Quote:
Originally Posted by Dimman
Would part of the problem be a tuning one? If we're using UEL, we're getting different scavenging effects on different cylinders, right? ... if we have individual cylinder fuel/spark trim and say EGT feedback, how much closer will an UEL get to EL power-wise when all the cylinders can be tuned better for their individual peak power?
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It's not so much the fuel or timing that does it, it's more that different cylinders will reach peak VE at different engine speeds. So lets say when cylinders 1&3 are at peak VE, cylinders 2&4 might only be at 95% of peak. When an engine with EL headers reaches peak VE it is moving more air than it could with UEL headers, but to either side of that peak the UEL headers could be tuned to maintain a fairly steady overall VE where VE with an EL header would taper.