How do you connect 3 accel boxes to one coil pack?

[norbs]

I was reading somewhere that professor Bruce is using 3 accel boxes to fire the dis? How is this connected i am interested in this if its cheaper than going to an e-dis system? Advantages, disadavantages? Whats the calculated spark output??????

 

[bruce]

I was reading somewhere that professor Bruce is using 3 accel boxes to fire the dis? How is this connected i am interested in this if its cheaper than going to an e-dis system? Advantages, disadavantages? Whats the calculated spark output??????

It depends on what sort of prices you can pick things up for.
The eDist is impossible to get any real deals on, from what I've seen, so you have ~$300 for it, then ~$125 for the coils, and a fair amount of wire/ terminals and harness making.
I found all three of the ACCEL 300s, on ebay for $175, and the MSD coil adapters, were $78. I'm running the Type II coils so I used the MSD 8870 adapter. If you're running the oem coils, then you'd want the 8878 adapter.

The CNP setup like the eDist uses, offers all the dwell time you could possibly need to saturate a conventional coil. So that gives a *high amperage* moderate HV output.
Using 3 of the ACCEL 300s, with one firing each coil, means that you have multispark up to well past redline. Couple that with the fast rise time of a CD, and you have about all the ignition you can get short of using some sort of Plasma setup.

The eDist does seem somehow *seems*slower then the oem setup, in intial synching up so the cranking *seems* longer.

One advantage to the CDI setup, is that it's easy to bypass in the event of a failure compared to the eDist. I can simply remove the CDI? coil adapters and be back to stock in minutes, compared to what probably would take a couple hours with the eDist.

I don't know what the rated output voltage of joules of the CDI setup is, but I can tell you, it'll throw a blue spark well over an inch, with a plug tester.

With the eDist I was able to remove the side electrode, and run a .1" gap at 15 PSI of boost without an engine miss. BTW, if anyone tries running something like that, be sure to cut down your timing a few degrees because with an intial flame kernel that big, it gets things burning much quicker.

I quess next up, is CDI CNP.....

 

[norbs]

Thanks Bruce, but the 300+ box says it takes up to 1 amp/1000 rpm, that equates to to 18 amps at 6000 rpm, have tested/verified that? WHat is the amp draw on the stock coil/module setup?

 

[bruce]

Thanks Bruce, but the 300+ box says it takes up to 1 amp/1000 rpm, that equates to to 18 amps at 6000 rpm, have tested/verified that? WHat is the amp draw on the stock coil/module setup?

No, I haven't put an amp guage on them, I just have them wired up thur 10 Amp Fuses (one per CDI), to a devoted Bosch relay, that runs just the CDIs. Then, the module is wired as GM intented.

I don't know if a normal amp guage would even capture what's going on.

 

[norbs]

Is this system for sale. I am going crazy chasing an idle , misfire and i am on the 3rd module/coil pack??????????mind you they arre used

 

[bruce]

Is this system for sale. I am going crazy chasing an idle , misfire and i am on the 3rd module/coil pack??????????mind you they arre used

You mgiht try driving around to your local *instant tune* shops, and see if they have anyone that really can read a scope. The slope of the firing line will tell you if it's an internal engine problem, or external.

A leaking intake or exhaust valve can cause a slight miss, a leak down test should be able to pinpoint that.

Are you in the neighborhood of ~25d of ignitiong timing?.

Are you sure of your indicated AFR.

Do you have another ECM you can plug in?.

What do you mean by this system?.

 

[norbs]

Your accel 3 module system complete with the type ii ignition. I have a timing light hooked up and it miss'es on certain cylinders.

 

[norbs]

I have tested a type ii ignition and the miss is almost gone and the timing light doesnt skip a beat. I will be testing a new type 1 module soon and see what happens

 

[norbs]

Using 3 of the ACCEL 300s, with one firing each coil, means that you have multispark up to well past redline.
I

If you set the boxes to 4cyl setting you will have multispark until 3877 rpm then it will be a single spark. Am i correct?

 

[bruce]

If you set the boxes to 4cyl setting you will have multispark until 3877 rpm then it will be a single spark. Am i correct?

Years ago, when I was looking at it with a scope, they tapered off, rather then switching modes.
I'm not sure exactly what the cylinder select does.

Why would you want to limit the MS?.

 

[norbs]

I would think increased current would happen without the MS. The accel desgined the MS to switch to single spark at 2500 rpm there must be a reason?

 

[rob86gn]

I've also gone thru about 3 coils and 2 modules. The miss goes away (with new coil) until the car is hot, it seems, and then starts to miss. Once it starts to miss it will always miss until I replace the coil. Then the problem starts all over again. Runs good, get it hot, misses, etc...

 

[norbs]

I have two accel boxes already and just waiting on the third i will update you and tell you the difference how it runs. But from Bench testing the spark looks like day and night between the stock buick set up and the accel boxes.

 

[norbs]

Heres a spark from the accel 300+ box

 

[bruce]

I would think increased current would happen without the MS. The accel desgined the MS to switch to single spark at 2500 rpm there must be a reason?

Charge time for the main capacitor.

 

[bruce]

Heres a spark from the accel 300+ box

Attachment no workie.

Yes, with a conventional air gap, spark tester, at 1" it's a pretty blue arc....

 

[norbs]

Link says pending approval?

 

[norbs]

Bruce, i have a major problem, I have no room to mount the 3 accel boxes? Where did you mount yours?

 

[rob86gn]

I've been having problems with rough running, hesitation, and misfire after about 1/2hr of running. I've gone through a couple cheap coils and now I'm using a GM one and I'm starting to notice the same problems.

Do the Accel coils hold up any better?

 

[BoostKillsStres]

Norbs since Burce hasn't posted yet, I think he told me at one point he had a mess of electronics under the pass seat so that may be where he has them.
HTH