ST185 JDM ECU Identification

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ST185 JDM ECU Identification

Postby cmonteiro1 » Sun Jun 03, 2007 3:43 am

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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Postby Gary » Sun Jun 03, 2007 11:10 am

What is the part number?
93 ST185
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Postby cmonteiro1 » Sun Jun 03, 2007 4:05 pm

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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Postby Conan » Sun Jun 03, 2007 4:37 pm

It's an early (90-91) JDM unit.
When in doubt - increase boost.
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Postby cmonteiro1 » Sun Jun 03, 2007 4:46 pm

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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Postby Conan » Sun Jun 03, 2007 5:21 pm

cmonteiro1 wrote:What are the pros and cons of using this ECU instead of the stock 91 ST185 ECU

+ a little more power when using proper fuel
- detonation under boost with lower octane
When in doubt - increase boost.
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Postby cmonteiro1 » Sun Jun 03, 2007 6:18 pm

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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Postby cmonteiro1 » Sun Jun 03, 2007 6:19 pm

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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Postby therealmusashi » Sun Sep 16, 2007 7:50 pm

Man, I would love for someone knowledgable to answer this question...I'm in the same position as the orig. poster.
91 ST185 (205 swap, ATS GT3071)
2008 Subaru Legacy B4 (daily driver)
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92 MR2 turbo (ATS 2.2L stroker, GT3076) - Sold
85 MR2 Mk1 - RIP
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Postby saki10man » Sun Nov 04, 2007 7:04 pm

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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Postby tw2 » Sun Nov 04, 2007 11:49 pm

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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Postby WarTowels » Sat Dec 15, 2007 7:24 am

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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Postby d1alltrac » Sat Dec 15, 2007 9:10 am

WarTowels wrote: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


I've done the same thing. :lol:
Patrick R.

88 ST165 x2
92 MR2 turbo
02 330i
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Postby Corey » Sat Dec 15, 2007 3:23 pm

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.


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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Postby BriinumsBo » Tue Dec 18, 2007 11:49 am

so this early JDM ECU, can it be run without the AFM? im thinking wether i should buy this..
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