vinhisbored

i'm planning on doing a 5 speed swap on my car, as many have maybe read on a thread about a week ago. anyhow, my car's a 98, and i bought a complete swap package from a 95. my question is about the ecu about it. which ecu should i use? the stock auto 98 one, or the manual 95 one? my friend that did a swap on his car told me that i could use the 98 auto one, and that there would be no problem what so ever using it, but which one would be better to use? we're not too good w/ the electrical work, and how one is OBDI and the other is OBDII. i've looked up on websites about the electrical wiring, and it seems/sounds quite complicated. but anyhow, what do you people think? is my friend right, and should i just not worry about the 95 one, and keep the 98 one? please let me know.

Phlip

I don't know about the 98 ECU and OBDII, I swapped a 95 engine into my 89 and used a 92 5-speed ECU... My understanding is that you CAN use the 98 ECU, but the car will idle higher than normal and, according to DriftFreaq, wil present (if only slightly) a performance gain over using the 5-speed ECU.

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vinhisbored

so do you think i should use the 98 auto one or the 95 manual one? as you stated in there, i guess it's idling sort of high, or a 'small' (if any) performance gain with the auto 98 one? i just want my car running smoother.. that's all..

Phlip

"smooth" running, I would think it would be the 95 ECU, but I dunno what that would do for you and OBDII, or given OBDII if you would be able to do that at all... IF you don't mind the 1500-1800RPM idle, you would be able to use the 98 ECU, it is all a matter of your personal opinion, and I am not sure if it will work with the 95 ECU given your OBD crap, my car is an 89 with a 95 engine, all I gotta do is pass the sniffer and have working lights to pass an inspection here in NC.

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jdm538

the 95 ecu is different it is OBDI layout, i hope you got a OBDII tranny (96-98) because if not you will luck out on the crank pos sensor your check engine light will be on. i used a auto ecu on my 98 for a while until i found a 97 manual ecu.

Phlip

^^^ And there is an answer from someone doing more what you are doing, taken into comparison to my own

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vinhisbored

so jdm538, you're saying that i should just use the auto 98 ecu in the meantime, until i purchase a 98 manual one?

d4vech3n

I still use my 97 auto. Didn't find it necessary that I swap to OBII manual. Idles arent at 1500 - 1800, maybe for the first two seconds you start the car but otherwise it sits at 900 or so. When it's cold, it will sit at 1200 for a while until the engine warms up. When the weather is really warm, you'll have to tap the gas slightly when you start your car or i'll turn off. If you're ok with that then you can keep the auto ECU which doesn't have a speed governor, not that you should be speeding; tickets are a killer. I took the check engine light out but plan on putting it back in when I swap to an SR. It gets annoying seeing it on, just diagnose your ecu and now and then to check up on it.

Phlip

I was referencing this:
http://www.zilvia.net/f/showthread.php?t=74615
... in reference to the idle thing

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jdm538

i would just stick with the auto ecu till you find a manual one

drift freaq

ok here is the deal , there is a slight chance the 95 manual ecu could be OBDI depending on how early in 95 the car it was on came out. Nissan did the switch in 95 from OBDI to OBDII . Thing is if you use a OBDI ecu on a OBDII car your seriously gonna be assed out in the smog department as in they will fail you.
Using the 98 auto ecu can be done but not so much the idle issue is the real issue at hand here is the fact that 98 is OBDII which is a lot pickier system.
That means the computer is looking for that auto trans when it does not see it will throw code and turn on your check engine light again your car will run fine but if you try to smog it it will be an automatic fail. Smog techs are instructed to fail the car if the check engine light is on and the smog computer will fail the car if its throwing code.
If you have a 98 your gonna have to find yourself a 97-98 5 speed ecu plain and simple. Sorry you do not have the freedom that S13 owners (OBDI) have. Thats what you get for wishing to own a newer car you have to live with the consequences.

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ghostuss

gosh man. Stop scaring the guy. ECU is a dime a dozen, don't even trip on it. Really Drift Freaq. couldn't have put it better. OBDII sucks big time man, I have a 96 and I have both OBDI and II. I was told that Nissan just slap on a OBDII system to this OBDI car for my 96 240sx.(my car is actually made in late 95 and sold in 96) 97-98 is built with the OBDII in it. anyways, better do it right. You can always sell that 95 ECU.

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