ryan_77

iTrader: (2)

so i bought a 1998 d16y8 vtec engine and tranny swap. i plan on putting it into a 1999 dx hatchback which runs a d16y7 non-vtec. the guy who sold it gave me an sir ecu. wondering if this would work or should i get a new ecu. can someone also explain how to do the wiring for ecu, IAC, and the vtec. or give me a link that explains it. thanks

army031

well first off whats the ecu code? to ensure what ecu u actually have, should be 1 letter 2 numbers, Ie, p30, p06, p07, etc. Also have u ever done a swap before? In any car, would really help u understand certain things if u have, I will look for a wiring link for ur swap shortly.

SilverSleeper

The proper ECU you need is a P2P ECU. If your car was originally non-vtec, then you will need to run a vtec wire from the solenoid to the ECU. The problem i see is your IACV. The Y7 is three wire where as the Y8 is two wire. I'm not exactly sure the fix for this.

Best of luck

army031

ok for the iacv problem, do the following

you will need to take two spade connectors and connect them to the two prongs on the male side of the IACV connector, the connect these two wires to the three-wire female plug on the y8 wiring harness, being sure to disregard the orange wire. You will need to swap wires A12 and A14, and then disconnect wire A13 from the plug at the ECU.

Understand ok? so pretty much, cut the wires off of the iacv, get a set of connectors, 2 male 2 female, connect the other to wires together minus the orange one which is omitted. Then back down inside the car, where ur ecu harness goes to the ecu, swap a12 wire with a14 wire. then completely take out wire a13. Let me know if you need the vtec wiring walkthrough that one is pretty straight forward.

ryan_77

iTrader: (2)

so the ecu i have is this:



does that tell you which ecu it is?

and for the iacv is this what your talking about?:


and thanks alot for the input guys.

ryan_77

iTrader: (2)

if you look at the second ecu pic, there is a barcode between the grey plugs and the metal cover which reads: 37820-P2T-C12
1171-200144 1E04

so i dont know how to tell which ecu it is.

ryan_77

iTrader: (2)

k i did some searching and found out what it is. its a 99-00 sir ecu.
P2T which is OBD 2b vtec ecu. so how would i have to rig this to work with my car and engine?

zeeman

iTrader: (1)

if your car is obd2b plug it in and go

but why use a SIR ecu on a d16y8? Thats a DOHC VTEC ecu.

you'll also need to wire up vtec and prolly do the 3-wire to 2-wire IACV mod

ryan_77

iTrader: (2)

lol because thats the ecu the guy gave me because he had an extra one and said it would be easier than using a 98 ecu.

ryan_77

iTrader: (2)

will an sir ecu affect the performance of an si engine or does it matter?

SilverSleeper

It won't run right at all. It's made for a completely different motor. P2P is what you need.

army031

ya dude, u need to get the proper ecu, it'll run like ***, prolly confuse the hell out of the computer, kinda expecting another cam and all, lol. Anyways, yes thats what i was talking about (the iacv pic). I'd prolly do that last for the swap though, get everything in there and good to go.

ryan_77

iTrader: (2)

so the question is, who knows where i can get the right ECU? and would i need a new wire harness? if someone could provide an answer for these or can get the parts for me that would be great.

zeeman

iTrader: (1)

all you need is an obd2b civic SI (d16y8) ecu.

Or you can convert to obd1 and use a chipped p28 with a d16y8 program on it.

ryan_77

iTrader: (2)

but the engine is obd2a so how would an obd2b ecu work with it?

zeeman

iTrader: (1)

it doesn't matter. All that matters is that the engine harness you are using is obd2b, so the obd2b computer will plug right into it. All of the underhood things will plug in, except for maybe the distributor and alternator, the plugs might be different, in which case you could just re-use your old stuff.

ryan_77

iTrader: (2)

oh ok i get it now. thanks a lot everyone for the help and hopefully the swap will be successful. ill take pictures as it is done and post it in case anyone plans on doing the same swap.