FD Racer

I have an extra coil from my 3rd gen that I was thinking of putting on my '83 streetport 12a. I was ready to go with standard DLIDFIS using blaster2 coils and an extra ignitor (I already have everything I need), but then I found the extra 3rd gen coil and started thinking.

I'm thinking it would be easy to wire the 3rd gen coil in place of the regular leading coil and simply connect the two leading plugs to it....no need to wire the extra ignitor. It would be very easy. It would seem to be an improvement over stock.... but would it nearly as good as DLIDFIS?

What do you guys think? I was hoping to hear from all the DLIDFIS gurus.

tia

FD Racer

a pic:

RotorMotorDriver

iTrader: (1)

I thought they (the FD's) had a different setup than us in the way the sparks work? Like both leadings fire at the same time, but the trailings are seperate? Where as with us we fire two leadings with one trailing? I could be off base and confused. I havent thought about it in a while...

~T.J.

Spieder

Actually you bring up a great point. Two blasters are like 70 bucks and change. They take up a lot of space and have extra wires.

If you go to Kragen.com and add a 1994 RX-7, go to coils. Beck Arnley makes a dual lead coil for 85.00 part #178-8224. It's alot smaller than the 2 MSD's. I am thinking you could mount it on the engine and run the plug wires straight down to the leading. That way you can reduce alot of impedence.

I don't think our ignitors will hold up for it though. I read the 2nd gen's cd coil kills them. If you add an MSD or ACCEL ignition (which comes up as a replacement under the 1994), then you've cut down on the bulk and length of wires. I will email MSD and ask what they think. I was thinking of taking my MSD's back anyways because I got ticked that they don't want them mounted horizontal. You'd think an important thing like that would be on the OUTSIDE of the package. Of course, that's why I buy from Kragen's, you can change your mind .

FD Racer

You're close.....FDs fire both leadings at the same time and each trailing seperately. Thats why Fds have 3 coils, two trailing coils with one output and one leading coil with dual outputs.

Our 1st gens use two coils and each of them fire whenever any of their two plugs need spark, but it's the distributor that decides where to send it and therefore no spark goes by "wasted".

Many people refer to the FC and FD system as a Wasted spark system becouse every time the leading coil fires, it sends spark to both rotors.... but only one of the rotors truely needs the spark each time. Every other spark, on each rotor, gets fired during the exhaust cycle on the rotor face that just made power. Some people also say the "waste" helps....so i guess it's not really a waste after all.

RotorMotorDriver

iTrader: (1)

Yeah, I knew that, but I thought that when we do direct fire on our cars, we have two leading coils like the FC or FD, but they dont fire at the same time like the FC or FD...But I guess they do. The whole point of going to direct fire on our cars is to replicate the ignition system on the FC or FD though too, so I guess it would work the same way after you convert it to direct fire, eh?

~T.J.

FD Racer

FCs and FDs have only one Leading coil. It has two outputs however... which always fire at the same time. But I'm sure thats what you meant.

I wonder if the ignitor will hold up okay to a 3rd gen coil?

FD Racer

BUMP!


I know there are some more comments out there....

Spieder

Here's what MSD told me. I didn't say I wanted to use a 3rd gen on a 1st gen. They'd say I need to use their blaster coils, or it won't be smog legal. I said I had a 3rd and 1st gen and wanted to outfit them. I am going to ask them a little differently and see if I can get another answer, more specific. I am not sure if the Digital is needed cause of the crank angle sensor or the coil. I think sensor. So a MSD 6a should fire the coil.

From MSD:

Dear Sir,

You may use the and MSD Digital 6 Plus P/N 6520 for the leading and a DIS-2 P/N 6211 for the two trailing coils, this would be on the 1994 Mazda. For the 1985 you may use two MSD 6A P/N 6200. If you need installation instructions we will be more than happy to send you some.

Thanks,
MSD tech