This is a link to a thread that states he has been able to tap into the SR20 ecu and be programmed for $40 dollars, http://www.nissanforums.com/showthread.php?s=&threadid=3892 . How feasible is this plan? Is it possible?

This is EXACTLY what you get when you buy a JWT ECU. I'm surprised that no one has yet offered this here in the US.

JWT does nothing different. The daughterboard gives you a socket to plug in a DIP packaged ECU that you can remove, reprogram, etc to alter maps, redline, etc. There already exists freeware ROM editors for doing this.

THIS IS WHAT YOU GET WITH A JWT ECU!


Originally posted by SucKit
This is a link to a thread that states he has been able to tap into the SR20 ecu and be programmed for $40 dollars, http://www.nissanforums.com/showthread.php?s=&threadid=3892 . How feasible is this plan? Is it possible?

Let me know where to send you the $40 dollars. I want it.

What kind of chip is the EPROM ? This is pretty exciting stuff.
It would be great to be able to reporgram the ecu.
What kind of information would you provide along with the hardware ?

Originally posted by SucKit
This is a link to a thread that states he has been able to tap into the SR20 ecu and be programmed for $40 dollars, http://www.nissanforums.com/showthread.php?s=&threadid=3892 . How feasible is this plan? Is it possible?

Ok,
i should be reciving the first batch of boards in the next comming days, and will have them constructed and tested by the weekend.

i've also found someone that has ALL the base map files for every nissan car, so i shall be able to do every s13 atm:

sr20de (r)ps13
sr20det (r)ps13
sr20det rnn14/u13 gtir

Basicaly, i'll be selling that constructed, with two base maps, one stock standard map in position 1, and a speed limit / rev limit removed 2nd map.

I also have a *** semitunned map for the gtir pulsar, a 550cc inj + z32 afm sr20det map, a 386cc (turbo inj) +z32 afm sr20de (with turbo bolted on) map. please ask me specificaly for these maps. the 550cc + z32 map i'm not 100% on. The sr20de + turbo map requires some dyno time to get accurate fuel maps, but the gtir maps run damn fine!

please email me confirming that you want a board, badbiki@bigpond.net.au?subject=[SRboard]
state your name and how many boards you would like, and with what maps, and i'll add you to my database of orders to be processed.. arangements for payments can be settled via email once i give you an order number

I'll accept Paypal, cash moni, direct deposite, cod at your expense

Final cost is going to be

$95AUD
$48USD

shipping is your cost and decision.. they'll fit in a std airmail bag fine.

if you can organise a bulk purchase between friends even better! I'll give those who can get 5+ boards in one go a discount.. email me..

i'll get some infomation up soon, but i think Chad is currently making a WWW about sr tunning.. so there may be no need, but i'll try and help him out with some resources... he'll be selling eprom burner kits i think *shrugs*

FUTURE DEVELOPMENT!!!

an EPROM emulator for these boards.. i'm trying to develope a real time eprom emulator to tune these boards in a dyno properly.. unknown eta, but i'll get them done one day

Communication over.....

Originally posted by badbiki

i've also found someone that has ALL the base map files for every nissan car, so i shall be able to do every s13 atm:

sr20de (r)ps13
sr20det (r)ps13
sr20det rnn14/u13 gtir

...

FUTURE DEVELOPMENT!!!

an EPROM emulator for these boards.. i'm trying to develope a real time eprom emulator to tune these boards in a dyno properly.. unknown eta, but i'll get them done one day


Hmmm.. the ever-present question... How about FWD SR20DE? (i.e. Pulasr SSS)

And again... the emulator will be IT!!!

Chris

n14 fwd sr20de's?

not 100% sure yet.. but i've gont a n14 gti-r ecu..
s13 sr20de
s13 sr20det ecu's..

i wouldn't see why not.. but i'd have to check

Would it help to send you the USDM stock ECUs for you to tinker with?

I've got even another suggestion. My buddy Ben Moses works at Delphi automotive and is starting to get into this type of area. He has an EPROM reader and I think can read the EPROM off a Nissan ECU. Could we send you the code electronically to look at?

Ben:Could you make a copy of the bin off the nissan ecu image?

I ordered one of these daughterboards and have an eprom programmer along with a few nissan sr20 and ca18 maps already. I am going to solder this daughterboard to my extra ecu, tinker with the fuel and ignition maps and "see what happens" ;). I'll let you guys know more once I start the project.

Ben Moses' email address is ben.l.moses@delphiauto.com. Contact him directly about the images. I emailed him a link to this thread and he has not responded to it yet.

Originally posted by Ben92SentraSE-R
Would it help to send you the USDM stock ECUs for you to tinker with?

I've got even another suggestion. My buddy Ben Moses works at Delphi automotive and is starting to get into this type of area. He has an EPROM reader and I think can read the EPROM off a Nissan ECU. Could we send you the code electronically to look at?
Ben,

the EPROM in our ECUs is this nasty 68pin (or 86 or something) chip on the top right of the ECU. It is not a standard EPROM.

1st, are you sure the reader in question can actually read it?
2nd, you realize you will have to de-solder it. Not a job for the faint-of-heart unless you have a damaged ECU with a known-to-be-good chip.

As far as I know there is no other (than desoldering and using a very expensive reader) way to read the ROM from our cars.

Chris

Can't you like get some small wires and just wrap them around/solder them to each lead on the EPROM and touch the wires to the socket pins of the reader? :) I'm half joking, but half serious as well.

Actually I have no idea!

However, usual ROM readers/writers deal with a finite # of different chips. I have a reader/writer myself (used for standard PC roms) and there is no way it would read the chip from an SR20 ECU.

From what I have seen you must have a reader/writer that CAN read it and an adaptor that can receive the chip. Very rare! Also our chips are not EPROMs in the usual sense, they are more like EPROM-One-Time-Only!.. :)

Anyway, lets hope that what BM has can actually read our thingy...

Chris

bah =P just buy one of my boards and do it that way!

its easy as!...

i have maps for the sr20det, sr20de, sr20det (gtir) s13/n14's =)

I don't have a ROM reader, but, in the past, I have tried to find data sheets for either of the processors inside our ECU's to no avail. I believe I discovered that it was a Motorola clone, but that's about all I could find out. I think I did get a matching pinout (with the funky numbering scheme) from Motorola's website a long time ago, but I could not re-find that document. Nor could I even come close to finding any other information on it. The name JECS is printed on the chip, but there's no technical information on their website. After I attempted to monitor the Consult port pins with a scope and got nothing I totally gave up on trying to speak electricity with this thing. I did note the type of ROM chip that JWT used, I believe mine was an AMD 1024K chip. I wrote the numbers down somewhere a while back.

That's pretty much been the extent of my dealings with our ECUs.

well its damn easy!

you know the 40pin connector that isn't soldered in inside the ecu? well i've made a board that connects up to it!!!

re-tune your ecu! change settings and crap!

I've done some research about modifying the ECU, and the way badbiki is doing it, is the way tuners in Japan do it. The CA18 Ecu has an EPROM you can pull out and stick in a eprom programmer, because as I read it is a standard 28 pin EPROM.
The SR20 ECU's require the use of a daughterboard with extra eproms, then this is attached to this 40 pin connector on the ecu.
The daughterboard holds 2 eproms which is what you reprogram and these signals are fed to the ecu through this 40 pin connector.

As I understand Nissan put this connector inside the ecu specifically for NISMO to add their own tuned chips for their competition cars.

Dude, that is mega awesome tight, fresh-easy! :) Anyway, it sounds like you are talking about the same place where JWT interfaces their stuff. Now, how does one go about making changes to the ROM? Have you made a PC based front end for this? Or you need a ROM programmer?

I'll you guys know more when I progress with the project <cough cough> start it <cough cough>:D

yes it is the same place JWT interfaces their stuff, they don't really have a choice, I don't think :) The changes to the ROM can be made with a hex editor or a ROM Editor. I'm working on putting together a write-up webpage or something like that when I have more hardcore data.

Basically all the information, (yes I'm stating the obvious) is stored in different addresses on the EPROM. The calculations are not really that bad to figure out in hex, the values for simple things like raising the RPM limit and speed limiter but more involved for fuel and ignition maps, but that's where extrapolation comes in and using some preset values :)

exactly!