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Old 02-18-2013, 02:21 PM   #41
System77
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Originally Posted by taylor192 View Post
Unless your car is tuned for 94 you're just wasting money and gas. Higher octane means harder to ignite, which means the ECU has to adapt to deal with it rather than being tuned specifically to take advantage of it.
good to know. Maybe Ill try lowering it a grade and see if I have improved mileage. Still a new owner here. Either way beats the crap out of my old 535i mileage
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Old 02-18-2013, 04:13 PM   #42
///M Powerd
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Unless your car is tuned for 94 you're just wasting money and gas. Higher octane means harder to ignite, which means the ECU has to adapt to deal with it rather than being tuned specifically to take advantage of it.
What grade are stock M3's tuned for? I know the owners manual says 91 min, but reading around I've seen that the North American ECU's were tuned to handle lower grades (89).
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Old 02-18-2013, 04:36 PM   #43
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What grade are stock M3's tuned for? I know the owners manual says 91 min, but reading around I've seen that the North American ECU's were tuned to handle lower grades (89).
I believe all e46 were tune to run 91 recommended. Don't quote me on that though.
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Old 02-18-2013, 11:22 PM   #44
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I'm barely still getting 300kms a tank. I'd be more than happy if I could get atleast close to 400.
Putting 91 octane for 80-85$ fill up is a pain right now
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Old 02-19-2013, 01:33 AM   #45
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I'm barely still getting 300kms a tank. I'd be more than happy if I could get atleast close to 400.
Putting 91 octane for 80-85$ fill up is a pain right now
Did u go through the list?
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Old 02-19-2013, 03:09 AM   #46
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I will soon, when the sunny days come out
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Old 03-01-2013, 03:47 PM   #47
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is normal engine temperature 80C or 95C?
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Old 03-01-2013, 04:22 PM   #48
///M Powerd
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Anywhere from 80-100C is fine.

On another note, I floored my M3 everywhere I went since I got my new exhaust and barely got to 300KM before filing up.

Last edited by ///M Powerd; 03-01-2013 at 04:29 PM.
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Old 03-01-2013, 05:05 PM   #49
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Anywhere from 80-100C is fine.

On another note, I floored my M3 everywhere I went since I got my new exhaust and barely got to 300KM before filing up.
Awesome! A few hundred $$$ a year is worth not driving like a grandma!
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Old 03-01-2013, 06:28 PM   #50
wbean
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cracked 425 km before the light came on today!

All stock except for rouge el diablo s54
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Old 03-01-2013, 10:09 PM   #51
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i was getting just over 600km on a tank in the summer. I stored my e46 for the winter but i recently pulled it out in february, man it was a cold couple weeks (-45 celcius w/ windchill). I drove it only for about 1 full tank and i was only going to get maybe 450 on the tank.

Thank you winnipeg winter!
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Old 04-02-2013, 08:46 PM   #52
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i was getting just over 600km on a tank in the summer. I stored my e46 for the winter but i recently pulled it out in february, man it was a cold couple weeks (-45 celcius w/ windchill). I drove it only for about 1 full tank and i was only going to get maybe 450 on the tank.

Thank you winnipeg winter!
How's tha winter treating ya? It was about 17c here on the weekend..
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Old 04-02-2013, 08:52 PM   #53
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How's tha winter treating ya? It was about 17c here on the weekend..
fantastic! - sold my facelifted 325ci in february for a 330ci ZHP! Flew to Calgary to pick it up and drove her home! The difference in power is really noticeable, however I think its safe to say that I probably will never see 600+km in the summer again
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Old 04-02-2013, 10:51 PM   #54
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fantastic! - sold my facelifted 325ci in february for a 330ci ZHP! Flew to Calgary to pick it up and drove her home! The difference in power is really noticeable, however I think its safe to say that I probably will never see 600+km in the summer again
NICE upgrade!
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Old 04-29-2013, 01:18 PM   #55
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I've got a 2000 323Ci and drive between Calgary and Edmonton Weekly. I usually cruise at 80 mph but hit 90/95 once in a while to pass trucks sloggin' up hills (people drive rather fast on Hwy 2). I get 425-450 MILES to the tank or 32 mpg. My car is originally from Hawaii, hense the mpg v. L/100km. Works out to a little over 700Km/tank. I have no mods and drive like I stole it.
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Old 04-29-2013, 01:22 PM   #56
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I'm going to change my thermostat when it arrives and will report back if it helps my gas mileage. I've been monitoring the temp and it seems to take too long to rise.
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Old 05-06-2013, 11:09 AM   #57
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I'm going to change my thermostat when it arrives and will report back if it helps my gas mileage. I've been monitoring the temp and it seems to take too long to rise.
Changed the thermostat yesterday. It is a 30 min job and doesn't require removing anything but 3 bolts and 1 hose clamp. The thermostat housing can be pulled out of the way enough to replace the thermostat and o-rings without removing the fan, shrouds, or intake.

Noticed my temps hit the same level, yet got there in about 1/2 the time. My gas mileage improved from ~16.0L to ~14.5L.

I'll admit I did not expect such a drastic difference. I knew taking longer to get to temp causes the ECU to dump more fuel... yet did not expect that much!

With how simple and cheap (< $50 for thermostat + 2 o-rings) this DIY is, anyone with a higher mileage BMW should do it. I'll make that $50 back in a month or 2 in gas savings.
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Old 05-29-2013, 03:12 AM   #58
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Figured out the problem with the poor gas mileage. 2 Fuel Injectors have gone bad, thus raw gas is just being spit out
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Old 05-29-2013, 10:30 AM   #59
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How did you figure that out? Easy DIY?
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Old 05-29-2013, 05:28 PM   #60
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How did you figure that out? Easy DIY?
Yeah. Went to change the spark plugs. 2/6 were soaked of gasoline. Thought it might be ignition coils not working properly so switched them around. Week later opened them up. The same 2 spark plugs were wet, so its the injectors
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