S4 engine built to the moon. FD upper intake manifold and TB. Mounts and everything are done. It's sitting in the FD so the last part is the ECU. I have a FD harness and a powerFC. What I want to know is do I need a FD front cover or can I use the FC CAS?

Any other input?

thanks

 

i would say it should work with the cas if its wired up right?

 

I would go with the FD front cover and ing triggers with the PFC .I am putting a FD motor and tranny in my silver GSL-SE .using the FD stock motor mounts ,front cover and oil pan .

 

they can both work. there are lots of second gens running around with a Power FC.

what would be easier? probably the FD setup if you have an FD harness.

 

would be a beast!!

 

true, but isn't that with a completely different map and setup to use FC coils/ign?

 

yes, the FC uses toggle ignition...where the same coil fires the F and R trailing coil based on what it just fired. (just a note) The FD ignition harness isn't part of the ECU harness

A Haltech could be set up to run this way...don't know about the PFC

 

The FC uses the same amount of coils as the FD, 1 leading and 2 trailing. The CAS is the same 2 pick-up design, the trigger wheel is just located in the CAS housing as opposed to being mounted to the crank pulley, it has the same 4 wires Ne, ne+, etc. With the setup that you are describing you would be better off using the FC CAS and the FD coils w igniter. It would be the least amount of changes, simply put one connector on in the place of the 2. You will then be able to just drop the PFC in and be done.

Unless you have alll the other FD parts laying around (WP, Alt, oilpan ,etc) to switch everything. The FD also has one additional bolt in the front cover that the FC does not have.

 

thank you for that info. hopefully I'll get this running soon and post some pics.

 

so you still gonna pfc?

 

100% incorrect

 

My FC has a leading coil, and a trailing one... so what about 3?

 

yeah I'm going to use the PFC. if not I'll sell it and snag a haltech.

he meant 2 leading 1 trailing.

 

I am running a PFC w/ a 2nd gen CAS. It works great. I used stock T2 coils with MSD 6A(reccomended by MSD's rotary specialist) and a FD igniter.

 

Still wrong.

FD = 2x trailing, and 1x leading
FC = 1x each

 

why does the FD have two trailing? they fire at the same time don't they? 2L 1T: that's how most aftermarket setups have to be installed.

 

Wrong! FC = 2x trailing, 1x leading. Just like the FD, and just like BlueTII stated!

Look at the leading coil. Where both spark plug wires go is one piece, one coil mounted to its igniter. Look at the trailing coil. Where each spark plug wire goes is a separate coil. So, it is TWO coils on a common igniter. Hope this clarifies it for you.

The trailing coils fire independently. The leading coil fires both leading plugs simultaneously. Firing both trailing coils at the same time could be bad. IE firing the plug after the apex seal has passed the trailing plug...

For each combustion cycle, the plugs normally fire leading -> trailing -> leading.
If you watched both rotors at the same time:

rotor 1) leading -> ___trailing___ -> leading -> next chamber -> leading
rotor 2) leading -> next chamber -> leading -> ___trailing___ -> leading

That would be at all times, unless there is an aftermarket ECU set up to use negative trailing split at light load, or in the case of the RX-8 built into it's factory ECU.

Vince

 

Are you kidding me? You really have no idea what you are talking about most of the time and should not be left alone with a keyboard to spread bad info on the internet.

The FC has 1 leading coil that fires 2 outputs at the same time, exactly like the FD.
The FC has 2 trailing coils that fire independently of each other, exactly like the FD.

The difference in the setups is that the FD has 1 igniter to fire them all and the FC has 2. The trailing igniter has a switching mechanism which modulates the firing of the 2 coils.

This is why when I was developing our adapter harness for the FD PFC into the S4 and S5 FC, I had to come up with this how-to to modify the trailing coils by adding another igniter to eliminate the need for the switching system.

http://www.banzai-racing.com/FC_coil_install_how-to.htm

As you can see in this picture there are clearly 2 trailing coils mounted on a bracket.

 

my mistake. I was considering that one coil pack...and yes i mentioned the toggle mechanism in my first post.

As for your direct shot at me was uncalled for...and extremely childish.

 

You stated it was the same coil, which it is not. Then went on to argue that you were right, which you were not. That is childish.

Do a little research before posting.

 

Damn, the ownership is strong in this thread.