How To: Closed Loop MAF Scaling

ukwrx · **Joined:** Mon Sep 19, 2011 4:39 pm **Posts:** 87

my0six wrote:

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

I'm getting up to -12% on the stock intake and map on my 06 wrx in the a/b columns 4-6 in c/d. When I had an emissions check the lambda was read at 1.015 which is a fraction lean but within range, implying that the removal of fuel shown by the negative fuel trim is a little incorrect.

Spent hours trying to find the cause. New air filter, checke for Boost/vacuum leaks, clean maf sensor etc. Had fuel pressure/regulator checked. but still get high values. So I kind of consider it normal now. Only thing left to try is new plugs, before I resort to changing the maf scale or ignore it.

my0six · **Joined:** Wed Jan 02, 2013 7:09 pm **Posts:** 15

Cheers bud, that makes me feel a bit better. I still intend to look at it later, but I've just had surgery and won't be able to drive for a while, so I'm spending my time reading tuning books to get up to scratch with it all.
I'll be back when I have some new figures and a better understanding!

mrf582 · **Posted:** Wed Mar 06, 2013 1:14 pm

pete25r wrote:

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.

Does this keep all the data in one logfile? If so, this is incredibly useful! Thanks!

dschultz · **Posted:** Wed Mar 06, 2013 11:54 pm

mrf582 wrote:

pete25r wrote:

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.

Does this keep all the data in one logfile? If so, this is incredibly useful! Thanks!

No, a new file is generated. It's no different than using the mouse button to click the "Log to file" button.
If you click somewhere else on the screen and take the focus away from the "Log to file" button, the space-bar action will no longer activate the button.

If you wish to pause logging to a single file then you can just press the Disconnect button while the "Log to file" button is active. Of course that also stops the displaying of data on the screen. When you press the Reconnect button the data will once again be written to the same log file.

mrf582 · **Posted:** Sat Mar 23, 2013 12:20 pm

Thanks. That is a nice workaround. It will come in handy when taking log files to calibrate the MAF, VE map etc where you don't want any transient throttle effects. So one could do a run from low MAF g/s, pause the logger, and do more runs to get more datapoints. Same with calibrating the VE map. Do runs from various different throttle angles etc.

ibr_adam09 · **Joined:** Mon May 13, 2013 11:42 pm **Posts:** 10

Sooo, I just did this because I have -15.00 across the board and I'm already 'tuned' (see thread here herehttp://www.romraider.com/forum/viewtopic.php?f=15&t=9595) and now I have a few questions.

When I went recording, I was all highway for 30 minutes, then drove around the city in 30 minutes, and finally made rounds around a parking lot at 5mph for 15 minutes with idle. I did this all in one shot without stopping the record button.

-^Was that ok ? ( I did pause on dramatic throttle responses)

-When I updated the maf sensor, I didn't make any breaks, but instead small increments like 1.10-1.20 update, 1.20-1.30 update, etc. I already had a "nice line" with the exception of the low and high ends.

-Does maf scaling in cl affect any other part of the tune? I'd think not since these values (.9 to 3.0) are all under idle and cruise.

End result looks promising and hell of a lot better than past learning views. (I have logs attached) but we shall see ?

If I'm headed in the right path, then Ill continue for better accuracy.

DVeal · **Joined:** Fri Apr 12, 2013 8:27 pm **Posts:** 24

Strange question....but has anyone ever tried to use romraider tools on a COBB AP car?

dschultz · **Posted:** Wed Jul 10, 2013 2:36 pm

Most everything related to logging works for their MAF versions. I believe people have reported some parameters not working for their SD version.

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

Been looking at this guide for BMW MS41 MAF scaling.
The MAF tab in the logger doesn't seem to record the yellow dots like described in this how-to.

dschultz any ideas?

dschultz · **Posted:** Sat Oct 22, 2016 12:18 pm

It doesn't work for BMW as the parameters needed are not support by the DME.
You'll have to Log and work it out manually or try a different tool.
Maybe this could work but I've never tried it.
viewtopic.php?t=10481

Injen · **Joined:** Fri Apr 07, 2017 11:00 am **Posts:** 25

I'm new to tactrix so it's nice to see some guides that are easy to follow

I have some trouble with my A/F learning (-1.70, -14.40, -13.10, -15.00)

When you say
RECORD AT LEAST 30 minutes of highway/freeway driving
RECORD AT LEAST 30 minutes of general driving
RECORD AT LEAST 15 minutes of slow speed driving
RECORD AT LEAST 5 minutes while you idle
Should i apply the correction for each step individually or eveything in a big sweep?

welaish · **Joined:** Tue Apr 29, 2014 12:48 am **Posts:** 946

Injen wrote:

I'm new to tactrix so it's nice to see some guides that are easy to follow

I have some trouble with my A/F learning (-1.70, -14.40, -13.10, -15.00)

When you say
RECORD AT LEAST 30 minutes of highway/freeway driving
RECORD AT LEAST 30 minutes of general driving
RECORD AT LEAST 15 minutes of slow speed driving
RECORD AT LEAST 5 minutes while you idle
Should i apply the correction for each step individually or eveything in a big sweep?

Each region will have a voltage range. so you can do them in a big sweep. use VGI tool it will reduce the effort.

bludgod · **Posted:** Tue Jun 06, 2017 9:00 am

Injen wrote:

I'm new to tactrix so it's nice to see some guides that are easy to follow

I have some trouble with my A/F learning (-1.70, -14.40, -13.10, -15.00)

When you say
RECORD AT LEAST 30 minutes of highway/freeway driving
RECORD AT LEAST 30 minutes of general driving
RECORD AT LEAST 15 minutes of slow speed driving
RECORD AT LEAST 5 minutes while you idle
Should i apply the correction for each step individually or eveything in a big sweep?

ideally you want to log a lot of data and make small changes to your map from that, then rinse and repeat until your corrections are close enough.

Injen · **Joined:** Fri Apr 07, 2017 11:00 am **Posts:** 25

welaish wrote:

Each region will have a voltage range. so you can do them in a big sweep. use VGI tool it will reduce the effort.

bludgod wrote:

ideally you want to log a lot of data and make small changes to your map from that, then rinse and repeat until your corrections are close enough.

Thanks guys. I will give it try later but first i have to read some more guides and "how to" before i even start.

jon7009 · **Posted:** Tue Jun 06, 2017 1:06 pm

Injen wrote:

Thanks guys. I will give it try later but first i have to read some more guides and "how to" before i even start.

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How To: Closed Loop MAF Scaling

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