Fuel mileage,and after market exhaust

[OB_rick phillips]

You say who cares, well I do , Im getting 46 mpg with my Busa on the hiway Its stock . Has anyone keep track of their mileage w/after market exhaust. Typicaly we would see a increase,is there one?

 

[OB_Martinm2]

More power comes with a price, probably about 10 less with a new pipe, but that's still just as good as my hamster fed car..

 

[OB_gsx1300rguy]

45mpg putting around 30mpg beating on it.Yosh tri-oval,bmc,airbox mod,yosh cams,+5+5+10 setting,mobil1 synthetic,check my mpg with fillups and computer.

 

[OB_CanuckBusa]

Not sure why this would reduce mileage at normal cruising speeds (vs. when flogging it). Let's say you richen the mixture with a new pipe, and make more power. When you are at cruising speeds that should mean you need less throttle to maintain a given speed. So the increase in fuel richness is offset by less throttle so maybe mileage difference is a 'wash'.

I could see if you are flogging it, and making more power, that your mileage would decrease. But at regular cruising speeds why would it decrease?

I like the fact that my friend on his R1 has to fuel up before I do.

 

[OB_SlowHand]

Rick, you won't see any mileage increase, since the stock setup flows well. A slip-on exhaust won't change mileage, since it doesn't require much if any richening of the mixture. Slip-ons don't do much for power, either, although some look and sound nice. A full system will drop mileage typically 10% due to the richer settings. Power usually goes up also, and there is usually a significant weight reduction.

 

[OB_SlowHand]

CanuckBusa, I'm not sure why, in theory, but I've done the full system on several bikes and I've always gotten the decrease in mileage, even when just stroking along.

If I had to guess, I'd say that most bikes come from the factory in an extremely lean condition for emissions reasons and just getting the mixture more correct will use a bit more fuel.