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ECU option

 
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Old 06-13-2012, 03:19 AM
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ECU option

well I've been researching parts and such ill need for boost and what not and i stumbled across this Chipped OBD0 ECU i was thinking i need to do a OBD0>OBD1 conversion. So my real question is will this be a safe/cost effective purchase towards my boost build? and y'all think id be able to get it tuned as any other method of tuning goes...
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Old 06-26-2012, 12:15 PM
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Re: ECU option

All I know is the B20 is OBD0 and the B21 is OBD1.The B20 computer says PK2 and the B21 says PK3. Even in 1991.Also the connectors are completely different and don't interchange.Don't know which engine you're trying to boost.
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Old 06-26-2012, 05:33 PM
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Re: ECU option

Go stand alone:

Megasquirt FTW!
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Old 06-27-2012, 01:19 AM
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Re: ECU option

umm id like not to spend as much on a ecu as i did on the car... pre-89 are obd0, 90+ are obd1, so they use different harnesses. one reason i looked into the obd0>obd1 conversion harness. but now since i found a tune-able obd0 ecu i am going that route. if i go megasquirt itll be in my s10 with a rb25 swap...
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1BadBB6 has one. We never play with it anymore though.
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Old 06-27-2012, 07:25 AM
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Re: ECU option

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Originally Posted by Stancil1216 View Post
umm id like not to spend as much on a ecu as i did on the car... pre-89 are obd0, 90+ are obd1, so they use different harnesses. one reason i looked into the obd0>obd1 conversion harness. but now since i found a tune-able obd0 ecu i am going that route. if i go megasquirt itll be in my s10 with a rb25 swap...
This is incorrect!

88-90 2.0S = PGM-CARB
88-89 2.0Si = OBD0
90-91 2.0Si = OBD0
90-91 Si = OBD1

mmkay?
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Old 06-27-2012, 10:21 AM
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Re: ECU option

I remember reading about a tunable ecu for obd0 about a year ago. I was thinking about buying one. I can't remember what now, but there was something about it that wouldn't work for us without changing something. Sorry for being so vague but my memory isn't what it used to be. Hell, now I'm gonna have to search the other forum to see if I can find it.

Edit:
I remembered something about what I was reading last year. obd0 doesn't use a 4 wire O2 sensor, so there is no way to connect a wideband O2 sensor for tuning. I don't know much about tuning, but it made sense to me when I read it. Check with your tuner before buying this, and make sure he can do a good tune for you on this ecu.
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Last edited by luzer; 06-27-2012 at 11:05 AM. Reason: Remembered something
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Old 06-27-2012, 08:57 PM
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Re: ECU option

If you have an LC-1 wideband, you can tune the wideband O2 sensor output to whatever you want to use. However, a wideband would not be a plug-n-play with an OBD0 ECU, probably not ever. I mean, you would at least need the LC-1 to convert the voltage signal.

Actually, the hurdle is not with the OBD0 ECU, it is with the tuner. Most tuners are not very familiar with OBD0, and even less familiar with the B20a5 or B21a1.

If you heard a tuner complain about the OBD0 O2 sensor setup, it would pretty much have a lot to do with the situation. However, it is more complicated than that. Datalogging can be performed via numerous methods, based on different equipment, and even live from an ECU if supported. The hardware and software is present, the widespread knowledge is not.

Last edited by TripleLude; 06-27-2012 at 09:01 PM.
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Old 06-29-2012, 02:14 AM
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Re: ECU option

you can do a dual o2>single o2 conversion just got to get a 4 wire o2 and take both signal wires and twig them together, there's how to on prelude3g.com
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