- Thu Jun 30, 2011 3:21 am
#261642
Do not wire it to a switch, run the wires to the ECU and let the computer switch it on/off. Use a P28. You'll need to run 2 wires to the ECU and 1 ground.
Your stock ECU will not know what to do with a VTEC head installed. The wrong way is to install a switch or RPM activated switch to actuate VTEC. These switches are not able to adjust the fuel curves like an ECU should. So spend ~$100 and buy a P28 ECU from a 92-95 Si or EX. Get one from a car that has the same type of transmission as yours. (It's possible to convert an ecu to work on a different transmission, but requires very precise soldering.) The P28 will plug into your factory harness. If your car is automatic (as mine was) be sure to get a P28 from an automatic Ex. If your car is manual, be sure the P28 is from a manual car. (it's possible to convert an ecu to manual)
Once you have everything back together it is time to install the new ECU and additional wiring for vtec. The ecu is behind the carpet on the outside passenger foot area. Looking at the ECU pinout, you'll need to run the vtec solenoid to the A4 pin.
Vtec colenoid on a stock D16z6
There are 2 wires on the Oil Pressure sensor.
on a stock D16z6
The black wire is ground, orange goes to D6 on the ECU
Looking straight into the back of the sensor, the wire in the bottom of the pic will run to the D6 pin on the ecu, the top wire is just run to the chassis as a ground. Just be sure you have the sensor the right way when determining the D6 wire from the ground, hold it and compare the tabs on the outer edge to those in the pic. Use some connectors and heat shrink, do it right. If you can't get the harness clips to connect to the sensors, you can use a small butt connector and cover it with silicone as I did. I filled that back area of the sensor with silicone to make it weather proof.
Here is where you wish you had a 1992 hatch. All 92 hatches were pre-wired for vtec up to the passenger shock tower. Just look at the color of the wires for the A4 and D6 pins on the ecu and find them at the shock tower. Tap into them there and connect your sensors. Otherwise you will have to run the 2 wires through your firewall to your ECU.
Do Not PM me your technical questions. Post them in the forum!
My 1992 SOHC Turbo HatchMy Youtube Channel: 6th Gear Garage
