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08-17-2011, 08:00 AM | #1 |
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New Exhaust...Improved fuel economy?
Hey Guys,
Recently had an Eisenmann Race exhaust installed. Sounds fantastic. Couldn't be happier. Weird thing though, the fuel mileage is at 11.8L/100 km (or 31.8 mpg). Previously, I was getting numbers in the 12.2 to 12.9 L/100km (or 30.7 to 29.1 mpg). Is it possible that the engine is running more efficiently with the freer flowing exhaust? Thanks DC
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DR CHUCK
2009 E92 M3 Le Mans Blau on Schwartz. DCT. RAC RG63, KW V3, Eisenmann Race, AP Racing, Vorsteiner GTS5 Front Bumper, Vorsteiner GTS-V Rear Diffuser. |
08-17-2011, 09:33 AM | #3 |
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I noticed a very slight increase in mileage with my challenge xpipe but that quickly went in the tank with my tune. No one is getting 29 or 31 in these cars. Low 20s is about it if all freeway.
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02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW exhaust|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|apr gt 250 & splitter|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs| |
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08-17-2011, 10:39 AM | #5 |
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less back pressure to a point will be more efficient and can increase mileage. Usually right after you put on exhaust your mpg's go down because you drive faster enjoying the new sound lol
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08-17-2011, 11:15 AM | #6 |
Putcha ang ganda...
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same here... after putting a 200 cel x pipe i am currently at 20-22mpg when i had my oem xpipe i was at 17-19 same driving style for the last 2 years...
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08-17-2011, 12:20 PM | #8 |
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this is because of drone and more noice with the Eisenman. U control your foot, when u need to be quiter. In my case this is 60% of the driving. Im going under the drone level
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08-23-2011, 09:09 AM | #9 |
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Right, I am getting around 32 KMper gallon. I forgot to convert to miles. My bad, I thought that number seemed a bit optimistic. Divide 32 by 1.6 and you get 20. Thank you sir. (you're the one on the left)
In any case, I am getting around 11.8 to 12L per 100km vs 12.9 or higher prior to putting on the exhaust. I open it up regularly ie. I don't drive more conservatively for 2 reasons. One, the drone is at its worst around 2K RPM. So, I try to get it over 2500RPM as quickly as possible. Second, the sound of the exhaust at WOT is addictive. Bottom line, I love this exhaust.
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DR CHUCK
2009 E92 M3 Le Mans Blau on Schwartz. DCT. RAC RG63, KW V3, Eisenmann Race, AP Racing, Vorsteiner GTS5 Front Bumper, Vorsteiner GTS-V Rear Diffuser. |
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08-28-2011, 04:45 AM | #10 |
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Well the Eisenmann Race puts out its best noises below 5000 rpm. I just wonder if that encourages us to change up at lower engine speeds. So we're actually driving our M3s slower than before. Having said that I've not noticed better gas mileage with mine. I average about 21 to the UK gallon. Always have.
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08-28-2011, 10:03 PM | #12 |
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but if it can be a beast and get decent mpg we arent gonna complain. we want it all dont we?
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02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW exhaust|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|apr gt 250 & splitter|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs| |
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08-28-2011, 10:17 PM | #13 |
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on the highway our DRB Motorsports exhaust seems to get a wee bit better than stock..but in the city it is hard to keep foot out of throttle so therefore city is worse..when you get an exhaust you like, you want to keep hearing it, unfortunately the downside is poor gas mileage
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08-31-2011, 10:14 AM | #14 |
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It certainly wasn't one of my primary concerns but as a daily driver, it does come into play.
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DR CHUCK
2009 E92 M3 Le Mans Blau on Schwartz. DCT. RAC RG63, KW V3, Eisenmann Race, AP Racing, Vorsteiner GTS5 Front Bumper, Vorsteiner GTS-V Rear Diffuser. |
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09-01-2011, 01:07 PM | #15 |
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+100, it is a performance based factor... anyone can make a big motor produce big power but how efficient is it? This car is very efficient compared to almost every other sport car on the planet. Advancing the state of this art is one of the reasons I read this forum. But all too often the knuckle draggers are the loudest posts…
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