Vtec Mystery - B16a in 94 Dx hatch

[jdmh22eg2]

well are 100% sure u are running an obd1 ecu if u are then if memory is good it just needs to be one for an obd1 dA b16 car or b17 car not sure tho it has been a min

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[B serious]

Originally Posted by B Dap

So what resistor box would i need to get?

If you're using a DA ECU, you'd need the resistor box from the DA and the injectors from a DA.


You didn't answer which model year SOHC engine the injectors on your car were from.

[B Dap]

Originally Posted by B serious

If you're using a DA ECU, you'd need the resistor box from the DA and the injectors from a DA.


You didn't answer which model year SOHC engine the injectors on your car were from.

The injectors are from a obd1 sohc-v. The ECU most deff. has b16a da6 written on it. So i cant take the resistor box out of any Da aswell as the injectors?

[B Dap]

But then my question is this... Why will it not work when i hook up a p28 in my car? Soc-v's run on p28's...also tho the p28 i had in there was skunk2 chipped on a gsr map i believe if that matters.

[jdmh22eg2]

u need to find a da resistor box that is all ur prob i am willin to bet on it and get the inj if u can

[B Dap]

Ok im getting differet opinions on this resistor box thing. One person says i need it and my buddy says i dont. Im starting to wonder if this is just a obd0 motor and i got screwed over.

[B serious]

The engine itself doesn't matter. It's just a peice of hardware. The software controlling the hardware is what matters. The ECU doesn't know what engine is in your bay. I could make a OBD2 ECU run a OBD0 engine with no CELs if I wanted to.

You do, however, have to have the correct input/outputs. So the sensors and electronics have to be correct. You're using different injectors with an ECU that requires a resistor box. That's probably the reason your car ran well with the P28.

VTEC on GSRs (P72 ECU) and P28 ECUs engages at 4500RPM or so. You may have not heard it...especially if you were listening for a change at 6k RPM. The lower you set your VTEC, the more subtle it will be.

Do you have an intake or exhaust on the car?

[B Dap]

Originally Posted by B serious

The engine itself doesn't matter. It's just a peice of hardware. The software controlling the hardware is what matters. The ECU doesn't know what engine is in your bay. I could make a OBD2 ECU run a OBD0 engine with no CELs if I wanted to.

You do, however, have to have the correct input/outputs. So the sensors and electronics have to be correct. You're using different injectors with an ECU that requires a resistor box. That's probably the reason your car ran well with the P28.

VTEC on GSRs (P72 ECU) and P28 ECUs engages at 4500RPM or so. You may have not heard it...especially if you were listening for a change at 6k RPM. The lower you set your VTEC, the more subtle it will be.

Do you have an intake or exhaust on the car?

I have i/h/e... So my question is where and how do i hook up the resistor box? And either way if vtec still was working at 4500(i dont think it was) it was still spitting and felt like it was missing. Im running the JDM Pr3 ECU

[B Dap]

my buddy says coolant temp sensor? anybody have an opnion about this?

[B serious]

Originally Posted by B Dap

my buddy says coolant temp sensor? anybody have an opnion about this?

Originally Posted by B serious

I can tell you that VTEC needs these things to work:

-CTS reading warm
-Oil pressure reading in range
-VTEC hardware/software/wiring in working order
-MAP reading
-TPS above certain %
-VSS reading over certain speed (12mph, IIRC).
-RPM trigger

The question now is why your friend thinks the CTS is bad.

Another thing is that your car might not be getting enough fuel mechanically. Maybe the fuel line that you used to link the filter to the rail is incorrect.

[es01civy]

Just to throw it out there was the head ever taken apart?? Cause if so maybe the oil jet for vtec in the middle of the third cap is missing... Not giving it enought oil pressure..

[B Dap]

Originally Posted by es01civy

Just to throw it out there was the head ever taken apart?? Cause if so maybe the oil jet for vtec in the middle of the third cap is missing... Not giving it enought oil pressure..

I was told it was stock and never taken apart. I checked to make sure that the ground was there by the thermostat, and that the CTS was plugged in. Is there any other way to check it besides hooking it up to the s300? I have an AEM fuel rail. My buddy said he just attached the fuel line running to the filter...idk what car it was from? Looks brand new...

[jdmh22eg2]

look not to be an ass but u are sayin ur buddy this ur buddy that i am not sayin he dont know what he is doin or dont know anything but i bet money that if u are running a DA b16 ecu U NEED A RESISTOR BOX i know that chassis needs uses one on that motor and so that is what u need i am almost 100% sure

[B Dap]

Originally Posted by jdmh22eg2

look not to be an ass but u are sayin ur buddy this ur buddy that i am not sayin he dont know what he is doin or dont know anything but i bet money that if u are running a DA b16 ecu U NEED A RESISTOR BOX i know that chassis needs uses one on that motor and so that is what u need i am almost 100% sure

Thats fine i was just posting it up to get different opinions. We just didn't know how to hook up a resistor box in a car that doesn't normally need one.

[jdmh22eg2]

if i remeber when i did mine i got the digram from here on H-t that was like yr and half ago

and the reason the restor box is ur prob is that the da inj are peak and hold and the sohc ones are saturate style or other way around i cant remeber off top of my head

[B serious]

The resistor box isn't the greatest idea in your chassis. Too much work.

Buy an OBD1 B16 ecu that doesn't require a resistor box. From like an EG6 or something. You're using SOHC OBD1 injectors, IIRC...so those will match up.