Exhaust Bypass Valves

[boggtown]

Hey guys, I just bought these electric bypass valves and will be doing a write up along with dyno tests over the next couple weeks. I bought the valves and will have them installed within a week or two. I contacted PorscheDoc and got the low down on doing some dyno runs. So everything is falling into place. I bought dual 2 inch valves from Charles (http://www.badlanzhpe.com/index.html) and they are the best value out there if you want sound and maybe some top end (we will find out when I dyno them). I spent a total of $270 and that is a drop in the bucket compared to a $1000 muffler, and it will be louder and resonance free... if I want it to be. Any feedback will helpful. Let me know what you think.

Expect Updates!

[boggtown]

I finished installing everything, except the welding of the valves. What I did was take all of the trunk carpet out, everything. Its pretty simple, no biggie. Then you just lift up on the O2 sensor grommets (they are only in there by friction fit), and you get underneath the car and push the wire through where the O2 sensor wire goes (not hard at all, its really close and the opening is big, but not big enough to fit the big end through). Then you pull like crazy on the gigantic grommet that leads torward the engine, ok, your done with the trunk for now. Put your car in service mode (super easy), and if you want, you can use a grabber or screwdriver to push the wires through to the engine bay, I waited a couple steps though. Next, you undo 4 plastic "nuts" that hold the carpet on the firewall and take the carpet out. Undo 9 bolts and take the metal sheild off. Now take a chisel and punch a slit into the grommet that leads into the cabin (about a half inch will do). This is when I pushed the wires though into the engine bay. I put some heat sheilding over the wires just in case (they run directly the same path as the shifter cables) and pushed the wires through the slit in the grommet ( felt like giving birth to a plug, its pretty tight, but I could have made the slit bigger). Pull all your extra cable (exept what you need to reach the valves) and begin to slide it underneath the console. You need to push kinda hard to get it to be under there. Run it all the way to the bins (you will have very little cable left, seriously, just enough to reach the button). Now you can start on the switch (I used the switch it came with, but I might update to a porsche switch to go in the center console by the ashtray, thatd be sweet), I put my switch in the batwing. You need to dremel your way very carefully, it took me a while to get it right. The way the switch is, you need to remove all the connectors that were in the switch to get it in the hole you cut. So remember where the wires went! Once you get your switch to fit pop it in and reconnect the wires. I used inline wire taps to get power from the cigarette lighter. I had to remove my cd player because I left my tools at college (my torx bits), if you DO have torx bits, the 100% easier way to do it would be to undo the 4 torx screws holding the enitre assembly in place (take off the cover to the side, they hold the lock button, ect..., and you will see 4 screws, once they are out you can take out the entire thing), then just run the wires from the cig lighter down the back of the console and pull it through where the bat wing went. Use butt connecter to connect it to the switch and push it all back into the dash, and you are good to go. Put everything back together (except the trunk carpet, you want the muffler guy to be able to get how much cable he needs). I pulled the wire up to the O2 sensor grommet so it will not be in the way when I drive to the shop tomorrow.

I will take pictures of the install and some sound clips and video. I just need to figure out how I can upload them so you guys can see it.

[986Jim]

Cant wait to see/hear it.

[macsak]

sorry i'm not catching what these valves do

the holidays must be dulling my thought processes :)

aloha

steve

Hey guys, I just bought these electric bypass valves and will be doing a write up along with dyno tests over the next couple weeks. I bought the valves and will have them installed within a week or two. I contacted PorscheDoc and got the low down on doing some dyno runs. So everything is falling into place. I bought dual 2 inch valves from Charles (http://www.badlanzhpe.com/index.html) and they are the best value out there if you want sound and maybe some top end (we will find out when I dyno them). I spent a total of $270 and that is a drop in the bucket compared to a $1000 muffler, and it will be louder and resonance free... if I want it to be. Any feedback will helpful. Let me know what you think.

Expect Updates!

[Devin - CT]

Steve,

It allows for the optionality of straight pipes while retaining the stock muffler. The choice is your with the use of the switch. I was thinking of doing the same but with use of the old 911 heater boxes. Seemed a bit much though in terms of fabrication. I like the idea of the electronically controlled valve - just wondering how to route the exhaust with the Y pipe option. Love to see pics of how this will be done. Good luck Boggtown.

[boggtown]

Done. It sounds amazing. Just fantastic. A real racecar sound. Heres some pics and video. I used my camera with the video function, so its not the best quality sound. I think the wind from the valves made it sound boomier than it is, you can tell that when the valves arent directing the air backwards its clearer. It sounds a lot better when your actually driving. I will get some flybys later. I prefer to only have the valve open about an 1/8th or 1/4, its plenty loud and you get a "tighter" sound.

http://www.youtube.com/watch?v=9ryr05thbvM

http://www.youtube.com/watch?v=vpXhUN6-vsk

http://aycu16.webshots.com/image/7815/2004...62479657_rs.jpg

http://aycu32.webshots.com/image/7351/2004...81596698_rs.jpg

http://aycu06.webshots.com/image/7165/2004...91526492_rs.jpg

http://aycu17.webshots.com/image/7096/2004...78225640_rs.jpg

http://aycu30.webshots.com/image/8749/2004...72633378_rs.jpg

http://aycu14.webshots.com/image/6533/2004...49717705_rs.jpg

http://aycu03.webshots.com/image/8922/2004...02544669_rs.jpg

http://aycu10.webshots.com/image/8089/2004...78184603_rs.jpg

[986Jim]

They aren't going to do much for power, they are T'd directly off the pipe. You need to make a Y pipe with them coming off there. Having them has a hard T off the stock exhaust pipe is gonna just create a whole lot of noise..

I doubt your going to gain much in the way of power with that either..

I put one on a guys talon that was making about 480whp and made a Y right off the downpipe before his "cat" and it picked up about 40hp or so from the exhaust not having to travel through the exhaust. Thats a turbo car however...

[boggtown]

Ya, im not going for power, these cars are pretty much done as far as upgrading for power. You may pick up 10 HP after several mods, but nothing too impressive. Im getting the car dynoed in a couple weeks to get a base line and to see what difference the valves make, if any. But I love the sound, Its B.A. (you dane cook fans will get that one)

[Rodger]

Once you've got a good quality in-car video, please post it. The youtube video is pretty raw. I'm always looking for a little more exhaust noise from my Boxster, but nothing harsh or like a fartcan.

[boggtown]

Once you've got a good quality in-car video, please post it. The youtube video is pretty raw. I'm always looking for a little more exhaust noise from my Boxster, but nothing harsh or like a fartcan.

Here is a drive by.

http://www.youtube.com/watch?v=08-uX9z_Rg4

I will take an inside cabin video tomorrow, its not that bad at all at 1/8th open. You still get great sound and you get some resonance from 2-3 grand, but its quiet when cruising at those speeds. Above 3 grand and theres no resonance and little cabin noise besides the engine.

[Stew]

I don't like the sound at all!

It doe's not sound like a porsche at all.

My 2000 Boxster S as standard has a good sound from inside the cab.

The sound from your exhaust system is a little harsh.

Does it exit out into the exhaust tip or just under the car?

Stew <_<

[boggtown]

The first drive by was half or full open, the second one (at the 1 min mark) was 1/8th open and what I consider to sound very good and still Porsche like. It exits out under the car.

[boggtown]

Heres an inside video. 1/8th open http://www.youtube.com/watch?v=_bPO868KT_M

[Komplex]

Don't listen to the haters, I think it sounds great. B)

Did you notice any Torque loss now that you don't have much back pressure? I'd imagine that the 1/8th open gives a nice balance of HP without to much torque loss.

[savowood]

Did you get any dyno results? I'm considering doing this to my car. I have the 3.4 in there and I think I have too much back pressure. I'd like to be able to do this so it's quiet on the street, then when I'm at an autocross event or at the track, I can open it up.

-Michael