starting at the front of the car and going twords the rear which coil is trailing and leading?! I think I got them mixed

 

Front is trailing rear is leading. Tach works off of trailing coil as well.

 

are there any real advantages to putting a bigger coil in?

can you get an upgraded coil off the shelf for the RX? or are they too didfferent from waht piston engines use?

 

I bought the standard red MSD blasters for mine. Did I notice a difference? Yep, they are bright red, thats all I can be sure of. DLDFIS im hoping, assuming, and reading would be the best way to go, then you get the whole spark instead of half.

 

ok,
what is DLDFIS? is this the direct fire stuff ive been reading about?

 

another option

http://www.rx7.com/cgi-local/1catalog.cgi?cat=5&part=2

 

so upgrading coils does seem to help or you are meanign as part of an ecu upgrade? my 1stgen is all mechanical

 

unless you have a 1979 or 1980 and then the tach runs off the leading.

 

You won't notice a difference from upgrading coils unless one of yours is identified as being bad, already. Usually, what happens is that they begin to leak, and the oil insulator that surrounds the coil pack will dissipate to the point that it no longer insulates, and then you start to get a lower intensity spark until you have no spark at all.

I think the aftermarket coils are good preventative maintenance to replace a 20 year old part, but for performance, unless you go to a system that requires a super efficient spark heat and length, then you're not going to see a benefit for a normal street tuned car.

Once you move up to MSD or other electronic ignition that controls coils, you might see some benefit... on a dyno. For the money, it's a cheap upgrade to ensure that your car is working at what it was designed to. HTH,

 

Could you run the tach off the trailing on an SA if you wanted to? Or would that not work?

-Marques

 

From my limited knowledge of my own car, I have read that the trailing in a SA doesn't fire all the time. I think you would be in for erratic tach signal but I don't know.