electric cutouts on the s4.

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04-19-2006, 09:43 AM

#21

'Nova more S4

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agreed, my question was more about if there's a sudden pressure drop what that would do

I could see switching positions with the car at idle, but if he were to open them up at a certain RPM I'm not sure if that sudden change would have any negative impacts.

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04-19-2006, 09:48 AM

#22

Snow Trooper= Sa'tin

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only positive effects

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04-19-2006, 09:50 AM

#23

M3=Lunnch

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how did you make the piece that goes from the end of the DP to the cutout? Custom?

2.25" piece coming off straight downward?

What side cutouts? 2" or 2.5?

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04-19-2006, 09:52 AM

#24

bertworks(dan@jhm)

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i was just thinking of how some high end sports cars like the new z06 or the ferrari f-430 have

electric cutouts that open up at a certain rpm to increase horsepower for the top end but are closed at low rpms for torque. but then i forgot how they dont have pimp *** turbos like we do

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04-19-2006, 10:03 AM

#25

bertworks(dan@jhm)

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i just have gutted stock downpipes going into the 2.5" cutout pipe, then to my stock cats.

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04-19-2006, 10:12 AM

#26

M3=Lunnch

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so, 2.0" cutouts, 2.25" or 2.5"?

TIA!

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04-19-2006, 10:13 AM

#27

bertworks(dan@jhm)

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im not too worried about that since i dont keep them open for very long periods of time.

i think maybe the only concern would be at a road course or auto-x event when they would be open for long periods of time, but even then im not too worried since my car will be moving the whole time.

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04-19-2006, 10:19 AM

#28

Mark P

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very nice - glad to see someone add the electric control

<img src="http://ctny.audiworld.com/mark/s4/downpipes/dumps/dsc06148.jpg">

<img src="http://ctny.audiworld.com/mark/s4/downpipes/dumps/dsc06155.jpg">

Here's my car with back to back runs with open and closed dumps (on racegas program):

<img src="http://ctny.audiworld.com/mark/s4/dyno/104bpa_closed_dumps_open_dumps.png">

<a href="http://ctny.audiworld.com/mark/s4/dyno/" target="_blank">http://ctny.audiworld.com/mark/s4/dyno/</a>

<a href="http://ctny.audiworld.com/mark/s4/downpipes/dumps/" target="_blank">http://ctny.audiworld.com/mark/s4/downpipes/dumps/</a>