I've been looking around online and I've read that cutting the washer off the spark plugs enhancing performance and raises compression in the engine a little bit. Is this true?

 

Compression is raised by an insignificant amount, so no.

And you do not want to do this on your trailing plugs.

 

What would happen if I did that to my trailing plugs?

 

If the plugs are too long they can break the rotor housing.

 

oh ****, that's no good. i already did it before i got the chance to read this but it's been a few weeks and everything is fine. i got a new tps on the car and it's running better then it ever has before so i'm stoked.

 

also dont forget to put some antiseize on your plugs. !

 

im new to rotarys and tryin to learn fast but side by side i cant tell by lookin how can i tell which are the trailing plugs

 

They are marked, first of all.

On the engine, leading = lower, trailing = top.

 

nah, is there a difference in the plugs i know where they go.

 

Yes, there is a difference. Stock trailing plugs are colder than leading plugs (heat index of 9 vs. 7).

 

i know the placement and which plug is which but by looking at them i cant tell why they are different i just ment do they create a different spark or do they recieve a different voltage

can the ignition system from the fc be used on the fd swap????

 

No.

Yes. FC coils are better than FD coils.

 

i have a mines ecu for the 13b-rew but does any one know where i can find a wiring diagram for an fd so i can start making the harness for it. i have a diagram for the fc just waiting on the other.

 

I just verified this on my housing while doing the rebuild. It has enough clearance on both leading and trailing plugs, so if ever cut them both have no worry!

 

You need to phrase your questions more clearly to get meaningful answers.

Leadings are 7s, trailings are 9s. From their outward appearance they look the same save for the part number and the T or L marking.

Only if you use the FC front cover, FC ECU, FC injectors, AFM, etc. etc. etc. So no.

See the FSM in the FD FAQ.

For stock plugs, yes. With aftermarket plugs...it depends on the plug.

Still, there is no reason to remove the sealing washer. After all, it is there to seal.