MAF scaling, showing you what i cam up with

[steve99]

temperature plays a significant part in maf scaling as air density changes with themperature so its best id your maf scaling data is collected at arround the same temperatures

its best to try to do it at the average temperatures for your climate.

your fuel trims will always vary with extremes of temperature as ecu compensates for air density changes.

[trdric]

well guys I fee like an idiot today and I guess I am probably not the only one that didnt figure that out

When ppl are talking about default values and all that stuff I was always wondering where they were getting those. I figured it out 2day.


On the mafscaling tool if do like me and use the LOAD LOG button with an OFT log nothing is going to be written down....

What you have to do is open your long once it is saved and remove the 3 1st row saying

Procede Data Log
OpenFlash Data File 1
14

once removed save your log again. Go back in the mafscaling tool and in the load log button you will see your categories and the default values mentionned before. If you do it by hand like I used to. The open loop is a real PITA.

Ya, I totally missed that and was doing all by hand up to today. I just figured that out....
Anyway back to datalogging I guess It will be a lot easier now..

[Koa]

thanks for the update man we all start somewhere

[Kodename47]

Originally Posted by trdric

The open loop is a real PITA.

Open loop should be easier. I would just try and ensure 3 full throttle pulls from around
2.5k in the same year in the same log and just ignore the 1st 5 lines of data and that should remove the difference as the AFRs drop as you get on it.

Personally I like to set the open loop fuel table to a flat AFR in thecWOT region to minimize error.

If you've already done the closed loop, once you've got your open loop sorted then smooth the end curve.

[trdric]

hey guys quick question. As for now all my datalog I always see a minimal change in my new maf scaling (less than 3% lets say). My LTFT when I am cruising are always in the +/- 5% range but when I am at idle at a light they always rise to more than 10-15%. Is it bad maf scaling or that is normal ?

Thanks
Eric

[Kodename47]

Originally Posted by trdric

hey guys quick question. As for now all my datalog I always see a minimal change in my new maf scaling (less than 3% lets say). My LTFT when I am cruising are always in the +/- 5% range but when I am at idle at a light they always rise to more than 10-15%. Is it bad maf scaling or that is normal ?

Thanks
Eric

A MAF scale will never be perfect in removing fuel error, it's always a best effort kind of thing. The longer your log, the much more reliable the end result will be.

There is also more than MAF at play at low IPW, namely injector latency. How bothered you are at reducing all the errors and the time you have to do it is up to you.

[Mr Nerd]

What would be the result of skipping CL and OL tabs all together and simply pasting your current MAF scale into the MAF Rescale tab and copying the new MAF scale created then pasting it to your tune in RomRaider?

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[Kodename47]

Originally Posted by Mr Nerd

What would be the result of skipping CL and OL tabs all together and simply pasting your current MAF scale into the MAF Rescale tab and copying the new MAF scale created then pasting it to your tune in RomRaider?

The result will be that the car will behave exactly the same as before.

[Mr Nerd]

Originally Posted by Kodename47

The result will be that the car will behave exactly the same as before.

So then which MAF scale should be pasted into the "current" MAF Scale field on the Rescale tab? Should it be the scale from the OL tab after scaling CL and OL?

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[Kodename47]

Originally Posted by Mr Nerd

So then which MAF scale should be pasted into the "current" MAF Scale field on the Rescale tab? Should it be the scale from the OL tab after scaling CL and OL?

The most accurate would be to rescale it 1st, then use the MAF scaling tabs in whichever order you like.

[Mr Nerd]

So after I have CL smoothed out, should I copy the new MAF scale from the CL tab and paste it into the OL current MAF scale field and then start smoothing?

I should be ready to copy to my ROM file at that point, correct?

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