An inside look at RCTS CANADA's Map Tuning for 2JZ-GTE, 7M-GTE and HKS VPC by Reg Riemer

For interest sake only, RCTS no longer supports ROM tuning the Toyota ECU's, We use the HKS F-Con Vpro v3.3.


Almost one year to date from the time I purchased the Techtom hardware and dealer program, I have completed testing and programming the 7M-GT TCCS for a stage 2 level for use with the original Lexus upgrade developed many years ago. This past year I worked very hard with my Techtom gear plugged into my old and favorite car, my 7M-GTE powered 1982 MK II MA-67 Supra GTE as well as my One Lap of America JZA-80.

My Supras now uses HHKS F-con Vpro v3.3!

82 Supra GTE

1994 One Lap Supra now uses HHKS F-con Vpro v3.3

I intend to work on these two engines for the rest of my life, this is why I have the Techtom dealership!

I plan to be around when the governments of our countries say that all of these muscle cars with parts hanging of of them are pollution pigs and now they must meet newer pollution standards. There is no way that someone is going to tell me I'm not allowed to drive my Supras. Because of this looming worry,  I will borrow some very well known thought processes that were first used by my favorite car company Toyota back in the 1930ís the principle and reasoning of Kaizen, or continuous improvement. By starting work on this when we have we will be ready for big brother should this day ever come.

The pictures of the laptop screen show the 7M-GTE ignition and fuel maps as well as one of the tracing screens of the 7m-GTE TCCS maps outlining comparisons of the ignition maps for the 7M-GTE stock and Lexus Stage 2 spec.

This new software has taken the original Lexus upgrade to a higher power level with a full re-mapping of the fuel and ignition to allow for no change in learned value system across the much higher load areas some of us run these engines. The three register areas of the ROM data that Techtom Japan-(G-Force) have already outlined in the code are still available.  As well I will be adding curb idle adjustment, O2 feedback table re scaling and a few other areas are also in the mix with my software for the TechTom ROM boards for 7M-GT Lexus fuel upgrade.

I have now completed design and CNC manufacturing of the spacer plate that I originally intended for use on the 89-92 7M-GTE as well as some 87 & 88 7M-GTE ECUS. The first production batch was ready on Feb 12/2002. I have discovered that fitment of my spacer plate allows all of the 7M-GTE ECU's to have more needed room in the computer to allow the RCTS dual or single program ROM board to fit inside the ECU without requiring the modifications to re-locate a lot of parts inside the ECU. Also, the plate allows for more heat dissipation inside the ECU. For these reasons I will be using the spacer plates on all of the 7M-GTE ECU's. The plates also have a custom CNC engraved RCTS logo and carry the Toyota factory fit and finish. Techtom supplies a cast spacer for the dual board 2JZ-GTE TCCS but nothing has been available for the 7M-GTE TCCS until now!

Trick new RCTS CANADA CNC 7M-GTE and GE Spacer Plate

Spacer Plate in action on a 87 Supra Turbo ECU


What the New Software Does:

I have identified a number of previously unknown maps and full registration areas in the 7M-GTE TCCS. My blue GTE car ran many (too many, I felt sorry for it a bit :-Q), 1.3 bar of boost runs on the track and open road. Sometimes testing fuel-cut and load-cut point caused rubber to be left on the road at 90 MPH! So far the gains have been amazing, ignition maps have made great gains in my GTE car on the road, boost response is faster due to more timing as much as 22 degrees more before spool up. With winter here in full force, I have not been back to the Dynojet for RWHP numbers, I will do this in the spring. However my old GTE car no longer hooks the power of stage 2, with my stage 1 Lexus setup my car hooked well in all gears. Now with my stage 2 ECU, tires can be scalded at will in 2nd or 3rd gear. Back to the drawing board in the suspension department, just like my maiden voyage eight years ago when I first put the 7M-GTE in my 82.

See below for other areas I will be working on. Techtom Japan-(G-Force) had already outlined register areas of the ROM data hex code for fuel-cut and Rev Limit. RCTS has identified a number of previously unknown maps and full registration areas in the 7M-GTE TCCS.
As of today the complete list of known Hex registration located is as follows:

*Rev Limit (fully adjustable from 700rpm to 9000rpm+/- I can work out the hex value and tell you exactly, 50rpm per hex number, hex FF max, Dec 255)
*Load-Cut (yes load cut, I can set it so my car will not make a hill in third gear at one setting and make it up the hill, two number values higher)
*Fuel-Cut (Yes, and it is fully adjustable from about 1 psi to no cut at all)
*closed throttle deceleration fuel cut
*Cold Idle Open Loop Table
*Ignition Map (full 3D map x-Rpm y-Load)
*Open Loop lookup Map
*O2 Sensor Closed Loop Lookup Table
*Idle Speed Lookup Table

Dual Program's in one ECU available at the flip of a Switch:

The A program in the ECU can be what ever the Supra Nut wants., some possibility's are;

-1 Valet Mode program, low rev limiter, 2500 RPM, or what ever you like
-2 Valet Mode program, low boost-cut point, .5 PSI, or what ever you like
-3 Valet Mode program, low load-cut point, 5% to 30 % Duty Cycle, or what ever you like
-4 Original Stock Toyota program as is just as if we have not opened the TCCS
-5 Bad Gas program :-Q
-6 Race Gas Program (TBA)
-7 So your friend can win program, gut-less wonder Program, dead ignition map, all map values 0 advance, Supra feels like a sick turtle, stuff this little chip into your friends supra for an April fools day present :-)
-8 Your email suggestions on ideas for A programs

The B program will be for 91 octane or higher.

The boost-cut point on this program can be set to what the Supra owner wants up to completely removed-(not recommended). Also the size of turbo and the rpm boost start point can be set for ignition map. The load-cut point will be set for 85 to 90 % duty cycle max for safety reasons.

Coming soon: Sound of the Supra GTE dual switching between Valet and Hot program!!

7M-GTE TCCS ROM Boards and RCTS Software:

Re-programming the 7M-GT TCCS for a stage 2 level for use with the original Lexus upgrade developed many years ago. We have been working very hard with the TechTom gear installed in the Blue 7M-GTE powered 1982 MK II MA-67, The pictures of the laptop screens below show the 7M-GTE ignition and fuel maps, as well as one of the tracing screens of the 7m-GTE TCCS maps.

This new software takes the original 550 Injector and Lexus AFM upgrade to a higher level with addition of full re-mapping of the fuel and ignition to allow for Toyota stock idle and street performance coupled with a much higher load map and boost potential while still keeping the safety of the fuel-cut at a higher than ever point.

The Supra GTE has been running up to 1.3 bar of boost on the track and open road for the past 4 months, With countless hard 1.3 bar pulls on road tests, making fine adjustments to the Ignition, Load Fuel-cut, Boost Fuel-cut and Fuel maps, the gains from the software have done amazing things to the old Supra GTE's already fantastic 7M-GTE performance.


A Look at the Closed Open Fuel Map, blue markers on cells show where the engine is sitting in real time, (Tracing Mode)

Graphics Mode look at same Fuel Data

The 7M-GTE ignition Map

2JZ-GTE Engine Software and ROM Board Installation:

TCCS ECU's in the 1994 & 1995 JZA-80 require two ROM boards for complete control. One board is for ignition mapping and boost management for Twin Turbochargers and the another board for Fuel Mapping. The board for Fuel Mapping is where the Hex Data is saved for Rev-Limiter, Speed-Limiter and Trace registration these registration areas are located in the Fuel board software hex file.

Development is in progress in Japan for ROM Boards for the 1996 to 1998 OBD II Supra ECU's, more on this as we get word on availability!

These ROM boards with good software made a huge difference to the performance of the 2JZ-GTE when running larger single turbochargers. I have made a number of changes to the software in my One Lap Supra, mainly in turbo response and reduction of lag. The Ignition map for a Single turbo 2JZ-GTE is completely different than the stock maps for the twins. Because the stock ECU is expecting boost through the range that the single turbocharger is still in lag, the extra ignition timing in this area helps pull up bottom end turbo response. The Rev-Limiter can safely be raised to 7500 RPM with a big single setup and power will continue to rise to the limit point. We have run this for years of road racing with our One Lap Supra without any problems. This adds about seven hundred RPM to the power band of the 7M-GTE. Dual programs for the 2JZ-GTE allow the comparisons of the stock program to the custom one or like the notes above one of the two programs could be a valet mode with low Rev-Limiter and so on.

Software for 2JZ-GTE with stock Turbos does not offer huge improvements other than the Rev Limiter, Speed Limiter, and boost control using the stock TT VSV system to raise the boost while retaining factory waste gate control connections and hardware. However RCTS does not recommend more than 1.1 Bar of boost on the Stock Twin turbos for any length of time. Turbocharger damage will occur at these types of pressures with extended operation and daily cycling! More on this at the SONiC site.

Here is a look at the 1994 2JZ-GTE Twin Turbo Stock Ignition Map

This 2JZ-GTE ignition map is a triple interleaved 3D Map.  You can feel the odd effects of this map best after you go to a big single turbo setup. I'm sure many of you with big single turbo-ed 2JZ-GTE's have noticed the effects of this map in action. Depending on where you start a boost pull you will feel varied performance from your engine. Remember it was designed for the stock twin turbos and they provided the engine with boost in the low rpm ranges.  A Bigger single turbo does not have boost there so the ignition map for a single turbo such as the one in the One Lap of America Supra is totally different.


RCTS can change the VPC software in the following ways:

We can actively trace and (watch the VPC reading the EPROM software when driving the car) Real time VPC chip tuning requires the vehicle to be at RCTS, labor rates for tuning like this is 50.00 per hour. RCTS already has a number of happy customers you could talk with for more info.

As well we can change VPC chips based on backwards Engineering the software (not necessary to drive the car) by reading the file from the EPROM, then by editing the areas of the maps to move VPC O'clock dial maps and data around to meet specific VPC users requirements. The IDLE, GAIN and Option Out areas of all the independent VPC Dial O'clock Maps can be changes so the percentage change per click is more or less than the stock 2%. We can move any dial map's from 6 O'clock to 12 O'clock or whatever. As well we can make the range from 7 O'clock through to to 6 O'clock anything you want richer or leaner in any degree of % increase per click.

Another example would be to leave 12 O'clock where it is and make the percent change per click more than 2 percent say 5%, 10 %, 15% to help get a car that is not close to tune, in tune. Or less than 2% or maybe 1% changes could be used to dial in a car that is already in very close tune. This is very useful for anyone that may be running a engine with some non HKS program mods, off brand injectors, different fuel pumps, fuel lines, Camshafts and other engine mechanical changes. Because the VPC is a pressure sensor based speed density system, changes in particular engines cause the fixed HKS program to be too far off the scale to get the engine running in perfect tune again. With custom chips you can then dial the particular car in again to meet your requirements.

Some notes on the custom VPC software by RCTS CANADA:

-A For best results with VPC re-tuning this way you need to know where you are with rich & lean under different conditions with your current VPC chip.

-B Chip reading, editing and burning costs $250.00 USD for the first chip and $95.00 USD for more sister chips if a series of chips is required.

HKS VPC EPROM software tracing and hardware setup inside the One Lap Supra for Real Time Emulation and Tracing for in car Re-Tuning of VPC

Air Temp Correction Table (Graphics Mode)

RCTS's VPC registration database file for 720 cc injectors

All support and parts are discontinued as of 2014, we use the HKS F-Con Vpro in all Supras



Pictures of the hardware before and after installation:

Stock 87 7M-GTE TCCS ECU

View of stock Toyota ROM chip, soldered into place, chip contains ROM data and CPU, without a ROM Board the stock program is sealed in for life. Tell me how some tuners say they can chip the Toyota ECU without the addition of a ROM Board


This view shows the Same chip (the one with TechTom decal) as in above shot now inserted into the TechTom ROM Board. The chip with RCTS CANADA decal is the new 512k RCTS Dual Program EPROM. This can be changed with ease by the car owner at a later time if an update is required.

The large square chip above the Toyota CPU/RAM/ROM chip is the Techtom Scramble Chip. This chip is used to decode the software that RCTS burns into the RCTS Canada Chip. The programs are all protected and are copy protected as the data is all encoded to Techtom Dealers Scramble ID.

CNC RCTS CANADA Spacer Plate for 7M-G Engine ECU's 87-92

Dual Program Switching Wire is Visible here. Just connect the two wires and you have your hot program

with spacer plate and complete setup complete with switch-able on the fly dual programs.

Only available from RCTS CANADA!

For more Info on the HKS F-Con Vpro contact;


office phone# 1-403-259-3106


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