Nissan ECU Tuning

cb_drift · Joined: 04 May 2004 Posts: 468 Location: New Zealand

It can be done - place in the states called number1 tuning or something like that.

$700us per ecu tho

ecu gets sent to them - they modify it with a surface mount board getting installed into the ecu and then send it back (no user installable components)

you end up with an ecu with eprom sockets in it that you can run a "normal" emulator in Smile

have fun with the info

aus already has a distributor for them tho and apparently (havnt checked since i left) noone else in aus can get them direct from the supplier they have to go thru dr drift in melbourne...

still cheaper and easier to reuse an r32 rb20det ecu and just get a cam switch (buddy club from ebay is around $80aus i think)

speedlab · Posted: Sat Sep 08, 2007 4:30 pm Post subject:

Yep! its a good way to go
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shredder · Joined: 08 Sep 2007 Posts: 5

would i have to swap injectors 4 and 6 to use an RB20DET ecu?

I read somewhere about wiring the variable timing to ground. does anyone know how to do that?

cb_drift · Joined: 04 May 2004 Posts: 468 Location: New Zealand

dont have to swap injectors over - its a straight plug n go swap (after getting the right rom)

use a cam switch - not a permanent wiring job - it works better

shredder · Joined: 08 Sep 2007 Posts: 5

you wouldnt have any roms to get me started would you?

darkhalf · Posted: Thu Sep 13, 2007 12:27 pm Post subject:

Those R33 boards are good (having just returned Dr Drifts) and I manged to get maptracing going for them also but just too expensive for what its worth

Understandably removing the CPU and installing the transition socket requires professional tools and patience. Its not as easy as removing an EPROM chip

Calum · Joined: 11 Feb 2004 Posts: 226

What processor do those ecus use? Is it still 77xx?

darkhalf · Posted: Fri Sep 14, 2007 5:22 am Post subject:

Hitachi used the HD6303 processor for earlier models (HR31/HR31/CA18/Z32) and then after the Motorola lawsuit switched to the H8/534 (PROM MCU) for R33, H8/536 (PROM MCU) for some R34, 539F (FLASH MCU - QFP) for HCR34

Also should be noted that JECS used the Mitsuishi 7700 16 bit processor was based from 6500/6502 which was copied by MOS Technologies engineers who worked at Motorola who worked on the M6802 who also got sued...

These boards allow external processor connection however the lines must be multiplexed which is what the daughterboard does. the main problem is once the 84 pin PLCC chip is removed finding a way to attach an external daughterboard to the main PCB.

Current boards use a transition socket but those cost about $400 each from prices I have found so far which make it uneconomical in itself. The board I looked at has two 68 pin PLCC chips which are scrubbed and locked. PCB is multlayered also making reverse engineering difficult

Eric · Joined: 17 Nov 2003 Posts: 254 Location: Holland

I have a chipped BCNR33 ECU here from a highly modified BEE-R334.

it looks like they just socketed (and "re"-programmed) the H8/534 MCU in the standard 24U00 ECU.

No daughterboards or other crap:

maybe it can be done like this in other R33 ECU's as well...

oh....and yes, I was able to read the ROM, although they (the guys from Top Secret) tried to copy protect it by disabling the consult ROM reading command....but that didn't stop me Twisted Evil

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darkhalf · Posted: Mon Sep 17, 2007 2:23 am Post subject:

Yes they can be rechipped like that using standard PLCC socket but the main problem still lies with retuning them which is where you require an ECU fitted with the daugtherboard.

Those MCUs contain a PROM which are programmable using a special adaptor to program via EPROM programmer. Havent done it myself but I know Tom who created NDS has done this

However those MCUs (available from GRID) cost ~$90AUD and programmable once only so you use it at the end when you have completed your tune

Idealy use the daughterboard with emulator for tuning along with RPM/TP maptracing (got this working in NIStune) and then burn to MCU afterwards once completed.

You are lucky to download the ROM. The daughterboard I had changes the C9 command to something else for ROM read. Dont know why since they used an EPROM chip in the board anyway (which was coded to run with the board when comparing against stock ROM MCU chip plugged into board)

TomR33 · Joined: 16 Dec 2004 Posts: 1 Location: Canberra AU

Try 0x54 instead of 0xC9 command to download the ROM. Is that what you used Eric? That's how the daughter board looks like:
http://www.fast-files.com/getfile.aspx?file=15557

darkhalf · Posted: Wed Sep 26, 2007 12:11 pm Post subject:

That was the value used for the daughterboard I used also ... be interesting if Top Secret used the same one or something different...

Pingu · Joined: 27 Jul 2007 Posts: 11

I've come across a mines one, similar in modification. Hoping it's a different MCU but will find out!