ignition kits for S4. good/bad?

ex. MSD...

 

Stock FC coils are one of the best, unless you are running ultra high power you don't need to upgrade them.

 

I've heard of n/a FCs having ignition breakup in higher RPMs, and using something like a Jacob's FC1000 can help. But the stock coils are fine.

 

stock coils are great, but an MSD box or similar offers a great improvement. fc3spro.com has a great write up.

 

is there any difference if i swap the NA with turbo II coils?

 

none.

 

so i read the fc3spro thing, If i used the msd 6a do i have to buy the coils? or i can just use the stock? sorry, im newbie!

 

I've used a single MSD 6A on the leading coil for years. Works great. Some people go nuts and use 3 boxes so they have the leadings and the trailings covered but I don't see any reason to do this. As others have said, the stock coils are awesome. I have never had high rpm breakup issues. Just buy a 6A and leave everything else as is stock coils and all. Only one thing to wire in.

 

What about putting a capacitor in line with the MSD?

I had never heard of this, but recently a friend of mine bought a weekend racer from and it had it on there. The guy who he bought the car from didnt know much about the car. He just had a lot of money and paid a shop to build the car so he could race it instead of his corvette.

The car isnt running right yet. It had been sitting for a couple years before my friend bought it. He said he tested the spark with a spark plug out of the engine sitting on the strut tower. He said you could hear the spark "snap" louder than he has heard one before.

Here is a picture of it mounted in the engine bay, I cirlced it in the top of the pic.

 

The coils are firing so often that I have no idea how a cap that large could possibly charge back up that fast.

 

I run one 6al on the leading and run another 6al on the trailing thru the cap. This way you can run a rev limiter. Works great. And the other day at the race track my clutch slave cylinder got stuck and my clutch pedal stayed on the floor when I launched at 10k rpm. If I didn't have the rev limiter, I probably would have blown my motor.