ECU question

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ECU question

Postby Boosted3s » Sat Dec 18, 2004 6:08 am

Just a quick question here. Is there a performance benefit in swapping my stock 2nd gen ecu for a JDM 2nd gen ecu? I have one available for free if it is any better. Thanks
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Postby sardgt4 » Sat Dec 18, 2004 6:29 am

I hear it has a more agressive timing on it. My friend claims his was faster with the JDM ecu but he blew his motor so dont know what to tell you. The only thing I can tell you to make sure of is 90-91 share the same ecu pinouts and 92-93 are the same too. You cant interchange between the two without rewiring. Its not just one or two wires either, theyre much different.

Good luck,

John So 92 st185
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Postby 92 All-Trac » Wed Dec 29, 2004 5:31 pm

If you run the JDM ECU just make sure you are running much higher octane than you get from a US pump. Like stated above, the timing is more advanced on the JDM ECU and if you don't have your car running the right fuel you're going to get some nasty detonation.
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Postby etantshi » Fri Dec 31, 2004 12:06 am

I've tested both and to be honest there was not much "butt dyno" performance difference between either of them. You can do it for the mod list though if you want.
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Postby alltracman78 » Fri Dec 31, 2004 12:10 am

92 All-Trac wrote:If you run the JDM ECU just make sure you are running much higher octane than you get from a US pump. Like stated above, the timing is more advanced on the JDM ECU and if you don't have your car running the right fuel you're going to get some nasty detonation.


I dunno on that. Japan uses a different system to rate it's octane. Their 98 is like 94 over here. You shouldn't have any problems running 93 on a JDM ecu.
Hell, people have run a JDM ecu on 91 in Ca, with only a loss of power.
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Postby 92 All-Trac » Fri Dec 31, 2004 5:29 pm

alltracman78 wrote:
92 All-Trac wrote:If you run the JDM ECU just make sure you are running much higher octane than you get from a US pump. Like stated above, the timing is more advanced on the JDM ECU and if you don't have your car running the right fuel you're going to get some nasty detonation.


I dunno on that. Japan uses a different system to rate it's octane. Their 98 is like 94 over here. You shouldn't have any problems running 93 on a JDM ecu.
Hell, people have run a JDM ecu on 91 in Ca, with only a loss of power.


That's probably true, but until I see some kind of factual evidense I would play the safe side. It's not worth the risk of seriously damaging your engine from possible detonation.
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Postby alltracman78 » Fri Dec 31, 2004 5:45 pm

Japan uses RON, the US uses RON+MON/2. It gives you different #s. RON is a higher [and I believe more accurate] #
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Postby Mafix » Fri Dec 31, 2004 8:46 pm

i have and have been running a JDM ECU. i can't use anythign but high octane 93 or better but it works great. but dyno says better.
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