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Old 04-16-2009, 02:19 AM   #1
bzinn 1
 
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got better milage with silencer

Well got bored this last month and tired of the drone from GReddy tic so I put in the silencer,my last two tanks of gas I am now averaging 36-36.5mpg where as the tanks before it I only averaged 33.5-34mpg,same amount of gas,same type of driving both tanks all freeway shor t of about 20 miles a tank,driving about 60mph.

Has anyone else had their milage go up by putting in the silencer and any thoughts on why,I use the same gas from same station every fillup,record miles religiously,and only other mod is Ingen CAI,tires same air pressure,temps outside pretty much the same all month.......

Car does not seem to respond any slower of the line or passing with it in so I am leaving it in ,CAI is louder than exhaust now,but that is ok,it got old on the freeway trying to listen to radio.
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Old 04-16-2009, 08:33 AM   #2
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This isn't all that surprising. Modern vehicles use backpressure to improve fuel economy. Basically it's designed for the pressure caused by the normal exhaust so when it recycles exhaust gas the valves only open a little on the intake cycle. When there is not as much pressure more fresh air is used, so more fuel is required.
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Old 04-16-2009, 08:36 AM   #3
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Did you reset your ecu after installing any of your mods?
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Old 04-16-2009, 11:51 AM   #4
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Wow, I grew up in University Place.
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Old 04-16-2009, 12:12 PM   #5
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backpressure..
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Old 04-17-2009, 10:57 AM   #6
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thinking about putting a silencer on but it's bigger than the OEM one, hope it reduces the sound, I just don't like the muffler previous owner got for the yaris, cheap as hell!
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Old 04-17-2009, 10:03 PM   #7
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Ok that does make sense it is gettign a bit more backpressure and it is helping.Think I am gonna keep it in too......It is not as punchy off the line to say 15mph,but after that it feels the same as without it,and it is so much quieter,only real volume comes under load with pedal down to floor.

Yes reset the ECU on every new item on car,also own a tC and am used to doing this every time I add something,drives me nutty to have to do it too especiall on the tC as I always have to reset everything on the stereo.....takes a good hour to retune it all back in.
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Old 04-17-2009, 10:04 PM   #8
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Also thanks for the answers guys.....I thought I was going a bit loopy or something,may put stock one back on to see if I break the 35mpg mark,if so it will stay on and sell the Greddy.....lol
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