2jz Help

[TRD_Ja]

Hi can some one assist me with the soft ware setup for a 2jzgte non-AFM having a bit of issues. I am running a det3 400kpa set up
Thanks

[Jadzwin]

Hi!

What issue do you have ?

[Addi]

Hey guys, I am doing the same setup; running in basic mode not FIT. A couple questions:

1. Post wiring the 2jz ecu based on the 1jz pinout provided, im a bit puzzled with the setup tables for the fueling. For the 1JZ it says for Fuel Table set
Modify - Analog in #1
Load - Analog in #1
both corrections set to disable.

Car starts fine but I'm seeing a voltage reading in Analog in #2 which has no wire connected, is this my onboard 400kpa map sensor reading and is it that I should set Load to Analog in #2 to read from my 400kpa map?

2. Assuming I should set Load to Analog in #2, is it that the DET uses load as a reference to modify the stock map voltage to create an output to the stock ecu? Hence The stock map sensor must be connected? Can I just run on the 400kpa map sensor only?

3. Assuming the stock map sensor must be connected, does this apply to FIT mode also? Can I use the onboard 400kpa only in FIT mode?

Thanks in advance for the assistance guys

[Kisielisodd]

Hey guys, I am doing the same setup; running in basic mode not FIT. A couple questions:

1. Post wiring the 2jz ecu based on the 1jz pinout provided, im a bit puzzled with the setup tables for the fueling. For the 1JZ it says for Fuel Table set
Modify - Analog in #1
Load - Analog in #1
both corrections set to disable.

Car starts fine but I'm seeing a voltage reading in Analog in #2 which has no wire connected, is this my onboard 400kpa map sensor reading and is it that I should set Load to Analog in #2 to read from my 400kpa map?

If You are planning to use FIT mode, or drive with higher boost then 210 - 220 kpa of boost You should Use readings from analog #2 as a load.

2. Assuming I should set Load to Analog in #2, is it that the DET uses load as a reference to modify the stock map voltage to create an output to the stock ecu? Hence The stock map sensor must be connected? Can I just run on the 400kpa map sensor only?

To change mixture,You have to modify signal from load sensor (i assume it is MAP not MAF) so it have to be connected and set as a modified signal.
If You wand to relay only build in 400 kpa MAP sensor, MAP to MAP conversion is required, which from my point of view is pointless if You are not planning tu use FIT mode . Just connect it to analog #1
Build in sensor is just a reference signal, and ECU still need to see correct readings from stock map for proper ignition timing.

3. Assuming the stock map sensor must be connected, does this apply to FIT mode also? Can I use the onboard 400kpa only in FIT mode?

In FIT mode, stock ECU still controls ignition timing based on load sensor (MAP). Different readings will result wrong ignition timing. You don't have to modify signal from sensor, because injectors timing is calculated from DET3 unless You will use boost higher then boost limit in stock ECU.
Boost going over boost limit, will result boost cuts and finally limb mode in ECU.
The idea is to cut signal from stock MAP near boost limit. Mixture will be correct because map sensor in DET3 reads up to 300kpa of boost. To cut signal, it has to be connected (or generated from DET3 as a MAP to MAP conversion)




Thanks in advance for the assistance guys[/quote]

[Addi]

Hi Kisielisodd, @Trdja sorry to jack your thread man I hope im helping both of us.

So Kisie, firstly yes the stock is map and not maf; ill be running in normal mode for now. Fuel Setup is now:

Modify - Analog in #1 (stock 1.5 bar map)
Load - Analog in #2 (im assuming this is the 400kpa for reference).
Both Corrections - Disabled

Now on stock ecu, boost cut is at 15psi. Based on what you are saying in normal mode the only way I can run over 15psi is if I go bigger injectors and pull fuel/map voltage down just like an AFC? Only with the advantage of the ability to retard the timing bump?

I get that in FIT mode I can just clamp the stock map draw down the ignition timing at the clamped volt and use the onboard map sensor to drive injectors directly which is good. Let me know if im on the right track.

[WHPZach]

Hi Kisielisodd, @Trdja sorry to jack your thread man I hope im helping both of us.

So Kisie, firstly yes the stock is map and not maf; ill be running in normal mode for now. Fuel Setup is now:

Modify - Analog in #1 (stock 1.5 bar map)
Load - Analog in #2 (im assuming this is the 400kpa for reference).
Both Corrections - Disabled

Now on stock ecu, boost cut is at 15psi. Based on what you are saying in normal mode the only way I can run over 15psi is if I go bigger injectors and pull fuel/map voltage down just like an AFC? Only with the advantage of the ability to retard the timing bump?

I get that in FIT mode I can just clamp the stock map draw down the ignition timing at the clamped volt and use the onboard map sensor to drive injectors directly which is good. Let me know if im on the right track.

Larger injectors are your best bet for overcoming fuel cut. It's easier with the USDM 2JZ since the MAP sensor is only used for fuel cut and can be clamped with little ill effect. FIT will require quite a bit more tuning and wiring than running the DET3 in the normal configuration. You can clamp the MAP signal by altering the max voltage value in the analog outputs menu.

Regardless, it's an extremely good idea to pick up a set of used 550s and a resistor pack at the very least, since they can be had for $150 pretty regularly. You'll be so close to the limits of 440cc injectors at that boost level (especially if you're running anything other than stock twins) that it's a risky proposition to try to cheat it much further.

[dan_t]

Is it even possible to run the DET3 in FIT mode with the 2JZ? I believe its limited to 4 injectors max or is there a work around for that?