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Old 07-07-2009, 01:59 AM   #1
lkstaack
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ESS TS2 OBC Fuel Correction

I doubt that the ESS TS2 is able to provide a modified fuel injection pulse signal to the OBC so that it could accurately calculate MPG, but I thought that I would ask. Anyone know? I'ld e-mail ESS, but I suspect that others would want to know as well.

The reason I want an OBC that functions properly is the reason I want an ESS TS; keep the vehicle looking and operating like stock.
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Old 07-07-2009, 07:52 AM   #2
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I'd be interested in this as well. I think I've been told that some models can have the OBC recalibrated to be more accurate but I'm not sure of the procedure or which cars this applies to.
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Old 07-07-2009, 09:18 AM   #3
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I'm interested as well. My MPG calculation seems to be off by ~ 7mpg.
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Old 07-07-2009, 09:22 AM   #4
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Same here. My OBC is consistently off by 30%... would be nice to have it corrected.
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Old 07-07-2009, 09:44 AM   #5
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Old 07-07-2009, 10:26 AM   #6
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The OBC can be recalibrated using INPA quite easily. We typically do it on local installations. There is also a way of adjusting it directly through the instrument cluster menu.
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Old 07-07-2009, 10:43 AM   #7
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Originally Posted by Asbjorn@ESS View Post
The OBC can be recalibrated using INPA quite easily. We typically do it on local installations. There is also a way of adjusting it directly through the instrument cluster menu.
FYI Asbjorn, it can also be done within the MS43 and MS45 ECUs (and our software takes advantage of that ).
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Old 07-07-2009, 11:37 AM   #8
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FYI Asbjorn, it can also be done within the MS43 and MS45 ECUs (and our software takes advantage of that ).
I am fully aware of the scaling function within the MS43 and MS45, I even wrote a few R&D files calibrated for a few members on here, but beta customers complained about minor issues and we scrapped it since it can easily be configured in the cluster as well. I did not want to waste more R&D time on it at the time as new projects were waiting. There is something weird happening with MS45 especially that affects fuel control under part load when scaled more than 10-15%. On newer cars like the E92 M3 this function works perfect and is incorporated in our SC software.

Last edited by Asbjorn@ESS; 07-07-2009 at 11:44 AM.
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Old 07-07-2009, 12:41 PM   #9
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I am fully aware of the scaling function within the MS43 and MS45, I even wrote a few R&D files calibrated for a few members on here, but beta customers complained about minor issues and we scrapped it since it can easily be configured in the cluster as well. I did not want to waste more R&D time on it at the time as new projects were waiting. There is something weird happening with MS45 especially that affects fuel control under part load when scaled more than 10-15%. On newer cars like the E92 M3 this function works perfect and is incorporated in our SC software.
That's very strange that you're getting that kind of behavior. I've been able to rescale the fuel consumption output appropriately without any ill effects (I think on the order of 50-55%....basically the ratio of new injector size to original injector size).

Now that I think of it though, in MS45, you actually don't need to change the OBC consumption factor at all in the DME. With MS45, the consumption factor output is independent of the injector size. The consumption factor is derived from the mass fuel flow variable, before it becomes converted to injection time. Thus, if your mass air flow variable and target AFR values are correct (which both determine mass fuel flow), your consumption factor will automatically be correct (thus, no rescaling necessary).
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Old 07-07-2009, 10:45 AM   #10
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How can it be calibrated through the instrument cluster? Can you provide details/instructions?

Thanks
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Old 07-07-2009, 12:31 PM   #11
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Originally Posted by Asbjorn@ESS View Post
The OBC can be recalibrated using INPA quite easily. We typically do it on local installations. There is also a way of adjusting it directly through the instrument cluster menu.
How easily? Interested in this.
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Old 07-08-2009, 01:57 PM   #12
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There is also a way of adjusting it directly through the instrument cluster menu.
Please explain. I am interested too.
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Old 07-08-2009, 05:13 PM   #13
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The OBC can be recalibrated using INPA quite easily. We typically do it on local installations. There is also a way of adjusting it directly through the instrument cluster menu.
+11111 please do tell...wait, is this the "fix" where you have to do it every time the car is turned off and then on?
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Old 07-07-2009, 11:10 AM   #14
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My fuel consumption is crap already, no need to have the OBC verify it for me

on a side note, my cluster is off by 2-3mpg
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Old 07-07-2009, 11:28 AM   #15
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Can mine be done this way as well ? When I fill up it thinks my range is over 500 miles, even at the track yesterday, it was saying 32 mpg.
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Old 07-09-2009, 11:10 AM   #16
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More info on instrument cluster fix please stop leaving us in the dark...
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Old 07-09-2009, 11:58 AM   #17
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Here's my solution.

www.seattlecircuit.com
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Old 07-09-2009, 11:59 AM   #18
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Here's my solution.

www.seattlecircuit.com
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.
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Old 07-09-2009, 12:08 PM   #19
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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   #20
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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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