View Full Version : like stock exhaust and power?!?!?!?!?!?!

02-06-2009, 11:27 PM
here is a project that is almost done. it is a vacuum actuated exhaust cutout.

materials- ford 5.0 throttle body, 2.5 exhuast piping, piece of metal for a flange, vacuum actuator from a cressida, vsv from any toyota, vacuum tank from 3sgte tvis system, and a variable rpm shift light.

im gonna put this in sometime soon, i hope it works as well as it does in the video.

http://i73.photobucket.com/albums/i220/donteatbugs/celica%20gt-s/th_101_1462.jpg (http://s73.photobucket.com/albums/i220/donteatbugs/celica%20gt-s/?action=view&current=101_1462.flv)

02-06-2009, 11:34 PM
Looks cool. Lots of racers out here would do that. The pre-assembled ones run about $300. Nice find Bugs. :)

02-06-2009, 11:44 PM
my cost so far= free

i was gonna buy the motorized ones on ebay but they are bulky and take 4-5 seconds to open. this one can be set at any rpm and be instant. now if it just works

02-07-2009, 12:00 AM
That is really sweet!!! Keep it up man, and keep us updated.

02-07-2009, 12:03 AM
Heh, I heard a boost-operated cutout on a 1.8T VW once, was loud as hell under power.

02-07-2009, 12:05 AM
sweet man hope it works as planned

02-07-2009, 12:18 AM
I just always ran a cable for it.

02-07-2009, 12:26 AM
Dont the newer cummins have something like this stock??

joe's gt
02-07-2009, 01:32 AM
Nice ingenuity. hope it works. I don't see any reason why it wouldn't. The throttle plate opens with the exhaust gas flow not against it, right?

02-07-2009, 01:40 AM
I've never seen one of these before.
This just opens up your exaust to be open pipes when the engine creats vacuum from reving?

This would work on a NA car as well no?

02-07-2009, 02:52 AM
sweet! good thing i got me one as well! will make a good cat pipe replacement.

02-07-2009, 04:42 AM
Dont the newer cummins have something like this stock??

I think you mean an exhaust brake?

02-07-2009, 04:53 AM
Very cool stuff. That should be much better than the electric cutouts. Check it out http://www.youtube.com/watch?v=C556EHYUijA , boost activated cutouts. You set it to your desired boost level and that's when it opens up.

02-07-2009, 05:12 AM
this is the same as the boost activated ones only it uses vacuum to open it since its on a n/a car. it uses a relay to trip the vsv solenoid whenever i want it to

02-07-2009, 06:37 AM
So you are doing this to have your own version of an 'unbolted' exhaust so you can run 14.7?

02-07-2009, 02:27 PM
Dont the newer cummins have something like this stock??

Many newer performance cars have systems like this nowadays. Nissan made a big deal of having one on the 2000 Maxima, even though my 1988 Nissan Cima Cedric had one. Pretty cool.

How do those throttle bodies stand up to exhaust heat, though? Especially in turbo apps?

02-07-2009, 03:35 PM
Dont the newer cummins have something like this stock??

No but the new ones do have exhaust brakes!

02-07-2009, 03:39 PM
I just always ran a cable for it.
Werd- JC Whipme has been selling them since the 70's.

02-07-2009, 05:04 PM
cable is ghey because you have to do it yourself, yes i want to run 14.7 and still take my girl out for dinner with a quiet car!

02-07-2009, 05:59 PM
I'll wait for you to test it out before I start collecting parts.. ;)

02-07-2009, 07:10 PM
Didn't 3kGTs come stock with such a system? Kind of like a TVIS for the exhaust

02-08-2009, 02:08 PM
Didn't 3kGTs come stock with such a system? Kind of like a TVIS for the exhaust

Probably, like I said, many newer performance cars have similar systems allowing them to be loud and growly, yet still have a quiet (and legal) cruise. And the '88 Cima Cedric I owned in Japan had an OE one.

02-08-2009, 10:00 PM
That's fucking cool Bugs.

02-08-2009, 10:07 PM
i might get to put it on next week. we'll see. im running stock unbolted right now!

02-10-2009, 06:33 PM
Similar concept as open air divorced wastegate. I have seen this setup (using 2nd wategate with a lot stiffer spring) on exhaust pipe of a high HP, high boost 3sgte. The second gate opens at high boost and vent out the exhaust.
But your setup is free :bigthumbu

02-10-2009, 06:41 PM
free wasnt the main thing, size and speed was. i cant use boost pressure to open it since its on a n/a car. the same design will work with an internal wastegate actuator for boosted aplications. the ct26 would be a good one since it open at 7 psi. the tb i used is 2.5" id. you could use a q45 tb (about 3.5") on a turbo aplication

02-19-2009, 05:25 AM

02-19-2009, 05:33 AM
What happened?

02-19-2009, 05:44 AM
1. well, first thing, there wasnt a good place to weld it on at, it ended up being too low to the ground and hitting bumps and stuff

2. the setup i had used vacuum to open the plate. mistake. in normal testing this worked because there was no load on the engine and i only used a short line. with the line to the back of the car the vacuum canister didnt hold enough vacuum to open the valve at wot.

i removed it tonight for redesign like tvis. use vacuum to close it and have it open all the time. toyota had it right to begin with.

i will prolly put it back on in a different spot at a 90* instead of 45* to save space and make it easier.

02-19-2009, 06:43 AM
I thought it would probably drag the ground.

joe's gt
02-19-2009, 06:54 AM
Yeah I was worried about that long of a line being able to actuate it. I'm sure with some modification you will get it working tho. Its a great idea and great ingenuity.

02-19-2009, 08:58 AM
it opened great at partial throttle, it just wouldnt stay open at WOT. i think i can fix the design if i can only find a place to mount it after the o2 sensors. if not ill just let my roommate have it as a boost actuated cutout, that design does work!

02-19-2009, 06:08 PM
cell phone pics


turtle didnt want to watch


02-21-2009, 05:14 AM
some scraping took place


02-21-2009, 06:39 AM
So what are you going to do then?

02-21-2009, 03:12 PM
redesign is a must. i might let andy design it since hes an engineer

02-21-2009, 07:11 PM
Could you mount it on the side of the pipe so it doesnt drag?

02-22-2009, 03:59 AM
yes, i had it kinda side mounted, the bad thing is it has to be past the 2nd o2 sensor and before the muffler, there is much place to put that in there, i will find a way though.

02-22-2009, 08:25 AM
Keep us posted buddy!!

joe's gt
02-22-2009, 09:06 PM
engineers are overrated!!! He probably can't design it any better than you can. passion is the key to design, not so much knowledge. I am an engineer too btw. No offense Andy.

02-23-2009, 03:37 AM
lawl. bens a pretty smart fella. not sure i would change anything except what we talked about making it vacuum to close and open with the spring.