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View Full Version : Any DIY powered exhaust cut out



charchri4
02-09-2014, 01:55 AM
There is a fine line between moron and genius and I'm pretty sure which side this falls on...

The saga starts when I noticed a a 3 1/2" elbow that happened to be sitting on the counter at NAPA.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/Cut1_zps5d42c777.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/Cut1_zps5d42c777.jpg.html)

That sparks an idea. This would be so much better than my 2 1/2 manual cut out that doesn't flow very well.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/85139_zpse863b9cc.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/85139_zpse863b9cc.jpg.html)

So I hunt on ebay for at least a 3" throttle body.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/Cut3_zps6d68c1da.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/Cut3_zps6d68c1da.jpg.html)
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/Cut2_zps696fcc13.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/Cut2_zps696fcc13.jpg.html)

Then out comes the welder to put them together.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut4_zps67dc128c.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut4_zps67dc128c.jpg.html)
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut5_zpsd0635448.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut5_zpsd0635448.jpg.html)

With a header flange I attach this monster to the side of the muffler. I also put a scoop at the back to direct air down the cut out.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut6_zps7a71e356.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut6_zps7a71e356.jpg.html)
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut7_zps6b06a061.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut7_zps6b06a061.jpg.html)

I try to hide it so it won't show.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut8_zps81d7e83c.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut8_zps81d7e83c.jpg.html)

Now how to make it move I happen to have a control cable laying around so I route it up to the drivers seat.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut9_zps7f610d16.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut9_zps7f610d16.jpg.html)

PROBLEM! The cable control is really hard to pull and won't keep the throttle flap open with the spring in it. When I put less pressure on the spring it won't seal shut. Time for a plan B and where intelligent design kind of fall apart...

I cut apart a Camaro door to get the motor out.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut10_zpsde1c0441.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut10_zpsde1c0441.jpg.html)

Weld said motor in the trunk with a hunk of cable welded to the gear.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut11_zps719d5efb.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut11_zps719d5efb.jpg.html)
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut12_zps5dbb4897.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut12_zps5dbb4897.jpg.html)

Run the cable through the floor and a pulley to the throttle - er a no the cut out.
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut13_zpsdd6ae786.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut13_zpsdd6ae786.jpg.html)
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut14_zpsac7ad1d4.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut14_zpsac7ad1d4.jpg.html)
Wire it all up the a Camaro power window switch
http://i1114.photobucket.com/albums/k534/charchri4/DIY%20Alignment/cut15_zpsfd9c59e2.jpg (http://s1114.photobucket.com/user/charchri4/media/DIY%20Alignment/cut15_zpsfd9c59e2.jpg.html)

And voila an electric cut out for 34 bucks. Click HERE to hear how it works. (http://youtu.be/Ddy_3YhSgtc?t=51s)

SM16RMSM
02-09-2014, 03:45 AM
Spare time and anything can be made from scratch. Liked the idea of using a throttle body for the cut.

Malibu Q
02-09-2014, 05:45 AM
Watched the movie :D
Well done, that's crazy fun!
It wasn't me officer...

tsingson
02-09-2014, 07:48 AM
That's pretty sweet. Wonder if you can feel any difference when under wide open throttle?

Agent☣Orange
02-09-2014, 08:54 AM
Haha, freakin love it!

Thought I recognized that sound...

I have something similar (in concept) on my ride. The two inner tips are pneumatically controlled. It's a factory upgrade to allow the exhaust to roar when you stomp on it but purr like a kitten otherwise. Of course, the aftermarket came up with a switching mechanism so that I can turn that LS rumble on and off at will.

http://i1194.photobucket.com/albums/aa375/YellowYata/ACsVette/New%20ownership%20Sept%202013/IMG_0687seml_zps2d1be65d.jpg

JLBMX5
02-09-2014, 01:12 PM
Could you wire up a switch to gas pedal to open up that exhaust at full throttle. I know they make the switch for nitrus setups .

alexey
02-09-2014, 01:36 PM
Well made man. What sleeves are you using on your suspension? Is tha ebay sleeves?

alexey
02-09-2014, 01:38 PM
You should make it look like a dual exhaust. Get the same tip as you have for the original exhaust, will be looking complete.

charchri4
02-09-2014, 02:37 PM
Well made man. What sleeves are you using on your suspension? Is tha ebay sleeves?

Nope it's spec Miata suspension right out of a race car. Bilsteins with Eibach 700 front and 350 rears.


You should make it look like a dual exhaust. Get the same tip as you have for the original exhaust, will be looking complete.

Thought about that for for some odd reason I kind of like the single exhaust. You know because the rest of the car is so subtle and stock... I probably will when I paint it though.

charchri4
02-09-2014, 02:47 PM
That's pretty sweet. Wonder if you can feel any difference when under wide open throttle?

LOL have you seen this clip?
http://youtu.be/e0vz9VdbxQc

That was with the old cut out open and about 40 less HP than it has now. The weak point is traction so I'd be surprised if I could feel a difference but it should sound a little better.