i have one for sale, with cel fix. also a apexi vafc2 with pnp harness pm me for details!

 

I ricer, never been accused of that before
[/quote]

The term "back pressure" is a theory . Which has been proven wrong numerous of times.

 

I ricer, never been accused of that before
[/quote]

The term "back pressure" is a theory . Which has been proven wrong numerous of times.
[/quote]
and that qualifies me as a ricer,. ? HMM normally a "ricer" would be concidered someone who has a bunch of senceless BS stuck on their POS $100 car and a fartcan muffler to make it loud.

 

no but if it were a group of guys all talking about exhaust and you walked up and started talking about back pressure i would assume you know nothing of which your talking about. don't give out wrong information, to me that is also a "RICER" tendency giving out information you obviously know nothing about is dumb, or something you think you know about.. with nearly 6k in posts i figured you would do some research on this site as well. The term "Back pressure" needs to be tossed to the curb just like the term "turn over" everyone uses these terms and it seems like no one actually knows what they mean. do some research before you hand out false information is all im saying .

 

being ASE certified since 1997, i think i might know what i am talking about. 2 friends that own their own shops, i think they know what they are talking about... are you an engineer or an engine designer?. do you manufacture engines?? im just wondering how your the expert here

 

I obtain 3 out of 8 ASE certifications, I attended Honda pact for 5 years . I used to assemble motors at wheels boutique on bird and 72nd . I have knowledge in building motors been around it my whole life man. So please explain back pressure then.

 

Its about maintaining the exhaust velocity, pressure helps to maintain heat which helps maintain pressure and velocity. One thing that will cause the exhaust gas to slow down is a sudden decrease in temperature, which is one reason why auto makers don’t try to cool the exhaust manifold. The other thing that can cause a decrease in flow velocity is rapid expansion and turbulence, like going from a small passage (like the exhaust port in the head) to a 6-inch pipe. A smaller-diameter pipe geometry will tend to keep the flow rate up, but it will also lose heat more quickly (less exhaust gas per linear inch of pipe). However, a large pipe will slow the velocity due to expansion. Worse still, the exhaust is constantly cooling from the moment it leaves the cylinder, meaning it’s getting denser and slower. See the problem here? It’s all about compromises. The proper pipe size is going to be influenced by the flow rate (volume rate, which is related to RPM and engine displacement), exhaust velocity (again related to RPM), exhaust temperature (constantly changing, and as high as 2,000&Mac251;F, if I remember right), and undoubtedly an array of other factors. All of this is dependent on the application: is this a street car, a race car, or something in between? Where will the engine spend most of its time? Idle, full throttle, part throttle?

if you can keep the exhaust gases moving in the exhaust pipe, they will cause a small reduced-pressure area behind the closed exhaust valve, in the exhaust. This happens because the gases have momentum. They move away from the valve, creating a localized reduction in pressure. When the exhaust valve opens, this reduced-pressure zone will help evacuate the burnt gases from the cylinder.

 

pardon my late responce, i was at the race track all weeknd