Hey guys I have a spare B18a1 block sitting in my room and im considering using it for my turbo buildup but im not sure what sensors need to be changed and what other modifications i would need to make to the block to make it drop in place of my obd2 (running obd1) B18b1 engine. I will be using aftermarket cams, mild PnP, aftermarket IM, aftermarket pistons and rods etc just worried about the sensors etc.

any info is very appreciated

 

ttt

 

Same thing. You just have a couple of extra sensors in the back of the b18a block that you will not be using. That simple!

 

so swap dizzy's and everything will work fine running obd1 ecu? What do i do about the 2 pin knock sensor?

 

OBD1 b18a or b does not use a knock sensor. So you don't need it. OBD1 ecu will work fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ek99 &raquo;</TD></TR><TR><TD CLASS="quote">OBD1 b18a or b does not use a knock sensor. So you don't need it. OBD1 ecu will work fine.</TD></TR></TABLE>

really? i thought that obd1 and obd2 used knock sensors? So if i unplug the knock sensor on the back of the block on my personal swap it will make no difference to the way the engine runs?

 

ttt

 

Same thing, u must run an obd1 dizzy or an obd2 dizzy as long as u wired it up correctly. LS motors DO NOT Have a knock sensor so dont worry about that. One of the sensors on back of the B18A block should now be located on the thermostat housing (Coolant Temp Sensor for the fans) Other than that u should be good to go.. Oh yeah one other thing.. If ur car is an obd2 running a obd1 pigtail, i recommend changing oil pumps with ur obd2 motor. Why? All Obd2 and up LS motors share the same oil pump as a GSR, Type R, or B16, what does this mean? More oil pressure and also obd2 oil pumps have an extra sensor on the pump also for obd2... Hope this helps

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VNTEC &raquo;</TD></TR><TR><TD CLASS="quote">Same thing, u must run an obd1 dizzy or an obd2 dizzy as long as u wired it up correctly. LS motors DO NOT Have a knock sensor so dont worry about that. One of the sensors on back of the B18A block should now be located on the thermostat housing (Coolant Temp Sensor for the fans) Other than that u should be good to go.. Oh yeah one other thing.. If ur car is an obd2 running a obd1 pigtail, i recommend changing oil pumps with ur obd2 motor. Why? All Obd2 and up LS motors share the same oil pump as a GSR, Type R, or B16, what does this mean? More oil pressure and also obd2 oil pumps have an extra sensor on the pump also for obd2... Hope this helps</TD></TR></TABLE>

K im confused then, whats the connector on the back of the block (obd2 has 1 pin, obd0 has 2 pin) for? I thought that was the knock sensor but if you said that LS motors dont have knock sensors then im real confused as to what that sensor is on the back of the engine beside the oil filter.

Are you saying if im running an obd1 ECU with an OBD2 motor i should use an OBD1 oil pump?

 

Ok, on the obd2 LS engines theres only one sensor. Oil pressure sender switch(1pin). On the obd1 or obd0 but mostly obd0 there two other sensors. One is a coolant tem sensor(2pin), wich you have on the thermostat housing on the b18b and the second one is a oil sensor(2pin) which all new LS's dont use. The one that you think is a knock sensor in the oil pressure sender switch(1pin).

 

ah, well that makes sense thanks for clearing that up. So in order for the engine to run properly this must be connected correct? If im using an obd0 block what do i do to make it work obd1 seeing as the obd0 has the 2pin oil pressure switch.

 

No, the oil pressure sender switch is the same, just that the b18a has two extra sensors(an oil sensor and the coolant temp sensor) that you will not be using.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ek99 &raquo;</TD></TR><TR><TD CLASS="quote">No, the oil pressure sender switch is the same, just that the b18a has two extra sensors(an oil sensor and the coolant temp sensor) that you will not be using. </TD></TR></TABLE>

Well i have an a1 block in my room and where there is the 1-pin sensor on the b1 block there is a 2-pin sensor in its place? Do i just use one of the pins or do i have to swap out the whole sensor? Thats basically what id like to know

 

TTT