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

[JB86'd]

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.

[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.



(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!

[akahenry]

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?

[steve99]

Originally Posted by akahenry

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 :-)

[Wayno]

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.

[JS + BRZ]

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

[JB86'd]

Originally Posted by JS + BRZ

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

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

[nocturne1]

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

[steve99]

Originally Posted by nocturne1

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.

[headlikeahole]

Originally Posted by nocturne1

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

Originally Posted by steve99

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...

[HachiEnam]

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?

[steve99]

Originally Posted by HachiEnam

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

[steve99]

Originally Posted by HachiEnam

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?

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

[JB86'd]

Originally Posted by HachiEnam

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?

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

[themajesticone]

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