Quote:
Originally Posted by kees
I'm sorry but you're wrong. The DME has virtually nothing to do with this.
In a well-designed exhaust the pulse of exhaust of one combustion cycle extracts the pulse of the next combustion cycle. Effectively by going to too wide a pipe the resulting flow drag is too low and kills the velocity of the exhaust gases going out the exhaust.
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You are saying about normally aspirated engines (it is not exactly as you describe it - it is more dependence of pulses of pressure - but we have not enough space here on forum to touch all issues of na engines exhausts).
In turbocharged engine the turbocharger (or more precisely the turbine wheel) is exterminating the exhaust pulses. You can improve exhaust by fitting equal lengh manifold pipes but it is not so important as in na engines. After turbine housing you need only as low drag as possible. Of course car producers needs to obay the pollution and noise regulations and of course loud exhaust is not everybody taste and that's the reason why always you can improve factory exhaust.
I hope that my very basic english is enough clear (I'm still learning
).
Jan