open headers?
open headers? i had a few questions as to my exhaust setup. I want to run the lightest and least amount of exhaust i can, but keep my 02's safe and reading accurately... or could i just do away with o2's run open loop and plug the bunge? The reason im asking is bc i have been running open loop for some time now plus it would save on money without having to buy new 02's. Im doing a cam swap so i will need a tune afterwards. I have been contemplating speed density tune, but dont have enough info or knowledge on the subject. Any replies, info or knowledge to help me out is much appreciated guys, thanks!
If you want to run 02's and open headers just add about 12" pipe to the end of the header that way you won't get unmetered air from the 02.
This way even if you do go SD you can use a wideband accurately as well and just plug whatever extra 02 bungs you have.
This way even if you do go SD you can use a wideband accurately as well and just plug whatever extra 02 bungs you have.
ok that was what i was wondering if the 14" turndown would be enough pipe. What about not running o2's and just running the turndowns in open loop? I dont understand exactly the benefits and or negatives on this.
Really depending on what you're using the car for. I'm assuming it's track only? I used to run open headers, but recently went back with a Y pipe and single Magnaflow. I did this to slow the car down just enough to run 7.0 Index though.
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Verdad Gallardo The length of tubing helps get the exhaust not to reverb on the body and behind the driver seat. Again IF not street use, then that is ideal.
what does speed density and open loop have to do with running open headers 
if you're running open loop throw the o2s away. It doesn't matter if you're running MAF, SD, Alpha-N or whatever.
if you're running open loop throw the o2s away. It doesn't matter if you're running MAF, SD, Alpha-N or whatever. oh yeah i know that. Im just trying to look at my options here.... and if i ran open headers and bought new 02's without extensions on the collectors the 02's wouldnt read right, but what i think im going to end up doing is just run open loop and plug the bunges on the headers.
good call I've been OLSD for over a year now, it's great. Finally I'm going back to closed loop with the DFI stuff... but I'll probably just tune it in closed loop with the wideband, then go back to open loop again 
I messed around with different length pipe with a turndown when I ran my car on motor. I had it open loop tuned so all the o2's were off.
I found, that there was no difference running 16, 12 and 8 inches of pipe that was consistant enough, compared to running just the turndown off the end of the header fwiw.
As long as the o2's are off, ditch everything. I ran the turndown, just so the bottom of the car didn't get as dirty... if not for that I wouldn't have even bothered with that to be totally honest.
I found, that there was no difference running 16, 12 and 8 inches of pipe that was consistant enough, compared to running just the turndown off the end of the header fwiw.
As long as the o2's are off, ditch everything. I ran the turndown, just so the bottom of the car didn't get as dirty... if not for that I wouldn't have even bothered with that to be totally honest.
I messed around with different length pipe with a turndown when I ran my car on motor. I had it open loop tuned so all the o2's were off.
I found, that there was no difference running 16, 12 and 8 inches of pipe that was consistant enough, compared to running just the turndown off the end of the header fwiw.
As long as the o2's are off, ditch everything. I ran the turndown, just so the bottom of the car didn't get as dirty... if not for that I wouldn't have even bothered with that to be totally honest.
I found, that there was no difference running 16, 12 and 8 inches of pipe that was consistant enough, compared to running just the turndown off the end of the header fwiw.
As long as the o2's are off, ditch everything. I ran the turndown, just so the bottom of the car didn't get as dirty... if not for that I wouldn't have even bothered with that to be totally honest.
Honestly noise, unless you're running at a track with a regulation is the last thing I would worry about. Turndowns, will keep teh car alot cleaner, and that's about it. And, honestly are really about all you need. Open loop the car, get rid of the O2 sensor's completely, then you can crank the timing up and run race fuel to control the detonation, pick up some power at the same time.
Honestly noise, unless you're running at a track with a regulation is the last thing I would worry about. Turndowns, will keep teh car alot cleaner, and that's about it. And, honestly are really about all you need. Open loop the car, get rid of the O2 sensor's completely, then you can crank the timing up and run race fuel to control the detonation, pick up some power at the same time.
I've always just gotten an bolt the right thread from the local lowes/home depot bin and cut it short, so it wouldn't protrude into the pipe. Never had a problem capping an O2 bung that way. Or, leave a dead sensor in the hole, and just don't hook it up to anything.