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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > fuel economy drop with turbo tuner.



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      04-22-2007, 11:18 AM   #1
fotios335i
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fuel economy drop with turbo tuner.

Ive had it for like 5 days and the fuel aconomy has dipped fast.Granted I have been driving it hard but it went from 19.9 to 19.3 already.It seems like it might get worse.What is everyone else getting.Im curious as to what it will get driving like a civilized human being.Oh well, its very,very fun though.
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      04-22-2007, 11:22 AM   #2
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well if your flooring it since you got it that is the reason...but .5 mile difference is nothing to be worried about... specially if you are really flooring it a lot.
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      04-22-2007, 12:26 PM   #3
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On my car it was the same as stock when cruising, dropped a bit when flooring it a lot.
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      04-22-2007, 12:28 PM   #4
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The harder you push it, the thirstier it gets...
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      04-22-2007, 01:19 PM   #5
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Takes fuel to make power. I am only getting 14.1mpg so far on my stock 335i in 1600 miles of driving.
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      04-22-2007, 02:01 PM   #6
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Last tank of gas I drove my stock 2007 335i the exact same way as my 1995 540i (w/ dinan chip). The daily route I take is 15% city 85% hwy. So for over 300mi, I get exactly 1 extra mile per gallon 23mpg w/ 335i vs 22mpg w/ 540i. After some break-in time the fuel economy may improve slightly.
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      04-22-2007, 02:05 PM   #7
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.3, .5, .8....alles machts nichts (doesn't matter). Just enjoy the ride.
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      04-22-2007, 02:09 PM   #8
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Quote:
Originally Posted by MacAttack View Post
.3, .5, .8....alles machts nichts (doesn't matter). Just enjoy the ride.
sounds good to me.
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      04-22-2007, 05:35 PM   #9
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To run more boost, you need to use more fuel. You can't have your cake and eat it too.
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      04-22-2007, 05:41 PM   #10
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Quote:
Originally Posted by BoostedBMW View Post
To run more boost, you need to use more fuel. You can't have your cake and eat it too.
some proceed customers claimed they gained mpg.
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      04-22-2007, 06:02 PM   #11
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Quote:
Originally Posted by fotios330i View Post
some proceed customers claimed they gained mpg.
It really depends on the load. Some Turbo Tuner customers have gotten better gas mileage as well and that's only obvious if they're not always doing WOT runs.

Same can be true with the piggyback units.
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      04-22-2007, 06:43 PM   #12
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Quote:
Originally Posted by fotios330i View Post
some proceed customers claimed they gained mpg.
That's while cruising, not WOT. There is no extra boost when the car is in vac.
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      04-22-2007, 06:47 PM   #13
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The TT shouldn't increase your gas mileage, it only takes effect under boost. The procede/xede can lean the car out during part throttle for slightly better gas mileage.
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      04-22-2007, 07:08 PM   #14
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I've had absolutely NO change in gas millage since getting the turbo tuner. 17.9 MPG and I drive it pretty hard
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      04-23-2007, 02:42 AM   #15
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Quote:
Originally Posted by hotrod182 View Post
Takes fuel to make power. I am only getting 14.1mpg so far on my stock 335i in 1600 miles of driving.
the 335 6sp loaner i drove with 4500 miles at- 70 mph
basicly flat freeway got me 30.1 mpg!! slowed to 65 mph and got 31.2 mpg
(same distance) VERY impressed!!

my current 330 xi i have to granny drive to get up to 26 mpg average... 6000 miles on it
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      04-23-2007, 03:13 AM   #16
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i dont see how customers can see they get better gas mileage with adding performance enhancers, should be eating more to make more hp
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      04-23-2007, 07:49 AM   #17
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Quote:
Originally Posted by JockmyStylez View Post
i dont see how customers can see they get better gas mileage with adding performance enhancers, should be eating more to make more hp

As stated above:
"The procede/xede can lean the car out during part throttle for slightly better gas mileage."

FI cars are usualy tuned rich form the factory for an extra margin of safety, so that's an easy place to look for performance. The fringe benefit is that this also improves fuel efficiency.
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