ST185 JDM ECU Identification

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cmonteiro1

New member
I got my hands on what I think is a JDM ECU. Could some one tell me how I can identify whether or not it is or not. Also, what improvements should I see with the JDM ECU of the stock US ST185 and is there anything I need to worry about.
 
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cmonteiro1

New member
There are several numbers on the ECU. They are all listed below.

*1750003910Q*

89661-20751

17500-3910 12V

Thank you for all of your help.
 
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cmonteiro1

New member
Thank you very much. What are the pros and cons of using this ECU instead of the stock 91 ST185 ECU.

Thanks again.
 
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Conan

New member
cmonteiro1":3leg7f5o said:
What are the pros and cons of using this ECU instead of the stock 91 ST185 ECU
Click to expand...
+ a little more power when using proper fuel
- detonation under boost with lower octane
 
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cmonteiro1

New member
Thanks again for the input. What octane is appropriate. Right now I use whatever the highest at your typical gas station is, 91 I think. I'm pretty sure this is standard for alltracs. If I should be using higher octane, where do I get it, I've always considered those octane boosters to be a gimick, but is that something I need to consider? Thanks again for any input. It is always very helpful.
 
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cmonteiro1

New member
Thanks again for the input. What octane is appropriate. Right now I use whatever the highest at your typical gas station is, 91 I think. I'm pretty sure this is standard for alltracs. If I should be using higher octane, where do I get it, I've always considered those octane boosters to be a gimick, but is that something I need to consider? Thanks again for any input. It is always very helpful.
 
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saki10man

New member
consider doing a google search for race fuel in your area, you may be able to get 100 octane or 107 octane depending on the area. Try to get it unleaded if possible, but leaded wont hurt just slow down the o2 sensor response. I wouldnt do more than a half tank and also pull your 15 amp EFI fuse when you put the gas in so that your ECU can re-learn on the new gas. Also keep in mind the gas is expensive and you will have to put it in a gas can. You cannot put race fuel directly into a street vehicle at least not in my area. Hope this helps 8)
 
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tw2

New member
I have a JDM gt4 and I use 98 RON whatever that is equivalent to (94 MON?) and I would not use less than that. Even 95 and it doesn't appear to run as nicely.
 
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WarTowels

Active member
I'm paranoid, and refuse to use anything other than 93+ Octane on my US ECU 185.

One time I had to ask for a refund at a gas station cause I assumed they had 93, prepaid, then got out and they only had 91. :lol:

Haha, I got some weird looks from the help.

-Towels
 
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d1alltrac

Active member
WarTowels":ijkt4b6w said:
I'm paranoid, and refuse to use anything other than 93+ Octane on my US ECU 185.

One time I had to ask for a refund at a gas station cause I assumed they had 93, prepaid, then got out and they only had 91. :lol:

Haha, I got some weird looks from the help.

-Towels
Click to expand...

I've done the same thing. :lol:
 
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Corey

Active member
I have a JDM gt4 and I use 98 RON whatever that is equivalent to (94 MON?) and I would not use less than that. Even 95 and it doesn't appear to run as nicely.
Click to expand...

I read on wiki that you can estimate the PON value (R+M/2) by taking about 4 units from the RON number. So 98 Ron should be roughly 94 PON right?

Anyway, thats what i use also.
 
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Heytheremr2

New member
What 3SGTE ecu is part number # 89661-2B280?

I assumed it was for an MR2, since it came with my car when I bought it but when I posted it up fs on the MR2Board, Someone suggested it's for a Celica. I inputted the part # on Lithiatoyotaparts' website, but nothing popped up. It's also a different part # than my 93 JDM 3SGTE currently in my MR2.
 
Gary ST165

Gary ST165

New member
Heytheremr2":2882qzhl said:
What 3SGTE ecu is part number # 89661-2B280?
Click to expand...


have you tried google the 10 digit part number ? :89661-2B280 :)


or maybe on this board: search.php?st=0&sk=t&sd=d&sr=posts&keywords=89661

read viewtopic.php?f=20&t=39301


UK ST185
89661-20770=89/10-91/08
89661-2b320=91/08-92/02
89661-2b300=92/02-93/11

JDM ST185
89661-20750=89/10-90/03(superceeded to 20751)
89661-20751=90/03-91/08
89661-2b310=91/08-92/02
89661-2b280=91/08-93/09

UK ST205
89661-2b850

JDM ST205 ecu
89661-2b841=94/02-95/03
there was a 89661-2b840n but this has been superceeded by the above jap number.



hth
 
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