RomRaider

Please use this thread to discuss. This is available in RR as of v0.43.

Caution for Turbochargers
If you run this with a Turbocharger that spools up quickly, you will overflow the Load variable in the 2500 to 3500RPM range since Load/Torque builds too quickly for the stock ECU code to handle and will result in extremely lean AFRs and engine damage.
Datalog and make sure you are not getting close to the 1389 Load (mg/stroke) limit.
If you are, delay the onset of boost a little bit.

Superchargers and NA tunes are OK to use with this.

I've changed the MAF Scaling tables to a 16x16 format instead of 256x1 because it will be easier to edit. Changes to the MAF Scaling table should generally only happen in percentages and any fine tuning should be taken care of in the main Fuel map.

As mentioned below, the copy/paste functions in RR don't seem to work intuitively for me. Use the attached MAF spreadsheet to copy/paste the values to/from Excel/RomRaider.

1. Select all yellow highlighted cells
2. "Ctrl + C" to Copy
3. In RR, click the top-left cell, then "Ctrl + V" to Paste


Wiki : https://sites.google.com/site/openms41/romraider/maf
Please check this out and let me know if the wording/content still needs to be clarified.

MAF Tuning Spreadsheet - thanks to "ba114" - viewtopic.php?f=42&t=12453

Agree that this makes it easier to view the table, however might make it slightly more difficult to do the transfer function copying and pasting.

Yeah, I agree. RR is a little finicky about copy/paste right now so please use the Excel sheet I attached to the first post.

So are you meaning there that once a person chooses 2048 kg/hr Mode, then he needs to divide all of the values in the bins by 2 for the purpose of establishing the starting point that correlates to the factory MAF scaling table before commencing fine tuning the table with values higher than 1024? If you mean something other than that, obviously I missed it...

Is the point of this to be able to install a resistor and have a given voltage correlate to a higher airflow so that load values can be calculated correctly when airflow exceeds the limit of the stock MAF?

Sorry if I'm getting this completely wrong!

Yes, exactly. If in doubt, just copy/paste the values from the spreadsheet. More MAF Scalings will be added in the future. But they will just be a starting point.

And correct again. Only if you add a MAF that reads more than 1024 kg/hr at 5V or you use a resistor to 'trick' the MAF into simulating a bigger one that may exceed 1024 kg/hr at 5V.

Wow, this is an excellent feature!

Do you expect to have a basic scaling for a stock MAF plus a specified amount of added resistance available as a starting point to choose at some point, maybe like iamanonymous' setup or something? (although if I remember right he might not be actually changing his MAF scaling so maybe another example is a better one)

(redacted in light of new information)

Yeah, the spreadsheet is setup so you can make a copy of the tab, and paste into it the MAF Scaling from a ROM and it will automatically populate the other stuff for viewing and pasting back into RomRaider. So as and when different MAF setups are generated/tested they can be added to this master list. I suggest someone try a stock MAF with a 2.2Kohm resistor and see how much more airflow that gets us.

I have a car with an 803 MAF 2.2Kohm resistor + 42 lb injectors that I will eventually tune (after fixing the clutch pivot pin) and share the findings on. But my day job takes up a lot of my time and desire to do other stuff.

I believe the problem with copy and paste into tables is due to extra fields in the first row of data which should only contain the table type.
If you make your changes in the spreadsheet and then try to copy them to RR it will most likely fail.

You can worlk around this by first copying the data from the spreadsheet into a text editor.
A 2D table for example:

What you won't normally see is that there are "tab" formatting characters in the first line up to the end of the line (eol). These all need to be deleted. On the first line place the cursor after the ] and press Shift-End to highlight all the tabs to the end of the line, then press delete.

Now select all (Ctrl-a) and copy this data and paste it into the RR table.

Is this the best document to study in order to learn about developing a MAF scalar?:

http://www.romraider.com/forum/download/file.php?id=5305

This process is geared towards the Subaru ECUs. The MAF tab is looking for these Logger parameters, which if any are missing, it will not work.

• COOLANT_TEMP = P2
• AF_CORRECTION_1 = P3
• AF_LEARNING_1 = P4
• ENGINE_SPEED = P8
• INTAKE_AIR_TEMP = P11
• MASS_AIR_FLOW = P12
• MASS_AIR_FLOW_V = P18
• AFR = P58
• CL_OL_16 = E3 or CL_OL_32 = E33
• TIP_IN_THROTTLE_16 = E23 or TIP_IN_THROTTLE_32 = E54

The DS2 logging def for BMW is missing most of these.

I've searched high and low for an 803 MAF scale. Most of the tunes I've been buying for customer cars require it with a 2.2k resistor, like yours. Their tunes are locked, of course, but one day I would love to try tuning my own FI S52 with a known good MAF map

Do you have a leaf blower? Hook up both in series and measure voltage on both at a couple different flow rates. The difference should be a constant percent. Curious to know what that number is. At the very least, it will be a good starting point.

https://github.com/RomRaider/RomRaider/issues/66
Next RR release should fix this problem up.

This makes me really anxious to install my Dinan supercharger kit. I got the whole harness and DME from an original Dinan car (I can post the .bin if allowed/requested) and it has some kind of magic resistor box inline with the wiring for the stock MAF in draw through configuration. I believe it's only tuned for ~6psi, so I'm really curious to see how close Dinan's tune is to the stock MAF's "limit". The "load" only goes to 700, and the ignition timing maps a lot closer to a stock s52 than I thought they would be. I figured maybe with the heatsoak issues the non intercooled cars had, that there would be increased IAT based ignition retard, but there is not.

I guess I'll have to wait and log with stock pulleys to find out more.