lonerider

Aight I have a D15B that has about 30k on it that I had laying around from an old car I need to know if you can use the stock p28 on it and still run it. I've researched it some and can't find a straight answer. One person said the oil pressure switch isn't on the D15B so the car won't run right another said the O2 sensor is just one wire on the D15B while the USDM uses a four wire O2. Has anyone done one of these personally. The car is gonna be turboed somewhere in the next month and if I go with this setup will probably have a P08 map on it. I just need to know if the car will run right with a stock p28 until I can get it chipped and the new maps loaded.

Fabrik8

The O2 sensor is an easy fix, you just have to use a 4 wire O2 sensor.

Ground the pressure switch input to the ECU.

You can do this at the ECU or in the engine bay. If you already have an engine harness with the pressure switch and VTEC solenoid wires in it, you can just connect the switch wires together (which will ground the switch input, just like when the switch sees enough oil pressure). If you don't have a harness with those wires, ground the switch input at the ECU.

Be gentle on the car until you can get the proper tune for that engine.

Fabrik8

Oh, a quick word of explanation... If you Google the pressure switch bypass, you'll see a lot of forums that have a bypass which connects the pressure switch input to the VTEC solenoid output, like this thread:

http://www.honda-tech.com/showthread.php?t=1693528

That bypass also effectively grounds the switch input. Because one side of the VTEC solenoid is always connected to ground (the ECU sources 12V to the other side of the solenoid to activate VTEC), the pressure switch input is now grounded.. Obviously when VTEC is engaged the pressure switch input would now be at 12V (not ground) but that just says that the ECU doesn't care about the pressure switch input once VTEC is already engaged.

Anyway, I either method will work fine, and they both effectively do the exact same thing (grounding the pressure switch input). I just wanted to clear up the confusion before you say "well you said do this, and someone else said do this instead".

People often blindly pass along bypass tricks without knowing how they work, and there are often multiple ways to do the same thing if you know how something works. Many people just want to be told what to do and don't care why though... That's fine, but it's also a really poor way to get any understanding of what you're doing.

CivicRenModelX

Is this a d15b non vtec or vtec?

lonerider

Vtec

lonerider

what would happen if you used the the d16z6 wiring on the d15b motor would the motor run right