I just swapped this week from the IV to the EST. The Thunderbolt IV parts are obsolete and I had an Amplifier go bad....you can take your chances on ebay and thats about it.

The EST is much less wiring and is a simple install. Swapped out and timed in less than an hour. I got mine from Michigan Motorz and the boat is starting better than it ever did with the Thunderbolt.

I really appreciate the simplicity of my DUI ignition, but it is very basic and does use centrifugal weights. I'm mostly in fresh water so it's no big deal but MT's concern is valid. I'm on on the opposite side of opinion and appreciate mechanical gizmos because I have no patience for ghostly electronics.

It still uses a magnetic pickup and electronic module.

Put something electronic in my hands and it's guaranteed to go wrong or malfunction in some way or another. I can walk in a room and set off or activate alarms or walk in any yard and sprinklers turn on.

I have a Delco Voyager distributor from about 1998 from a MEF1 fi setup, it looks to be the same as the EST. If so, what do I need to do to make it work on a carbed application? How do I wire the weatherproof connectors? thanks

Thunderbolt IV doesn't use a rev limiter. I'm going to run an MSD rev limiter on my setup. They only run around $140, and unlike an MSD ignition box, I've never really heard anyone having issues with them.

Ha- guess I need to look at my own notes!

It is the EST. Schweet huh ? No ignition system to buy when swapping to carb.

Keep and connect the two wire harness that goes from coil to distributor.

The other two wire harness that goes to other connector on your coil is the ign + lead and the other is your tach.lead.

The bigger connector with wires that plug into right side of distributor is not needed. If you have an alpha drive , these use a shift interuptor, and can be wired to one of those wires...I'd have to look that up as I forget which one.

That's it . Simple.

I do this all the time ! Way too many notes.

i ran locked timing on supercharged engines tor years,boats&cars.after seeing the benefits of the daytona marine cd1 ignition i sold all my msd boxes&coils and went with the daytona setup.i have not run the boat yet but it will be done soon.i installed the daytona setup on my buddy,s 42 fountain with 1000,s and i am pleased with the results.imo the daytona cd1 is the way to go on a supercharged marine engine.i have a procharged 565 that also has the daytona setup and will be on the dyno thuesday.i am goung to run it with locked timing first them back to back with the daytona with a 3d map.if anyone is interested i will post the results.