I am thinking about either of the CDI's but am wondering if the performance increase would be worth the extra cash. What do yall think?
Chris

 

The Copperhead makes degree keys obsolete. You can dial in any timing curve and as much advance as you like, and you get the benefits of MSD. You need the programmer to be able to customize the programs but in my opinion it is worth it.

 

But if I were to install either of the CDI's would I have to remove the key. This would not be a task I would want to do.

 

If you already have an off set key you would not need to remove it for the VDI. You would just adjust your map to correct for it. The VDI is way better than using an off set because you can get the exact curve you want. Off set keys advance the timing trough out the entire RPM range whether you want it or not.

 

What do you think, if you had a better power increase all thru the rpm band?

Dynatek igniters kick butt all thru the power band, if you get one that works, and the vdi igniter works a little better from what I hear.

Go for it - - - a cdi is what will make you roll tall! (Do you have a primary spring? Put those 2 mods on one at a time, you will feel both about the same in the seat of your pants). My $0.02. Experience talking on these mods.

 

Curls is right about the Copperhead. If you already have a key and you want 7 deg advance, you would just add 3 deg to the 4 deg you already have. You need the programmer (and a PC with a USB port) to do it.

In response to the timing advance across the entire rpm band, a key is going to add advance from 0 rpm to redline. This can make it hard to start as you add more key advance. At about 11 degrees it probably won't start at all. With the Copperhead you can keep the starting advance at the factory 5 deg and start pouring on the advance so that you are at 11 degrees at 2500 rpms (or whatever).

The Copperhead has some built in safety features to protect your engine, but beyond that you can program it any way you like.