Hey guys

I have 90 ef hatch w/ a b16a1 and I have read that certain people with OBD0 b16's, like mine, are having problems bogging out in early rpms at low throttle and I happen to be one of them. I understand that this can be fixed by converting to OBD1, and I also hear that if you are going forced induction OBD1 is superior because of the tuning options.

Is this true?

Also, I know what is needed for the conversion but I have a question concerning the O2 sensor situation. From what I understand the PR3 OBD0 B16A1's have 2 O2 sensors, one in the exhaust manifold and the other is in the cat I believe ( I could be wrong). I also read that the OBD1 motors/ecu only run on a single 4 wire O2 sensor (please correct me if I am wrong. Btw I plan on using a p28 chipped for neptune). My main concern with this matter is where does the single 4 wire O2 sensor go and if there is 2 spots for O2 sensors how do I go about plugging up the other hole?

Thanks all for any input and your help is greatly appreciated.

 

You have your information correct other than o2 sensor location. Someone correct me if I'm wrong, but the two o2 sensors on the b16 are like 1/8" from each other (at least that's how they are on my car). To convert to obd1 you do indeed need to convert to a 4-wire o2 sensor, basically any obd1 honda o2 sensor will work (I believe). You need to use a different header when you convert over to obd1. The new o2 sensor needs to read from all 4 cylinders, so your best bet would be either an integra LS header or a del-sol VTec header. I don't know if the 92-93 LS header will bolt up, but from 92 and up, they have the o2 bung at the end. I believe the 94+ LS bolts right up, and the o2 sensor bung is at the end of the header where all 4 cylinders meet. The delsol VTec should bolt up, but may be hearder to find an oem one (if you want to ref). You may be able to pass ref with a carb legal delsol VTec one though. If you do decide to use your stock b16 header, I guess in theory, you would need to either get plugs (bolts like the ones that come on aftermarket high flow GSR cats) and then re-drill a hole for the new o2 sensor at the end of the header before the cat. I hope I got everything. Lmk if you need me to explain something more.

Here's a pic of my b16. In red are the wires going to the o2 sensors. I would get a better pic if I could, but you can clearly see the wires going towards the header.


And here's a pic of the LS header. Notice where the o2 bung is?

 

Try switching your O2 sensor wires. The one on the stock harness will only plug into the wrong one on the engine, leading to alot of people hooking up the O2 sensors backwards and having bogging/stuttering problems at partial throttle. Switching the wires will be alot easier than going to OBD1.

 

[QUOTE=denraweb]You have your information correct other than o2 sensor location. Someone correct me if I'm wrong, but the two o2 sensors on the b16 are like 1/8" from each other (at least that's how they are on my car). To convert to obd1 you do indeed need to convert to a 4-wire o2 sensor, basically any obd1 honda o2 sensor will work (I believe). You need to use a different header when you convert over to obd1. The new o2 sensor needs to read from all 4 cylinders, so your best bet would be either an integra LS header or a del-sol VTec header.QUOTE]

Thanks alot for the info. I currently have an ITR header attached to my b16, will that work fine?