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Originally Posted by psychorallyfreak
Pressure is pressure.
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Turbos are a heck of a lot more complicated than that... even if it was, that pressure comes from each port only when the corrosponding exhaust valve is open... if they're different lengths, the pulses get there at irregular intervals; result:slower spool, less efficient. Exhaust pressure wave tuning is another big consideration. This can help prevent exhaust reversion.
If 'pressure is pressure' was right, everyone would use log-type manifolds - easiest to make and most compact. Unfortunately you then get issues with certain cylinders getting more or less exhaust wastegated. Then you have a big issue with multiple exhaust pulses meeting in the same pipe, which causes excessive heat and therefore thermal expansion and turbulence.
anyways, what do you mean by f/b orientation? Front to back? The turbo flanges point towards the front of the car if thats what you mean...