My experience with open Long tube headers on an ls1
#45
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You can't compare open headers/no open headers without doing a tune for each case. Your air/fuel ratio will change from one to the next at WOT and also at WOT your front O2 sensors don't do a thing. Your car is taken out of closed loop then.
#46
I can honestly say my car does not sound anything like any boat I have ever heard
#48
HeaderWrap
Loving the site, looking for info on my first LS1 project coming soon. I'm Jason Pope & own XPW that manufactures header wrap & turbo blankets. Wrapping your pipes does for sure create a lot more horsepower & some extra back pressure, mainly your burning off those extra fumes in the exhaust. You will get more out of wrapping your pipes, than you will ceramic coated headers (Dyno shows that,not just because I'm in that business) and much cheaper. The curves in your headers are different to create more or less back pressure for certain engines or uses. We always wanted more back pressure on shorter dirt race tracks, for the low end torque to create faster speed. I'll be back for info soon I'm sure!
#49
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http://www.hondacivicforum.com/forum...ts-wrong-3064/
http://my.prostreetonline.com/forums...php?t-1639.htm
http://mechdb.com/index.php/Exhaust_back_pressure_myth
http://www.dsmtuners.com/forums/freq...kpressure.html
http://www.rx8club.com/showthread.php?t=28945
http://www.fullsizechevy.com/forum/g...sure-myth.html
http://my350z.com/forum/intake-exhau...k-for-n-a.html (the long post about half way down the page)
http://www.miata.net/garage/KnowYourCar/S4_Back.html
#50
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More backpressure? From external wrap? I'm sure as an industry professional what you meant to say here is "improved exhaust gas velocity".
#52
TECH Senior Member
My experience with open Long tube headers on an ls1
( exhaust gas velocity helps combustion chamber scavenging to help torque, back pressure hinders it )
Last edited by joecar; 12-04-2015 at 10:42 PM.