Quote:
Originally Posted by fooddude
Ah, didn't know the porsche had EL.
I know nothing about porsche and what parts it uses. All I know it's a boxer and 6cy and sounds unique when I hear them on the streets, lol. How should I know?..since I'm not a rich person and don't research cars I will never own. I was just assuming haha.  |
No worries, I'm not rich either. I just have certain priorities.
On the UEL/EL note... The "boxer rumble" is created by the extremely unequal runners of the exhaust manifold by nature of the boxer design. The exhaust pulses are fighting each other. The rumble you hear is exhaust pulses meeting in the header, and then a void where there is no exhaust pulse (repeated over and over). It should be called the "extremely poor header design due to the boxer engine layout rumble."
The EL smooths the sound because the exhaust pulses are in line and not "hitting" each other or fighting for space to flow through the exhaust.
On an inline 4, an unequal length header is nowhere near as unequal as a boxer because the exhaust ports are relatively close in distance to the collector. They are barely unequal in relative terms. So, you don't get a "boxer rumble."
The UEL will make more power in the dip because the UEL creates more back pressure, which is required for low end torque. However, a tuned car with a EL will always make more top end power because it is much more efficient. This is pure physics.