K11 daughterboard - SR20 Forum
 
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#1 (permalink) Old 07-07-2009, 10:39 PM
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K11 daughterboard

Calum, does the B13 basic board fits K11 ECU?
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#2 (permalink) Old 07-08-2009, 01:50 PM
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No, they need a totally different board. I don't know of anyone that makes a board for that ECU. I've got a K11 ECU and I could make a board for it, but I've never pursued it because-

-There are no K11s in the US, so it's hard for me to gauge what the demand actually is
-There are no US ECUs that have the same hardware architecture
-Shipping ECUs etc back and forth is slow internationally
-Just having a ROM board is a first step, developing programs is the next leap and...
-...that would be hard for me to do without actually being able to work on a K11
-I don't know how the immobiliser works on the later cars, or if there is something that needs to be done on the daughterboard side. I doubt it so this probably isn't an issue, but the immobiliser you guys got is different than what was sold in the US.

The bins I've looked at look very similar to a 94 USDM B13, but really it would take someone that knew what they were doing playing with a car to get things at a decent working shape.

Also the very late model ECU's dont have the supports for the daughterboard milled. This is kind of hard to explain without having seen it. This makes installing a board in those ECUs virtually impossible for most people unless you've got access to a mill (even a little table top one could mill the flats though, the aluminium is very soft).

Remove the top cover of your ECU and post a couple of nice hi-res pictures.
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#3 (permalink) Old 07-08-2009, 03:36 PM
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At the moment i dont have hi-res photo, but i will post the ones i have.

This is my ECU:



Has this conector (30pin+20pin):





I talked to NIStune and they prepared a Type4 board for my Micra K11 (Face-lift)

But Pre-Facelifts uses a different type of ECU, called "half-size" (20pin+20pin):



Its the same patern as B13:



Dont worry about later K11 and he NATS issue, i only want to know how about the Pre-Facelifts.

Can you enlight me about this matter?

Best regards
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#4 (permalink) Old 07-08-2009, 04:35 PM
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So which one are you looking for, the early or the late?

I've got a couple of the late ECUs (like your first pic), and that's what I was referring to in my first post.

On the early one (last picture) I don't make a board for it but www.grid.co.jp does and they do ship internationally. I've installed a couple of these boards, and translated installation instructions (they will give you them in Japanese) are posted somewhere on this site. Search for GA16DE daughterboard.
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#5 (permalink) Old 07-08-2009, 05:47 PM
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Sorry, i want infos for the early ones, because i already have solution for my later ECU, NIStune modified a board so it suits on my ECU.
But i have to use S14a ECU box because of what you said about the milling, i dont want to touch my stock ECU box.

I was reading infos about Grid board, but it looks a little difficult to install it, yours is much simplier...
Does micra_pete has any info about K11 daughterboard?

So, the GA16DE board fits K11? From which year does it fit? Do you sugest any brand of board?

Thanks
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#6 (permalink) Old 07-08-2009, 06:35 PM
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Yea, the newer K11 case that needs to be milled just looked like a royal PITA to work with.

The grid board isn't that hard to install, it's just got a bunch more jumpers that need to be set. You would have to do that for any daughterboard and that ECU. I did a prototype board for the GA16DE ECU but never rolled it to production.

The problem with this ECU type is that the '7791 isn't a microprocessor like the other ECUs (e.g. '7790 on the SR20 stuff, etc) but is actually a microcontroller. The difference is the '7791 has the RAM and ROM internal, but can be set to use external ROM. The problem is when you do that the pins that now form the memory bus previously did something. Those pins get memory mapped to external stuff that handles their functions, making the daughterboard a little complicated. I've got a thread posted here somewhere that details this.

This is the grid board you want-

http://www.grid.co.jp/en/prod/prod186.htm

You want the 'early' Mitsu version (just order from that page). I've never seen the 'late' Intel based ECU and suspect it wasn't widely used outside of Japan. Grid speaks no English btw, but they've got no problems shipping internationally.

The only other vendor I've seen that has a board for that ECU is this guy-

http://page4.auctions.yahoo.co.jp/jp/auction/d94227098

I think that's the board Pete has used. I've never contacted the seller so I've got no clue how good his English is or if he'll ship outside of Japan.
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#7 (permalink) Old 07-08-2009, 06:36 PM
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Btw Matt at NisTune knows all about these ECUs, just ask him about the shorty ECUs.
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#8 (permalink) Old 07-08-2009, 06:36 PM
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Second PS, the grid board is an odd/even board FWIW.
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#9 (permalink) Old 07-08-2009, 08:07 PM
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Quote:
Originally Posted by Calum View Post
Yea, the newer K11 case that needs to be milled just looked like a royal PITA to work with.

The grid board isn't that hard to install, it's just got a bunch more jumpers that need to be set. You would have to do that for any daughterboard and that ECU. I did a prototype board for the GA16DE ECU but never rolled it to production.

The problem with this ECU type is that the '7791 isn't a microprocessor like the other ECUs (e.g. '7790 on the SR20 stuff, etc) but is actually a microcontroller. The difference is the '7791 has the RAM and ROM internal, but can be set to use external ROM. The problem is when you do that the pins that now form the memory bus previously did something. Those pins get memory mapped to external stuff that handles their functions, making the daughterboard a little complicated. I've got a thread posted here somewhere that details this.

This is the grid board you want-

http://www.grid.co.jp/en/prod/prod186.htm

You want the 'early' Mitsu version (just order from that page). I've never seen the 'late' Intel based ECU and suspect it wasn't widely used outside of Japan. Grid speaks no English btw, but they've got no problems shipping internationally.

The only other vendor I've seen that has a board for that ECU is this guy-

http://page4.auctions.yahoo.co.jp/jp/auction/d94227098

I think that's the board Pete has used. I've never contacted the seller so I've got no clue how good his English is or if he'll ship outside of Japan.
So, S14 NA AT, K11, Z10, N15 and B14 boards will work? I can order S14 NA boards for less than $50...
If you have more information about this, please send it to baguete_isidoro@hotmail.com

Quote:
Originally Posted by Calum View Post
Btw Matt at NisTune knows all about these ECUs, just ask him about the shorty ECUs.
Ok, will ask him, he manage to put a S14a board to work with my ECU, so he must have some kind of info about it...

Quote:
Originally Posted by Calum View Post
Second PS, the grid board is an odd/even board FWIW.
Just a little bit more dificult, but nothing special...


Thanks for everything
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#10 (permalink) Old 07-08-2009, 09:54 PM
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Quote:
Originally Posted by baguete View Post
So, S14 NA AT, K11, Z10, N15 and B14 boards will work?
No, you can't go by car model when your looking at stuff from different countries. Different countries get different types of ECUs. For instance a USDM B14 ECU isn't anything like a JDM B14 ECU. Instead just go by the ECU architecture. After a while you can tell the difference between the different types of ECUs just by a look at the circuit board. That's why I knew the grid board above would fit a USDM B13 GA16DE even though that's not on the list of car models...
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#11 (permalink) Old 07-09-2009, 05:04 AM
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Quote:
Originally Posted by Calum View Post
No, you can't go by car model when your looking at stuff from different countries. Different countries get different types of ECUs. For instance a USDM B14 ECU isn't anything like a JDM B14 ECU. Instead just go by the ECU architecture. After a while you can tell the difference between the different types of ECUs just by a look at the circuit board. That's why I knew the grid board above would fit a USDM B13 GA16DE even though that's not on the list of car models...
I understand that architecture thing, thats why i asked Matt about if Type4 would work on my ECU, and he manage to do it because K11 ECU its very similar to S14a ECU. Do you have MSN? Thanks
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#12 (permalink) Old 07-11-2009, 09:42 PM
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Do you have any schematic of your GA16DE prototype board?

Its possible to make an SR20DE ECU to work with K11?

Best regards
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