twizted-myatt

ok so i'm having a lot of problems out of the motor in my car now. its a y7 block with a y8 head, 5speed. i can get my hands on a jdm d15b stage 3 vtec with ecu and tranny for dirt cheap, no wiring harness. so my concerns are; i was told i could use the wiring harness off of tha d16 motor in my car now. can i? and i was also told that i would need to get a different oil pump or something of that nature, is that also true? and why? would everything just bolt right up? and could i use the 5speed tranny in now with the d15? sorry for all the questions but never done anything close to a swap before and want to know what i'm getting into before i buy. thanks guys!

Bluegixxer1k

I dont see why you would need a new oil pump. if it comes with an oil pump and oil pan you should be fine (dont use d16 oil pan for the d15). I think you are good on the wiring harness also. Im allmost 100% it will plug right up. It plugged right in my 92 si. And yes you can use the same tranny. All d series trans are interchangable from what i understand, someone correct me if im wrong.

HondaPartsHero

Without the correct ECU the VTEC won't be optimum. If the new engine has the CKF sensor on the oil pump you are good, if not you'll need the oil pump and CFK related parts from your old engine.

twizted-myatt

ok thanks guys. it comes with a p28 ecu which he said he used when he had it in his car.

PandaEj6

you can use your trans w/ the d15b but not the p28. p28 is for a d16z6. You need the corresponding ecu to your motor. 3 stage means 12 valve mode, 16 valve mode, vtec mode. The p28 will not know what to do.

twizted-myatt

do u know which ecu i should use then?

PandaEj6

p2j would be the correct ecu

twizted-myatt

would it still run on tha p28? bc right now, tha motor in my car isn't even running

PandaEj6

It will run with the p28, but to utilize the 3stage you will need the p2j. Running the p28 will be just like a jdm d15b or d16z6

twizted-myatt

just talked to the guy again and he said he used a p29 ecu. sorry still new to the whole honda scene guys so thanks for all tha help and try and bare with me lol

Wrona

to actually make the 3-stage work ur going to need this http://cgi.ebay.com/ebaymotors/JDM-D...item3cb83f4a49

without it there is no 3 stage vtec

PandaEj6

wtf??? p29 is for dohc zc motor...any advice this guy may give you dont take it. Sounds as if he dont know what he be talking about yo!

twizted-myatt

lol that's what i'm starting to think. he's the one who told me i can just bolt everything right up, use my d16 wiring harness and tranny, and it'll start right up and go.

twizted-myatt

is the d15 obd2? because i know my d16 in it now is. sorry if that's a dumb question but i'm still new lol

twizted-myatt

and will the motor mounts work? thanks guys

PandaEj6

If you can get the motor get it...at the same time order that p2j ecu wrona linked you to on ebay.

Use your harness
Use your mounts
Use your trans
Use the correct ecu

Thats it

The motor will more likely than not be obd2. The 3 stage appeared in 95 being obd1 but not many of those will be around.

twizted-myatt

ok cool man. sounds like i'll prolly be getting it this weekend then. thanks for all tha info guys.

twizted-myatt

last question guys i swear lol but since my wiring harness is obd2 and the motor is obd1, would i need a conversion harness?

twizted-myatt

D15Z7

3-stage VTEC
Found in:
1996-1999 Honda Civic VTi EK3 and Ferio Vi
Displacement : 1,493 cc (91.1 cu in)
Bore and Stroke : 75 × 84.5 mm (3.0 × 3.33 in)
Rod Length : 137 mm
Rod/Stroke : 1.62
Compression : 9.6:1
Power : 128 hp (95.4 kW, 130 ps) @ 7000 rpm
Torque : 102 ft·lbf (14.2 kg/m, 139 Nm) @ 5300 rpm
Valvetrain : SOHC VTEC (3-4 valves per cylinder, depending on rpm)
VTEC Switchover : 5800 and 6200 rpm
Fuel Control : OBD-2 MPFI
ECU Code : P2J
Manual Transmission ECU Codes : P2J-003 (OBD2a), P2J-J11 (OBD2b)
Lean burn capable

see that's where i'm getting a little confused, because that's the only thing i've found on a d15 with 3 stage vtec and it says obd2 and different years than pandaej6 stated

B18CivicEJ8

You found your answer right there. The motor should be OBD2. Not OBD1. If the person selling you the motor says it's OBD1, then something is wrong. I'd look at the engine code stamp to make sure it's the 3-stage VTEC motor. Then I'd check to make sure it has two solenoids. To answer the question, it would depend on which ECU you run, if you are running the ECU from that Ebay post, then you'd need an OBD2A-to-OBD2B conversion harness. If you find the P2J-003, then no.

twizted-myatt

since my car is a 96 and tha d15 is 96-99 wouldn't it make them both obda?

twizted-myatt

https://honda-tech.com/forums/acura-integra-6/how-do-figure-if-its-obd2a-obd2b-2760019/

twizted-myatt

sorry meant to put the link in the first time. i'm assuming all that according to the pic on that page

PandaEj6

I said the motor will more likely than not be obd2

PandaEj6

No...if it is a 96-98 motor it is a obd2a if the motor is a 99-00 than its obd2b. Nonetheless agreeing to 'b18civicej8' you will need the obd2b-obd2a jumper harness for that ecu...which imo goodluck finding the p2j-003. Jumper harness will be around $75. Not a big deal