is a graph of approx exhaust power figures. this is out on the maximum boost turbo design book.

 

 

Attachments:
exhaust flow graph.JPG
exhaust flow graph.JPG [ 24.81 KiB | Viewed 70 times ]

 

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Posted: Mon Feb 05, 2007 11:16 pm 
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i want to upgrade my system to a 3.5in, currently i have full 3in, no cat. one straight through lukey race muffler, its just a perforated baffle pipe through glass pack. its not very loud at all.... what is loud is my screamer pipe. lol

thats also something for you to consider when picking a pipe size, if you plan to plumb the wastegate into the system, with a 3in, then at around the 600HP mark (flywheel) it will cost you about 50HP from the increased backpressure

i want to upgrade mine, although i havent tested the backpressure, i feel i have hit a point of diminishing returns, like it is being choked somewhere...

 

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Posted: Tue Feb 06, 2007 7:59 am 
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Thanks all my questions have been answered, 3" it is then. I got some prices and the 3.5" is way more expensive than 3".

Ive got straight gas so im going to remove the cat and run a 3" dump pipe, a single rear straight through offset muffler before the diff and then a mandrel bent 3" tailpipe. Ive got a 40mm wastegate that i will merge into the dumppipe.

Does anyone know who makes a 3" taipipe for wagons? (EF)
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Posted: Tue Feb 06, 2007 8:25 am 
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a guy up here has a t-trim vortech blown 308 stroked to 355 with a 3 inch and hes making 650+ rwhp no worries, f**k mean car btw :twisted:

would be different with a turbo tho, as the bigger the better.
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Posted: Tue Feb 06, 2007 8:43 pm 
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luke111 wrote:
Thanks all my questions have been answered, 3" it is then. I got some prices and the 3.5" is way more expensive than 3".

Ive got straight gas so im going to remove the cat and run a 3" dump pipe, a single rear straight through offset muffler before the diff and then a mandrel bent 3" tailpipe. Ive got a 40mm wastegate that i will merge into the dumppipe.

Does anyone know who makes a 3" taipipe for wagons? (EF)


Dump it at the diff.

 

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Posted: Wed Feb 07, 2007 7:31 am 
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I would except its the family wagon man!
Maybe Ill have to use a 2.5" tailpipe with a flange & adapter at the muffler before the diff.
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