When it comes to wireharness i dont know anything about it......i read there a sub harness iono what that is...how do wireharness run through the car?is there only one main/long harness that connect everything or is there like 3 part of a harness?(main harness,subharness ect)also how to remove and run a new harness say a b20 harness in a 90 civic hb std..

 

well if you wanted to run a b20 harness in your 90 hb..
there is a harness under the dash ( chassis Harness )
there is a Harness in the engine bay connected to the engine disconnects on the driver and passanger side... 2-3 plugs on the passanger side and 1-2 on the driver side
there is a harness in the Rear to the tail lights rear wipers ect
aswell as some harness in your engine bay running to the lights and signals

since your 90 hb is a standard .. you would need to convert to MPFI
and modify your Stock STD engine harness to work on the b20 engine

 

So basically there a harness for a lot of stuff in the car,

lights harness,engine harness and the stuff inside the car..

So when doing a engine swap mainly i have to change is the engine harness only (beside ecu,axle,mounts ect).....and the ecu is connected to the engine harness not any other harness right...? How about the mpfi swap...does that have a harness of its own? Or is it one piece with the engine harness?

 

if you search up dpfi to mpfi. it will tell you step by step
basically you have to run some extra wires for the other injectors..
the ecu is connected inside the engine chassis harness and connects to the engine harness aswell...

when doing a b series into a ef....

Axels 90-91 and intermediate shaft
ecu pr3 and might be others...
Mount kit .. hasport..innovative or egay (not reccomended bad engine placments will casue you to blow axels hood clearence issues and so on)

you need to add some wires to your stock engine harness...
you cant use the b series harness you need your stock one and modify it

 

Alright...chassis harness engine harness its starting to make sense to me...one more thing though is the chassis harness connected to the engine harness by clips? Where i can disconnect one from the other by un clippin them?

 

yes, they are connected, usually behind or close to the shocktowers on both sides

 

Where and what are the shock tower? Is it where the shocks is scewed down at right next to each fender?

 

yes that would be the shock tower ... here is a pic showing you where its normally connected..

the red arrows show the connections...

 

Alright thx

 

anytime... any other questions?

 

Nope,but i aching to do a swap like urs badly..