I notice that some of you run one.

I have a coil in cap Accel Blaster unit about 6 years aged. I am thinking I am getting a misfire without N20 at about 5500 rpms tryiny to achieve 6000. I believe spark related. My new install N20 at 75 HP jetting was way too rich10.0/1 so I rejetted adding N20 side but have not yet had a safe opportunity to run N20. Plugs 2 steps colder at .035.

Reccomendation on external coil? I assume it uses current coil wiring from my HEI(computer controlled).

 

I think I am running an Hypertech external coil, but cant remember. Its all black tho, and looks like the one in the summit racing picture.

Running stock 89 distributor and upgrade ignition module, new cap/rotor, and mallory hyfire VI ignition box.

My nitrous setup ran 2 steps colder plug, at .030-0.032 gap or so. Never had a problem spraying 150 hits to 6800 rpm.
No problems with 18 psi either.

 

Why is the ignition box necessary with an ECU controlling spark?

With an external coil does it wire up to leads formerly serving coil in cap?

 

MSD makes an external coil cap for the HEI, got one on my Buick.
MSD-8401

these 4 are good coils, only ones to pass Dave Rays spin test for reliable spark.
[he consults for many race teams]

NAPA IC12 NOT IC12SB
Black CarQuest 26189
Black MSD 8200 Blaster II
Chrome Summit G5215

you don't have to have a fancy box but its a good idea.

Buy summit brand if you can't afford MSD.

summit boxes are just mallory boxes with a different sticker.

 

The ignition box creates a hotter more powerful spark and can also rapid fire the plugs at lower rpms. The box has a lot of nice features especially for nitrous setups.

Its got a build in timing retard function that will pull timing only when spray is activated. Its got a window switch that will activate and deactivate the nitrous in a certain rpm window. This comes in handy if you dont want to spray right off the line and also when approaching rev limiter. You want the nitrous off before hitting the limiter so if you miss a shift, break the driveshaft, or something, the motor hits the limiter and doesnt have nitrous still spraying.

Its got startup retard stuff for easy starting and boost functions too but I dont use those on my turbo car.

Its also got a 2 step limiter for a T-brake or manual trans car, and also a main rev limiter for the motor. All nice features.

 

MY ECU has timing retard for N20 as well as MPH option and RPM option for "on" and "off". Multiple spark is possibly what i need at WOT even without spray. Maybe I go that route later.

So If I were to opt for not using a box right now can I utilize the Summit brand coil listed above and wire direct to my distributor after removing coil in cap?

 

yes you just need the external coil cap for the HEI.
Made by MSD not accel, brain fart




MSD-8401 HEI cap
SUM-G5215 coil

It replaces the stock cap that hides the internal coil and gives a place to plug the external coil into.

You can pick up a coil wire from autozone or other,
they got then in the back. don't have to get a whole new wire set if you don't want to.

 

You have no chance doing multiple spark above 2K RPM with one coil. There just isn't enough time. Convert to EDIS wasted spark or 8 COP in order to be able to do MSD at higher rpms. At max rpm you won't be doing MSD with any of those setups.

Most ign systems are limited by the module and coil. The stock external coil isn't that bad, but the in cap isn't that good. The module current limit makes it the first part you want to replace.

 

Yea I was aware of that. My goal is to get a better spark but maybe to do so I need multiple spark.

Does the ignition box then replace my Accel module? I will guess yes. Actually it was said that Accel is not any better than GM. So I presume I can get a base model ign box from MSD or Summit as I have some of the features already in my ECU? And then run the external coil with that coil cap. seems a few of you already went that route.

thanks to all...

 

Yes, the box does not use the module to trigger the coil. The box does use the module for the DRP to know when to fire the coil. If you go with an ignition box then get the coil that goes with it. I looked at boxes a few years ago and liked the Crane box and coil, but a lot has probably changed since then.

You have all the features you need in the ECM except for one. That is a rev limit controlled by dropping spark. That is the only way to properly rev limit boost and nitrous. Don't use the fuel cut rev limit you have in the ECM. Maybe your ECM has a spark cut rev limit but I am guessing that it doesn't since it is based on GM code.