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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 12-22-2016, 05:15 AM
SPDSKTR SPDSKTR is offline
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Recalibrating OBC MPG calcuations?

I've tried searching various terms in the E46 section (and on E46Fanatics), but have been unable to find an answer to this question.

See... with my supercharger, my car constantly reads that I'm achieving 40 MPG on the highway, when it's really more like 27 or 28 MPG. I know this is a really nit-picky thing to address, but I'd like to be able to swap over to my average MPG or DTE and get a more accurate reading.

Any help is appreciated!



To the tune of "ABC" by the Jackson Five:

It's wrong on the OBC.
Miscalcuated MPG.
And DTE.
Bimmer, get it right, car!

Last edited by SPDSKTR; 12-22-2016 at 05:18 AM.
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  #2  
Old 12-22-2016, 08:40 AM
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smolck smolck is offline
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You drive a really fast, really nice ZHP and all you can do is whine about your MPGs! Let me help you, when the gas gauge gets to "E", put more gas in it. Now go be a man!
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now, go burn your Man Card, and buy yourself a Camry....
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  #3  
Old 12-22-2016, 09:58 AM
SPDSKTR SPDSKTR is offline
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Location: Birmingham, AL, USA
 
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Quote:
Originally Posted by smolck View Post
You drive a really fast, really nice ZHP and all you can do is whine about your MPGs! Let me help you, when the gas gauge gets to "E", put more gas in it. Now go be a man!
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  #4  
Old 12-22-2016, 10:58 AM
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MalibuMafiaV MalibuMafiaV is offline
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Quote:
Originally Posted by smolck View Post
You drive a really fast, really nice ZHP and all you can do is whine about your MPGs! Let me help you, when the gas gauge gets to "E", put more gas in it. Now go be a man!
Pretty much.

I didn't buy my cars for MPG lol.
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  #5  
Old 12-23-2016, 05:02 AM
SPDSKTR SPDSKTR is offline
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I don't rightly care what MPG it gets. I already know that little statistic: 20 MPG average (which is worth it when E92 M3's are left scratching their heads ).

I just want my gauge to be more accurate. I know on the E36 Z3, there's a way to go into the OBC hidden menus and change it. It may be something that requires NCS Expert or whatever software.
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  #6  
Old 12-23-2016, 06:19 AM
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smolck smolck is offline
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Quote:
Originally Posted by SPDSKTR View Post
I don't rightly care what MPG it gets. I already know that little statistic: 20 MPG average (which is worth it when E92 M3's are left scratching their heads ).

I just want my gauge to be more accurate. I know on the E36 Z3, there's a way to go into the OBC hidden menus and change it. It may be something that requires NCS Expert or whatever software.
I got 22.3 MPG's on Tuesday when I went to Jackson MS. The rental lady hooked me up with a 2016 Dodge Charger Scat Pack Edition with the 392 (490HP) hemi. It was so fast it is hard to believe the fuel economy.

How fast? Well, put it this way, a truck was blocking me so when I pulled around him to finally pass him I was doing 65mph, I floored it and when I got to the front of the truck I was doing 95mph.

It sounded amazing, and for an automatic, had really fast ans crisp gear changes. But did I worry about MPG's? No. Just worried how long I could spin the tires on on ramps!
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Quote:
Originally Posted by Fast Bob View Post
now, go burn your Man Card, and buy yourself a Camry....
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  #7  
Old 12-23-2016, 06:56 AM
SPDSKTR SPDSKTR is offline
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Location: Birmingham, AL, USA
 
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Mein Auto: E46 ZHP TS2+ Coupe
Quote:
Originally Posted by smolck View Post
I got 22.3 MPG's on Tuesday when I went to Jackson MS. The rental lady hooked me up with a 2016 Dodge Charger Scat Pack Edition with the 392 (490HP) hemi. It was so fast it is hard to believe the fuel economy.

How fast? Well, put it this way, a truck was blocking me so when I pulled around him to finally pass him I was doing 65mph, I floored it and when I got to the front of the truck I was doing 95mph.

It sounded amazing, and for an automatic, had really fast ans crisp gear changes. But did I worry about MPG's? No. Just worried how long I could spin the tires on on ramps!
I've always wanted to race one of those.

4,400 lb. curb weight with 485 HP comes out to 9.07 lbs. per HP.

Considering my car has some minor weight reduction, I'm going to say it's safe to say my curb weight is somewhere in the 3,200 lb. range (stock coupes are 3,285 lbs. from what I've read). Assuming the car makes 375 BHP like ESS says it would, that would put me at 8.53 lbs. per HP.

9.07 vs 8.53.

When will you be renting one again?
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  #8  
Old 12-23-2016, 07:34 AM
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smolck smolck is offline
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Quote:
Originally Posted by SPDSKTR View Post
I've always wanted to race one of those.

4,400 lb. curb weight with 485 HP comes out to 9.07 lbs. per HP.

Considering my car has some minor weight reduction, I'm going to say it's safe to say my curb weight is somewhere in the 3,200 lb. range (stock coupes are 3,285 lbs. from what I've read). Assuming the car makes 375 BHP like ESS says it would, that would put me at 8.53 lbs. per HP.

9.07 vs 8.53.

When will you be renting one again?
Hate to burst your bubble, I've ridden in yours and I drove that beast for 9 hours. You'd get killed. Its one level down from a Hellcat. HP is one part, the torque of a 392 Hemi would make quick work of your 3.0 Bummer. Sorry.
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Quote:
Originally Posted by Fast Bob View Post
now, go burn your Man Card, and buy yourself a Camry....
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  #9  
Old 12-23-2016, 09:55 AM
Dave1027 Dave1027 is offline
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Quote:
Originally Posted by SPDSKTR View Post
I've tried searching various terms in the E46 section (and on E46Fanatics), but have been unable to find an answer to this question.

See... with my supercharger, my car constantly reads that I'm achieving 40 MPG on the highway, when it's really more like 27 or 28 MPG. I know this is a really nit-picky thing to address, but I'd like to be able to swap over to my average MPG or DTE and get a more accurate reading.

Any help is appreciated!
So, when you are running low on fuel, does the OBC say you still have more miles to go than you actually do?

What does the little vacuum gauge/mpg meter show when cruising on the highway?
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  #10  
Old 12-28-2016, 05:24 AM
SPDSKTR SPDSKTR is offline
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Location: Birmingham, AL, USA
 
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Double post. Sorry.

Last edited by SPDSKTR; 12-28-2016 at 05:38 AM.
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  #11  
Old 12-28-2016, 05:35 AM
SPDSKTR SPDSKTR is offline
I'm a DlCK! So what?
Location: Birmingham, AL, USA
 
Join Date: Sep 2011
Posts: 2,485
Mein Auto: E46 ZHP TS2+ Coupe
Quote:
Originally Posted by smolck View Post
Hate to burst your bubble, I've ridden in yours and I drove that beast for 9 hours. You'd get killed. Its one level down from a Hellcat. HP is one part, the torque of a 392 Hemi would make quick work of your 3.0 Bummer. Sorry.
I'm still good for burning some gas.

I ran into a Mustang 5.0 this past Friday night and thought, "Man... that car sounds so good." When I got behind him at a red light, I heard that distinct loping of some aggressive cams and simply concluded that this was not going to end well. I was correct. Cams on a 5.0 make a very significant difference on those Coyote motors.

Later that night, I ended up going against a 2010 Mustang GT (last year of the 4.6L) which had some bolt-on goodies. It was dead nuts even. He was ecstatic, I was saddened.

Then I remembered how much more fun it is to flog my car around twisty roads than a Mustang with a solid live rear axle.

Quote:
Originally Posted by Dave1027 View Post
So, when you are running low on fuel, does the OBC say you still have more miles to go than you actually do?

What does the little vacuum gauge/mpg meter show when cruising on the highway?
The DTE (Distance To Empty) estimate drops quickly as the tank level drops. If I'm not mistaken, the DTE is calculated by what the OBC reads as average MPG and current fuel level. On a fresh tank of gas, the DTE reads at 400+ miles, but I typically get 300 miles per tank.

I know there's some way to change a setting in the computer so it will read more accurately, but I don't know how to access it in the E46. I've found a post regarding the Z3, but that's an entirely different software set.
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