Hello. I have a 97 civic with a JDM b18c in it. I recently had it at a shop and they said that I am missing the vtec oil pressure switch. I am pretty sure I dont have the use for one on teh JDM b18c but instead, the shop that did the swap over a year ago said that it is being run off a coolant temperature switch. To make a long story short, I wanna convert from OBD2a to OBD1 to run Uberdata but yet, I know that there is differences in the JDM and USDM Ecus. When I get the chipping done, is there a way to get around this?

 

Either way, both OBD-1 and OBD-2 ECUs still look for the vtec oil pressure switch. However, I believe that there are some ROM editors that have the option to disable the vtec oil pressure switch in the software... Or maybe I'm just thinking of the knock sensor?

You can definitely get around it with hardware. Simply understand that it's only a switch. If the ECU see's the complete circuit, then it will go ahead and think it's safe to activate vtec. Just think about it, there are plenty of ways to get around it.

Or you can always just get a new vtec oil pressure switch itself. I don't think they're very expensive.

Either way, good luck!

 

Thanks for the advice.

https://honda-tech.com/zerothread?id=1065152

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VtecVillain In Diff Post &raquo;</TD></TR><TR><TD CLASS="quote">What he's referring to is the 96+ JDM motors not having a VTEC pressure switch which is true. They all have a VTEC solenoid but the 96+ JDM motors do not have the pressure switch built in. All pre 96 JDM motors and all USDM motors have the pressure switch.

I'd like to add that there is a simple wiring method that you can do if you are using a pressure-less solenoid with an ECU that looks for the pressure switch sensor. If anyone runs into this problem and needs to know how to wire around it without changing the solenoid, just let me know. </TD></TR></TABLE>

The shop that did the swap somehow wired it so that its running off a coolant temp switch.

 

Bump.

 

Anyone?

 

Come on I know there is some techs on here!

 

I have a obd2 jdm b16a in my 92 cx and it didnt have the vtec pressure valve switch either. I just took it to a local shop and they sold me a used US vtec soleniod for $75. After that u just plug the green swtich in and vtec should engage. By the way, it was converted to obd1

 

if it isi working NOW the way youhave it wired up then it should be an issue if you convert to obd1, because OBD1 still has the same collant switch as yours,

if anyone has noticed when you install somethin like a vafc on OBD 1 car, you cut and run the wire for the VTC pressure switch into the vafc, this is so the ecu doesnt "see" it as being cut.

the reason you do this is because the factory ecu wont let you use vtec until you have like 50pso of oil pressure which is roughly around 4600+rpms, but as we all know with a vtec controller we can go down to 3000rpms

 

"wiring" the oil pressure switch so that its running off a coolant temp switch is simply taking a coolant temp switch and plugging it into the oil pressure switch. It just acts like a jumper. You would get the same results as putting a paper clip into the switch. After a while you will prolly throw a CEL. A simple solution would be either getting a JDM ecu, or getting a US vtec soleniod. i used my d-series soleniod on my b series. If you were getting your ecu chipped it could probably be disabled.

 

I do have a JDM ECU. Its a JDM P72 which comes in the SiR-G's. So basically, you think that the shop that did my swap maybe bypassed the oil pressure switch somehow?

 

D series vtec soleniods are smaller than b series vtec soleniods arent they?

 

I'm running a b18c block with a p72 head that has vtec, got a b18c1 ecu and have vtec running on it now,motor is from an 01 integra, will running the motor this way hurt the block?

 

I'm running a b18c block with a p72 head that has vtec, got a b18c1 ecu and have vtec running on it now,motor is from an 01 integra, will running the motor this way hurt the block?
Also running an obd2 to obd1 conversion, ecu is a p72 obd1 for the obd1 conversion on my 93 civic dx hatchback