RomRaider

I didn't have any trouble cutting and pasting into RomRaider.

I'll check it out tonight.

When your in RomRaider and copy just the the volts, or just the "Airflow g/s" you get [Selection1D].

Example:

[Selection1D]
1.30 1.49 1.70 1.93 2.18 2.45 2.76

Thanks,

John

It seems like it shouldn't matter what's in the Previous Table section.

I've been logging to test out a MAF table, but I have not pasted my table in. Since it's a percentage, it seems like I I need to do is alter MY MAF Table by the percentage regardless of the Previous Table's values in the sheet.


I'll try it both ways, and see if if makes a diff.

mickeyd thanks for all the work...

i've attached my 02 wrx stocker prodrive cai results...

i updated my stock rom from AF423 to AF426 a day before this log data so i'd imagine i'm still learning (i will relog after a few more days)

(shout out to opensource community for making this all happen - big deal to me just being able to flash a newer revision rom to my baby!! i know many of you are laughing at this!!)

couple comments - your stock maf table is different then mine in both the top end (my maf table stops at 4.65) and the values - i'm guessing the 05 lgt vs. 02 wrx differences but you might want to indicate what stock maf table your referring too in the spreadsheet..

thanks again
dm

I just double checked. It works either way.

It doesn't matter what car the rom is based on, you need to make sure that rows 6 and 7 represent the table from the rom that the datalogs are based on. Every intake is different. In principle, this is just like Airboy's spreadsheet.

You will find that you may need to do this twice. The second time that you datalog after flashing, you will need to update rows 6 and 7.

If you move the cursor over cell A4, a comment will appear indicating that the MAF table must be based on the rom that you are datalogging.

There are comments in cells A9, A12, A16 and A20 as well.

Don't forget that if you change your low range MAF table, you MUST change your high range with a WBO2 sensor. They must be a matched set. You do not want to turn off AFR learning if the high range was relyng upon it.

I missed the comments in the spreadsheet. The comments cover what I was looking for in my previous post.

thanks again

dm

This is a great tool Mickey. It saved me a ton of time. It works very well with sufficient data for all of the closed loop, and I'm going to work with it for OL as well. Thank you again.

I found that holding the throttle steady was great for getting data. I just drove at a variety of speeds and in all gears, I'd go for 50% throttle or less usually, but I'd try to hit about every 5% interval of throttle up to that point.

At least here in Seattle, lunch would be better than commute time. The more empty the road the better.

How do you plan to use this for OL?

I don't think it can. You need a WBO2. This tool is primarily to minimize the AFR learning oscillations and to smooth out the closed loop driving behavior.

I have been toying with the idea of using MRP to scale the MAF in open loop. Take a look at this thread:

http://www.romraider.com/forum/viewtopic.php? ... hlight=mrp

Right now, I have been using this method to check the accuracy of the MAF scale but not actually scale it. The risk with this method is that it assumes a relatively constant volumetric efficiency. At RPM less than 5000, the boxer engine is fairly constant. However, at 6000 rpm and above, the volumetric efficiency really starts to fall.

So, for turbos that have a max flow at about 5500 rpm (most subaru stock turbos such as VF40), this isn't really a problem.

I see your point, OL gives no AFR correction feedback.

I'll use a wide band and the AFR differential of AFRwb/AFRfueltable to scale the far reaches of the MAF table above 2.9V.

MRP would work for the turbo being used, but it would change with the compressor efficiency of the turbo and the boost pressure being run. You'd need a boost temp correction factor to get any sort of accuracy.

I don't think it works that way. The MAF (and corresponding load) is measured at the intake tube (pre-turbo). Take a look at the plots in ride5000's thread. On a well adjusted MAF table, the scatter is very tight.

The turbine housing does affect the volumetric efficiency but it won't be earth shattering below 5000 rpm. The volumetric efficiency is in the mid 80 percentile. It only affects it alot if the turbine housing was choking off the flow.

Dood, your excel file works like a freakin charm !!

Nice Job.

Question... Can I plug in data from my LC-1?

For the open loop stuff, you need to use Airboy's spreadsheet since you have to use the AFR interpolation in order to determine the target AFR.

Select the LC-1 output as the AFR.

Man, I wish I was better in excel.

Thanks !!