is there anything ineed 2 know for this swap or is it straight swap plug n play ... and im also wondering is all the wiring the same like can i use my cx wiring to use with the JDM si motor ?

 

need to wire VTEC, other than that... pretty straight forward.

 

wat bout the engine harness will it be straight plug in

 

yes, but you will need to add the wires to your ecu (1 from the vtec solenoid and 1 from the vtec oil pressure switch) provided the new engine you are using is obd-1.

 

if you also want it to run at it's best you'll probably want to get your current ecu chippped and have v-tec added.

 

If you wanna spend that kind of money. It's cheaper to get the proper ECU (P28 is the USDM version, they go for 100$ or less around here).

You will add 3 wries. 1 Vtec wire, 1 Vtec oil pressure wire, and 1 vtec oil pressure ground. Everything else is plug and play if you buy an OBD1 engine.

 

zeeman will chip/vtec and add a basemap for around the sameprice if you dont want to go thru the hassles of finding another ecu, testing it to see if it works, etc.

 

not to mention running a p28 on a d15b isn't exactly the RIGHT ecu, you should get a p08 if you just wanna use a stock ecu.
If you use a p28 you'll still have to get it chipped to run the d15b program, in which case you'll pay more than having your stock ecu chipped and modded for vtec.