SimbaDogg

as the topic states...will a OBD I ecu work w/ an OBD 2 dizzy? i'm getting a brand new OBD 2 dizzy w/ my ITR head, and i just wanted to know if it would work cuz i'm gonna run a p30 ecu

Turbogixxer

Yes, it will. you will have to rewire the connector if you have a OBD1 engine harness.

ph8ed4life

search for the conversion chart that poison put on here. I found that very helpful

Maintenance

https://honda-tech.com/zerothread?id=723801

Newman

OBD-2 electronics = OBD-1 electronics

They just use different plugs for the most part.

GTlvr82

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Newman &raquo;</TD></TR><TR><TD CLASS="quote">OBD-2 electronics = OBD-1 electronics

They just use different plugs for the most part.</TD></TR></TABLE>
SO what if you have a obd2 harness running an obd2 dizzy on an obd1 computer....what about THAT....I figure the only thing I can do to keep from wiring myself to death is to get a obd1 harness...true?

Katman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GTlvr82 &raquo;</TD></TR><TR><TD CLASS="quote">
SO what if you have a obd2 harness running an obd2 dizzy on an obd1 computer....what about THAT....I figure the only thing I can do to keep from wiring myself to death is to get a obd1 harness...true?</TD></TR></TABLE>

it will work.
OBD1 & OBD2 electronics, as far as the distributor & ecu's go, are forward & backwards compatible.

BlueTeg

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Katman &raquo;</TD></TR><TR><TD CLASS="quote">
OBD1 & OBD2 electronics, as far as the distributor & ecu's go, are forward & backwards compatible.</TD></TR></TABLE>

So what components are not compatible?

I'm assembling a GSR head to put on my B20z and I have already bought an obd1 p72 ecu and 1998 GSR head (minus the dist, IM, and TB)
1.) From what you said, I would be okay with either and OBD1 or OBD2 distributor from a GSR?
2.) What about the TB and IM? I assume that these are not interchangeable between OBD versions and that I would need an OBD1 GSR TB and IM to match up to my obd1 ecu?

Turbogixxer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueTeg &raquo;</TD></TR><TR><TD CLASS="quote">I'm assembling a GSR head to put on my B20z and I have already bought an obd1 p72 ecu and 1998 GSR head (minus the dist, IM, and TB)
1.) From what you said, I would be okay with either and OBD1 or OBD2 distributor from a GSR?</TD></TR></TABLE>

A B-series Vtec (OBD1/2) will bolt right on. If your car is OBD1 (the harness) and you buy a OBD2 dizzy, you will have to rewire it to run the OBD1 style pulgs (and the other way around). You can use a LS dizzy (OBD1/2), but you have to cut one of the legs off.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueTeg &raquo;</TD></TR><TR><TD CLASS="quote">
2.) What about the TB and IM? I assume that these are not interchangeable between OBD versions and that I would need an OBD1 GSR TB and IM to match up to my obd1 ecu?</TD></TR></TABLE>

Yes, they are. You may have to do some rewiring (it matters what car/harness you have), but the major sensor will work (map, tps, etc. Not IACV, it ranges the year, car, OBD, trim).