difference in ODB's
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Member
Joined: Jul 2003
Posts: 45
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From: Maryland
difference in ODB's
I a little confused what exactly the differences are in all the ODB's. I understand in 92 pretty much everything went to ODB1 and then in 96 to ODB2. But other than a stupid diagnostics port under the dash and an extra o2 sensor on ODB2 what's the difference. Everything should be in the ECU. I keep hearing that you can't use an ODB2 engine in an old car unless you have everything ODB2. I can't see what possible difference it would make if you dropped in a D16Y8 into a D16Z6 car other than maybe the distributor. Far as I know the ECU wouldn't know any difference and everything should run fine. I have a 90 CRX with a D15b2 and plan on doing a very mildly built "mini-me" with the D15b2 block and Y8 head with a D16Z6 ecu and odb0 to odb1 conversion harness but really couldn't understand what the difference was and why I would even need to get a conversion harness as long as everything is pinned out properly on the the wiring harness and connectors.
Thanks,
Bruce
Thanks,
Bruce
Senior Member
Joined: Jul 2002
Posts: 131
Likes: 0
From: Northern Cali
The OBD thing basically has to do with keeping the air you and I breathe clean. There are a lot more differences between the different OBD's than many people think. I will elaborate more on OBDI and OBDII. The difference between the two is that ObdII is more advance in what the ECU can do. The ecu has incorporated testing parameters to test every emissions system on the car before the car is started and while it's cruising down the highway and the driver doesn't even notice it happening. When it finds that something is not working right it throws a check engine light (MIL). OBDI never had this and if there was something wrong with any emissions system the driver never know something was wrong with the car. All the little things add up to a big problem as time goes by.
Now concerning motor swaps, the law states that the donor engine must be the same year or newer. The reason being is that manufacturers are constantly changing head design, cam profiles, intake and exhaust port flow charateristics, etc... to increase efficiency and to reduce emissions. So newer engines are considered to be better in reducing emissions. Although a B16 head from 1990 may look identical to one from 2000, the newer head is by far better.
Now concerning motor swaps, the law states that the donor engine must be the same year or newer. The reason being is that manufacturers are constantly changing head design, cam profiles, intake and exhaust port flow charateristics, etc... to increase efficiency and to reduce emissions. So newer engines are considered to be better in reducing emissions. Although a B16 head from 1990 may look identical to one from 2000, the newer head is by far better.
