This Investors Hub Member nailed it!
Posted by: Trueheart
In reply to: walknmannv who wrote msg# 102807
Date:11/6/2007 4:26:37 PM
Post #of 102820
My post was in regard to those claiming 25% and thereabouts mileage increase.
I understand engines and how they operate. Open pipes are illegal (on the street) and are not efficient as the output must be "tuned" to minimize back pressure throughout the operating regime of the engine. That includes RPMs, loads and conditions.
Engineers cannot completely eliminate back pressure, as you assert. The muffler is there to do just what it claims to do and that takes up power but with proper design can actually help the engine "breathe" more efficiently.
Yes, a percent of two is possible but not the claims ranging up to 25%. If I was the pres of GM I'd be tacking those on all my heavy-bodied SUVs and laughing at the CAFE rules.
Trueheart
you are correct sir, back pressure is essential to my knowledge and the claims of cars or trucks experiencing a 25% increase in fuel economy is well, just a flat out lie.
I recommend people call some of the dealers from the Aero website and ask them if they will even guarantee a 5% increase in fuel mileage and I bet you will not find one of the dealers to guarantee that for you.
What I bet you will find is that some of those dealers will point you towards a different product or muffler other than the Aero muffler, how do I know this? I called a few dealers off of Aero's website and as I suspected most were not impressed with the muffler and pointed me towards other mufflers they offered.
