HOW TO: modify OFT tunes for Socal 91 oct. VIDEO TUTORIAL ADDED
 

This is a tutorial on how I personally keep my IAM at 1 on the Stage 2 tune running crappy Socal 91 oct. fuel, with the JDL UEL Header. No guarantees the timing changes will work for you, and do these edits at your own risk.

UPDATE: I AM NOW RUNNING WAYNO'S BASE TIMING B AND MY OWN MODIFIED IAT COMPENSATION TABLE.
If you're going to use Wayno's timing values, you can use Wayno's XML definitions and copy the Base Timing B table from his tune to yours, or just make the changes to your ROM manually.
You can download Wayno's XML definitions and BIN tune files here:

http://www.ft86club.com/forums/showthread.php?t=83945




Okay, I've added a video tutorial here on how to use RomRaider to edit maps correctly, and use Openflash Manager to upload them into your OFT. This briefly touches on datalogging and timing changes, but is not really the purpose of the video. The timing changes in the video are hypothetical. Refer below and refer to Steve99's datalogging tutorials for more info on that.
(Disclaimer: Once again I assume no responsibility for changes you make to your own car and the effects they may have.
Sorry if I put you to sleep, this is my first ever video tutorial so please be kind. :thanks:

[ame="https://www.youtube.com/watch?v=hvmVOxI3GPs"]OFT & RomRaider Tutorial - YouTube[/ame]



This written tutorial requires knowing how to modify tables using Romraider. If you don't know, see video above, @steve99 's tips, Romraider website, etc. and read up to learn how.

Important tips so you don't brick your ECU: In the Romraider ECU Definition Manager, ONLY use XML definitions downloaded from the Openflash website, or from Wayno's links. Be sure to use the XML definitions corresponding to your Tune Version/ECU Calibration.
For example: v2.06/OFT_ZA1J_B01C.xml
Do not use version 1.5 xml definitions with 2.0 tune files.

Open your corresponding BIN file, (Stage 2 91 Oct, UEL B01C in my case)

Here are the BASE TIMING B and Timing Compensation (IAT) changes I've made.
After making changes I like to save my changes as a new file, and then open the original to compare what I have, which is what you see here:

PLEASE NOTE THIS IS THE AMOUNT OF TIMING PULLED COMPARED TO THE ORIGINAL STAGE 2 OFT MAP TIMING, NOT THE ACTUAL TIMING VALUES.

Attachment 123994

(notice I've changed my rev limit to 7500, which requires modifying this table and the Rev Limit table, you don't need to do this)

I recommend running Wayno's smoothed Base Timing B, then datalogging your own car to find where you may need to pull more timing, as all cars, headers, and fuels are different. Read @steve99 's tutorials on datalogging in order to do this correctly.

After you've made changes, save your BIN file, close Romraider. Reopen Romraider, open your modified BIN file and make sure everything looks normal. You're now ready to connect your OFT, open Openflash Manager, and upload the file to your OFT.

Although you're losing some minor timing doing these changes, it will be more knock-free and safer, and keep the ECU from making large timing corrections resulting in large amounts of timing pulled.

Please let me know if I've missed anything, or any questions and I'll answer as best as I can. Enjoy!

PLEASE excuse my ignorance (literally just started reading on editing OFT Maps couple hours ago), but is the intention of this edit or modification, to help prevent knock from our crappy 91 octane gas?

Yes :-)

If you flatten the KCA table and adjust the Base Timing table by equal amounts, you can better see where to actually remove timing and you'll end up with a smoother map with timing not removed from unneeded areas.

What you do is look at the flattened map, then remove timing from that one and your normal map in parallel.

I'll attach roms with KCA already flat.

The ones labelled 100 are the US 91 AKI maps.

98 is for our 98RON fuel, worse than US 91.
There's one with the flat KCA of 6 deg with timing pulled, and another with normal KCA with the exact same timing pulled.

I haven't had a chance to test it, I just went back over my old petrol logs and redid my maps.

I first did what you did - blanket pulled timing from the general area, instead of addressing the lumps in the timing that caused knock.

This will definitely require more timing pulled, but using my process the end result is much better power delivery.

<removed old attachments>
Look at the guide I posted instead for latest files.

http://www.ft86club.com/forums/attac...1&d=1442115672

OMG can you help me do it on mine please? haha :D

Were you able to figure this out? How can I help?

Is this even worthwhile to do on a Stage 1 tune?

Yes as if the ECU uses coarse correction ie reduces IAM to less than 1 in order to reduce knock it effectivly reduces ignition timing (hence power) over the entire rpm range even though the problem area may only be in a small rpm band in low rpm area.

the ECU is also quite agressive in removing timing and will often remove double what is needed to supress knock.

You can get a better result, smoother running and more power by tailoring the ignition advance to your fuel rarther than letting the ecu do it.

http://datazap.me/u/headlikeahole/lo...ta=1-5-8-12-13

I seem to have plenty of knock and I'm on stage 1 tune, so if you're able to correct it then you should. Unfortunately I don't really know what I'm doing...:(

Damn... I was going to pick up an OFT but now I'm not too sure. Really do not want to knock haha. Other then the links on steve's signature is there other links you guys could send my way. Also how difficult is this to do? Also for stage 1 91 tune, do I make the same changes?

To put it in perspective the stock tune knock way worse than what is above.

the knock is quite minor.

The changes to tune are quite easy with romraider, just takes a bit of time to learn how to do it.

below is a log of the STOCK tune note the IAM=0.2 and still 3 degrees of knock correction

http://datazap.me/u/steve99/south-af...ata=2-20-27-28

If you made the same changes to stage 1 tune would be fine

Even without modifications the OFT tunes are much less knock prone than the stock tune. Not to mention way smoother and more powerful. It's actually quite simple once you do an appropriate datalog.

I'm actually thinking of doing a video tutorial pretty soon because so many people are new to this whole tuning thing and need a point

Why would the corporations let the stock tune be set with that much knock? Who can't tune at toyota or subaru?

It probably done on best fuel available then they just rely on the knock control to compensate for lower quality fuels or fuels in different countries.

The timing/fueling tables in the stock rom are same for USA roms ie they have access to rearly good 93 AKI fuel and you IAM will be 1 with little or no knock, same tuning used for South Africa which only has 95 ron fuel available which is way worse than USA 91. IAM =0.2 and still -3 degrees knock corrections.

Our rubbish 98 ron in Australia is not even equlivant to your 91 and same tables used.

Probably just too expensive to tune for all the different fuels.

I see cars on stock tune here running 98 ron fuel with IAM at 0.5 and lower. and still 2 to 3 degrees corrections at times.

top quality 93 octane fuel tuned to the ragged edge=most power=better marketing=more sales

A tutorial would be great!

@headlikeahole
@HachiEnam
@JS + BRZ

Added video to OP, hope this helps you guys get going with editing maps.

Does it matter that romraider gives me all kinds of checksum alerts when I open or save a tune file? I'm sure I'm using the right xml and bin files.


edit: Tried to add the updated tune to OFmanager and im not getting "checksum has been corrected" not sure where I went wrong.

edit 2: Think I found the answer on one of the other OFT threads.

So as long as either romraider OR manager fixed the checksum then im good?

@headlikeahole like I said in the video, you'll get checksum alerts and romraider will correct it when you save your file, or OFM will correct it for you.

Watched the tutorial after posting thanks! Video tutorial was great for confirming the work I did yesterday. Uploaded my new Tune this morning no issue. Didn't pull quite as much timing as you, going to do some logging and pull more later if needed.

Thanks again for the great write up.

I took a look at these timing changes from your log and compared to the changes made on my personal Stg1 file and they are almost identical, @JB86'd do you happen to use Chevron exclusively? I only ask because these changes are pretty much what I had to do to keep my IAM from dropping in traffic or normal driving, anyways great work! I would highly suggest trying these values if you are having issues with CA 91 I imagine if you use Chevron only then these will do the trick for you.

@JB86'd

Would it be possible for you to do some custom tuning for my friend with OFT? He just installed BPB on his car but his car is 2015 BRZ so there's no map available for it yet..

I did use Chevron then I switched to Shell. I'm sure they're pretty similar as far as quality.

I don't really do any "tuning", I'm really not qualified, I just make small changes and dabble in modifying small stuff.

If I'm not mistaken, if your friend can open one of the BPB tunes from another year BRZ in Romraider, then open his tune..he can see what differences are there and copy them over. Just needs to be sure to use the correct Openflash definitions when opening those tunes.

Are you not getting any knock between 2400~4000RPM .6~.8 g/rev areas with only -.35 degrees less than the OTS table?

@solidONE Check out the temp compensation table

Ahh okay.

This is my Base Timing and compensation tables for STG1 CA91 vs STG1 OFT93 for your reference.

http://i174.photobucket.com/albums/w...%209-26-15.jpg

First post updated, now running Wayno's smoothed Base Timing B and custom IAT Compensation

Nice! Can you post a screenshot? Is this with Wayno's helpful tip of a flat KC Advance table with corresponding changes on timing?

The screenshot is updated in the original post. Yeah, I just copied Wayno's Base Timing B over to my tune, no need to mess with the KC advance table afaik.

The released tunes don't have flat KCA, only the files used for 3d mapping the timing does.

So I should not run a flat KCA table for daily usage?

Their is no real advantage in doing so unless you want to see knock easily using the KCS value. ie if its flat any deviation is knock. But be have FBKC and FLKC parameters to see knock much easier.

although that KCA table looks like a random array of numbers I suspect the subaru engineers designed it that way to allow more knock correction to take place in knock prone areas when IAM drops. and/or drop the timing larger amount in certain areas as IAM correction acts on KCA values only.

This is very true. You don't really want the IAM to reduce timing at lower load, just let FBKC take care of that. If you want a flatter advance table so that the base timing is easier to read then I would suggest keeping the values in each load column the same and increase them as the load increases. Mine goes from 0 to 5/6 degrees, use the stock table as a guide ;)

You can use my timing adjust tool to play around.

You guys are some of the most helpful mofo's on here that's not trying to sell something. lol High fives all around!

@steve99 Are you saying the Stock cal is more knock limited that the Stage1 cal running the same fuel? I find it difficult to believe because both cals have similar spark timing until close to WOT or 95% VE and Stage 1 cal has less Exhaust phasing by about 25deg at places although Stage 1 cal uses a tad more intake phasing at the same places overall it should make the engine knock a bit more than stock

Usually when the cam overlap is dialed out the flame speed increases making it knock earlier for same spark timing

If your talking about post above, then all the guys are doing is shifting timing from base a\b to the knock correction max A table, same overall timing. some tune is same just kca (knock coorection max a) table flattened so you could more easily see knock. Same tune no other changes.