doom26464

ok so I did some reading and searching and tearing things apart. for 1 my car v-tec engages at 4,800rpm. I always though the gen 1 b16 was at 5,500 rpms. also not having any 02 sensor what so ever makes me wonder about the car.

So here is what I have so far. I was thinking mabye the ecu is chipped but I have no idea of how to tell if it is or not. The ecu is a PR3-J00 ecu wich as far as my knowledge and searching is that its the ecu out of the JDM 92 integra XSi(89-91 jdm integra ecu was just a PR3 where the 92 uses a PR3-j00).
here are some pics(not very clear camera suxs)





now also I seem to find alot of mixed info on this ecu. Some say its a OBD-1 and some say its OBD-0. I think the 92 integra in japan switched to obd-1(anyone can confirm this??).

Also I have no idea what wire coour is for the o2 sensor. I did find these 2 snipped wires and this green plug sitting here though:



Also one other thing the head is stamped PR3-3 wich is it possible the head is a type R head?


sorry for all the random questions but there so much back and forth misinformation on the net about this and I need some honda gurus to help confirm this or diagnose this.

MIGPA26

i have a 91 hatch with a 1st gen b16a1 swap running a PR3 ecu. Im being told its obdo ecu.

Dc4iNtEgRa

Thats a OBD-0 computer... It has a the Green plug that goes to the harness. Chipped? I can't tell... OBD-0 ecu's have the "mother board" where yours has the secondary board on top of it... I gotta check my ecu's and I will get back... I could be wrong though... Alex


EDIT: I was talking about the green plug with the sticker on the ECU...


Modified by Dc4iNtEgRa at 5:40 PM 6/15/2008

GreedyPT

Your PR3 is still virgin, so dont worry

The stock VTEC engagement point is at 4800rpm in oposition to the usual 5300rpm of the non JDM ones.

The daugther board is the knock board, quite needed on that ECU due to the more agressive ignition maps (28.44º @WOT from 7400rpm up vs 25.40º on the same range)

The green plug is for one of the stock O2 sensors, I can tell you what the wire is tomorrow. (kinda late and dark to go outside and check it)

About the head, all VTEC B-series head (Apart from the GSR one) were PR3-something, so i wouldnt count on a ITR head there. )

doom26464

so the pr3-j00 has much more advance timing?

anyways im running with no o2 then if its not chipped but its not throwing any codes and runs fine...how is that??

GreedyPT

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doom26464 &raquo;</TD></TR><TR><TD CLASS="quote">so the pr3-j00 has much more advance timing?

anyways im running with no o2 then if its not chipped but its not throwing any codes and runs fine...how is that??</TD></TR></TABLE>

Yap, the JDM ECUs have an average of +3º advance on the VTEC tables.

About the no O2 sensor and no cel code, it also beats me. Both my previous EE9 as my current one also ran with no sensor connected and never threw a code.

MIGPA26

I have a PR3 and I actually have 2 senosr on my header.

GreedyPT

All OBD0 ECU have 2 single wire O2 sensors.

MIGPA26

then how come can some run a car with no o2 sensors?

doom26464

wierd how that car is still able to run though without it. It smells very rich though under v-tec. any idea where to buy new ones and how to wire them in.