Quote:
Originally Posted by ChopsQube
Digging up a somewhat old thread, b
Exhaust systems on the other hand should help both performance and efficiency. For improved top-end performance you would most likely go with larger than stock pipes, a 4-1 header, larger free flowing cat, muffler and delete the resonator altogether. For efficiency on the low-end, you would probably go with a Tri-Y long tube header (4-2-1), same size or possibly smaller than stock pipe and free flowing cat, resonator and muffler. Both systems should utilize mandrel bends for near constant flow speed.
Again, I am no expert on any of this. This is all just information I have picked up over the years from all types of sources. To me, it seems to make sense, but like I said, I could be and possibly am wrong.  |
Key words underlined and bolded.
first, nothing new there and second it really has no relevance to ecomodding.
As stated before 'top end or wot (wide open throttle) are achieved maybe 1/10 of 1% of all normal driving much less eco-driving. So 'tuning' for that is really just about presonal feelings and not honest day to day driving results
Now if you are hotrodding or racing, great advise.
as for as your low end comments, again key word is 'stock'. Unless you have a rusted out system, there really would be no financial payback in changing uot an exhaust system.
I presonally feel that in 95% of all cars sold (let me limit this to US mamufacturers) in the last 15 yrs have an effeceint exhaust system for conservative driving.