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Old 07-09-2009, 12:08 PM   #21
hoveringuy
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Quote:
Originally Posted by HighBoostin330 View Post
As AJ said, there is an easier way of just using software to fixed it than using hardware and cutting wires in your engine. Thank you for your suggestion.

Who has adjusted it through the instrument cluster?
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Old 07-09-2009, 12:31 PM   #22
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Who has adjusted it through the instrument cluster?
I would give it a shot. However, my car isn't here right now.

For those that would like to try it, I found this from Google search. Seems like you need to use Test 19 to unlock the tests, then enter into Test 20 and then change the correction factor.

http://forums.bimmerforums.com/forum...p/t-61718.html

From what I understand, it is correction factor based. So, X.XX (One . Tenths Hundredths). Similar to that of a dyno.

So go fill up your gas tanks at the gas station. Reset the OBC's MPG readout on the instrument cluster and the odometer mileage. Drive around the way you usually do until you have consumed about 50-75% of your gas tank. Go back to the gas station and refill your gas tank. Then it is a two step process.

1) Read out what the OBC says the MPG is.
2) Manually calculate what your MPG from the odometer mileage divide by the amount of gas you put in your car.

You will find that the MPG you calculate will be lower than what the OBC says. I am assuming that the correction factor is percentage based.

Correction Factor = 1 - [(OBC Readout - Calculated MPG)/Calculated MPG]

Can anyone confirm this hypothesis? My car isn't with me at the current moment. Thanks.
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Old 07-09-2009, 12:37 PM   #23
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Looking through the WDS the OBC doesn't have a discrete fuel consumption signal wire, it is computed by the cluster directly from data off the CAN bus.

If that is the case, the ONLY way to correct would be through software.

CAN is 1/2 the reason I converted my M54 to OBD1.
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Old 07-09-2009, 01:10 PM   #24
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Originally Posted by hoveringuy View Post
Looking through the WDS the OBC doesn't have a discrete fuel consumption signal wire, it is computed by the cluster directly from data off the CAN bus.

If that is the case, the ONLY way to correct would be through software.

CAN is 1/2 the reason I converted my M54 to OBD1.
The correction factor is in the instrument cluster, not the OBC. So using what you said, I am trying to change how the instrument cluster calculates the data off the CAN bus to display to the driver. What am I missing here?

In any case, I'll try this when I get my car back. Although I do have INPA to try it with if this doesn't work.

Have fun with your OBDI.
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Old 07-09-2009, 01:19 PM   #25
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Originally Posted by HighBoostin330 View Post
I would give it a shot. However, my car isn't here right now.

For those that would like to try it, I found this from Google search. Seems like you need to use Test 19 to unlock the tests, then enter into Test 20 and then change the correction factor.

http://forums.bimmerforums.com/forum...p/t-61718.html

From what I understand, it is correction factor based. So, X.XX (One . Tenths Hundredths). Similar to that of a dyno.

So go fill up your gas tanks at the gas station. Reset the OBC's MPG readout on the instrument cluster and the odometer mileage. Drive around the way you usually do until you have consumed about 50-75% of your gas tank. Go back to the gas station and refill your gas tank. Then it is a two step process.

1) Read out what the OBC says the MPG is.
2) Manually calculate what your MPG from the odometer mileage divide by the amount of gas you put in your car.

You will find that the MPG you calculate will be lower than what the OBC says. I am assuming that the correction factor is percentage based.

Correction Factor = 1 - [(OBC Readout - Calculated MPG)/Calculated MPG]

Can anyone confirm this hypothesis? My car isn't with me at the current moment. Thanks.
I will give it a try..

470km = 55 Liters of RON 98 gas

100km distance comes to 11.70 Liters (Real measurements)

My OBC shows: 9.7 L/100

Therefore my correction factor should be 1 - [(9.7-11.7)/11.7] = 1.17

Done in US friendly units:
1 liters = 0.264172052 US gallons
Therefore: 11.70L = 3 US Gallons / 62.5 miles
Comes to 20.8mpg average (aggressive driving + ac always on)
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Last edited by paraklas; 07-09-2009 at 01:25 PM.
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Old 07-09-2009, 01:32 PM   #26
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Originally Posted by HighBoostin330 View Post
The correction factor is in the instrument cluster, not the OBC.
The OBC is part of the instrument cluster on the E46
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Old 07-09-2009, 01:38 PM   #27
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Originally Posted by paraklas View Post
I will give it a try..

470km = 55 Liters of RON 98 gas

100km distance comes to 11.70 Liters (Real measurements)

My OBC shows: 9.7 L/100

Therefore my correction factor should be 1 - [(9.7-11.7)/11.7] = 1.17

Done in US friendly units:
1 liters = 0.264172052 US gallons
Therefore: 11.70L = 3 US Gallons / 62.5 miles
Comes to 20.8mpg average (aggressive driving + ac always on)
Please report back to see how accurate this method is. I wonder if the correction factor is based on driving style....????
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Old 07-09-2009, 02:10 PM   #28
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Quote:
Originally Posted by paraklas View Post
I will give it a try..

470km = 55 Liters of RON 98 gas

100km distance comes to 11.70 Liters (Real measurements)

My OBC shows: 9.7 L/100

Therefore my correction factor should be 1 - [(9.7-11.7)/11.7] = 1.17

Done in US friendly units:
1 liters = 0.264172052 US gallons
Therefore: 11.70L = 3 US Gallons / 62.5 miles
Comes to 20.8mpg average (aggressive driving + ac always on)
Having a correction factor of 1.17 would increase your gas mileage wouldn't it? That wouldn't make sense unless your car is more efficient now with the TS.

Quote:
Originally Posted by NickG@TechniqueTuning View Post
The OBC is part of the instrument cluster on the E46
Well that confuses things a little bit. hoverguy says calculation is done in the instrument cluster and not the OBC. However, the OBC is inside the instrument cluster. So how does the data get to the driver? OBC->Instrument Cluster->Driver?
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Old 07-09-2009, 02:16 PM   #29
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Quote:
Originally Posted by paraklas View Post
I will give it a try..

470km = 55 Liters of RON 98 gas

100km distance comes to 11.70 Liters (Real measurements)

My OBC shows: 9.7 L/100

Therefore my correction factor should be 1 - [(9.7-11.7)/11.7] = 1.17

Done in US friendly units:
1 liters = 0.264172052 US gallons
Therefore: 11.70L = 3 US Gallons / 62.5 miles
Comes to 20.8mpg average (aggressive driving + ac always on)
Okay, I'm not familiar with the metric system of gas consumption, but isn't 9L/100km equal to 26.13MPG. So if you calculated 20.8MPG, then isn't that a correction factor of 0.74?
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Old 07-09-2009, 02:33 PM   #30
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I think fuel consumpton is calculated in litres per 100 km and then converted to miles per gallon.
So in order to get the miles per gallon down, the litres per 100 km have to go up.
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Old 07-09-2009, 03:44 PM   #31
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I think fuel consumpton is calculated in litres per 100 km and then converted to miles per gallon.
So in order to get the miles per gallon down, the litres per 100 km have to go up.
Correct
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Old 07-09-2009, 05:52 PM   #32
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Quote:
Originally Posted by paraklas View Post
Correct
Quote:
Originally Posted by Maestroxl View Post
I think fuel consumpton is calculated in litres per 100 km and then converted to miles per gallon.
So in order to get the miles per gallon down, the litres per 100 km have to go up.
Okay, I guess that makes sense then. Let me know if it works then!
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Old 12-28-2009, 04:57 PM   #33
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Originally Posted by HighBoostin330 View Post
I would give it a shot. However, my car isn't here right now.

For those that would like to try it, I found this from Google search. Seems like you need to use Test 19 to unlock the tests, then enter into Test 20 and then change the correction factor.

http://forums.bimmerforums.com/forum...p/t-61718.html
I haven't been able to change my MPG correction factor through the instrument cluster; has anyone else been able to? Test 20 does not indicate any data with the tests locked or unlocked. Neither am I able to access sub-menus to input data. Has anyone else tried it with success?
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Old 10-06-2010, 11:15 AM   #34
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I think it's time to dig this thread up. What are you guys doing about OBC being way off?
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Old 10-06-2010, 12:26 PM   #35
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Nothing. The avg mpg and mte readouts are nice but not essential and I really don't use them anyway so I haven't taken the time to explore the correction factor mentioned above.
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Old 10-06-2010, 01:17 PM   #36
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I think it's time to dig this thread up. What are you guys doing about OBC being way off?
I haven't found anything I can do. I would really like my OBC to function as designed; I'm willing to pay for the option, but can't find a way to do it. It's one of the unadvertised trade-offs you have to put up with when you go FI.
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Old 10-06-2010, 01:26 PM   #37
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Just obtain it the old way by filling up, run, divide miles accumulated by the gallons after fill up.
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Old 10-06-2010, 01:32 PM   #38
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Just obtain it the old way by filling up, run, divide miles accumulated by the gallons after fill up.
Of course. But I want my OBC back.
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Old 10-06-2010, 03:28 PM   #39
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I tried the function 20 in OBC but it doesn't come up with a value
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