Z31 ECU

Nistune topics specific to the 6802 cpu

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Zedstar
 

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Location: Melbourne , Australia

Z31 ECU

Post by 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
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Re: Z31 ECU

Post by 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
 

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Location: Melbourne , Australia

Re: Z31 ECU

Post by 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
 

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Location: Melbourne , Australia

Re: Z31 ECU

Post by Zedstar »

Managed to upload correct device software to programmer , read 86 chip and load it to Nistune. It definitely appears to be standalone .
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Re: Z31 ECU

Post by Matt »

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

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Re: Z31 ECU

Post by Zedstar »

It does have a 24 pin chip next to it , but does appear to be standalone.
1986Z31C.bin
1986 BIN
(16 KiB) Downloaded 122 times
image.jpeg
1986 ECU
(2.64 MiB) Downloaded 1600 times
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Re: Z31 ECU

Post by Matt »

Both 16K and 1K chips need removing.

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

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Location: Melbourne , Australia

Re: Z31 ECU

Post by Zedstar »

Thanks Matt

So with those cops removed the 86 ECU will be operational with reprogrammed 28 pin chip ?
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Re: Z31 ECU

Post by 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)
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