janz3n

i want to put a obd1 d15b into my hatch in the future but i just need some info on changing obd2 to obd1 to put it in. what all do i have to change to put it in? i know i need a conversion harness but is that just for the ecu? any help would be great, any links would be great. iv done engine swaps before but they were all on ef's with zc's so there wasnt much wireing besides mpfi and im new to the ek's.

94EG8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">i want to put a obd1 d15b into my hatch in the future but i just need some info on changing obd2 to obd1 to put it in. what all do i have to change to put it in?</TD></TR></TABLE>

you'll need to swap distributors (or convert the one thats on there/use a jumper harness, swap alternators, repin wires for the IACV, check out http://technet.ff-squad.com for more info on that. You'll need a conversion harness on the ECU end to run an OBD1 ECU (either P08 or P28), D16Y7 uses an IAT mounted on the intake tube, the D15B vtec has it on the back of the manifold, you'll have to choose one, i'd go with the one on the back of the manifold personally. Finally you will need to add wiring for vtec. I'm sure i left something out but that should at least be most of what you need to know.

janz3n

thanks for the help.

janz3n

ok still a little confused. been searching for more answers but for some reason this is not covered too much.

when i put the obd1 d15b into my obd2a hatch i just have to put an obd2a si distributor and the obd2a alternator on the d15b then just get the conversion harness for the ecu? and every other sensor on the obd1 engine should just plug into the obd2a engine harness?

also what do i do about the second o2 sensor? obd1 only has one correct?

94EG8

Yes, the D15B only has one O2 sensor, you'll have to either plug the second hole or use the D15B manifold and downpipe, get an EX cat and do some custom exhaust work. Also i forgot to mention the injector plugs are different between OBD1 and OBD2, you can either cut the plugs off your current harness and solder on the OBD1 version or use OBD2 injectors if they'll fit the fuel rail, i think they do, but i could be wrong. and yes you'll need to swap the distributor and alternator cut and splice OBD1 plugs onto your harness.

janz3n

im planning on putting a header on the car before the engine swap im just trying to find a cat and mid pipe from an si/sir, canada does not have an ex model. the header has a plug for the second o2 anyways. do i just leave the secondary o2 sensor plug unplugged from the engine when i put the engine in?
im pretty sure my obd2 injectors will fit since i read that you can put obd2 d series injectors on an obd1 b16.
but why would i have to put obd1 plugs on my harness if i put my obd2 alternator and an obd2 distributor on the engine? i think im better off keeping the obd1 distributor and putting the obd1 plugs on for that though.

thanks for all the help and not hating on my noobness. i wish there was a write up for this stuff somewhere cuz i hate asking things on honda tech for fear of bashing.

94EG8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">im planning on putting a header on the car before the engine swap im just trying to find a cat and mid pipe from an si/sir, canada does not have an ex model.</TD></TR></TABLE>

Hey, another canadian! yeah i know we didn't get an EX, i never paid attention to where you were and i'm just used to converting models as most people on H-T are in the US.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">the header has a plug for the second o2 anyways. do i just leave the secondary o2 sensor plug unplugged from the engine when i put the engine in?</TD></TR></TABLE>

Yes

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">but why would i have to put obd1 plugs on my harness if i put my obd2 alternator and an obd2 distributor on the engine?</TD></TR></TABLE>

You don't i just meant either reuse your OBD2 alternator and distributor or use the OBD1 units and splice the OBD1 plugs into your harness to match them, i don't think i explained that very well the first time.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">thanks for all the help and not hating on my noobness. i wish there was a write up for this stuff somewhere cuz i hate asking things on honda tech for fear of bashing. </TD></TR></TABLE>

No problem, Its probably covered somewhere, just about everything is documented somewhere on honda-tech, it can be hard to find sometime though. The best way to not be a noob is doing what your doing, after you do a couple of engine swaps and see some stuff you learn a lot, sometimes you screw up but thats all part of the learning process.

janz3n

awesome thanks for the info. like i said in the first post.. i have done 3 engine swaps but they were all sohc zc's in efs with mpfi swap already done before hand ( by myself aswell) im just new to the whole obd1 and obd2 ****. i just wish the obd2 d15b wasnt 3 stage vtec or els id just get that. but i also want to tune the engine so im going obd1. also there seems to be a bunch more room in the ek engine bay to yank the engines out which im looking forward to.

i almost forgot about vtec.... do i depin the obd2 or obd1 side of the conversion harness to add the two wires for vtec? im guess the obd2 side. but i just want to make sure.

94EG8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">i almost forgot about vtec.... do i depin the obd2 or obd1 side of the conversion harness to add the two wires for vtec? im guess the obd2 side. but i just want to make sure. </TD></TR></TABLE>

You don't really need to depin anything, just pin your 2 vtec wires into the OBD2 plug before it plugs into the conversion harness.

janz3n

ya sorry... i didnt really mean depin. im just used to the mpfi swap where you depin some wires and switch them around.

for the iat sensor do i need to lengthen wires to use the sensor in the back of the intake manifold at all? and that link you gave me for the iacv repin doesnt have very many working links. do i use the obd2a pin out fix for 2 wire iacv? and obviously i have to put the obd1 plug on my engine harness to plug into the obd1 iacv?

94EG8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">for the iat sensor do i need to lengthen wires to use the sensor in the back of the intake manifold at all?</TD></TR></TABLE>

I think they will be long enough, I could be wrong but i honestly think they'll be long enough.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">and that link you gave me for the iacv repin doesnt have very many working links.</TD></TR></TABLE>

They should all work, but i'm sorry if some didn't.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by janz3n &raquo;</TD></TR><TR><TD CLASS="quote">do i use the obd2a pin out fix for 2 wire iacv? and obviously i have to put the obd1 plug on my engine harness to plug into the obd1 iacv?</TD></TR></TABLE>

Yes, you need to do the IACV fix, actually it doesn't matter if you use an OBD2 or OBD1 plug though, just as long as its 2 wire it will plug in the same.

janz3n

awesome thanks for all the help.

janz3n

since you seem to know your **** and have helped me out alot i got another question regarding the secondary o2 sensor on my car.. im buying a sir cat and midpipe this weekend so i can put a header on my car. im just wondering if i put my secondary o2 in the second bung just before the cat on the header will this throw any codes sicne its supposed to go after the cat? also does it matter what kind of wires i use to lengthen the o2 sensor wires to reach the new location?

2fastek

if your runnning a obd1 ecu it wont even utilize the secondary o2

94EG8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2fastek &raquo;</TD></TR><TR><TD CLASS="quote">if your runnning a obd1 ecu it wont even utilize the secondary o2</TD></TR></TABLE>

X2 Just put a plug in the secondary )2 sensor bung and leave the secondary O2 sensor unplugged.

janz3n

i know this but im putting the header and sir cat&mide pipe on this weekend hopefully on my y7 for now untill i put the d15b in . but i just realized that the sir cat and mid pipe will have a bung after the cat.

94EG8

Ahh, I understand now, that should throw a code, the secondary O2 sensor if memory serves me correctly monitors emissions after the cat. I suspect your going to have a CEL, not really that big a deal if your going to drop in a D15B pretty soon anyway.

janz3n

yup.
but the stock sir cat and mid pipe should have a bung for the o2 behind the cat so i wont throw a code.

janz3n

for anyone els looking to put this engine in there car go to d-series.org
i forgot about this site. lots of usefull info. mostly for egs it seems but im only on page 6 .