Does GIAC flash reduce gas mileage a lot?

n2disco · 02-05-2010, 07:38 PM

I just got my car flashed with GIAC, and it seems like the car is really thirsty now. I have been driving like a grandma and I still go threw gas really quickly. Is this normal, or does the car need to get used to the flash?

Donald-335i · 02-05-2010, 07:45 PM

no clue how the flash works but its most likey just getting use to the ecu..

Mr. 5 · 02-05-2010, 08:16 PM

GIAC runs richer AtoFs but only when you get on it.
It should be the same freeway gas mileage.

Kelvin1000 · 02-05-2010, 08:20 PM

Actually, I don't know if the GIAC has a "lean cruise" feature implemented or what but I have noticed an increase in my average MPG. I can get about 38MPG at highway speeds pretty consistantly. Here is a video demonstration:

[u2b]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/A2fS4Xb8XpU&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/A2fS4Xb8XpU&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/u2b]

n2disco · 02-05-2010, 08:59 PM

Has it always been like that or did it take your car a little while to get used to the flash?

tom @ eas · 02-05-2010, 09:34 PM

Quote:

Originally Posted by n2disco

I just got my car flashed with GIAC, and it seems like the car is really thirsty now. I have been driving like a grandma and I still go threw gas really quickly. Is this normal, or does the car need to get used to the flash?

The DME will continuously adapt to conditions/driving habits, but mileage shouldn't suffer at all.

Of course, this doesn't count if your right foot is always on the floor.

FLA 335 · 02-05-2010, 09:49 PM

Quote:

Originally Posted by tom @ eas

The DME will continuously adapt to conditions/driving habits, but mileage shouldn't suffer at all.

Of course, this doesn't count if your right foot is always on the floor.

enrita · 02-06-2010, 01:20 AM

the AFR ratio is unchanged up to 3200 rpm so while cruising the car has stock like mileage.

BIAW2007 · 02-06-2010, 02:12 AM

Depends on how you drive really

02-05-2010, 07:38 PM	#1
n2disco New Member 2 Rep 20 Posts Drives: 07 e92 335i Join Date: Nov 2009 Location: san jose iTrader: (0)	Does GIAC flash reduce gas mileage a lot? I just got my car flashed with GIAC, and it seems like the car is really thirsty now. I have been driving like a grandma and I still go threw gas really quickly. Is this normal, or does the car need to get used to the flash?
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02-05-2010, 07:45 PM	#2
Donald-335i Banned 191 Rep 3,588 Posts Drives: The Hoes Crazy! Join Date: Nov 2008 Location: Central NJ iTrader: (13)	no clue how the flash works but its most likey just getting use to the ecu..
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02-05-2010, 08:16 PM	#3
Mr. 5 Modder Raider 758 Rep 8,633 Posts Drives: M3 Join Date: Apr 2007 Location: Surf City, HB iTrader: (31) Garage List 2007 e90 335i [8.00]	GIAC runs richer AtoFs but only when you get on it. It should be the same freeway gas mileage. __________________ e36 M3 Coupe, e36 325i Sedan e90 335i--SOLD Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM
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02-05-2010, 08:20 PM	#4
Kelvin1000 Major 253 Rep 1,297 Posts Drives: 2019 BMW M2 Competition MT Hoc Join Date: Sep 2007 Location: Miami, FL iTrader: (4)	Actually, I don't know if the GIAC has a "lean cruise" feature implemented or what but I have noticed an increase in my average MPG. I can get about 38MPG at highway speeds pretty consistantly. Here is a video demonstration: [u2b]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/A2fS4Xb8XpU&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/A2fS4Xb8XpU&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/u2b]
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02-05-2010, 08:59 PM	#5
n2disco New Member 2 Rep 20 Posts Drives: 07 e92 335i Join Date: Nov 2009 Location: san jose iTrader: (0)	Has it always been like that or did it take your car a little while to get used to the flash?
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02-06-2010, 01:20 AM	#8
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	the AFR ratio is unchanged up to 3200 rpm so while cruising the car has stock like mileage. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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02-06-2010, 02:12 AM	#9
BIAW2007 New Member 0 Rep 8 Posts Drives: 335 Join Date: Jan 2010 Location: Novi, MI iTrader: (1)	Depends on how you drive really
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