Pass Laguna Seca sound limit in 3.2 seconds!
 

Well, in 3 seconds flat if you don't count opening the vacuum cap packet. I don't know why this simple method escape my mind but after thinking through how the electronic vacuum switch work then everything makes sense. The electronic vacuum switch turn on the vacuum to close the lower exhaust flaps when 13V pass through it. When the electrical current is gone the electronic vacuum switch release the vacuum through a lower opening metal hose as shown below.

http://img683.imageshack.us/img683/7532/pict7520.jpg

Plug up this metal hose then you will maintain vacuum ALL THE TIME and the lower exhaust flap remained closed regardless of RPM change or if Sport button is on or not. You do need to run the car with Sport button off first for 2 seconds to create the vaccum then your are good to go. This is super easy to do and you will pass 92 db sound limit at Laguna Seca. Sorry I did not think of this earlier but I will bring the packet of vacuum caps for those needed this Thursday at Laguna Seca ;)

Of course those of you want to control the exhaust note at your finger tip can still venture the mod as follow: http://www.6speedonline.com/forums/g...inger-tip.html

Here is picture of the vacuum caps. $2.37 with CA tax LOL

http://img14.imageshack.us/img14/7050/pict7548.jpg

Put the cap on the button metal vacuum release hose and you are good to go. You can install the cap without removing the electronic vacuum switch unit. Ignore my Jerry rigged wires for the other mod lol.

No more need to connect vacuum hoses together or any other cumbersome method just to track at Laguna Seca! :D I believe this method can be apply to other none GT3 models if you have similar vacuum switch.

http://img14.imageshack.us/img14/4771/pict7549.jpg

i assume you're talking about with PSE?

Looking forward to seeing you at Laguna this week

Let's hope that it's dry like last week

PSE ...??

WOW, are you bring your 2000 lbs GT3? That will be amazing to see! I will be at Laguna on 3/4 only. Hope to see you there

I'll second that. Thursday looks good, I'm driving Friday, too. Looks like I'll be practicing wet weather car control.

Mike, thanks for you work on the exhaust. I'll look for you Thursday.:D

You bet. One of these vacuum plug got your name on it :bigbye:

Mike, are you the one who is running the Sharkwerks bypass and still making 92db at Laguna?

-Doug

Yup, that's me. This quick mod will work and I don't lift at turn 5

Mike

Sweet! Lifting out of 5 screws up your whole lap, and then you have to spend the rest of the lap repassing everybody that passed you between 5 and 6.

But I won't be able to run Laguna probably until August with POC. Thanks for your help - will be installing the WEVO motor mounts this weekend.

-Doug

Sounds great Doug. Your time will be much faster without lifitng at turn 5. Have fun installing WEVO :)

I think you have me confused with someone else, I'm the tall guy with the midnight blue 6 GT3- motons, LFW etc but definitely not a 2000 pound car, hopefully under 3000 :)

I'm there Thursday only as well, was invited to instruct Friday but can't make it work

i was asking if it was porsche sport exhaust - question answered in this thread

Actually I did the Laguna Seca exhaust switch mod back in 2008, and was so much faster. Now I have the Sharkwerks bypass and am really looking forward to Laguna again.

Sorry I got you mix up with someome else. I will see you at Laguna. For sure to give you a point by at the start :)

OK. I am not 100% sure the PSE has the same vacuum valve as GT3. Let me know if you find it

Oh yeah baby. Now you can muffle the exhaust note even faster with the cap!

Guys, here is another way. Where Mike (mikymu) has added a rubber cap where the vacuum hose was connected, leave the hose on and disconnect the other end of the roughly 10 inch long hose. Plug the hose with a small machine screw and the job is done. The hose I plugged with the screw sucks the flap to open the exhaust, no suction no noise. The mod can be reversed in seconds.

Best,