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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-26-2008, 11:52 PM   #1
monkeyjuice5150
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So what is with your MPG with the 3.46 diff now?

As the title said, after you installed your 3.46 diff. What is your MPG now. Normal driving of course.

State your other mods, and tranny.

I have a full catback, with headers. Intake and 3.46 diff on a 5speed.

I'm doing around 15.5 MPG. Pretty low. Used to be around 21-24 MPG with the 2.93 Diff.


Can someone also answer this question for me. If I was to get a chip. Would it be able to fix my MPG to accomandate the headers, and gears?
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Old 08-27-2008, 07:26 AM   #2
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Seems like you lost a lot more than usual... With headers, aa flash, and the 3.46 I was getting ~21mpg.
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Old 08-27-2008, 07:33 AM   #3
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i got a full cat back...intake and a 3.46 diff and i went from 21/23 mpg to 19/21 mpg....and this is what my instrument cluster is telling me...i really cant tell a difference...i been filling my car up once a month like before when i had my old diff....surely worth the upgrade...regardless of gas prices
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Old 08-27-2008, 07:37 AM   #4
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and to answer the question about the chip saving you gas...since it raises the red line a bit it probably will save u some gas but it wont be much....
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Old 08-27-2008, 11:28 AM   #5
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In the summer i am averaging 29.9 mpg with 3.46 diff, supercharger @ 8lbs, headers, exhaust, pulleys, and others. In colder weather I average around 33mpg.
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Old 08-27-2008, 12:46 PM   #6
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wow, is there something wrong with my car then? It's been like this for almost a year now.
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Old 08-27-2008, 12:50 PM   #7
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In the summer i am averaging 29.9 mpg with 3.46 diff, supercharger @ 8lbs, headers, exhaust, pulleys, and others. In colder weather I average around 33mpg.
Wow! "That's Incredible!" You must have no hills, wind and only freeways there.

I can't get any better than 26mpg with conversative driving.
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Old 08-27-2008, 01:25 PM   #8
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5spd 325, gruppem, shark, RE pullies, 3.46. lots of city driving to work, some highway. 21.5mpg

hung have u done spark plugs lately? injectors? maybe ur ish is gunked up.
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Old 08-27-2008, 02:06 PM   #9
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Quote:
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5spd 325, gruppem, shark, RE pullies, 3.46. lots of city driving to work, some highway. 21.5mpg

hung have u done spark plugs lately? injectors? maybe ur ish is gunked up.
Yeh, I did replace my spark plug with the colder one from when I had the Turbo. Should I put that back to regular spark plug?

I did had injectors at the time too, but since then I put back my oem one.

Probably want to replace the spark and maybe clean the injector huh?
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Old 08-28-2008, 01:11 PM   #10
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depends on the milage u have on the plugs and injectors i guess, but yes.

hope the turbo didn't eff anything up for u, and all ur seals are still good.
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Old 08-28-2008, 11:49 PM   #11
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depends on the milage u have on the plugs and injectors i guess, but yes.

hope the turbo didn't eff anything up for u, and all ur seals are still good.
I think it actually did, ever since I took it off, my engine been giving me problems. Pulled a couple codes.

I need to get a compression tool to test the heads and all.

Just been lazy with it lately since it just sits in the garage most of the time.
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Old 08-29-2008, 09:06 AM   #12
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that sucks.

o well as long as it has enough power for ya, eff the mileage, u have a DD right? ha.
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Old 08-29-2008, 11:10 AM   #13
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Yeh, I did replace my spark plug with the colder one from when I had the Turbo. Should I put that back to regular spark plug?



yes put it back. the "coldness/hotness" level of the sparkplug determines how quicker or slow is dissipates the heat it gets. it helps to know how to read the plugs when tuning.


here's a quick overview that'll give you the gist of it and why you need to correct heat range:

http://www.globaldenso.com/PLUG/basi...nge/index.html
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Old 09-01-2008, 03:44 PM   #14
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i just drove 3hrs, 200 miles, 29mpg.
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Old 10-05-2008, 09:24 PM   #15
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this is late, but I'll log my mpg with my mods....an easy 30+mpg on the highway for me
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Old 10-06-2008, 02:52 AM   #16
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I just got done cleaning my CAI filter. I gained 2mpg extra. LOL I guess it makes a world difference.
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