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Old 02-21-2001, 10:43 PM   #1
markus
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Question JDM ECU for EJ20 (Yes I have done a search)

It has been suggested to me that the JDM ECU will not require any modification (other than wiring harness) as it relates to North American petrol since the Subie ECU's would simply learn to adjust (i.e. retard the timing) to account for the lower octane.

Does anyone in North America with an EJ20 swap & JDM ECU in their car have some real-world experiences to share?

Curious.
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Old 02-22-2001, 12:05 AM   #2
go go go
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I don't have that set up in my car but I know that JDM ECU detects the octane rating and if it's a Regular gas (below 96), the ECU goes into "safe mode" which limits the boost to 0.5 kg/cm2.
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Old 02-22-2001, 09:54 PM   #3
markus
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So are you basically saying that to reach the full potential of a JDM EJ20 motor, you have to get rid of the JDM ECU? Certainly sounds like it.
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Old 02-22-2001, 10:02 PM   #4
GTBGUY
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Markus - yeah the JDM ECU's are tuned for HI-Octane fuel... even the highest I've seen (94octane) isn't good enough. I tried this on a Spoon Sports engine that I installed into an EK9 Civic, we were running the JDM CTR's ECU... didn't like the 92 octane, retarded timing quite a bit. It'd be easier to add piggybacks or another stand alone ECU than to use a JDM one. (Unless you'll be running on 104 unleaded race fuel all the time)
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Old 02-22-2001, 10:04 PM   #5
markus
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Thanks for the info guys. I was afraid of that.
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Old 02-22-2001, 10:05 PM   #6
Ver.III
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I have been running my V3 in my car for almost 2yrs and 50,000 km of abusive auto-x, rally-x and quite a few drivex events. I normally run Sunoco Ultra 94 (equal to 98 in Japan)or Esso 92 with a little of Klotz octane boost and have had no problems. I am running 18psi of boost full time. The engine comes stock with a knock sensor, so there is a safety in place. This is one topic I think that gets over exagerated. I say speak with others who have these engines in their cars and see what they say.

Rich

" Drive it like you hate it ! "



[This message has been edited by Ver.III (edited February 22, 2001).]
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Old 02-23-2001, 10:42 PM   #7
markus
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Ver.III,

Where are you from? I hear lower mainland area but also Toronto. Would like to have a chance to chat with you about this sometime.

Cheers,
MB
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Old 02-23-2001, 10:49 PM   #8
Ver.III
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Markus,
I am from Toronto. Actually, I will be in Calgary mid-may for the Bighorn and Rocky Mountain rally, part of the Subaru Canadian Rally Championship.

Rich
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Old 02-24-2001, 11:59 AM   #9
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Of course you can also just chip the ECU which wil enhance performance and get rid of that octane problem. I believe rechipping it runs around $1000 Canadian. Call (416) 781-1179 and speak to Yoshio. Tell him I sent you. He can help you with your ECU problem. Just be patient as he has a thick Japanese accent. If you speak Japanese, speak to him in Japanese. It's easier.
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Old 02-25-2001, 01:48 AM   #10
cvalle-sd
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PS- don't underestimate the effect of one or two octane points - 2 or three doesn't seem like a lot, but think of it like drug dosage; a few miligrams either way can make a huge difference. I don't think of 87 octane representing 87 - think of it as 1, with 92 being 5, so if the JDM ECU needs a US 94 (7, lets say) - you really can't give it 5 and get any kind of reasonable operation. I live where we can't even get 94 octane - sigh.
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