Author: Katman / Created:
April. 05 / Last Updated: Jan. 08
SYNOPSIS
This article explains MY WAY of how to get a JDM or US OBD2 B-series engine
running in a OBD1 civic/delsol/integra vehicle by using an OBD1
ecu or JDM OBD2 ecu.
This type of swap is common nowadays and is highly asked about
on many Honda message forums. One swap that instantly comes
to mind is the JDM ITR engine or B18C-R into an EG civic or DC
integra. Personally, I'm sick of posting
up every little detail of how to do this swap on H-T, so I've
finally created this article that I can directly link
newbs to.
The information I'm providing is a quick run down of what you
need in order to get an OBD2 engine up & running in
your OBD1 vehicle -- REF/smog legalities aside. Getting your car REF'd (smog legal) is a whole other beast which I can make
an article about at a later date.
OVERVIEW & VEHICLE DIFFERENCES
All 92-95 Honda civic/delsol/and integra's are ALL OBD1 spec. Yes,
that means 92-93 DA integra's are OBD1 for you that didn't know!
What's neat about OBD1 vehicles is that you can swap around OBD1
electronics (distributor, injectors, ecu, starter, alternator,
and most wire engine wire harnesses) between virtually any fellow
OBD1 civic/integra model respective to B or D series engine of
course.
92-95 CIVIC/DELSOL &
94-95 INTEGRA PARTS NEEDED
Required parts
in order to bolt an OBD2 B-series engine
into EG/DC chassis:
('94-95 integra owners
can reuse the items you already have that are
mentioned below)
-
94-01
integra or 99-00 Civic Si front tranny bracket (from
any 5speed model)
-
94-01
integra rear engine "L" shaped bracket (from
any 5speed model)
-
94-01
integra driver side 3-post mount (if going B18B/C/C5
- not needed if going B16/B17!)
Note: You can reuse your
existing civic/delsol driver side dual-post mount if going
OBD2
B16A
-
94-01
integra or 99-00 Civic Si A/C bracket
-
94-01
integra or 99-00 Civic Si complete shift linkage
Note:
Delsol owners must use
a B-series delsol shift linkage (rare to find used;
best if bought brand new from Honda)
-
94-01
integra or 99-00 Civic Si complete axles w/half-shaft
-
A
U.S. 96-01 integra engine wire harness is a MUST for this
type of swap!
This is a key ingredient
in getting an OBD2 engine to work in an OBD1 vehicle. The ever
so clever Honda engineers were cool enough to make the US OBD2
Integra/Delsol engine wire harnesses backwards-compatible with
OBD1 vehicles.
-
OBD1 ecu
to power the OBD2 engine or an OBD1-> JDM
OBD2a/b ecu jumper harness adaptor to adapt a JDM/US
OBD2 ecu
92-93 (DA) INTEGRA PARTS NEEDED
Because of chassis differences, OBD1 DA integra owners will
have to reuse their existing motor mounts, shift linkage, axles,
and cable transmission on
the OBD2
engine, which is all
completely compatible. However, for wiring & ecu,
they can use a 96-01
US integra
engine wire harness and ecu information
below.
ECU & WIRING EXPLAINED
Now, the reason for using a US OBD2 integra
engine harness is to save you time & money in not having
to convert the OBD2 engine to OBD1 spec! Do note that
you cannot use a JDM OBD2 integra
engine wire harness because it is designed for a
right-hand drive vehicle! The main plugs are on
the wrong side of the harness/engine bay. Save yourself
a wiring migrane and get yourself a U.S. OBD2
integra harness!
If you were wondering about using
a U.S. OBD2 civic engine wire harness - fuggedaboudit
- you cannot use
an OBD2 civic wire harness in an OBD1 vehicle
because of it's 1-piece design (harness is one piece from the engine through the firewall, all the way to the
ecu plugs). OBD1 civic/delsol/integra & OBD2
integra's all use
a 2-piece design (harness breaks off at the shock towers) which makes it possible for backwards
compatibility.
When it comes time to install the
OBD2
integra
wire
harness, there
will be a few plugs that
will not plug into your OBD1 vehicles
main shock tower plugs
- don't
worry! This
is totally normal and everything
will run just fine. Do note
that if you are dropping
an OBD2 VTEC engine into
a non-VTEC OBD1
vehicle , you will have to wire in VTEC, the knock sensor, and IAB (GSR/SiR-G engines only). You
will have to wire these items
in the same fashion as
if an OBD1 engine was in
your vehicle - same ecu pinout
locations.
Also, if you're dropping
in a JDM OBD2 engine, these
motors do
not have a VTEC Pressure
Switch (VTPS).
So, you'll have to perform
a small wiring fix
for this
or swap
out the JDM VTEC Solenoid
(VTS) with that of a
U.S. VTS. The VTPS has a
2 wire plug (positive
& ground), the VTS has 1
signal wire.
VTPS FIX:
Take the power wire for
the VTPS
and splice it into the VTS
wire, then take the VTPS ground wire
and ground
it to the actual body of
the VTEC Solenoid - that's
it! If done
correctly,
your ecu will not throw a
check engine light for code
22 (VTPS). If you wind up
using a JDM OBD2 ecu, you do not need to perform
this VTPS fix, because the JDM OBD2 ecu
doesn't look for a VTPS.
I bet you're wondering about
the ECU side of the swap
now, eh? Well,
it's simple - you have 2 options:
-
(Best
option)
Simply use an OBD1 ecu respective to your engine
type i.e. OBD2 GSR engine -> use
an OBD1 GSR/P72 ecu. This will plug directly into your
existing OBD1 factory ecu plugs and power the engine.
If there's no equivilent ecu available
for
your engine type (i.e. OBD1 ITR ecu - no such thing)
use a reprogrammed OBD1 ecu like a reprogrammed
P28.
-
(Good option if you have the $$)
If
using an OBD1 ecu isn't your style and you'd rather use
an OBD2 ecu, not a problem, it's doable.
First, you'll need to purchase an OBD1>OBD2a/OBD2b
jumper harness adaptor - ( which
I sell) depending on which OBD2 type (a or b) you
planning to go with.
Second, you'll need to figure out if you want to use
a JDM or U.S. OBD2 ecu. If you decide on a U.S. OBD2
ecu, then you will need to manually wire in a 2nd
02 sensor and perform
the " CKF Fix".
JDM OBD2 ecu
users do not have to worry about a 2nd 02 or the CKF
sensor as these ecu's are not programmed to look these
sensors.
You can read about the CKF Fix -> HERE
At this time I do not have a 2nd 02 wiring article
ready.
END OF ARTICLE - NO ADDITIONAL INFORMATION AT THIS TIME
The information in this article applies
to:
- OBD1 civic/delsol/integra vehicles
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