jeffrey G

after getting my headers installed...I need to re-fabricate my true dual exhaust to fit it..but in the mean im runnin open headers..I like the sound cuz its mean as hell <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" /> ...im runnin no 02's and I havent tripped a code yet..and ive driven it about 10 miles..has anyone else just run open headers?

DONAIMIAN

iTrader: (18)

What kinda looks do you get at red lights when sitting next to people <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

jeffrey G

at idle it isnt that bad =)..u can keep it kinda quiet...but once you have to get up to speed its freakn loud <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

SSactionLs1

when i ran open headers my car felt like **** HP wise

35th LE SS

iTrader: (1)

I have dual QTEC cutouts right after my headers, so I run open headers at will. Man, it is so loud. I love the look on the import guys when the rev first, and I fire back with the mighty uncapped LS1.

RB185AFM

Correct me if I am wrong, but wont alot of cold air get sucked into the cylinders on deceleration. I thought that was a bad thing.

pimpmaro

Any of the experts on here know the theory behind the supposed danger of running open headers? Is it somewhat like shock cooling to an air-cooled engine?

DetroitZ

I ran open headers for a week. Don't know if I ever gained full hearing back <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

jeffrey G

is it bad to run open headers?..I only have to till monday so I think im ok..but im not sure

DETROIT_AREA_00_SS

iTrader: (7)

I had open Hooker longtubes for 3 months. No damage what-so-ever to the motor. I think damage can occur if it is very cold out and you are running open.

Sounds unreal. People just plain out stare as you drive by.

99blueblur

i ran open headers on my 68 firebird convertible w/ a worked 454(500 hp) the only damage i had was to my hearing. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

1BAD-SS

I'm not an engine guru or anything, but I have always heard that our engines need some amount of back pressure in order to operate w/out any problems. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

RB185AFM

I was told by a shop that cold air sucking up through the headers can cause damage to vales because of the hot metal getting hit with cold air. I believe it can cause them to stress fracture or crack. But I only have what I was told to go by. But it does make sense.

B18B1LS1

iTrader: (12)

Long tubes are plenty long enough to not cause any damage to the motor. It most likely will freak out the O2's though and run really rich.

Jeffrey

2001CamaroGuy

iTrader: (6)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1BAD-SS:
<strong> I'm not an engine guru or anything, but I have always heard that our engines need some amount of back pressure in order to operate w/out any problems. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">to that I say <img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> ..... <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />

ANY back pressure is a negative to maximum HP.

A little back pressure can "help" build a VERY SMALL amount of low end torque but you pay for it at high RPM.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RB185AFM:
<strong> I was told by a shop that cold air sucking up through the headers can cause damage to vales because of the hot metal getting hit with cold air. I believe it can cause them to stress fracture or crack. But I only have what I was told to go by. But it does make sense. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This happens if the "headers" are too short.

On shut down, air is able to travel back up the tubes. In long tubes, there is enough pipe to "warm" the air up before it gets the the valves. With short tubes (like the factory manifold), there is not enought pipe to "warm" the air up and it can cause the valves to cool/contract uneven and thus warp.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 1BAD-SS:
<strong>Long tubes are plenty long enough to not cause any damage to the motor. It most likely will freak out the O2's though and run really rich.

Jeffrey </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That would be more of a problem at idle than anything else......the dinstance from the O2 and the end of the collector is kind of short for the volume of exhaust comming out. At mid and high RPM, there is almost a constant out-flow.

A 12" piece of pipe on the end though will easily solve any O2 problems caused by air comming back in.


Chris

chino_man279

iTrader: (7)

I ran open exhaust manifolds on my 3.8L V6 for about 2 years without any problems....other than losing my hearing. I would think that even though the manifolds are short(stock ones), there is no damage becuase they are so restrictive. The cool air coming back into the pipe is slowed down enough that it is warm by the time it reaches the valves. With long tubes, it seems like there is plenty of pipe for this to occur also. I say the hell with the whole exhaust setup and just put a QTEC on the end of each Long Tube. <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" /> Put a resonator in the end of each one to quiet it down a little when they QTECs are closed. That is probably what I am going to do when I get QTPs on my Z. I don't mind the loudness though <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> .

RB185AFM

Looks like I will need some cutouts after my headers before my cats. Thanks for correcting me. <img border="0" alt="[worship]" title="" src="graemlins/gr_hail.gif" /> I was not going to run the cutouts right after the headers but now I can say good bye to my hearing. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

JimMueller

iTrader: (9)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SSactionLs1:
<strong> when i ran open headers my car felt like **** HP wise </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Same here, but I only had mine open for two days before the y-pipe was fixed.

jeffrey G

I still havent tripped any codes since I pulled the 02 sensors...whats happening to the computer since I dont have those in?

Tudds

iTrader: (4)

I ran open hooker LTs and it felt like the car was gonna fall apart... girls liked it though <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Good Vibrations