Simplify the process of dialling in your 86/BRZ

• Download the appropriate roms for your car here
• Flash using Openflash Tablet or Tactrix Openport 2.0
• Drive 200 miles or 300 km
• Using your device, log 2x 3rd gear pulls
• Upload your log to Datazap
• Compare your AFR at WOT to the applicable target here
• Re-flash the appropriate file containing an alternate WOT fuel curve

• (optional) Drive an additional 200 miles / 300 km, log again to confirmed fuel has improved.
• (optional) Log for knock and adjust timing if required. Alternate timing maps are provided in some cases. Timing maps have already been smoothed out to reduce problem areas.

Disclaimer

These files are intended to be used as a reference for tuning your own car, but if required can be used without any modification. In reality they are likely the most refined off the shelf maps in existince for black manifold cars, and still much improved over openflash for red manifold cars.

With that said I take no responsibility for any damage directly or indirectly resulting from use of any files supplied on this site, or any damage resulting from error during flashing or damage resulting from my mistakes during file creation. The end user takes full responsibility.

Supported Cars

What make/model are supported?

The Toyota 86 and Subaru BRZ, aka FRS, FT86, GT86

What model years are supported?

All Zenki (MY12-MY16) model years are supported, before the dash/intake/exhaust/differential/wheel/ECU refresh.

Kouki (MY17+) 6AT and EU 6MT models with black intake manifold (K00G, K01I, K00S, K00D) have the old ECU logic and tune, but must use the new ROM to match the updated security system and dash.

Kouki (MY17+) AU and US 6MT models with red intake manifold (K00P and K00C) have completely new ECU logic. These tunes are currently less specific than the previous generation.

Any extra cost for MY17 roms is due to the days required to discover and define the tables.

I have an aftermarket intake, which file should I use?

Aftermarket intakes almost always require custom tuning, regardless of any bullshit stock tune marketing dyno graphs from the manufacturer. Your goal with an intake is simply to attempt to restore power to stock intake levels.

Grimmspeed - flash "Default" MAF Scale first.

Perrin - start with "Lean-2%", and multiple 3.4V and above by 0.96.

Skunk2 with MAF insert - start with Rich+4%, and add an additional 7% to the entire scale. Skunk2 and others all require vastly different MAF Scales, which are usually as smooth as dogs vomit if you attempt DIY. Do not even bother attempting to keep fuel trimming enabled at WOT without the MAF insert the intake comes with.

Using the Site

What files are supplied after purchasing?

• Existing rom files listed on the order page when all fields have been filled.
• Definition files for editing in RomRaider.
• Tactrix logger definition file for your target calibration.
• A tool for analysing the internal calibration codes of files.
• Stock roms for your market.
• readme.txt

Where can I download ROM files?

On the "My Roms" page. Downloads are disabled until payment is confirmed.

Where can I download RomRaider definitions?

On the "Support" page. Downloads are disabled until payment is confirmed.

Note: Although I've never heard any reports of bricked ecu's from these cal-hacked roms or OFT cal-hacked roms, users of this site take full responsibility for any negative outcomes resulting from using the files supplied here.

FAQ - General

How long have these files taken to develop?

See the history section. I learned from scratch using OFT on my own car. Unfortunately openflash make some changes to the stock rom for the US market which limit the ecu learning process, which likely added 6 months itself.

After that 2 years and seeing data for my files running on over 50 cars, I decided it was time to do something about the fuel trim learning being so unpredictable and started developing the changes to enable other people to optimise their tunes in one or two flashes, instead of spending a year themselves learning how.

How much time can I save by using these files?

A small number of people in the US may use the openflash roms that come with their OFT and may get lucky.

For everyone else using an openflash file as a base, it may take 6 months to a year of constant logging, testing and going in circles.

Why is it so much quicker using this method?

You will only need to change the fuel at WOT (wide open throttle), which is around 5 values in one table. Most of the files containing these changes are already supplied.

This is enabled by some changes which have been made to the direct and port fuelling that makes fuel trim learning much more predictable.

Are these tunes locked for editing?

No, you can open, edit and save these file in RomRaider. Definitions supplied.

I ask that you please do not distribute them in any way.

Will these tunes lock my ECU?

These files will not prevent your ECU from being re-flashed like ECUTEK, BRZEdit, etc.

What car do you own?

I have an AUDM 6AT MY14 Toyota 86 with ACE 250 header, Moto East flex fuel kit, OFT and Tactrix running A01I rom with flex fuel logic developed by ztan for A01G, and ported to A01I by myself. Porting from 6MT to 6AT took one month.

Devices

Which one should I buy?

Both perform the same basic functions.

OFT has some restrictions, particularly for non-US markets.
• Both real time display and logging are locked to imperial units.
• Logging is locked to a set rate of 10 samples per second.
• The touch screen is particularly fragile, which if dropped turns it into a paperweight. There's an increased risk of dropping due to having to transfer it from car to PC to load files and copy logs. And the replacement cost is high and slow (up to 6 months). These three factors combined make it not a very good investment for non-US markets.

Can I use OFT for the real time display, but flash with Tactrix?

Yes, provided the files being flashed have the same (hacked) calibration code as what the OFT is married to.

Can I use the OFT real time display while logging with Tactrix?

No, only one device at a time can have exclusive access due to the way they interact with the CAN.

Can I use a cheap USB/BT dongle for real time display while logging with Tactrix?

No, as above. Being able to display and log simultaneously is the obvious advantage for OFT.

Tactrix - Howto

Logging

Download and copy the logger definition for your ROM to a Micro SD card. Note: MY17 may have limited or nil known addresses.

Flashing

• Download and install Ecuflash.
• Download and add Ecuflash write definition files to "C:\Program Files (x86)\OpenECU\EcuFlash\rommetadata\subaru\BRZ"
• Open Ecuflash, select "ECU" > "Select Vehicle Type" > "subarubrz".
• You may now "Read calibration and code area using OEM method".
• Note the CALID in the log window.
• When saving, use "Raw ROM file (*.bin)".
• Open your new ROM and "Write calibration and code area using OEM method".
• Always select YES to correct checksums when using Tactrix.

Further Info

Link

Openflash Tablet - Howto

• Plug the OFT into the vehicle.
• Turn the vehicle ON (not start, not acc).
• Select BRZ vehicle type.
• Select "Tuning" > "ECU Info". Note "Calibration Code". support.openflashtablet.com
• Select "Tuning" > "Read".
• Follow the instructions on the OFT.
• The OFT is now married to the car.
• Take note of your stock calibration code in the info screen.
• Turn the vehicle off.
• Plug the OFT into a PC.
• Load Openflash Manager.
• Confirm stock calibration code... video
• Remove all generated tunes if present. Other files may not load correctly if this is not done.
• Unzip new files.
• Upload new files. OFM restricts you to uploading ROMs that match your stock calibration code, or that have been hacked to appear to have the same calibration code as stock.
• Plug the OFT into the vehicle.
• Turn the vehicle ON (not start, not acc).
• Ensure the lights are off and door remains open.
• Select "Tuning" > "Write".
• Follow the instructions on the OFT.
• Start vehicle and idle for 1 minute without touching accel pedal.

Never plug OFT in while car is ON.

This will interrupt the CAN and throw a DTC, and all learned ECU data will be wiped.

Never leave OFT plugged in while the car is OFF.

The tablet can flatten a new battery within 3 days. After your battery has been drained this way, it will never maintain charge the same way again.

Videos

• OFT Installation
• Openflash Manager
• OFM Stock Calibration Code
• Logging

Further info

• ft86club.com
• support.openflashtablet.com
• support.openflashtablet.com

Logging

What are the minimum parameters do I need to log for petrol and E85 tunes?

• Engine Speed (rpm)
• Throttle (percent)
• MAF Voltage (volts)
• Engine Load (g/rev)
• Ignition Advance / Total Timing (degrees)
• AFR
• Commanded AFR
• STFT (percent)
• LTFT (percent)
• Oil Temp (F)
• CL/OL / Fuel Sys Status (2 = CL, 4 = OL)
• IAT / Intake Air Temp (F)
• IAM / Ignition Advance Multiplier
• FLKC / Fine Learning Knock Correction (degrees)

What are the minimum parameters do I need to log for FLEX FUEL tunes?

• Engine Speed (rpm)
• Throttle (percent)
• MAF Voltage (volts)
• Engine Load (g/rev)
• Ethanol (percent)
• AFR
• Commanded AFR
• STFT (percent)
• LTFT (percent)
• Oil Temp (F)
• CL/OL / Fuel Sys Status (2 = CL, 4 = OL)
• IAT / Intake Air Temp (F)
• IAM / Ignition Advance Multiplier
• FLKC / Fine Learning Knock Correction (degrees)

What can I log to help determine ECA scaling?

• EVAP Voltage (0-5V)

AFR Adjustment

What AFR (air:fuel ratio) should I be targeting?

• Around 11.5-11.7 AFR between 6000-6800 rpm for petrol using Tactrix.
• Around 11.7-11.9 AFR between 6000-6800 rpm for petrol using OFT.
• Around 11.9-12.1 AFR between 6000-6800 rpm for E85 using Tactrix.
• Around 12.1-12.3 AFR between 6000-6800 rpm for E85 using OFT.

MAF Scales

Which MAF Scale variation should I try after 300 km / 200 mi on "Default"?

Trends

These are by no means hard and fast rules, the only way to be sure is to log, which is why this appears after the previous table.

AFR Examples

Using Tactrix and E85, what's an okay AFR curve look like?

Using Tactrix and E85, what's a slightly lean AFR curve look like?

(An older version, notice the change in di:pi @ 5k rpm ratio causes the LTFT to jump.)

Using Tactrix and petrol, what's an okay AFR curve look like?

Using OFT and petrol, what's an okay AFR curve look like?

Using OFT and petrol, what's a slightly lean AFR curve look like?

(The large bumps are specific to the type/brand/design of headers, combined with valve timing in that area.)

Using OFT and E85, what's a slightly rich AFR curve look like?

Fuel Types

Alternate injector ratio versions

Examples where 100% DI may be beneficial due to the top LTFT bracket for port injection refuses to learn correctly.

Alternatively, for a race car on stable fuel, keep using 20% PI, disable LTFT at WOT and scale the MAF manually for WOT.

Header Codes

What are the differences between tunes?

Stock Calibration Code History

FAQ - Calibration Codes

Why should I never flash native MY12-MY13 roms?

See "Stock Rom History" above.

Why are MY12-MY13 roms really MY14 roms hacked to appear like MY12-M13?

This is due to OFT requiring the same calibration code as it originally reads from the ECU, and MY14 including critical fixes over earlier roms.

Why are MY15-MY16 roms really MY14 roms hacked to appear like MY15-MY16?

Discovering logging addresses is time consuming. When Openflash started delivering native MY15 and MY16 to customers, they didn't include the correct logging addresses for those roms and so those customers couldn't log some key addresses. However, they could correctly log addresses for hacked MY14 roms.

Why can't I flash MY16 roms to my MY12-MY14 car?

Why aren't all MY12-MY15 roms really MY16 roms hacked to appear like MY12-MY14?

MY15-MY16 cars include hardware changes that make the roms incompatible with MY12-MY14 cars.

Which calibration code should I choose for OFT?

Choose the calibration code that exactly matches your stock rom read by the tablet.

Which calibration code should I choose for Tactrix if I have MY12-MY14?

Choose the native MY14 rom.

Which calibration code should I choose for Tactrix if I have MY15-MY16?

You can flash either the native MY14 rom, OR the same rom hacked to appear as your native calibration code.

Which roms are FLEX FUEL tunes based on?

• All 6MT including USDM are based on A01G (AUDM 6MT MY14).
• All 6AT including USDM are based on A01I (AUDM 6AT MY14).

History

My Files History

Openflash Release History

FLEX FUEL History

Tuning changes compared to stock/openflash

Air/fuel

Ignition Timing

Valve Timing

Utility

RomRaider Config

RomRaider is used for editing. It is not required for flashing.

Definition prefixes

Add definition files using the definition manager.

Defintions are prioritised from first to last.

Set Debug Level

Compare ROMS

Selecting any table in the list will compare the table from the first rom to that of the second.

Example - OTS Stg1 total timing compared to stock MY12-16 total timing:

FAQ - Adjusting Fuel

What AFR (air:fuel ratio) should I be targeting?

See AFR Adjustment.

Which MAF Scale do I flash?

When flashing one of these roms for the first time, always choose file labelled "Default" for the given header/fuel.

What do I do after flashing?

• Drive normally for 200 mi / 300 km, then begin logging and log 2x WOT (wide open throttle) pulls (foot flat to the floor), in third gear, from 2500 to 7500 rpm.
• Then upload the log to Datazap to analyse.
• You may need to re-flash a leaner or richer file to get the AFR in the best zone.

What is the difference between the petrol tunes (89AKI, 91AKI, 93AKI, 98RON, 100RON, 102RON)?

• The primary difference is the amount of extra timing added from mid to full load.
• They may also differ in MAF Scales to account for typical ethanol content in the target market.

Why different MAF Scales for the same hardware setups?

This is the simplest way for the end user to have a tune customised to their car with the least amount of learning/tuning/work.

What will happen when I flash one of the alternate files?

• The closed loop portion of each MAF Scale is the same, therefore the ECU will learn the exact same LTFT value as "Default".
• The only thing that will change is the AFR at WOT and it will simply move up or down, it won't change shape.

How does the ECU learn fuel trims?

I will try to simplify the complexities of these particular cars as much as I can.
• LTFT is only learned in closed loop. Then is applied in closed loop and open loop (WOT);
• LTFT is split into 4 load zones, from idle up to WOT.
• You spend very little time in closed loop in the last zone, so it can take 100's of km to learn a final value for that zone.
• Further to that, the ECU attempts to learn different values for DI and PI, and interpolates between the two.
• Therefore, when the DI:PI ratio changes during a WOT, the LTFT also changes. This is one of the problems fixed in my roms.

Therefore, what kind of driving is best for ECU fuel trim learning?

Mountains - you will be using partial throttle at a variety of rpms, which will hit the last fuel trim backet in closed loop.

Therefore, what kind of driving is worst for ECU fuel trim learning?

• Highway - you will stay in the lowest fuel trim brackets.
• Racetrack - you will be in open loop the whole time.
• Cold start - too many compensations applied, so take it easy until warmed up.

Why different AFR targets for OFT and Tactrix?

OFT skews the logged data by adding 0.2 to both the AFR and Commanded AFR.
• You can observe this by comparing logged Commanded AFR against the values in the "Primary Open Loop Fuelling" table.

Do the petrol and E85 tunes disable fuel trimming (LTFT)?

No.

Do the flex fuel tunes disable fuel trimming (LTFT)?

No.

Do I need my AFR to match the Commanded AFR?

No.

Do I need to do custom MAF Scaling or use a MAF Scaling tool?

No.

Will you perform changes or help me make changes for pops, bangs or flames during overrun?

No.
• I find it morally reprehensible to remove all the catalytic converters in any car and I will not respond to people who do those changes.

Do I need my LTFT (long term fuel trim) to be within X% of 0?

No.
• Once the ECU learns LTFT, there will be no great jumps or bumps in LTFT across the load, whether LTFT is 0% or 10%, it's simply a multiplier, acting the exaxt same way as multiplying the entire MAF Scale by a scalar.
• On 85, LTFT will vary wildly to compensate for the different ratio of ethanol in the fuel. In this way you can use E85 as low as E50.

Can I disable LTFT in open loop?

Yes, change both values in "A/F learning #1 Limits" from -40/40% to 0, then perform any injector and/or MAF scaling required.

Reasons you may need to do this:
• You use a control fuel and need to race the engine shortly after battery reset with no time for LTFT learning.
• You have a shitty, unpredictable intake that produces an different LTFT all the time on control fuel or flex fuel (excluding pump E85 tune)

Why shouldn't I attempt custom MAF Scaling or use a MAF Scaling tool?

Simplifying the MAF Scale, it is broken down in two parts -
• Up to 60 g/s (about 3.1 MAFV) where LTFT is learned during closed loop (based on STFT).
• Over 60 g/s in open loop where LTFT is applied statically (not offset by STFT).

Here are the issues:
• When you modify the values in the CL part (under 3.3 MAFV), it will effect trims in the second, usually in the opposite direction that you intend, so you have to go and re-learn, re-test, re-tune the open loop part.
• The more deviations from a smooth scale you introduce, the more unpredictable fuel trim learning becomes.
• Fuel trims naturally vary due to weather conditions, engine health, etc. so at a certain point you start doing more harm than good.

If you think you really must have a low LTFT, all you need to do is multiply the entire scale by a single scalar.
• E.g. Take the E0 MAF Scale and multiply the whole thing by 1.07 for E10 fuel.
• Note: you may also need to adjust load limits as calculated load may change up to the same percentage.

FAQ - Adjusting Timing

Why is this section after the fuel/maf section?

You should ONLY attempt to adjust timing after you have nailed fuel. Otherwise you will de-tune the timing for no reason, which will effect power and economy.

How do I adjust the timing?

If timing needs to be reduced, it should be done in "Base Timing B" table.

I have re-tuned "Knock Correct Advance Max A" so that it's flat and so that Base Timing B" can be smoothed out and better analysed and adjusted.

When should I reduce values in Base Timing B table?

Only when the car has travelled 160 km / 100 mi after flashing or battery reset and the oil is above 90C and the knock is sufficient to reduce IAM (Ignition Advance Multiplier).

Will I see knock on E85 tunes?

You shouldn't, but certain setups (headers, etc) may flow differently or produce other effects in certain areas.

If you see knock but IAM does not drop, then don't pull timing from that area.

Should I add timing to E85 tunes?

No. You could over-advance the timing past the point of MBT (maximum brake torque), without any knock.

Dyno Comparisons

All graphs from the same dyno, same day (2015-07-18), same 20C intake air temp.

These are very old roms with original injector ratios, however still indicative.

6MT, E85, EL

OFT OTS 2.x - Stg2 EL E85 A00G

Wayne - Stg2 EL E85 v74 Rich A00G - same car

Local Expert Tuner - $300 Canned tune

6MT, E85, UEL

Wayne - Stg2 UEL E85 v74 Rich A01G

Local Expert Tuner - $1000 Custom Dyno tune

6AT, E85, UEL

OFT OTS 2.x - Stg2 UEL E85 A01I - log

Wayne - Stg2 UEL E85 v74 Lean A01I - same car - log

Local Expert Tuner - $1000 Custom Dyno tune A01I

6MT, E85 Catted EL

Local Expert Tuner - $300 Canned tune

6MT, 98RON, EL with BPB

Wayne - Stg2 EL 98 v74 Rich A00G

Local Expert Tuner - $300 Canned tune

6MT, 98RON, EL

Local Expert Tuner - $1000 Custom Dyno tune

6MT, 98RON, Catted EL

Wayne - Stg2 EL 98 v74 Rich 700G

6MT, 98RON, UEL

Local Expert Tuner - $300 Canned tune

Flex Fuel

What's involved in setting up flex fuel?

Each vendor has their own instructions, videos, etc.

On the RHD Moto East kit you can mount the sensor in such a way as to not bend any of the lines.
DO NOT attempt to mount the sensor over near the brake lines or strut tower, where you need to bend the fuel lines back on themselves.

With my files, you should attach the sensor to the DIRECT INJECTOR line as the car uses 100% DI at idle as per stock.

Cut a hole/slot in the firewall grommet above the engine loom for the sensor to ECA loom.

The most difficult part of the install is getting at the ECU, particularly for RHD where there is an extra control module in the way.

You can either remove the EVAP pin from the ECU plug and re-pin it, or Moto East sells a harness which goes between the ECU loom and the ECU.

• The lump of black wires pictured on the far left is the EVAP harness.
• The white wire sends output from the ECA to the ECU via the EVAP harness.
• The flexible black plastic sheath runs from the ECA to the sensor, and houses power and ground from the ECA and signal wire from the sensor.

Moto East provide a piggyback for the fuse box to provide power to the Ethanol Content Analyzer, mounted behind the dash in front of the drivers knees.

The gauge tells you if the ECA has power and is outputting a signal. It won't tell you if the signal is reaching the ECU, you need to log for that.

ECA Scaling:

Original ztan thread:

Glossary