Following on from the thread
http://www.scoobynet.co.uk/bbs/thread.asp?ThreadID=289524&ForumName=Drivetrain&Fo rumID=11


I thought I would break away from the above and try to pool some resource / gleen some info, in order to try an get a MY97/98 ECU adaptor for an External ROM/ReMap off the ground.

As mentioned in the thread above. I do not intend to do any MY97/98 mapping, but would like to get the info out into the public domain.

David has the schematic capture facility and we have contacts that can make up PCB's for an MY97/98 ECU adaptor. We just need to get a few things clarrified before gerber files can be sent to PCB manufacturers.

A MY97/98 ECU image and it's map locations has also been sourced/decoded. So the only thing preventing the go ahead are the fine details of the ECU adaptor.

I currently have the following H/W details if anybody wants to add to it :

Info for running External Map on an MY97/98

Jumper pattern (on underside of ECU):

J902:J903:J904:J905
OPEN:SHORT:OPEN:SHORT - Normal Mode
SHORT:OPEN:SHORT:OPEN - Outside ROM


Headers for connection of External ROM

terminal W100 (bus)
1 VCC
2 A0
3 A1
4 A2
5 A3
6 A4
7 A5
8 A6
9 A7
10 A8
11 A9
12 A10
13 A11
14 A12
15 A13
16 A14
17 A15
18 A16
19 D0
20 D1
21 D2
22 D3
23 D4
24 D5
25 D6
26 D7
27 D8
28 D9
29 D10
30 D11
31 D12
32 D13
33 D14
34 D15
35 ?
36 VCC
37 VCC
38 GND
39 GND
40 GND

W110 (control)
1 R/W
2 /E
3 /BHE
4 ?
5 ?
6 ?
7 ?
8 RxD2
9 ?
10 ?


[Edited by Scott.T - 1/13/2004 10:39:28 AM]

 

I guess the above information is from one of the Japanese Legacy sites, it looks like a BG5A ECU, this is different from the UK/Euro Impreza and STi V3/4 ECUs, the pinout on the address/data connector W100 on your picture W110 on a UK ECU.

I believe the info on my website is more accurate for the cars we see in this country than the info on the Jap sites which are for one of the earlier iterations of the 97/98 ECU.

As I have said before, there is more to this than meets the eye.

Andrew...

 

Scott,

Andrew has something of interest of mine. He/we concluded that there are more things going on than we know. however, how much of the pinout is there for external feeds to the ASICS I don't know. Perhaps for a minimal rom board not all the connections are required.

Looking at the pinouts on a 97 impreza ecu, certainly all of what you have listed is there, and can be mostly found.

Given that you can get a microtech for very little money, I would go that direction. Also for £900 the mappable ECU from TEG is a very nice proposition.

My problem with it is can I afford the time, which impacts me directly financially, to develop something that we can knock out for £100 like a scoobyecu.

oh, the resistors pictured above are wrongly labelled due to ECU type, but thy are easily found on impreza ECU and have same layout.

Paul


[Edited by Pavlo - 1/13/2004 11:42:53 AM]

 

The time and money thing is exactly the same for me, which is why I snapped up a s/h Link when one came up.

Andrew...

 

Sourced from here http://lillith.sk.tsukuba.ac.jp/~kas...aru/bg-at.html

As it talks about ECU part 2, I thought is was a step forward from the Pre96 Impreza ECU.

I will hopefully be looking at a Prodrive ECU soon, so I will buzz through to see what's what.

[Edited by Scott.T - 1/13/2004 12:15:28 PM]

 

I would of thought people would be willing to pay more than that for one.

 

True. I think a 'Superchip' is 3x this price and it isn't really a remap AFAIK

 

Yep, I'd say £4-500 or so including custom mapping?

 

perhaps, but where do you draw the line?

I would like to do it, and maybe there will be plenty of time later in the year depending on jobs etc.

paul

 

Not sure where you draw the line Paul but I think you need to pitch it around/just under the current market prices for comparable products.
At the moment you guys are waaaaay too cheap ! I'm sure the 97/98 boys would be willing to pay a bit more than £100 in order to help fund any development costs.

How about a group buy of 20 minimum at £250 each ? Would the additional £3k tempt someone to devote more expert time to it (assuming that is what's required ?)

Andy

 

Good idea, but hardware development costs are one thing - what about the map itself? After all, that's the whole point of the exercise! That price couldn't include a custom mapping I wouldn't have thought

 

I know this is happening at the moment...

if there is interest I will point someone this way..

Start a thread and express an interest..

David

 

My experiences are that you would need to do about 4 cars to come up with a universal, conservative map that suits 90% of the people.

I am always reviewing the situation. If it came to it a Mines rom board could probably be copied as they are rarely scrambled. But then there is the issue of further decoding of the ECU maps. While TEG have done it, they took many months just for that. I have found the ignition, fuel, boost, idle maps and a few other things, but not injector scaling for instance. SO that kinda limits things for now. Getting a rom emulator(s) would help and I have identified a suitable setup for live mapping that would also allow me to write custom software for the emulator. Emulator is also available relatively cheaply, and mor eimportantly can be setup for 2x eproms.

As for scoobyecu being too cheap. you may be right. but for the 90% of cars for which it's an instant fix, it's about right. the 10% of cars that require more work are a pain, to which there is no easy solution except a custom remap for more money.

I would hope that there can be further options later this year, and no doubt interesting things will come to pass.

Paul

 

jlanng,

hardware will be circa £250 fitted my reckoning.. custom mapping circa 400 - 500 Generic mapping as per scooby ecu.. £100? 350 - 400??

sounds ok to me..

David

 

Edited due to being too slow to post in the right place.

MB

[Edited by Dark Blue Mark - 1/13/2004 4:23:15 PM]

 

All sounds reasonable David

 

Scott,

As I said, that information relates to a Legacy specific ECU that was basically an earlier version of the MY97/98, V3/4 ECU.

If the Prodrive ECU is a PPP one then they look exactly like the std ECU, but the MCU is blown with a different map.

Things get harder in that JECS used custom versions of the 7700 MCU for which there are no publically available datasheets.

Andrew...

 

Mines style adaptor it is then.

ANYONE GOT A MINES ????

 

Not on a UK car

Andrew...

 

I don't think that will make a difference andrew. only the maps would be differnent, whether they link up with immobiliser hardware I don't know.

Paul

 

BTTT
I'm willing to help development - even though im not exactly the best at all this.
I do have a car for guinepig-ing (sp?) tho ...

Steve