2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Just an old member looking for a quick answer.

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Old 09-29-09, 07:09 PM
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Just an old member looking for a quick answer.

So, I did a t2 swap in my 90 gxl, figured everything out, just runs wierd when it fires off...running off a n350 ecu...

I have the jdm t2 harness and motor (s5)

Someone called me and I never got his name, but he told me to get a chipped n370 ecu and that will cure the issue...

see heres the thing, i dont remember if he said n374 or n370...but I know it needs to be chipped for sure, who can clear this up for me.
Old 09-29-09, 07:43 PM
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N370 is the US S5 TII ECU, which will plug in and work just fine.

N374 is a Japanese S5 turbo ECU, which must be chipped or it will not fire the injectors properly.

You should also never run a turbo engine on an NA ECU like the N350. It's a good way to blow the engine under boost.
Old 09-29-09, 08:04 PM
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yeah, I know that much, but its a jdm motor and harness. So i was thinking 374 chipped? or would the 370 work with the jdm harness?
Old 09-29-09, 08:59 PM
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The N370 will work on your JDM harness.

The N374 will probably NOT work unless it is chipped.
Old 09-29-09, 09:15 PM
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k, cool, I got a non chipped 374 but it wouldnt fire off with it. Thats why Ive been running it on the 350 for testing.

so a n370 it is i presume. I hope.
Old 09-29-09, 09:16 PM
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The problems that occur with the N374 J-spec ECU seem to be with the US-spec front harness connection, so whether the emissions harness is US or J-spec doesn't seem to matter.
Old 09-30-09, 04:38 PM
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aww okay. thanks alot =]

Oh yeah, what about chipped n370s?
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