# Dr.Jekyll Exhaust = works well on new setup **URL:** \ **Category:** SON240sx Automotive\ **Created:** [November 16, 2008, 4:47am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909 "2008-11-16T04:47:22Z")\ **Posts on this page:** 20\ **Page:** 2
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [November 17, 2008, 12:21pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/21 "2008-11-17T12:21:05Z")
Nah man, the car is tuned with Autronic SM4…but will be replaced soon with something new. ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [November 17, 2008, 12:36pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/22 "2008-11-17T12:36:48Z")
hahahahaha that song was perfect sorry my narration wasn’t as good as yours! ---
**Author:** ![schwiin\_27](https://avatars.discourse-cdn.com/v4/letter/s/ecb155/32.png) [@schwiin\_27](https://forums.speedlife.net/u/schwiin_27)\ **Post date:** [November 17, 2008, 3:34pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/23 "2008-11-17T15:34:39Z")
with a turbo do you not have some required back pressure ? does the open exhaust have to be a certain distance back from the exhaust side of the turbo…if its to close to the turbo /manifold,on decel, could you not suck back the outside air… ive seen enough cars with cracked manifolds or exh leaks that results in burnt valves due to bringin in the colder outside air what kinda money did you shell out in the end? what would the difference be is you dumped it after the cat? thanx for your time ---
**Author:** ![face](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/face/32/5504_2.png) [@face](https://forums.speedlife.net/u/face)\ **Post date:** [November 17, 2008, 4:22pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/24 "2008-11-17T16:22:24Z")
How much power is to be had versus the common 3" exhaust with no cats or resonators or restrictive mufflers? Your non dumped exhaust seems to have all of these, which is attributing to a larger gain when the dump actually opens. Not trying to bash the work (which is beautiful) but it is probably easier and cheaper for most people to use a run of the mill 3" exhaust and test pipe, unless you are having trouble with coppers, in that case this is an awesome system. ---
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [November 17, 2008, 5:52pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/25 "2008-11-17T17:52:07Z")
> [@NYSpeed Dippers](https://forums.speedlife.net/t/nyspeed-dippers/19115/28): > > with a turbo do you not have some required back pressure ? does the open exhaust have to be a certain distance back from the exhaust side of the turbo…if its to close to the turbo /manifold,on decel, could you not suck back the outside air… ive seen enough cars with cracked manifolds or exh leaks that results in burnt valves due to bringin in the colder outside air > > what kinda money did you shell out in the end? > > what would the difference be is you dumped it after the cat? > thanx for your time Nah man, the turbo is not sucking any air back into the system…I’m not even remotely concerned with that. As for the money I’ve shelled out…got no friggin idea. If you are interested in some fabrication work, give Sasha a call at SGM. One thing I will say though is I often don’t worry about things cost when I build cars. I’ve learned enough to know that the only way I can get the results I want it to not event worry about it. The difference after the cat would undoubtably be less power. The point of the dump is to have zero restriction. Adding restrictions will defeat what I was hoping to accomplish. ---
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [November 17, 2008, 5:58pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/26 "2008-11-17T17:58:17Z")
> [@Official Riddle Thread...](https://forums.speedlife.net/t/official-riddle-thread/19150/2): > > How much power is to be had versus the common 3" exhaust with no cats or resonators or restrictive mufflers? Your non dumped exhaust seems to have all of these, which is attributing to a larger gain when the dump actually opens. Not trying to bash the work (which is beautiful) but it is probably easier and cheaper for most people to use a run of the mill 3" exhaust and test pipe, unless you are having trouble with coppers, in that case this is an awesome system. Even a 3" exhaust will certainly have more restriction that this design. But that’s really not important. The point was not to find a cheap option, the point was to build a system that had the very best of both Worlds. With the dump closed, the car idles as quitely as a stock Honda Accord. Cruising the car is almost inaudible, perfect for having a conversation or listening to tunes. Open, the car transforms into a race car, loud, responsive and obnoxious. The value in this system is not the cost or that there are cheaper alternatives. The fact that I can have two different cars and switch between then in lest than two seconds from the push of a button was the experiment…and the dyno is proof positive that it has worked. ---
**Author:** ![Theo23](https://avatars.discourse-cdn.com/v4/letter/t/43a26b/32.png) [@Theo23](https://forums.speedlife.net/u/Theo23)\ **Post date:** [November 17, 2008, 10:39pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/27 "2008-11-17T22:39:13Z")
> [@coming soon.....](https://forums.speedlife.net/t/coming-soon/19155/2): > > With the dump closed, the car idles as quitely as a stock Honda Accord. Cruising the car is almost inaudible, perfect for having a conversation or listening to tunes. Open, the car transforms into a race car, loud, responsive and obnoxious. I guess noone here knows who Dr.Jekyll **OR** Mr. Hyde are… So Dan, the valve is a tight seal? No leak noise at all? I’ve always wondered that about those units. ---
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [November 18, 2008, 3:39am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/28 "2008-11-18T03:39:11Z")
> [@Happy Birthday Sup(poop)ra-Pimp.](https://forums.speedlife.net/t/happy-birthday-sup-poop-ra-pimp/19158/9): > > I guess noone here knows who Dr.Jekyll **OR** Mr. Hyde are… > > So Dan, the valve is a tight seal? No leak noise at all? I’ve always wondered that about those units. I no eh Theo? I thought it was pretty self explanatory. Yeah, the valve stays closed pretty tightly… no exhaust leak is heard in the car. ---
**Author:** ![Fobwall](https://avatars.discourse-cdn.com/v4/letter/f/7ea924/32.png) [@Fobwall](https://forums.speedlife.net/u/Fobwall)\ **Post date:** [November 18, 2008, 5:31am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/29 "2008-11-18T05:31:50Z")
Who is Jerkyl? ---
**Author:** ![simplemind7](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@simplemind7](https://forums.speedlife.net/u/simplemind7)\ **Post date:** [November 18, 2008, 7:15am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/30 "2008-11-18T07:15:29Z")
damnit, i feel old for knowing what you’re talking about. exhaust looks awesome! ---
**Author:** ![alesserfate](https://avatars.discourse-cdn.com/v4/letter/a/f6c823/32.png) [@alesserfate](https://forums.speedlife.net/u/alesserfate)\ **Post date:** [November 22, 2008, 8:05pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/31 "2008-11-22T20:05:36Z")
I likey… hmmmmm… ---
**Author:** ![Martino](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/martino/32/5674_2.png) [@Martino](https://forums.speedlife.net/u/Martino)\ **Post date:** [November 22, 2008, 9:56pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/32 "2008-11-22T21:56:11Z")
Soundss dirtyyyyyyyyy dan ---
**Author:** ![Hurricane](https://avatars.discourse-cdn.com/v4/letter/h/e9bcb4/32.png) [@Hurricane](https://forums.speedlife.net/u/Hurricane)\ **Post date:** [November 22, 2008, 10:47pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/33 "2008-11-22T22:47:04Z")
Nice numbers… as expected with an open exhaust. I’ve always wanted to run a remote valve like that but I’ve always with held since they are not street legal… but I guess most cars aren’t really truly street legal anymore anyways. Nice fab work Sasha. ---
**Author:** ![FOOT](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/foot/32/5578_2.png) [@FOOT](https://forums.speedlife.net/u/FOOT)\ **Post date:** [November 23, 2008, 1:29am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/34 "2008-11-23T01:29:36Z")
great downpipe. so whats your excuse when a cop checks your exhaust with the dump lol ---
**Author:** ![nd4boost](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nd4boost/32/5627_2.png) [@nd4boost](https://forums.speedlife.net/u/nd4boost)\ **Post date:** [November 27, 2008, 8:50pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/35 "2008-11-27T20:50:14Z")
first off awesome piece and great write up, couple of questions when the dump is open are you running a limp mode full rich due to the fact that your o2 bung is on the exhaust side? if that is your o2 bung i think more power could be had (dump open) if the 02 was positioned closer to the turbo also have you done a pass with the dump closed to see if you lost any power compared to the orig down pipe? just asking caz im interested in doing somth similar? ---
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [November 28, 2008, 4:27am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/36 "2008-11-28T04:27:02Z")
> [@I SUCK DICK and MAKE 5HP per liter PLUS I HAVE A SWEET TIGER tattoo club](https://forums.speedlife.net/t/i-suck-dick-and-make-5hp-per-liter-plus-i-have-a-sweet-tiger-tattoo-club/19290/30): > > first off awesome piece and great write up, couple of questions > when the dump is open are you running a limp mode full rich due to the fact that your o2 bung is on the exhaust side? if that is your o2 bung i think more power could be had (dump open) if the 02 was positioned closer to the turbo > also have you done a pass with the dump closed to see if you lost any power compared to the orig down pipe? > just asking caz im interested in doing somth similar? I think you need to do mor reading on what an O2 sensor **actually** does, and the differences between open or closed-loop. I think if you did some more reading you would be able to answer you own questions. ---
**Author:** ![nd4boost](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nd4boost/32/5627_2.png) [@nd4boost](https://forums.speedlife.net/u/nd4boost)\ **Post date:** [November 28, 2008, 7:32pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/37 "2008-11-28T19:32:49Z")
no i dont think i do. i was trying to be nice and help you out but f-it when your dump is open you are most likely running an open loop operation causing the motor to run full rich due to the fact that a large % of the exhaust is not passing the o2. at the very least the o2 is getting an incorrect reading. also the god offal Y connection that is used to bypass the dump is causing much more back pressure than a normal down pipe or even an equally sectioned Y so the majority of the time you are running less power than a full exhaust but ya mabie i will do more reading on what an O2 sensor actually does, and the differences between open or closed-loop. ---
**Author:** ![Martino](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/martino/32/5674_2.png) [@Martino](https://forums.speedlife.net/u/Martino)\ **Post date:** [November 28, 2008, 7:40pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/38 "2008-11-28T19:40:33Z")
^^ If you noticed he had different runs, with and without the dump open. Dyno charts are posted above… ---
**Author:** ![nd4boost](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nd4boost/32/5627_2.png) [@nd4boost](https://forums.speedlife.net/u/nd4boost)\ **Post date:** [November 28, 2008, 8:07pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/39 "2008-11-28T20:07:32Z")
i dont think you understand what im saying there is no base line #'s the only way this would work properly with the dump open is if the o2 bung in the picture is not used or is for a wideband or somth and the actual o2 is before the section shown ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [November 28, 2008, 8:23pm UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/40 "2008-11-28T20:23:35Z")
> [@OFFICIAL Buffalo Sabres Thread](https://forums.speedlife.net/t/official-buffalo-sabres-thread/25170/686): > > i dont think you understand what im saying there is no base line #'s > the only way this would work properly with the dump open is if the o2 bung in the picture is not used or is for a wideband or somth and the actual o2 is before the section shown I think before you start trying to argue with Dan about tuning questions, or anything for that matter, you should first learn some grammer and sentance structure. You just make yourself sound like a grade 3 retard when you post and I don’t think you want that kind of image, do you? Ok bye! [Previous page](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909.md?page=1) [Next page](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909.md?page=3)