baily bill- but you have to remember these are stock highly computerized engines not drag engines. i'm not saying the drag engines are any less advanced hell they're more advanced but for a normal joe who disconnectes the exhaust from the headers back will jack up his engine unless he/she drills and taps a whole for the 02 sensors. no VQ will last long without 02 sensors. this might be where the "melting" is coming in.

 

The WB O2 sensors the ECU uses for A/F control ARE in the headers. You don't need the O2 sensors located in the cats, those are only for detecting cat efficiency. Geeesh, does anyone even look anything up anymore w/o spouting useless gibberish first?

 

don't be that guy man don't be "that" guy.

 

12-1400 F exhaust gasses are still going to be 12-1400F, whether they are exiting an EFI-controlled engine with a full exhaust, or a carbureted engine with 12" pipe stubs bolted to the exhaust ports.

And of course you cannot operate an EFI controlled engine without the required sensor inputs.

But that really has nothing to do with backpressure, does it?

bill

 

If you run open headers with this type of car you will end up hurting your motor no matter if people say its a myth or not. Drag cars are normally high compression or running turbos with dumps. If you run open headers with our compression ratio you'll end up burning a valve sooner or later. The car wasnt ment to run with out exhaust on it, if it was Nissan would have made it like 12 to 1 or some stupidly high compression ratio that would require high octane. If you really wanna take a chance an try it, let us know how long it last.

 

AJ from Perf Factory runs open dumps. Loud as H3LL!! But also fast as H3LL!! :-)

I have headers, tp's, dual exhaust, and couldn't even hear my car when he pulled up next to me! Lol~

 

I would really like to hear your explanation about why allowing the hot, high pressure exhaust gasses escape more quickly and efficiently is going to do any kind of damage to an engine.

bill

 

Apparently not.

bill

 

bill, finding someone with solid automotive knowledge on an automotive board is rare and refreshing these days. I know there are folks that know a lot about the Z here, but this thread is pretty much pointless.

 

open headers or even open test pipes is just to loud. I have a cut out after the Y pipe before the muffler and it sounds good IMO. I may be able to take afew pics if anyone wants some, also I have afew vids I can post if you want to hear how it sounds

 

Post them! Hows the butt dyno?

 

And it hasn't melted your engine?

bill

 

I was just talking to my Engine guy an he basically said the same thing. Its a dumb idea, it will eventually burn a valve cause the car does not have the compression nore the cam to run the open headers. Were talking about dumping right out of the headers here. He said it might not happen right away but it will lead to it sooner or later. It all has to do with how fast the exhaust exits the headers an how much heat it produces.

 

http://videos.streetfire.net/video/f...14012c5d18.htm

heres a vid. , it sounds better in person

 

So the gases will exit the head quicker when there is something pushing back (backpressure, get it?). Your engine guy shouldn't quit his day job.