Z31 ECU

[Zedstar]

Friend of mine recently had 220cc injectors installed in his 85NA. Mechanic told him ECU would be fine , however as most of us know the ECU is tuned for 160cc. The car is naturally running very rich.

He cannot afford a Nistune Board at this stage. I have an 86 Turbo ECU (260cc injectors) which comes with a 28 pin EPROM. Is is possible to socket the EPROM and replace with Nistune stock bin with an adjusted K Constant as an interim measure ?

I am aware of the additional wiring required to the CPU etc for the Type 1 Board and the Z31 series 3 ECU is the preferred ECU for modification.

[Matt]

K constant will only move the TP (and help with fueling issue) but other scaling is required. Yes you can save files from Nistune to burn to chip

[Zedstar]

Thanks Matt

So am I correct is assuming that the EPROM in the 86 Turbo is standalone , whereas in the 84- 85 ECU Fuel and Timing maps are apparently included in two EPROMs . I have attempted to Read the 86 Bin but my programmer does not have the correct device software.

[Zedstar]

Managed to upload correct device software to programmer , read 86 chip and load it to Nistune. It definitely appears to be standalone .

[Matt]

1986 if it has 28 pin chip only (and not 24 pin next to it) is standalone

[Zedstar]

It does have a 24 pin chip next to it , but does appear to be standalone.

1986Z31C.bin

1986 BIN

(16 KiB) Downloaded 219 times

image.jpeg

1986 ECU

(2.64 MiB) Downloaded 1600 times

[Matt]

Both 16K and 1K chips need removing.

Other chips are AD (46510) RAM (NEC), processor (6802) and ASIC (JECS)

[Zedstar]

Thanks Matt

So with those cops removed the 86 ECU will be operational with reprogrammed 28 pin chip ?

[Matt]

... and move the jumper. Same as the Type 1 board install for these ECUs (please refer Type 1 hardware install manual as its all covered in there)