RomRaider

Possibly Ben, but you won't know for sure until you log it.

Also, it isn't very linear for some reason, so while it might be -12% out in OL, it could be much higher or lower in CL.

Keep working through your CL MAF, and when you have it within +/- 2%, work on OL using the OL MAF Tool spreadsheet and a lot of patience

when doing closed loop scaling can i shift? or will it mess up the process?

The goal is to try and reduce skewed results introduced from other tables in the ROM, so if you can try and record large amounts of data without gear changes, that would be best.

However, if limited, the spreadsheet will generally remove a bit of the pre/post gear change data so you'll be fine - it might take a few extra/longer logs to get it all dialed in though

You can log throttle angle as well as IAT, and then calculate the throttle angle change and graph it out and see where most of your data lies. Sort it and delete all the high throttle change and high IAT data then use what is left for scaling more accurately.

I am new to tuning and wanted to post a picture of my maf scaling from romraider and see if it looks like a good place to start with the updates. Please let me know if this is in the wrong place. Thanks in advance.

Car: MY05 Impreza OBS 4EAT
Mods: Full Exhaust, Hybrid air-intake
ECU: E2ZJ101G ID:

Here are the values that were logged:




Here is the trendline:

Just thought I'd post up my early results and a thanks for this guide, here was one of many "before" snapshots. After hitting "Update MAF Scaling" button in RR, I found that no matter what I did my rom would not save with the new values. Possibly something I'm doing wrong, but I copied the table to excel along with my "trunk" table (to make sure the values were different) and updated my rom manually in ECUflash. I've just downloaded several of the different CL spreadsheets for next time - the "after" screenshot is only after about 10 minutes of driving so I'll leave this tune in for another few days before going through my next iteration. Will probably also change my airflow ranges too as I now understand the difficulty of getting reliable data from between 5 and 10 g/sec.

Before



After

I noticed that with the beta version of Romraider the maf changes would not save as well.

I ended up using a combination of logging and some of the closed maf scaling worksheets on this site.

What's your user level set to, is it high enough?
I believe for it to work you need to have opened your ROM in the editor first. The Logger looks to the Editor to locate the ROM to apply the changes to.

User level was set to the highest.

I discovered that issue with opening the ROM first with the earlier versions of Romraider.
Saving should have worked with the newest beta but did not. No error message was displayed.

in tuning the MAF, I have a nice long empty stretch of road to and from work, but it is pretty level the whole way. Would using the brakes (while holding on the throttle) to simulate an incline be an acceptable way to tune the higher load areas? With the fast polling option i shouldn't have to abuse the brake pads toooooo much, i'm thinking....

I'm gonna do my first MAF scaling and there's a highway where i can record a good 30-45mins of data. do i also record 5-10 mins of idling on top of the recorded highway driving data? or should i record idling separately? meaning that i would need to update my maf with the highway driving data, reset data and then only record idling?

thanks!

I was using the Rom Raider method the other day to scale my MAF and found something useful as far as the pausing of logging.

So you need to pause the log when you slow down for the idiot that just pulled out in front of you? Spacebar.

I was logging, set up while parked, clicked the record button, hit spacebar to pause then off I went. Whenever I wanted to pause logging I tapped the spacebar. Tap it again and you're logging. Makes it easier so you don't have to have a copilot or move the mouse around and click the button. I had to keep waking up my screen every so often by moving the mouse so it was never where I left it.

Okay, sorry to be a massive pain here guys, but I am seriously lost and would appreciate a gentle shove in the right direction.

I've done logs with Learning view (as directed in other posts on these forums) as my first step into tuning.
I've got some AF#1 numbers that are OVER 5% and I keep reading this

"You’ll generally start by logging to make sure that (or find out if) your car is healthy. First, just do some mild driving, and use Learning View to make sure that your fuel trims are all in the range of −5% to +5%. If they are not, stop here and work on your MAF scaling."

I have a completely stock MY06 WRX (ADM, I'm aussie), so can somebody explain to me the apparent contradiction of the above post, where you say "There is no other reason to touch the MAF scaling, so if you have not touched your intake, MAF housing, or anything else that effect the them, DO NOT touch the MAF scaling table."....?

It's my understanding that the MAF scaling just tells the ECU how to interpret what the MAF sensor is saying... So I don't see any reason why I would want to mess with the scaling, that would be like moving the numbers on a thermometer...

Sorry again if this is the wrong place to put this, but I've been reading for weeks now!!!

Follow fastblueufo's advice in the other thread - if you haven't changed your intake / MAF housing - don't mess with it.

Okay, I guessed I'd get that reply. I'm gonna have a look at my hoses, clamps and air filter.

Is it considered normal to have a -5.9% on a stock car with a stock tune?

Thanks for the reply td-d