MAF Scaling - Open/Closed Loop Fueling info

[Skorov]

Originally Posted by steve99

yes stock front 02 sensor is not wideband so wont accuratly measure rich afr and its scale finishes at 12.1 stock scale.

you could put a proper wideband in second o2 position.

I do have an AEM failsafe gauge waiting to be installed. This would be a good excuse to get off my ass and do it.

Alternatively, what if I were to temporarily flash the stock fuel map and force open the wastegate? Take logs with 0 boost and then revert back after scaling is finished. Any risks doing that?

[steve99]

Originally Posted by Skorov

I do have an AEM failsafe gauge waiting to be installed. This would be a good excuse to get off my ass and do it.

Alternatively, what if I were to temporarily flash the stock fuel map and force open the wastegate? Take logs with 0 boost and then revert back after scaling is finished. Any risks doing that?

i dont have experience with FI so i dont know sorry

[Kodename47]

@Skorov why do you want to scale the MAF? If the car is running fine then there isn't really any need to.

[Skorov]

Originally Posted by Kodename47

@Skorov why do you want to scale the MAF? If the car is running fine then there isn't really any need to.

I installed the perrin 3" intake. When I flashed the provided scale, I got quite a large LTFT (15%). So I figured I better rescale the whole thing.

[D-VO]

there is a table in ecu flash called "front oxygen sensor scaling" that you can adjust to come pretty close to the wideband sensor. The thing is you need to log a known good wideband and the cars O2 at the same time.

[1Cor10:23]

Kudos @steve99, @Kodename47, @vgi - will give this all a try come late spring. Thanks for adding to the community!

[kodyo]

Originally Posted by vgi

next time you should tag me so i'd get a notification

sorry, mate, there was a bug which displayed a wrong column name for the error. What you actually did not specified is the "CL/OL Status". It's been fixed and will be in the next release.

Still getting same error even with the correct CL/OL Status logged and attributed.

Log attached, any ideas?

[vgi]

Originally Posted by kodyo

Still getting same error even with the correct CL/OL Status logged and attributed.

Log attached, any ideas?

https://www.dropbox.com/s/vkp0dy8ea9...%20V2.csv?dl=0

I just loaded your file into 1.6.3 open loop and closed loop, no errors. I left everything at default except the CL/OL Status which I set to 2. See the pics. (the POL fueling table and MAF scaling are obviously from some of my tunes I opened)

[kodyo]

OK, awesome, thank you so much! I'm going to try again tomorrow to see if I can get it working correctly. Thanks for checking!

[Wayno]

If we're scaling to use E85, should we do it on straight 98, or 44/6L 98/E85 for 10% E like US 91 fuels?

For straight 98 it makes sense to scale on straight 98.

[steve99]

Originally Posted by Wayno

If we're scaling to use E85, should we do it on straight 98, or 44/6L 98/E85 for 10% E like US 91 fuels?

For straight 98 it makes sense to scale on straight 98.

If you have guaranteed E content E85 like united then you can just scale using that fuel if thats all your going to run.

The oft guys probably scaled using something like E70 content then jacked the Open loop scetion of the scale about 5% or so to make sure it always ran on the rich side even if E% went high.

Ig you going to use E flex then your going to have to compromise and scale on the average e% and see how it copes with the variance then maybe jack the ol scale a bit if you find it runs lean on increased e%. Its always going to be a compromise without a flex fuel setup. Foortunatly ethanol is a forgiving fuel on NA motors.

[DocWalt]

Hey all, I did some logging with the OTS Stage 2 UEL tune from OFT, and I have a bit of a dip in AFR as seen here:


I did some maf scaling and it pulled quite a bit of fuel in the dip, but now I have a touch of tip-in knock correction (-0.69 IIRC) when going WOT.

I played around with the EL comp table (lowered the values in the table in the rich spot, they were at 3.1) because I figured that would lean it out, but it seemed to have almost no effect.

What's the best way to get rid of the rich spot without making a big sag in the maf scaling?

[Kodename47]

Originally Posted by DocWalt

Hey all, I did some logging with the OTS Stage 2 UEL tune from OFT, and I have a bit of a dip in AFR as seen here:

I did some maf scaling and it pulled quite a bit of fuel in the dip, but now I have a touch of tip-in knock correction (-0.69 IIRC) when going WOT.

I played around with the EL comp table (lowered the values in the table in the rich spot, they were at 3.1) because I figured that would lean it out, but it seemed to have almost no effect.

What's the best way to get rid of the rich spot without making a big sag in the maf scaling?

Engine Load Comp only works in closed loop AFAIK. The best way to lose the rich spot is to adjust the actual open loop fuel table

[DocWalt]

Originally Posted by Kodename47

Engine Load Comp only works in closed loop AFAIK. The best way to lose the rich spot is to adjust the actual open loop fuel table

Bah. I was afraid you'd say that. Shouldn't be too hard, I know how far it's off and I can remove the dip from my maf scaling.

I have to admit, this is all a bit overwhelming coming from Megasquirt using one VE table and one IGN table, heh.