2nd Gen JCW Most liked posts in thread: R56 JCW - Build Thread - New Set Of Pipes

That would seem like a fairly quick/inexpensive win

 

I noticed a lack of low end power with the Stratmosphere I had, which I feel had very little back pressure. Had (and still have) the stock DP on. Once I put the stock S exhaust back on I liked it a lot better (off the line accleration). The factory JCW exhaust felt just like the stock S one as far as turbo-spooling pressure goes.

I dont exactly know the logistics of it, but the Strat system was 2.75" i think. JCW is closer to 2 1/8"

 

Interesting thought. I guess it just depends what sort of difference it makes. Only one way to find out though

 

Greate motive but i know that most butterflies in exhausts are built in to the mufflers not the initial pipe. I wonder how that would affect the performance, you could probably get a patent for it I cant wait to see what you come up with, i just wish i had the materials and machinery needed to make protoypes.

 

Touche!

I guess the real problem would be getting the buttfly valve at the right closure distance to mimic the flow rate of the factory exhaust. Tell me you have these tools:ihih: why cant you be closer to VA!

 

I think what Chuck said above is when its "closed" its still say, 80% open or whatever need be, but when open its 100% (minus the rod/disk assembly)

needs a free spin mode lol... so it can spin like a pinwheel and make some crazy exhaust notes :cornut:

 

I totally understand what he meant

Just wondering how the flow rate will be discovered.





HURRY UP WE NEED VIDS:incazzato:

 

Again, I am far from an expert so this is just a thought experiment, but wouldn't the butterfly valve interrupt the laminar flow of the exhaust enough to cause more impedance (back-pressure) than just the difference in measurable cross section of the exhaust?

 

Thats what im getting at, the valve closure would have to mimic the initial flow rate of the factory exhaust

 

:wink2: sweet! Would the flow rate be different at different engine speeds/levels of boost, or will it be a general reading?

I ask out of curiousity thinking about with more force comes more pressure and with more pressure comes more restriction. kinda like current and wires?

 

I get what your saying but you know more about this than i do and im just asking if it is relative to the electric side of the spectum with resistance/voltage/current if ya know what i mean

 

:lol:

 

Just tossing a thought out here. What if the butterfly disk were bent slightly in the middle creating a "V", with the point toward the flow. This might cause the gas to be smoothly diverted past it, rather then hitting a wall.

Jim

 

Thats what I am asking. Just because the valve gives you a cross-section that is the same doesn't mean you will have equal "backpressure", does it?

Thinking about the "v-bend" I think when it was opened it would create a disruption because of the leading edge being "larger" than a flat plane. However, since we are waxing theoretical a valve with two half-circle blades and a centered hinge would do the same trick when blocking the flow. You still get a "smoother" airflow then when they open the flow they fold onto each other and out of the air flow as much as possible...

Neat to think about.

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